KOOLAIRE KDP0250A 220" Ice Maker With Bin, Cube-Style

Part Number 000019553 Rev 00 04/26

K, KF & KP Models

UnderCounter Ice Machines

Technician’s Handbook

Part Number 000019553 Rev 00 4/26 UnderCounter - 3

Safety Notices

Read these precautions to prevent personal injury:

• Read this manual thoroughly before operating,

installing or performing maintenance on the

equipment. Failure to follow instructions in this

manual can cause property damage, injury or death.

• Routine adjustments and maintenance procedures

outlined in this manual are not covered by the

warranty.

• Proper installation, care and maintenance are essential

for maximum performance and trouble-free operation

of your equipment.

• Visit our website www.kool-aire.com for manual

updates, translations, or contact information for

service agents in your area.

• This equipment contains high voltage electricity and

refrigerant charge. Installation and repairs are to be

performed by properly trained technicians aware of

the dangers of dealing with high voltage electricity

and refrigerant under pressure. The technician

must also be certified in proper refrigerant handling

and servicing procedures. All lockout and tag out

procedures must be followed when working on this

equipment.

• This equipment is intended for indoor use only. Do not

install or operate this equipment in outdoor areas.

• As you work on this equipment, be sure to pay close

attention to the safety notices in this handbook.

Disregarding the notices may lead to serious injury

and/or damage to the equipment.

4 - UnderCounter Part Number 000019553 Rev 00 4/26

Definitions

DANGER

Indicates a hazardous situation that, if not avoided, will

result in death or serious injury. This applies to the most

extreme situations.

Warning

Indicates a hazardous situation that, if not avoided,

could result in death or serious injury.

Caution

Indicates a hazardous situation that, if not avoided,

could result in minor or moderate injury.

Notice

Indicates information considered important, but not

hazard-related (e.g. messages relating to property

damage)

NOTE: Indicates useful, extra information about the

procedure you are performing.

We reserve the right to make product improvements at

any time. Specifications and design are subject to change

without notice.

Part Number 000019553 Rev 00 4/26 UnderCounter - 5

Warning

Follow these electrical requirements during installation

of this equipment.

• All field wiring must conform to all applicable

codes of the authority having jurisdiction. It is

the responsibility of the end user to provide the

disconnect means to satisfy local codes. Refer to

rating plate for proper voltage.

• This appliance must be grounded.

• This equipment must be positioned so that the plug

is accessible unless other means for disconnection

from the power supply (e.g., circuit breaker or

disconnect switch) is provided.

• Check all wiring connections, including factory

terminals, before operation. Connections can

become loose during shipment and installation.

DANGER

Do not operate equipment that has been misused,

abused, neglected, damaged, or altered/modified

from that of original manufactured specifications. This

appliance is not intended for use by persons (including

children) with reduced physical, sensory or mental

capabilities, or lack of experience and knowledge,

unless they have been given supervision concerning

use of the appliance by a person responsible for their

safety. Do not allow children to play with, clean or

maintain this appliance without proper supervision.

6 - UnderCounter Part Number 000019553 Rev 00 4/26

Warning

Follow these precautions to prevent personal injury

during installation of this equipment:

• Installation must comply with all applicable

equipment fire and health codes with the authority

having jurisdiction.

• To avoid instability the installation area must be

capable of supporting the combined weight of the

equipment and product. Additionally the equipment

must be level side to side and front to back.

• Remove all removable panels before lifting and

installing and use appropriate safety equipment

during installation and servicing. Two or more

people are required to lift or move this appliance to

prevent tipping and/or injury.

• Do not damage the refrigeration circuit when

installing, maintaining or servicing the unit.

• Connect to a potable water supply only.

• This equipment contains refrigerant charge.

Part Number 000019553 Rev 00 4/26 UnderCounter - 7

Warning

Follow these precautions to prevent personal injury

while operating or maintaining this equipment.

• Refer to nameplate to identify the type of refrigerant

in your equipment.

• Only trained and qualified personnel aware of the

dangers are allowed to work on the equipment.

• Read this manual thoroughly before operating,

installing or performing maintenance on the

equipment. Failure to follow instructions in this

manual can cause property damage, injury or death.

• Crush/Pinch Hazard. Keep hands clear of moving

components. Components can move without

warning unless power is disconnected and all

potential energy is removed.

• Moisture collecting on the floor will create a

slippery surface. Clean up any water on the floor

immediately to prevent a slip hazard.

• Never use sharp objects or tools to remove ice or

frost. Do not use mechanical devices or other means

to accelerate the defrosting process.

• When using cleaning fluids or chemicals, rubber

gloves and eye protection (and/or face shield) must

be worn.

• Objects placed or dropped in the bin can affect

human health and safety. Locate and remove any

objects immediately.

8 - UnderCounter Part Number 000019553 Rev 00 4/26

DANGER

Follow these precautions to prevent personal injury

during use and maintenance of this equipment:

• It is the responsibility of the equipment owner to

perform a Personal Protective Equipment Hazard

Assessment to ensure adequate protection during

maintenance procedures.

• Do Not Store Or Use Gasoline Or Other Flammable

Vapors Or Liquids In The Vicinity Of This Or Any Other

Appliance. Never use flammable oil soaked cloths or

combustible cleaning solutions for cleaning.

• All covers and access panels must be in place and

properly secured when operating this equipment.

• Risk of fire/shock. All minimum clearances must be

maintained. Do not obstruct vents or openings.

• Failure to disconnect power at the main power supply

disconnect could result in serious injury or death.

The power switch DOES NOT disconnect all incoming

power.

• All utility connections and fixtures must be maintained

in accordance with the authority having jurisdiction.

• Turn off and lockout all utilities (gas, electric, water)

according to approved practices during maintenance

or servicing.

• Do not store or use electrical appliances inside the ice

machine or ice storage areas.

Part Number 000019553 Rev 00 4/26 UnderCounter - 9

DANGER

Follow these flammable refrigeration system

requirements during installation, use or repair of this

equipment:

• Refer to nameplate - Ice machine models may

contain up to 500 grams of R290 (propane)

refrigerant. R290 (propane)is flammable in

concentrations of air between approximately 2.1%

and 9.5% by volume (LEL lower explosion limit and

UEL upper explosion limit). An ignition source at

a temperature higher than 470°C is needed for a

combustion to occur. Refer to nameplate to identify

the type of refrigerant in your equipment.

• To minimize the risk of ignition due to improper

installation, replacement parts or service

procedures, only refrigeration technicians with

flammable refrigerant training who are aware of the

dangers of dealing with high voltage electricity and

refrigerant under pressure are allowed to work on

this equipment.

• All replacement parts must be like components

obtained from the equipment manufacturers

authorized replacement part network.

• This equipment must be installed in accordance with

the ASHRAE 15 Safety Standard for Refrigeration

Systems.

• This equipment can not be installed in corridors or

hallways of public buildings.

• Installation must comply with all applicable

equipment fire and health codes with the authority

having jurisdiction.

10 - UnderCounter Part Number 000019553 Rev 00 4/26

DANGER

Follow these flammable refrigeration system

requirements during installation, use or repair of this

equipment:

• Minimum room size may be required; refer to ice

machine label.

• Multiple R290 units can be installed in a single room

but their cumulative refrigerant charge must be

considered when determining safe room size.

• All lockout and tag out procedures must be followed

when working on this equipment.

• This equipment contains high voltage electricity

and refrigerant charge. Shorting electrical wires to

refrigeration tubing may result in an explosion. All

electrical power must be disconnected from the

system before servicing the system. Refrigerant

leaks, can result in serious injury or death from

explosion, fire, or contact with refrigerant or

lubricant mists.

• Do not damage the refrigeration circuit when

installing, maintaining or servicing the unit. Never

use sharp objects or tools to remove ice or frost.

Do not use mechanical devices or other means to

accelerate the defrosting process.

• Well-ventilated areas are recommended for

installation and storage.

• Leak pressure, leak hole size, wind speed, and the

presence of objects like furniture within the room

can also affect the concentration and distribution of

R290 during a leak.

Part Number 000019553 Rev 00 4/26 UnderCounter - 11

DANGER

Follow these precautions to prevent personal injury

during use and maintenance of this equipment:

• Units with two power cords must be plugged

into individual branch circuits. During movement,

cleaning or repair it is necessary to unplug both

power cords.

• Never use a high-pressure water jet for cleaning

on the interior or exterior of this unit. Do not use

power cleaning equipment, steel wool, scrapers or

wire brushes on stainless steel or painted surfaces.

• Two or more people are required to move this

equipment to prevent tipping.

• Locking the front casters after moving is the

owner’s and operator’s responsibility. When casters

are installed, the mass of this unit will allow it to

move uncontrolled on an inclined surface. These

units must be tethered/secured to comply with all

applicable codes.

• The on-site supervisor is responsible for ensuring

that operators are made aware of the inherent

dangers of operating this equipment.

• Do not operate any appliance with a damaged cord

or plug. All repairs must be performed by a qualified

service company.

12 - UnderCounter Part Number 000019553 Rev 00 4/26

THIS PAGE INTENTIONALLY LEFT BLANK

Part Number 000019553 Rev 00 04/26 UnderCounter - 13

Table of Contents - UnderCounter

Safety Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

General Information

Model Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

How to Read a Model Number . . . . . . . . . . . . . . . .18

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Ice Machine Warranty Information . . . . . . . . . . . .19

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Warranty Registration . . . . . . . . . . . . . . . . . . . . . . .19

Installation

Location of Ice Machine . . . . . . . . . . . . . . . . . . . . . .21

Ice Machine Clearance Requirements . . . . . . . . . .22

Ice Machine Heat of Rejection . . . . . . . . . . . . . . . .22

Leveling the Ice Machine . . . . . . . . . . . . . . . . . . . . .23

Electrical Requirements . . . . . . . . . . . . . . . . . . . . . .24

Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Fuse/Circuit Breaker . . . . . . . . . . . . . . . . . . . . .24

Total Circuit Ampacity . . . . . . . . . . . . . . . . . . . .24

Electrical Specifications . . . . . . . . . . . . . . . . . . . . . .25

Air-cooled Ice Machine . . . . . . . . . . . . . . . . . . .25

Water-cooled Ice Machines . . . . . . . . . . . . . . .25

Water Service/Drains . . . . . . . . . . . . . . . . . . . . . . . .26

Water Supply . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Water Inlet Lines . . . . . . . . . . . . . . . . . . . . . . . .26

Drain Connections. . . . . . . . . . . . . . . . . . . . . . .26

Water Supply and Drain Line Sizing/

Connections . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Cooling Tower Applications . . . . . . . . . . . . . . .28

Maintenance

Interior De-scaling and Sanitizing . . . . . . . . . .44

Ice Machine Inspection. . . . . . . . . . . . . . . . . . .57

Exterior Cleaning . . . . . . . . . . . . . . . . . . . . . . . .57

Cleaning the Condenser . . . . . . . . . . . . . . . . . .57

Removal from Service/Winterization. . . . . . . .59

14 - UnderCounter Part Number 000019553 Rev 00 04/26

Operation

KP Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61

K & KF Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74

Operational Checks

KP Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72

K & KF Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77

Troubleshooting

KP Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81

Symptom #1 . . . . . . . . . . . . . . . . . . . . . . . . . . .86

Symptom #2 - Refrigeration Chart . . . . . . . . . .91

Symptom #3. . . . . . . . . . . . . . . . . . . . . . . . . . .119

Symptom #4 . . . . . . . . . . . . . . . . . . . . . . . . . .121

K & KF Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . .126

Symptom #1 . . . . . . . . . . . . . . . . . . . . . . . . . .135

Symptom #2 - Refrigeration Chart . . . . . . . . .139

Symptom #3. . . . . . . . . . . . . . . . . . . . . . . . . . .169

Symptom #4 . . . . . . . . . . . . . . . . . . . . . . . . . .171

Component Check Procedures

Main Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .173

Touch Pad. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .174

KP0150/KP0250. . . . . . . . . . . . . . . . . . . . . . . .174

Bin Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .180

K & KF Models . . . . . . . . . . . . . . . . . . . . . . . . .180

ON/OFF/WASH Toggle Switch . . . . . . . . . . . . . . . .183

K & KF Models . . . . . . . . . . . . . . . . . . . . . . . . .183

Ice Thickness Probe . . . . . . . . . . . . . . . . . . . . . . . .184

K & KF Models . . . . . . . . . . . . . . . . . . . . . . . . .184

Diagnosing Start Components. . . . . . . . . . . . . . . .186

Compressor Electrical Diagnostics . . . . . . . . . . . .187

Fan Cycle Control. . . . . . . . . . . . . . . . . . . . . . . . . . .189

High Pressure Cutout (HPCO) Control. . . . . . . . . .190

Filter-Driers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .191

Refrigerant Recovery/Evacuation . . . . . . . . . . . . .192

Refrigerant Re-use Policy . . . . . . . . . . . . . . . .193

Recovery and Recharging Procedures . . . . .195

System Contamination Cleanup . . . . . . . . . . . . . .198

KF0250/K0270 Condenser Fan Motor Access . . .205

art Number 000019553 Rev 00 04/26 UnderCounter - 15

Component Specifications

Main Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .207

Bin Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .207

ON/OFF/WASH Toggle Switch . . . . . . . . . . . . . . . .207

Fan Control Cycle. . . . . . . . . . . . . . . . . . . . . . . . . . .207

High Pressure Cutout (HPCO) Control. . . . . . . . . .207

Total System Refrigerant Charge . . . . . . . . . . . . . .208

R404A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .208

R290 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .208

Charts

Cycle Times, 24 Hr. Ice Production and Refrigerant

Pressure Charts . . . . . . . . . . . . . . . . . . . . . . . . . . . .209

KF0150A Self-contained Air-Cooled. . . . . . . .210

KP0150A Self-contained Air-Cooled. . . . . . . .212

K0170A Self-contained Air-cooled . . . . . . . . .214

KF0250A Self-contained Air-cooled . . . . . . . .216

KP0250A Self-contained Air-Cooled. . . . . . . .218

K0270A Self-contained Air-cooled . . . . . . . . .220

K0270W Self-contained Water-cooled . . . . .222

Diagrams

Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . .225

KF0150/K0170 Wiring Diagram . . . . . . . . . . .226

KF0250/K0270 Wiring Diagram . . . . . . . . . . .228

KP0150/KP0250 Wiring Diagram . . . . . . . . . .230

Electronic Control Board . . . . . . . . . . . . . . . . . . . .232

Tubing Schematic . . . . . . . . . . . . . . . . . . . . . . . . . .232

THIS PAGE INTENTIONALLY LEFT BLANK

Part Number 000019553 Rev 00 04/26 UnderCounter - 17

Model Numbers

This manual covers the following models:

Self-contained Air-cooled Self-contained Water-cooled

KDF0150A N/A

KYF0150A N/A

KDP0150A N/A

KYP0150A N/A

KD0172A N/A

KY0174A N/A

KDF0250A N/A

KYF0250A N/A

KDP0250A N/A

KYP0250A N/A

KR0270A KR0271W

KD0272A KD0273W

KY0274A KY0275W

Warning

An ice machine contains high voltage electricity and

refrigerant charge. Repairs are to be performed by

properly trained refrigeration technicians aware of the

dangers of dealing with high voltage electricity and

refrigerant under pressure.

General Information

18 - UnderCounter Part Number 000019553 Rev 00 04/26

How to Read a Model Number

K D P 0150 A

Cube Size

A - Air-cooled

Series

Capacity

Condenser

Type

D - Dice

Y - Half-dice

P - R290 Refrigerant

F - R404A Refrigerant

Accessories

Contact your distributor for these optional accessories:

BIN CASTER

Replaces standard legs.

DESCALER AND SANITIZER

Manitowoc Ice Machine De-scaler and Sanitizer are

available in convenient 16 oz. (473 ml) and 1 gal (3.78 l)

bottles. These are the only cleaner and sanitizer approved

for use with Koolaire® products.

Cleaner Part Number Sanitizer Part Number

16 oz 9404563 16 oz 9405653

1 Gallon 9405803 1 Gallon 9405813

Part Number 000019553 Rev 00 04/26 UnderCounter - 19

Ice Machine Warranty Information

Warranty

For warranty information visit:

www.kool-aire.com/Service/Warranty

• Warranty Coverage Information

• Warranty Registration

• Warranty Verification

Warranty coverage begins the day the ice machine is

installed.

Warranty Registration

Completing the warranty registration process is a quick and

easy way to protect your investment.

Scan the QR code with your smart device or enter the link

in a web browser to complete your warranty registration.

www.kool-aire.com/Service/Warranty

Registering your product insures warranty coverage and

streamlines the process if any warranty work is required.

THIS PAGE INTENTIONALLY LEFT BLANK

Part Number 000019553 Rev 00 04/26 UnderCounter - 21

Location of Ice Machine

The location selected for the ice machine must meet the

following criteria. If any of these criteria are not met,

select another location.

• The location must be indoors.

• The location must be free of airborne and other

contaminants.

• Air temperature: Must be at least 40°F (4°C), do not

exceed 110°F (43.4°C).

• The location must not be near heat-generating

equipment or in direct sunlight.

• The location must be capable of supporting the weight

of the ice machine and a full bin of ice.

• The location must allow enough clearance for water,

drain, and electrical connections in the rear of the ice

machine.

• The location must not obstruct airflow through or

around the ice machine (condenser airflow is in and

out the front). Refer to the chart below for clearance

requirements.

• The ice machine must be protected if it will be

subjected to temperatures below 32°F (0°C). Failure

caused by exposure to freezing temperatures is not

covered by the warranty.

• The location must not be near garbage or other

contaminants.

• Minimum room size required, refer to ice machine

label.

• The ice machine must use legs or be sealed to the

floor. Before sealing to the floor, the rubber bumpers

on the bottom of the ice machine must be removed.

Installation

22 - UnderCounter Part Number 000019553 Rev 00 04/26

Ice Machine Clearance Requirements

Self-contained

Air-cooled

Top/Sides 5" (127 mm)*

Back 5" (127 mm)*

*NOTE: The ice machine may be built into a cabinet.

There is no minimum clearance requirement for the top or

left and right sides of the ice machine. The listed values are

recommended for efficient operation and servicing only.

Ice Machine Heat of Rejection

Series

Ice Machine

Heat of Rejection*

Air Conditioning** Peak

KF0150 2200 2600

KP0150 2400 2900

K0170 2200 2600

KF0250 3800 6000

KP0250 2800 3300

K0270 3800 6000

* B.T.U./Hour

** Because the heat of rejection varies during the ice making

cycle, the figure shown is an average.

Ice machines, like other refrigeration equipment, reject

heat through the condenser. It is helpful to know the

amount of heat rejected by the ice machine when sizing air

conditioning equipment where self-contained air-cooled

ice machines are installed.

Part Number 000019553 Rev 00 04/26 UnderCounter - 23

Leveling the Ice Machine

1. Screw the leveling legs onto the bottom of the ice

machine.

2. Screw the foot of each leg in as far as possible.

Caution

The legs must be screwed in tightly to prevent them

from bending.

3. Move the ice machine into its final position.

4. Level the ice machine to ensure that the siphon

system functions correctly. Use a level on top of the

ice machine. Turn each foot as necessary to level the

ice machine from front to back and side to side.

NOTE: An optional 2-1/2" (6.35 cm) caster assembly

is available for use in place of the legs. Installation

instructions are supplied with the casters.

THREAD

LEVELING LEG

INTO BASE OF

CABINET

THREAD “FOOT”

IN AS FAR AS

POSSIBLE

Leg Installation

24 - UnderCounter Part Number 000019553 Rev 00 04/26

Electrical Requirements

VOLTAGE

The maximum allowable voltage variation is ±10% of the

rated voltage on the ice machine model/serial number

plate at start-up (when the electrical load is highest).

The 115/1/60 ice machines are factory pre-wired with a 6'

(1.8 m) power cord, and NEMA 5-15P-plug configuration.

The 208-230/1/60 and 230/1/50 ice machines are factory

pre-wired with a power cord only, no plug is supplied.

FUSE/CIRCUIT BREAKER

A separate fuse/circuit breaker must be provided for each

ice machine. Circuit breakers must be H.A.C.R. rated (does

not apply in Canada).

TOTAL CIRCUIT AMPACITY

The total circuit ampacity is used to help select the wire

size of the electrical supply.

The wire size (or gauge) is also dependent upon location,

materials used, length of run, etc., so it must be

determined by a qualified electrician.

Part Number 000019553 Rev 00 04/26 UnderCounter - 25

Electrical Specifications

AIRCOOLED ICE MACHINE

Ice Machine

Voltage Phase

Cycle

Max. Fuse/

Circuit Breaker

Total

Amps

KF0150 115/60/1 15 amp 7.4

KP0150 115/60/1 15 amp 5.0

K0170

115/1/60 15 amp 7.0

208/1/60 15 amp 3.5

230/1/50 15 amp 4.0

KF0250 115/60/1 15 amp 11.8

KP0250 115/60/1 15 amp 7.0

K0270

115/1/60 15 amp 10.7

208-230/1/60 15 amp 5.2

230/1/50 15 amp 5.2

Warning

All wiring must conform to local, state and national

codes.

Warning

The ice machine must be grounded in accordance with

national and local electrical code.

WATERCOOLED ICE MACHINES

Ice Machine

Voltage

Phase Cycle

Max. Fuse/

Circuit Breaker

Total

Amps

K0170

115/1/60 15 amp 6.3

208/1/60 15 amp 3.6

230/1/50 15 amp 4.0

K0270

115/1/60 15 amp 9.9

208-230/1/60 15 amp 4.7

230/1/50 15 amp 4.7

26 - UnderCounter Part Number 000019553 Rev 00 04/26

Water Service/Drains

WATER SUPPLY

Local water conditions may require treatment of the water

to inhibit scale formation, filter sediment, and remove

chlorine odor and taste.

Important

If you are installing a water filter system, refer to the

Installation Instructions supplied with the filter system

for ice making water inlet connections.

WATER INLET LINES

Follow these guidelines to install water inlet lines:

• Do not connect the ice machine to a hot water supply.

Be sure all hot water restrictors installed for other

equipment are working. (Check valves on sink faucets,

dishwashers, etc.)

• If water pressure exceeds the maximum recommended

pressure, 80 psig (5.5 bar) obtain a water pressure

regulator from your distributor.

• Install a water shut-off valve for ice making potable

water.

• Insulate water inlet lines to prevent condensation.

DRAIN CONNECTIONS

Follow these guidelines when installing drain lines to

prevent drain water from flowing back into the ice

machine and storage bin:

• Drain lines must have a 1.5-inch drop per 5 feet of run

(2.5 cm per meter), and must not create traps.

• The floor drain must be large enough to accommodate

drainage from all drains.

• Run separate bin and ice machine drain lines. Insulate

them to prevent condensation.

• Vent the bin and ice machine drain to the atmosphere.

Part Number 000019553 Rev 00 04/26 UnderCounter - 27

WATER SUPPLY AND DRAIN LINE SIZING/

CONNECTIONS

Location

Water

Temperature

Water

Pressure

Ice Machine Fitting

Tubing Size Up to Ice

Machine Fitting

Ice Making

Water Inlet

40°F (4°C) min. 90°F

(32.2°C) max.

20 psi (1.38 bar) min.

80 psi (5.5 bar) max.

3/8" Female Pipe

Thread

3/8" (9.5 mm) min.

inside diameter

Condenser

Water Inlet

33°F (0.6°C) min. 90°F

(32.2°C) max.

20 psi (1.38 bar) min.

150 psi (10.3 bar) max.

3/8" Female Pipe Thread

3/8" (9.5 mm) min.

inside diameter

Condenser

Water Drain

—

1/2" Female Pipe

Thread

1/2" (12.7 mm) min.

inside diameter

Bin Drain

—

1/2" Female Pipe Thread

1/2" (12.7 mm) min.

inside diameter

28 - UnderCounter Part Number 000019553 Rev 00 04/26

COOLING TOWER APPLICATIONS

Water Cooled Models Only

A water-cooling tower installation does not require

modification of the ice machine. The water regulator valve

for the condenser continues to control the refrigeration

discharge pressure.

It is necessary to know the amount of heat rejected, and

the pressure drop through the condenser and water valves

(inlet to outlet) when using a cooling tower on an ice

machine.

• Water entering the condenser must not exceed 90°F

(32.2°C).

• Water flow through the condenser must not exceed

5 gallons (19 liters) per minute.

• Allow for a pressure drop of 7 psig (0.48 bar) between

the condenser water inlet and the outlet of the ice

machine.

• Water exiting the condenser must not exceed 110°F

(43.3°C).

Caution

Plumbing must conform to state and local codes.

Part Number 000019553 Rev 00 04/26 UnderCounter - 29

Interior De-scaling and Sanitizing

General

De-scale and sanitize the ice machine every six months

for efficient operation. If the ice machine requires more

frequent de-scaling and sanitizing, consult a qualified

service company to test the water quality and recommend

appropriate water treatment.

The ice machine must be taken apart for de-scaling and

sanitizing.

Sanitizing for Exterior, Remedial, and Detailed procedures

can be performed independently and more frequently

than de-scaling when needed

Caution

Use only Manitowoc approved Ice Machine De-scaler

(9405463) and Sanitizer (9405653). It is a violation

of Federal law to use these solutions in a manner

inconsistent with their labeling. Read and understand

all labels printed on bottles before use.

Detailed De-scaling and Sanitizing Procedure

KP0150 & KP0250

Ice machine de-scaler is used to remove lime scale and

mineral deposits. Ice machine sanitizer disinfects and

removes algae and slime.

NOTE: KP Models start on the following page

K and KF Models start on page 44

Maintenance

30 - UnderCounter Part Number 000019553 Rev 00 04/26

Touch Pad Operation

Pressing and holding the clean button for 3 seconds starts

the cycle. The Clean & On/Off lights energize indicating the

cycle has started and ice making will automatically start

when the cycle is complete.

• Setting the ice machine to stop after the cycle: Press

the On/Off button. The On/Off light will de-energize

indicating the ice machine will stop after the cycle.

• Pausing the cycle: Press the Clean button. The clean

light will flash indicating the cycle has paused. Pressing

the Clean button again will restart the cycle.

Step 1 Press the On/Off button after ice falls from the

evaporator at the end of a Harvest cycle. Or, press the On/

Off button and allow the ice to melt off the evaporator.

Caution

Never use anything to force ice from the evaporator.

Damage may result.

Step 2 Remove all ice from the bin.

Warning

Wear rubber gloves and safety goggles (and/or face

shield) when handling Ice Machine De-scaler or

Sanitizer.

Part Number 000019553 Rev 00 04/26 UnderCounter - 31

Caution

Do not mix Ice Machine De-scaler and Sanitizer

solutions together. It is a violation of Federal law to

use these solutions in a manner inconsistent with their

labeling.

Step 3 To start a de-scaling cycle, select Clean. Water

will flow through the water dump valve and down the

drain. Wait until the water trough refills, then add the

proper amount of ice machine de-scaler to the water

trough.

Model Amount of De-scaler

Part Number 9405463

KP0150 2 ounces (60 ml)

KP0250 5 ounces (150 ml)

Wait until the cycle is complete (approximately 22

minutes) then press the On/Off button and disconnect

power and water supplies to the ice machine.

Step 4 Remove parts for de-scaling.

Refer to the proper parts removal for your machine.

Continue with step 5 when the parts have been removed.

32 - UnderCounter Part Number 000019553 Rev 00 04/26

Step 5 Mix a solution of de-scaler and warm water.

Depending on the amount of mineral buildup, a larger

quantity of solution may be required. Use the ratio in the

table below to mix enough solution to thoroughly de-scale

all parts.

Solution Type Water Mixed with

De-scaler 1 gal. (4 l) 16 oz (500 ml)

De-scaler

part number 9405463

Caution

Do not immerse electrical connectors or motors for any

components in water, de-scaler or sanitizer solutions.

Use half of the de-scaler and water solution to de-scale all

components. The solution will foam when it contacts lime

scale and mineral deposits; once the foaming stops use

a soft bristle brush, sponge or cloth (not a wire brush) to

carefully de-scale the parts. Soak the parts for 5 minutes

(15 – 20 minutes for heavily scaled parts). Rinse all

components with clean water.

Step 6 While components are soaking, use half of

the de-scaler and water solution to de-scale all foodzone

surfaces of the ice machine and bin. Use a nylon brush

or cloth to thoroughly de-scale the following ice machine

areas:

• Evaporator plastic parts – including top, bottom and

sides

• Bin bottom, sides and top

• Rinse all areas thoroughly with clean water.

Part Number 000019553 Rev 00 04/26 UnderCounter - 33

Step 7 Mix a solution of sanitizer and warm water.

Solution Type Water Mixed With

Sanitizer 3 gal. (12 l) 2 oz (60 ml) sanitizer

part number 9405653

Use half of the sanitizer/water solution to sanitize all

removed components. Use a spray bottle to liberally apply

the solution to all surfaces of the removed parts or soak

the removed parts in the sanitizer/water solution. Do not

rinse parts after sanitizing.

Step 8 Use half of the sanitizer/water solution to

sanitize all foodzone surfaces of the ice machine and bin.

Use a spray bottle to liberally apply the solution. When

sanitizing, pay particular attention to the following areas:

• Evaporator plastic parts - including top, bottom and

sides

• Bin bottom, sides and top

Do not rinse the sanitized areas.

Step 9 Replace all removed components, wait 10

minutes, then reapply power and water to the ice machine

Step 10 Select Clean. Water will flow through the water

dump valve and down the drain. Wait until the water

trough refills, then add the proper amount of ice machine

sanitizer to the water trough.

Model Amount of Sanitizer

Part Number 9405653

KP0150 1 ounces (30 ml)

KP0250 2 ounces (60 ml)

Wait until the sanitize cycle is complete (approximately 22

minutes) then press the Ice button to start ice making.

34 - UnderCounter Part Number 000019553 Rev 00 04/26

Remove Parts for De-scaling

Warning

Disconnect electric power to the ice machine at the

electric switch box before proceeding.

1. Remove the Harvest Float Switch and Ice Thickness

Float Switch

• Pull forward on the bottom of the bracket until

clear of the tab, then slide bracket upward to

remove the bracket and float as an assembly. At

this point, the float switches can easily be de-

scaled. If complete removal is desired, follow the

wires to the bulkhead grommet (exit point) in the

back wall. Pull the wire connector through the

bulkhead grommet, then disconnect the wire leads

from the connector.

NOTE: The wire from the top grommet goes to the ice

thickness float switch (front switch). The wire from the

bottom grommet goes to the Harvest float switch (side

switch).

Important

Reversing the mounting location of the ice thickness and

the harvest floats will result in a safety limit 2 failure.

• Do not disassemble float for de-scaling - Incorrect

reassembly will result in an ice machine that will not

harvest.

• The ice thickness float must be mounted to the front

of the water trough and the electrical connection must

be in the top bulkhead grommet.

• The harvest float must be mounted to the side of the

water trough and the electrical connection must be in

the bottom bulkhead grommet.

• The wire connectors for each float are different and

will not allow incorrect electrical bulkhead connection.

Part Number 000019553 Rev 00 04/26 UnderCounter - 35

WIRE CONNECTORS ARE LOCATED BEHIND BULKHEAD

PULL THROUGH GROMMET TO DISCONNECT

Harvest FLOAT

SWITCH & BRACKET

ICE THICKNESS FLOAT

SWITCH & BRACKET

DISCONNECT WIRES

FOR COMPLETE

REMOVAL

Caution

Do not disassemble float for de-scaling - Incorrect

reassembly will result in an ice machine that will not

harvest.

36 - UnderCounter Part Number 000019553 Rev 00 04/26

2. Remove the Water Trough Thermistor and Water

Trough

• Remove the upper thumbscrew.

• While supporting the water trough remove the

thumbscrew and thermistor.

• While supporting the water trough remove the

lower thumbscrew from beneath the water

trough.

• Remove the water trough from the bin area.

UPPER THUMBSCREW LOWER THUMBSCREW

Part Number 000019553 Rev 00 04/26 UnderCounter - 37

3. Remove the Ice Damper

• Remove thumbscrew from bin switch cover.

• Support ice damper and then pull bin switch cover

and ice damper forward to remove.

1. REMOVE THUMBSCREW

2. SUPPORT ICE DAMPER THEN

SLIDE RIGHT SIDE FORWARD TO REMOVE

38 - UnderCounter Part Number 000019553 Rev 00 04/26

4. Remove the Water Distribution Tube

• Distribution tube thumbscrews are retained to

prevent loss. Loosen thumbscrews but do not pull

thumbscrews out of distribution tube.

• Loosen the two outer screws and pull forward on

the distribution tube to release.

NOTE: For ease of assembly when reinstalling the water

distribution tube, install the top edge first.

1. LOOSEN THUMBSCREWS

2. PULL DISTRIBUTION TUBE

FORWARD TO REMOVE

Part Number 000019553 Rev 00 04/26 UnderCounter - 39

REMEDIAL DESCALING

This procedure can be performed between the bi-annual

detailed de-scaling and sanitizing cycles. This procedure

does not require removing the ice from the bin.

Step 1 Press the On/Off button after ice falls from the

evaporator at the end of a Harvest cycle. Or, press the On/

Off button and allow the ice to melt off the evaporator.

Caution

Never use anything to force ice from the evaporator.

Damage may result.

Warning

Wear rubber gloves and safety goggles (and/or face

shield) when handling Ice Machine De-scaler or

Sanitizer.

Step 2 To start a cycle, press the Clean button. Water

will flow through the water dump valve and down the

drain. Wait until the water trough refills, then add the

proper amount of ice machine de-scaler to the water

trough.

Model Amount of De-scaler

Part Number 9405463

KP0150 2 ounce (60 ml)

KP0250 5 ounces (150 ml)

Wait until the cycle is complete (approximately 22

minutes) then press the On/Off button.

40 - UnderCounter Part Number 000019553 Rev 00 04/26

Ice Machine Inspection

Check all water fittings and lines for leaks. Also, make sure

the refrigeration tubing is not rubbing or vibrating against

other tubing, panels, etc.

Do not put anything (boxes, etc.) in front of the ice

machine. There must be adequate airflow through and

around the ice machine to maximize ice production and

ensure long component life.

Exterior Cleaning

Clean the area around the ice machine as often as

necessary to maintain cleanliness and efficient operation.

Sponge any dust and dirt off the outside of the ice machine

with mild soap and water. Wipe dry with a clean, soft

cloth.

Cleanup any fallen ice or water spills as they occur.

Part Number 000019553 Rev 00 04/26 UnderCounter - 41

CLEANING THE CONDENSER

General

Warning

Disconnect electric power to the ice machine head

section and the remote condensing unit at the electric

service switches before cleaning the condenser.

A dirty condenser restricts airflow, resulting in excessively

high operating temperatures. This reduces ice production

and shortens component life.

• Clean the condenser at least every six months.

Warning

The condenser fins are sharp. Use care when cleaning

them.

• Shine a flashlight through the condenser to check for

dirt between the fins.

• Blow compressed air or rinse with water from the

inside out (opposite direction of airflow).

NOTE: Cleaning the condenser will require the removal of

the bin on some models.

42 - UnderCounter Part Number 000019553 Rev 00 04/26

REMOVAL FROM SERVICE/WINTERIZATION

Self-contained Air-cooled ice machines

1. De-scale and sanitize the ice machine.

2. Press the On/Off button to turn off the ice machine.

3. Turn off the water supply, disconnect and drain the

incoming ice-making water line at the rear of the ice

machine and drain the water trough.

4. Energize the ice machine, wait one minute for the

water inlet valve to open and blow compressed air in

both the incoming water and the drain openings in

the rear of the ice machine to remove all water.

5. Press the On/Off button and disconnect the electric

power at the circuit breaker or the electric service

switch.

6. Fill spray bottle with sanitizer and spray all interior

food zone surfaces. Do not rinse and allow to air dry.

7. Replace all panels.

Water-cooled ice machines

1. Perform steps 1-6 under “Self-contained Air-cooled

Ice Machines”.

2. Disconnect the incoming water and drain lines from

the water-cooled condenser.

3. Insert a large screwdriver between the bottom spring

coils of the water regulating valve. Pry upward to

open the valve.

4. Hold the valve open and blow compressed air through

the condenser until no water remains.

Part Number 000019553 Rev 00 04/26 UnderCounter - 43

BIN REMOVAL

KP0150/KP0250

1. Disconnect power.

2. Remove all ice from bin.

3. Remove air filter and louver from lower front of

machine.

4. Loosen screws and rotate clips to release bin from

base.

5. Disconnect clamp and remove bin drain.

6. Remove control box panel.

7. Remove communication cable from control board.

8. Remove rear cover.

9. Slide bin forward to remove.

NOTE: When reinstalling the bin, ensure the bin seal

is in place and is not pinched/folded as it mates to the

cabinet. A watertight seal is required to prevent future

condensation or water leakage from entering the ice

machine base.

Disconnect communication

cable

DISCONNECT CLAMP

AND REMOVE BIN DRAIN

44 - UnderCounter Part Number 000019553 Rev 00 04/26

De-scaling and Sanitizing Procedure

K & KF Models

INTERIOR DESCALING AND SANITIZING

General

De-scale and sanitize the ice machine every six months

for efficient operation. If the ice machine requires more

frequent de-scaling and sanitizing, consult a qualified

service company to test the water quality and recommend

appropriate water treatment.

The ice machine must be taken apart for de-scaling and

sanitizing.

Caution

Use only Manitowoc Ice Machine De-scaler (part

number 9505463) and Sanitizer (part number

9405653). It is a violation of Federal law to use these

solutions in a manner inconsistent with their labeling.

Read and understand all labels printed on bottles

before use.

De-scaling and Sanitizing Procedure

Caution

Do not mix Ice Machine De-scaler and Sanitizer

solutions together. It is a violation of Federal law to

use these solutions in a manner inconsistent with their

labeling.

Warning

Wear rubber gloves and safety goggles (and/or face

shield) when handling Ice Machine De-scaler or

Sanitizer.

Ice machine de-scaler is used to remove lime scale and

mineral deposits. Ice machine sanitizer disinfects and

removes algae and slime.

Part Number 000019553 Rev 00 04/26 UnderCounter - 45

Step 1 Set the toggle switch to the OFF position after

ice falls from the evaporator at the end of a Harvest cycle.

Or, set the switch to the OFF position and allow the ice to

melt off the evaporator.

Caution

Never use anything to force ice from the evaporator.

Damage may result.

Step 2 Remove all ice from the bin.

Step 3 To start a cleaning cycle, move the toggle switch

to the WASH position.

Step 4 Add the proper amount of Ice Machine

De-scaler to the water trough.

Model Amount of De-scaler

KF0150 K0170 2 ounces (60 ml)

KF0250 K0270 2 ounces (60 ml)

Step 5 Wait until the clean cycle is complete

(approximately 22 minutes) then place the toggle switch in

the OFF position, disconnect power and water supplies to

the ice machine.

Warning

Disconnect electric power to the ice machine at the

electric switch box before proceeding.

46 - UnderCounter Part Number 000019553 Rev 00 04/26

Step 6 Remove parts for de-scaling.

A. Remove Two Thumbscrews and Water Pump

Cover (When Used).

B. Remove the Vinyl Hose Connecting the Water

Pump and Water Distribution Tube

C. Remove Water Pump

• Disconnect the water pump power cord

• Loosen the screws securing the pump-

mounting bracket to the bulkhead

• Lift the pump and bracket assembly off the

mounting screws.

WHEN USED - REMOVE

THUMBSCREWS AND

WATER PUMP COVER

DO NOT SOAK WATER

PUMP MOTOR IN

DE-SCALER OR SANITIZER

SOLUTION

Water Pump Removal

Part Number 000019553 Rev 00 04/26 UnderCounter - 47

D. Remove the Ice Thickness Probe

• Compress the side of the ice thickness probe

near the top hinge pin and remove it from

the bracket.

COMPRESS SIDES OF ICE

THICKNESS PROBE

ICE

THICKNESS

PROBE

SV1138A

Ice Thickness Probe Removal

NOTE: At this point, the ice thickness probe can easily be

de-scaled. If complete removal is desired, follow the ice

thickness probe wire to the bulkhead grommet (exit point)

in the back wall. Pop the bulkhead grommet out of the

back wall by inserting fingernails or a flat object between

the back wall and the grommet and prying forward.

Pull the bulkhead grommet and wire forward until the

connector is accessible, then disconnect the wire lead from

the connector.

Ice Thickness Probe De-scaling

• Mix a solution of ice machine de-scaler and water

(2 ounces of de-scaler to 16 ounces of water) in a

container.

• Soak the ice thickness probe a minimum of 10

minutes.

De-scale all ice thickness probe surfaces and verify the ice

thickness probe cavity is clean. Rinse thoroughly with clean

water, then dry completely. Incomplete rinsing and drying

of the ice thickness probe can cause premature harvest.

48 - UnderCounter Part Number 000019553 Rev 00 04/26

E. Remove the Water Distribution Tube

1. LIFT UP

2. SLIDE BACK

3. SLIDE TO RIGHT

THUMBSCREW

DISTRIBUTION

TUBE

SV1630

Water Distribution Tube Removal

• Loosen the two thumbscrews, which secure

the distribution tube.

• Lift the right side of the distribution tube up

off the locating pin, then slide it back and to

the right.

Caution

Do not force this removal. Be sure the locating pin is

clear of the hole before sliding the distribution tube

out.

Part Number 000019553 Rev 00 04/26 UnderCounter - 49

Disassembly

• Twist both of the inner tube ends until the tabs line up

with the keyway.

• Pull the inner tube ends outward.

KEYWAY

INNER

TUBE

TAB

INNER

TUBE

SV1211

Water Distribution Tube Disassembly

50 - UnderCounter Part Number 000019553 Rev 00 04/26

F. Remove the Float Valve

• Turn the splash shield counterclockwise one

or two turns.

COMPRESSION

FITTING

FLOAT VALVE BRACKET

SHUT-OFF VALVE

CAP AND FILTER

SCREEN

SPLASH

SHIELD

FLOAT

SV1695-2

Float Valve Removal

• Pull the float valve forward and off the

mounting bracket.

• Disconnect the water inlet tube from the

float valve at the compression fitting.

• Remove the cap and filter screen for

cleaning.

Part Number 000019553 Rev 00 04/26 UnderCounter - 51

G. Remove the Water Trough

• Apply downward pressure on the siphon

tube and remove from the bottom of the

water trough.

• Remove the upper thumbscrew.

• While supporting the water trough remove

the two thumbscrews from beneath the

water trough.

• Remove the water trough from the bin area.

UPPER

THUMBSCREW

SV1689-1

REMOVE

SIPHON

TUBE

LOWER

THUMBSCREWS

SV1689-2

Remove the Ice Damper

52 - UnderCounter Part Number 000019553 Rev 00 04/26

H. Remove the ice damper

• Grasp ice damper and apply pressure toward the left-

hand mounting bracket.

• Apply pressure to the right-hand mounting bracket

with thumb.

• Pull ice damper forward when the right-hand ice

damper pin disengages.

STEP 1

STEP 2

STEP 3

SV1742A

Installation

• Place ice damper pin in left-hand mounting bracket

and apply pressure toward the left-hand mounting

bracket.

• Apply pressure to the right-hand mounting bracket

with thumb.

• Push ice damper toward evaporator until right-hand

damper pin engages.

STEP 1

STEP 2

STEP 3

SV1742H

Part Number 000019553 Rev 00 04/26 UnderCounter - 53

Remove the Bin Door

• Grasp the rear of the bin door and pull bin door

forward approximately 5”.

• Slide bin door to the rear while applying upward

pressure (The rear door pins will ride up into the track

slot and slide backward to the stop tab).

• While applying pressure against the bin door pull

down on the rear of each bin door track until the door

pins clear the stop tabs.

• Slide the rear door pins off the end and then below the

door track. Slide bin door forward allowing the back

of the door to lower into the bin. Continue forward

with the bin door until the front pins bottom out in the

track.

• Lift right side of door until the front pins clear the

track, then remove door from bin.

• Remove rollers (4) from all door pins.

STOP TAB

SLIDE DOOR

FORWARD

TRACK SLOT

SV1748

54 - UnderCounter Part Number 000019553 Rev 00 04/26

Step 7 Mix a solution of de-scaler and warm water.

Depending on the amount of mineral buildup, a larger

quantity of solution may be required. Use the ratio in the

table below to mix enough solution to thoroughly de-scale

all parts.

Solution Type Water Mixed with

De-scaler 1 gal. (4 l) 16 oz (500 ml) de-scaler

Step 8 Use 1/2 of the de-scaler solution to de-scale all

components. The solution will foam when it contacts lime

scale and mineral deposits; once the foaming stops use

a soft bristle brush, sponge or cloth (not a wire brush) to

carefully de-scale the parts. Soak the parts for 5 minutes

(15 – 20 minutes for heavily scaled parts). Rinse all

components with clean water.

Step 9 While components are soaking, use 1/2 of

the solution to de-scale all foodzone surfaces of the ice

machine and bin. Use a nylon brush or cloth to thoroughly

de-scale the following ice machine areas:

• Evaporator plastic parts – including top, bottom

and sides

• Bin bottom, sides and top

Rinse all areas thoroughly with clean water.

Step 10 Mix a solution of sanitizer and warm water.

Solution Type Water Mixed With

Sanitizer 6 gal. (23 l) 4 oz (120 ml) sanitizer

Part Number 000019553 Rev 00 04/26 UnderCounter - 55

Step 11 Use 1/2 of the sanitizer/water solution to

sanitize all removed components. Use a cloth or sponge to

liberally apply the solution to all surfaces of the removed

parts or soak the removed parts in the sanitizer/water

solution. Do not rinse parts after sanitizing.

Step 12 Use 1/2 of the sanitizer/water solution to

sanitize all foodzone surfaces of the ice machine and bin.

Use a cloth or sponge to liberally apply the solution. When

sanitizing, pay particular attention to the following areas:

• Evaporator plastic parts - including top, bottom and

sides

• Bin bottom, sides and top

Do not rinse the sanitized areas.

Step 13 Replace all removed components.

Step 14 Reapply power and water to the ice machine

and place the toggle switch in the WASH position.

Add the proper amount of Ice Machine Sanitizer to the

water trough.

Model Amount of Sanitizer

KF0150 K0170 2.2 ounces (66 ml)

KF0250 K0270 1.9 ounces (57 ml)

Step 15 Wait until the sanitize cycle is complete

(approximately 22 minutes) then place the toggle switch in

the OFF position, disconnect power and water supplies to

the ice machine.

Warning

Disconnect electric power to the ice machine at the

electric switch box before proceeding.

Step 16 Repeat step 6 to remove parts for hand

sanitizing.

56 - UnderCounter Part Number 000019553 Rev 00 04/26

Step 17 Mix a solution of sanitizer and warm water.

Solution Type Water Mixed With

Sanitizer 6 gal. (23 l) 4 oz (120 ml) sanitizer

Step 18 Use 1/2 of the sanitizer/water solution to

sanitize all removed components. Use a cloth or sponge to

liberally apply the solution to all surfaces of the removed

parts or soak the removed parts in the sanitizer/water

solution. Do not rinse parts after sanitizing.

Step 19 Use 1/2 of the sanitizer/water solution to

sanitize all foodzone surfaces of the ice machine and bin.

Use a cloth or sponge to liberally apply the solution. When

sanitizing, pay particular attention to the following areas:

• Evaporator plastic parts - including top, bottom and

sides

• Bin bottom, sides and top

Do not rinse the sanitized areas.

Step 20 Replace all removed components.

Step 21 Reapply power and water to the ice machine

and place the toggle switch in the ICE position.

Part Number 000019553 Rev 00 04/26 UnderCounter - 57

ICE MACHINE INSPECTION

Check all water fittings and lines for leaks. Also, make sure

the refrigeration tubing is not rubbing or vibrating against

other tubing, panels, etc.

Do not put anything (boxes, etc.) in front of the ice

machine. There must be adequate airflow through and

around the ice machine to maximize ice production and

ensure long component life.

EXTERIOR CLEANING

Clean the area around the ice machine as often as

necessary to maintain cleanliness and efficient operation.

Sponge any dust and dirt off the outside of the ice machine

with mild soap and water. Wipe dry with a clean, soft

cloth.

A commercial grade stainless steel cleaner/polish can be

used as necessary.

CLEANING THE CONDENSER

Warning

Disconnect electric power to the ice machine at the

electric service switch before cleaning the condenser.

Caution

If you are cleaning the condenser fan blades with

water, cover the fan motor to prevent water damage.

FIN COMB

CONDENSER

COMB

DOWN

ONLY

58 - UnderCounter Part Number 000019553 Rev 00 04/26

Air-cooled Condenser

A dirty condenser restricts airflow, resulting in excessively

high operating temperatures. This reduces ice production

and shortens component life. Clean the condenser at least

every six months. Follow the steps below.

Warning

The condenser fins are sharp. Use care when cleaning

them.

1. The washable aluminum filter on self-contained air-

cooled ice machines is designed to catch dust, dirt,

lint and grease. This helps keep the condenser clean.

Clean the filter with a mild soap and water solution.

2. Clean the outside of the condenser with a soft brush

or a vacuum with a brush attachment. Clean from top

to bottom, not side to side. Be careful not to bend the

condenser fins.

3. Shine a flashlight through the condenser to check for

dirt between the fins. If dirt remains:

A. Blow compressed air through the condenser fins

from the inside. Be careful not to bend the fan

blades.

B. Use a commercial condenser coil cleaner. Follow

the directions and cautions supplied with the

cleaner.

4. Straighten any bent condenser fins with a fin comb.

5. Carefully wipe off the fan blades and motor with

a soft cloth. Do not bend the fan blades. If the fan

blades are excessively dirty, wash with warm, soapy

water and rinse thoroughly.

Part Number 000019553 Rev 00 04/26 UnderCounter - 59

Removal from Service/Winterization

General

Special precautions must be taken if the ice machine is to

be removed from service for an extended period of time or

exposed to ambient temperatures of 32°F (0°C) or below.

Caution

If water is allowed to remain in the ice machine

in freezing temperatures, severe damage to some

components could result. Damage of this nature is not

covered by the warranty.

Follow the applicable procedure below.

Self-contained Air-cooled Models

1. Disconnect the electric power at the circuit breaker or

the electric service switch.

2. Turn off the water supply.

3. Remove the water from the water trough.

4. Disconnect and drain the incoming ice-making water

line at the rear of the ice machine.

5. Blow compressed air in both the incoming water and

the drain openings in the rear of the ice machine until

no more water comes out of the inlet water lines or

the drain.

6. Make sure water is not trapped in any of the water

lines, drain lines, distribution tubes, etc.

60 - UnderCounter Part Number 000019553 Rev 00 04/26

Water-cooled Ice Machines

1. Perform steps 1-6 under “Self-contained Air-cooled

Models” on page 59.

2. Disconnect the incoming water and drain lines from

the water-cooled condenser.

3. Insert a large screwdriver between the bottom spring

coils of the water regulating valve. Pry upward to

open the valve.

SV1624

Pry Open the Water Regulating Valve

4. Hold the valve open and blow compressed air through

the condenser until no water remains.

PaPart Number 000019553 Rev 00 04/26 UnderCounter - 61

KP0150 & KP0250

TOUCH PAD FEATURES

The touch pad offers a series of pressure sensitive buttons

to control ice machine operation and provide operational

status.

On/Off - Blue = Machine On

Off = Machine Is Off

Delay - Blue = Delay Mode On

Off = Delay Mode Is Off

Clean - Yellow = Clean Cycle On

Off = Cleaning is Off

Flashing = Cleaning Is Paused

Bin Full - Blue = Bin Is Full

Off = Bin Is Not Full

Service - Red = Needs Service

Off = Doesn’t Need Service

Operation

62 - UnderCounter Part Number 000019553 Rev 00 04/26

On/Off Button

The On/Off Button is used to start and stop ice making.

The blue light indicates whether the ice machine is in Ice

Making (light on) or Off (light off).

NOTE: Stopping and restarting a freeze cycle with ice on

the evaporator will result in a thick bridge and larger than

normal cubes; or result in an ice slab that will not release

from the evaporator.

Delay Button

Pressing the Delay button will start a delay period. The ice

machine will finish the freeze and harvest cycle and then

start the delay period.

• Pressing the button once will start a 4 hour delay

period.

• Pressing the button twice will start a 12 hour delay

period.

• Pressing the button three times will start a 24 hour

delay period.

• Pressing the button four times will cancel the delay

periods.

NOTE: The delay period will be canceled if power is

interrupted to the ice machine. When power is restored,

the ice machine will start an ice making cycle.

Part Number 000019553 Rev 00 04/26 UnderCounter - 63

Clean Button

Pressing the Clean button for 3 seconds will start a clean

cycle. After the clean cycle is complete, the ice machine

will automatically start an ice making cycle.

• Pressing the Clean button again within 45 seconds of

the clean cycle starting will abort the clean cycle.

• Pressing the On/Off button after 45 seconds will pause

the Clean cycle. The On/Off light will flash on/off to

indicate pause mode. Pressing the On/Off button

again will continue the Clean cycle from the point of

interruption.

• Pressing the control board test button anytime during

the clean cycle will cancel the clean cycle.

• Opening the damper for 30 seconds during the clean

cycle will start and automatic shutdown sequence.

Bin Full Light

The Bin Full light energizes when the bin is full or is de-

energized if the bin is not full.

Service Light

The Service light indicates the machine needs attention.

• Refer to service limits if this light is energized.

64 - UnderCounter Part Number 000019553 Rev 00 04/26

CONTROL BOARD REVISIONS

1. Original control board

1. Control board with J4 terminal, which can utilize a

thermistor to control when/if a water pump delay

occurs in the freeze cycle.

2. Control board with the addition of J8 & J9 terminals.

The J8 terminal can control an EC fan motor.

NOTE: The replacement control board is backward

compatible and can be used without thermistors or EC fan

motors.

FIRMWARE REVISIONS

In addition to the primary sequence of operation the

following firmware changes have been added.

Control boards with water trough thermistor and

firmware version before 2.70

The water trough thermistor performs the following

function in the freeze cycle:

• When the temperature of the water reaches 34° F the

water pump de-energizes for 25 seconds,

then re energizes.

• When the water pump restarts the water inlet

solenoid energizes for 7 seconds..

2.70 and Higher

• 120 second prechill cycle on initial start and 60 second

prechill cycles thereafter.

Part Number 000019553 Rev 00 04/26 UnderCounter - 65

ICE MAKING SEQUENCE OF OPERATION

The On/Off button must be depressed and the ice damper

must be closed before the ice machine will start.

The following is the primary sequence of operation.

Firmware revisions will alter some of the timing sequences

and are noted in firmware revisions.

Initial Start-up From Shutoff

The dump valve energizes to purge any water in the water

trough down the drain. The harvest valve energizes to

equalize refrigerant pressures before the compressor

starts.

Freeze Cycle

Prechill - The refrigeration system chills the evaporator

before water flow over the evaporator starts. The water

inlet valve energizes during the prechill and remains on

until the ice thickness float switch is satisfied.

Freeze - Water flowing across the evaporator cools as

the freeze cycle progresses. (Firmware version 2.58 or

higher: The water pump turns off for 25 seconds and the

water inlet valve energizes for 7 seconds when the pump

restarts) Water flowing across the evaporator will start to

freeze and build ice on the evaporator. After a sheet of ice

has formed, the harvest float switch signals the control

board to start a harvest cycle.

Harvest Cycle

Every third cycle the remaining water is purged down

the drain. The refrigerant gas warms the evaporator and

the sheet of cubes slides off the evaporator and into the

storage bin. If all cubes fall clear of the ice damper the ice

machine starts another freeze cycle. The maximum harvest

time is a total of 7 minutes.

If the bin switch does not activate within 3.5 minutes, the

harvest cycle extends another 3.5 minutes.

66 - UnderCounter Part Number 000019553 Rev 00 04/26

Full Bin Cycle

If the ice damper is held open by ice cubes the ice machine

shuts off. When the ice damper closes the ice machine

starts a new cycle at Initial Start-up From Shutoff. The ice

machine will remain off for a 3 minute delay period.

Thaw Cycle

The maximum harvest time is a total of 7 minutes.

If the bin switch does not activate within 7 minutes a thaw

cycle initiates using the following sequence:

1. The compressor de-energizes.

2. The water inlet valve energizes and fills the water

trough.

3. The water pump energizes for 2 minutes and

circulates water over the evaporator.

If the bin switch did not open & close.

4. The water dump valve energizes and drains water

from the water trough.

5. Step 1 through 4 repeat.

6. If the damper does not open/close after step 5, the

control board assumes no ice is on the evaporator and

an initial startup cycle starts.

• If the bin switch opens & closes anytime during the

thaw cycle the ice machine starts a new freeze cycle.

• If the bin switch opens and remains open for 30

seconds at any point in the thaw cycle the ice machine

will enter an automatic shutoff cycle.

• The maximum water fill time for the thaw cycle is 105

seconds for each of the two possible thaw cycles.

Part Number 000019553 Rev 00 04/26 UnderCounter - 67

CONTROL BOARD TIMERS

• The ice machine is locked into the freeze cycle for 6

minutes before a harvest cycle can be initiated.

• The freeze time lock in feature is bypassed on the

initial cycle (manual start or after a full bin/service

limit condition).

• The water fill valve is de-energized 1 minute after the

freeze cycle starts. The control board will energize the

water inlet valve one more time 3 minutes into the

freeze cycle.

• If the harvest float switch is in the down position for

10 continuous seconds during the start of a freeze

cycle, a harvest sequence is initiated.

• The maximum freeze time is 35 minutes at which time

the control board automatically initiates a harvest

sequence.

• The maximum harvest time is a total of 7 minutes.

If the bin switch does not activate within 3.5 minutes,

the harvest cycle extends another 3.5 minutes. If 7

minutes is exceeded a thaw cycle starts.

• After the initial harvest cycle from either an automatic

shut off or initial start the dump valve solenoid will

only energize and purge the water in the water trough

every third cycle.

Control boards with thermistor and firmware version

before 2.70

The water trough thermistor performs the following

function in the freeze cycle:

• When the temperature of the water reaches 34° F the

water pump de-energizes for 25 seconds,

then re energizes.

• When the water pump restarts the water inlet

solenoid energizes for 7 seconds.

68 - UnderCounter Part Number 000019553 Rev 00 04/26

SERVICE LIMITS

Service limits are stored and indicated by the control

board. The number of cycles required to stop the ice

machine varies for each service limit.

Service limits can be reset by pressing the On/Off button

and starting a new ice making cycle.

A service limit shutdown is indicated by the red Service

light on the touch pad.

Service Limit 1

If the freeze time reaches 30-60 minutes*, the control

board automatically initiates a harvest cycle.

• After 3 consecutive 30-60 minute* cycles control board

light SL#1 along with the touch pad Service (wrench)

light will flash on/off at 1 second intervals.

• If 6 consecutive 30-60 minute* freeze cycles occur, the

ice machine stops and the SL#1 light on the control

board and the Service (wrench) light on the touch pad

will be on continuously.

NOTE: *Verify your firmware version (label on the control

board) for freeze time.

Firmware

Version

Freeze

Time

V1.0 to V2.53 60 minutes

V2.54 to V2.9 45 minutes

V3.0 to current 30 minutes

Part Number 000019553 Rev 00 04/26 UnderCounter - 69

Service Limit 2

• If the harvest time reaches 3.5 minutes, the control

board automatically energizes the water pump and

extends the harvest cycle another 3.5 minutes (7

minutes total).

• If the ice damper does not open and close within the

7 minute harvest cycle the ice machine enters a water

thaw cycle for 170 seconds.

• If the damper does not open/close within the 170

second thaw cycle, a second thaw cycle starts.

• The control board automatically initiates a freeze

sequence when the thaw cycle(s) is complete.

• If 3 consecutive 7 minute harvest/thaw cycles occur,

the ice machine stops.

Service Limit 3

If the freeze time reaches 4 minutes and water is not

sensed (float remains down for 10 continuous seconds) the

ice machine stops.

• Service Limit 3 is bypassed on the initial cycle (manual

start or after a full bin/service limit condition). For all

subsequent cycles if the freeze time reaches 4 minutes

and water is not sensed, the ice machine stops and

initiates a 30 minute delay period. Control board

lights SL#1 and SL#2 along with the touch pad Service

(wrench) light will flash on/off at 1 second intervals.

• The ice machine automatically restarts at the end of

the 30 minute delay period and stops flashing the

control board and Service (wrench) lights.

• If 100 consecutive failures occur the ice machine stops

and the touch pad Service (wrench) light remains

energized.

70 - UnderCounter Part Number 000019553 Rev 00 04/26

ENERGIZED PARTS CHART

KP0150 & KP0250

ICE MAKING

SEQUENCE OF

OPERATION

Water

Pump

Harvest

Valve

Water Inlet

Valve

Dump

Valve

Compressor

& Condenser

Fan Motor *

Harvest Float

Switch

Ice Thickness

Float Switch

Length of Time

Initial Start-up

1. Water purge

Off On Off On Off Closed Closed 20 seconds

2. Refrigeration

System Start-up

Off On Off Off On Closed Closed 5 seconds

Freeze Sequence

3. Prechill

Off Off On Off On Open Closed

60 Seconds

120 Seconds Initial Cycle

After Automatic Shutoff

4. Freeze

On** Off On ** Off On

Open Then

Closed

Closed Then

Open

Until Harvest Float Switch

closes for 10 continual

seconds

Part Number 000019553 Rev 00 04/26 UnderCounter - 71

ICE MAKING

SEQUENCE OF

OPERATION

Water

Pump

Harvest

Valve

Water Inlet

Valve

Dump

Valve

Compressor

& Condenser

Fan Motor *

Harvest Float

Switch

Ice Thickness

Float Switch

Length of Time

Harvest

Sequence

5. Water Purge

Off On Off

Initial

cycle,

then

every

3rd

On Closed Closed

20 seconds

Water purge initial cycle,

then every 3rd cycle

thereafter

6. Harvest Off*** On Off*** Off*** On Closed Closed Bin switch activation

7. Automatic

Shutoff

Off Off Off Off Off Closed Closed

3 Minute delay and bin

switch re-closure

* Condenser Fan Motor: The fan motor is wired through a fan cycle pressure control; therefore, it may cycle on and off.

** Firmware 2.58 with thermistor - When the water temperature reaches 34°F the water pump de-energizes for 25 seconds . When the pump restarts the

water inlet valve energizes for 7 seconds. Firmware 2.58 without thermistor - At 3.75 minutes the water pump de-energizes for 25 seconds. When the

pump restarts the water inlet valve energizes for 7 seconds.

Firmware prior to 2.58 - The water fill valve is de-energized by the control board 1 minute after the freeze cycle starts - The control board will energize the

water inlet valve for 7 seconds one last time, 3 minutes into the freeze cycle, regardless of float position.

*** Will be energized during harvest when time exceeds 3.5 minutes.

**** The water pump de-energizes for 25 seconds then re-energizes

72 - UnderCounter Part Number 000019553 Rev 00 04/26

Operational Checks

ICE THICKNESS CHECK

After a harvest cycle, inspect the ice cubes in the ice

storage bin. The ice bridge connects the ice cubes and

must be set to maintain an ice bridge thickness of 1/8”

(3.2 mm). To adjust the thickness of the bridge refer to ice

thickness adjustment.

ICE THICKNESS ADJUSTMENT

The ice thickness can be adjusted to three levels.

1. Pull forward on the bottom of the bracket until clear

of the tab.

2. Slide the bracket over the desired tab and release.

• The center position is the normal factory setting.

• To increase bridge thickness, raise the water level.

• To decrease bridge thickness, lower the water

level.

THICKER

BRIDGE

THINNER

BRIDGE

FACTORY

DEFAULT

Part Number 000019553 Rev 00 04/26 UnderCounter - 73

MINIMUM/MAXIMUM SLAB WEIGHT

Model

Minimum

Ice Weight Per Cycle

lbs

Grams

Maximum

Ice Weight Per Cycle

lbs

Grams

KP0150

1.13 lbs

(513 grams)

1.36 lbs

(617 grams)

KP0250

2.26 lbs

(1025 grams)

2.93 lbs

(1329 grams)

WATER PURGE BYPASS

Every third harvest cycle the remaining water in the water

trough is purged down the drain.

To bypass this feature (purge every harvest):

1. Press & hold the “CLEAN” button for at least 3

seconds while in the ice making cycle.

2. Press the “DELAY” button.

3. The red “SERVICE” light will flash 5 times to indicate

bypass.

4. Repeat steps to reinstate “third harvest cycle water

purge.” Now the red “SERVICE” light will flash 6 times.

Bypassing the Water Purge will increase water usage.

74 - UnderCounter Part Number 000019553 Rev 00 04/26

K & KF Models

INITIAL STARTUP OR STARTUP AFTER AUTOMATIC

SHUTOFF

1. Pressure Equalization

Before the compressor starts the harvest valve is energized

for 15 seconds to equalize pressures during the initial

refrigeration system start-up.

2. Refrigeration System Start-up

The compressor starts after the 15-second pressure

equalization, and remains on throughout the entire Freeze

and Harvest Sequences. The harvest valve remains on for

5 seconds during initial compressor start-up and then shuts

off.

At the same time the compressor starts, the condenser

fan motor (air-cooled models) is supplied with power

throughout the entire Freeze and Harvest Sequences. The

fan motor is wired through a fan cycle pressure control,

therefore it may cycle on and off. (The compressor and

condenser fan motor are wired through the relay. As a

result, any time the relay coil is energized, the compressor

and fan motor are supplied with power.)

FREEZE SEQUENCE

3. Prechill

The compressor is on for 30 seconds prior to water flow to

prechill the evaporator.

4. Freeze

The water pump starts after the 30-second prechill. An

even flow of water is directed across the evaporator and

into each cube cell, where it freezes.

When sufficient ice has formed, the water flow (not the

ice) contacts the ice thickness probe. After approximately

7 seconds of continual water contact, the Harvest

Sequence is initiated. The ice machine cannot initiate a

Harvest Sequence until a 6-minute freeze time has been

surpassed.

Part Number 000019553 Rev 00 04/26 UnderCounter - 75

HARVEST SEQUENCE

5. Harvest

The water pump de-energizes stopping flow over the

evaporator. The rising level of water in the sump trough

diverts water out of the overflow tube, purging excess

minerals from the sump trough. The harvest valve also

opens to divert hot refrigerant gas into the evaporator.

The refrigerant gas warms the evaporator causing the

cubes to slide, as a sheet, off the evaporator and into the

storage bin. The sliding sheet of cubes contacts the ice

damper, opening the bin switch.

The momentary opening and re-closing of the bin switch

terminates the Harvest Sequence and returns the ice

machine to the Freeze Sequence (steps 3 - 4).

AUTOMATIC SHUTOFF

6. Automatic Shut-off

When the storage bin is full at the end of a harvest

sequence, the sheet of cubes fails to clear the ice damper

and will hold it down. After the ice damper is held open

for 7 seconds, the ice machine shuts off. The ice machine

remains off for 3 minutes before it can automatically

restart.

The ice machine remains off until enough ice has been

removed from the storage bin to allow the ice to fall clear

of the damper. As the ice damper swings back to the

operating position, the bin switch re-closes and the ice

machine restarts (steps 1 - 2), provided the 3 minute delay

period is complete.

76 - UnderCounter Part Number 000019553 Rev 00 04/26

ENERGIZED PARTS CHART

ICE MAKING SEQUENCE

OF OPERATION

Control Board Relays Relay

Length of Time

Water Pump

Harvest Valve

Relay Coil

Compressor

Compressor Fan

Motor*

Initial Start-up

1. Water purge

off on off off off 15 seconds

2. Refrigeration System

Start-up

off on on on on 5 seconds

Freeze Sequence

3. Pre chill

off off on on on 30 seconds

4. Freeze on off on on on

Until 7 sec. Water

contact w/ice

thickness probe

Harvest Sequence

5. Harvest

offonononon

Bin switch

activation

Automatic Shut-off

6. Auto Shut-off

off off off off off

Until bin switch

re-closes

* Condenser Fan Motor: The fan motor is wired through a

fan cycle pressure control; therefore, it may cycle on and off.

Part Number 000019553 Rev 00 04/26 UnderCounter - 77

Operational Checks

Siphon System

To reduce mineral build-up and de-scaling frequency, the

water in the sump trough must be purged during each

harvest cycle.

When the water pump de-energizes, the level in the water

trough rises above the standpipe, starting a siphon action.

The siphon action stops when the water level in the sump

trough drops. When the siphon action stops, the float

valve refills the water trough to the correct level.

Follow steps 1 through 6 under water level check to verify

the siphon system functions correctly.

Water Level

Check the water level while the ice machine is in the ice

mode and the water pump is running. The correct water

level is 1/4" (6.3 mm) to 3/8" (9.5 mm) below the top of

the standpipe. A line in the water trough indicates the

correct level.

SIPHON CAP

SET THE WATER LEVEL TO

THE LINE IN THE WATER

TROUGH

SV1689-1

78 - UnderCounter Part Number 000019553 Rev 00 04/26

Water Level Check

The float valve is factory-set for the proper water level. If

adjustments are necessary:

1. Verify the ice machine is level.

2. Remove the siphon cap from the standpipe.

3. Place the main ON/OFF/WASH toggle switch to the

ON position, and wait until the float valve stops

adding water.

4. Adjust the water level to [1/4" to 3/8" (6.3 to 9.5 mm)

below the standpipe] the line in the water trough:

A. Loosen the two screws on the float valve bracket.

B. Raise or lower the float valve assembly as

necessary, then tighten the screws.

5. Move the main ON/OFF/WASH toggle switch to the

OFF position. The water level in the trough will rise

above the standpipe and run down the drain.

6. Replace the siphon cap on the standpipe, and verify

water level and siphon action by repeating steps 3

through 5.

Part Number 000019553 Rev 00 04/26 UnderCounter - 79

Ice Thickness Check

After a harvest cycle, inspect the ice cubes in the ice

storage bin. The ice thickness probe is set to maintain an

ice bridge of 1/8" (3.2 mm). If an adjustment is needed,

follow the steps below.

1. Turn the ice thickness probe adjustment screw

clockwise for a thicker ice bridge, or counterclockwise

for a thinner ice bridge.

2. Make sure the ice thickness probe wire and bracket

does not restrict movement of the probe.

ADJUSTING

SCREW

Ice Thickness Adjustment

THIS PAGE INTENTIONALLY LEFT BLANK

Part Number 000019553 Rev 00 04/26 UnderCounter - 81

KP Models

NOTE: “K & KF Models” on page 126 .

PROBLEM CHECKLIST

Problem Possible Cause Correction

Ice machine does

not operate

No electrical power to

the ice machine.

Replace the fuse/reset the

breaker/turn on the main

switch/plug power cord

into receptacle.

Ice machine needs to

be turned on.

Press the On/Off button to

start ice making.

Damper in open

position (down).

Damper must be in upright

position and capable of

swinging freely.

Ice machine

stops, and can

be restarted by

turning the ice

machine OFF/

ON.

Service limit feature

stopping the ice

machine.

Refer to “Service Limit

Feature”

Ice sheet is thick

Water trough level is

too high.

Adjust ice thickness float.

Power button was

turned off/on during

freeze cycle and

ice remained on

evaporator.

Allow ice to thaw and

release from evaporator,

then restart.

Ice damper was opened

then closed in the

harvest cycle before the

ice released.

Allow ice to thaw and

release from evaporator,

then restart.

Ice machine

does not release

ice or is slow to

harvest.

Ice machine is dirty.

Descale and sanitize the ice

machine

Ice machine is not level. Level the ice machine.

Low air temperature

around ice machine

(air-cooled models).

Air temperature must be at

least 40° F (4°C).

Ice machine

does not release

ice or is slow to

harvest.

Water regulating valve

leaks in harvest mode

(water-cooled models).

Replace water regulating

valve.

Troubleshooting

82 - UnderCounter Part Number 000019553 Rev 00 04/26

Problem Possible Cause Correction

Ice machine does

not cycle into

harvest mode.

The six-minute freeze

time lock-in has not

expired yet.

Wait for freeze lock-in to

expire.

Harvest float switch

is dirty.

Descale and sanitize the ice

machine.

Harvest float switch

wire is disconnected.

Connect the wire.

Harvest float switch is

out of adjustment.

Adjust the harvest float

switch.

Uneven ice fill (thin at

top of evaporator).

Refer to “Shallow or

Incomplete Cubes.”

Ice quality is

poor (soft or not

clear).

Poor incoming water

quality.

Test the quality of the

incoming water and

make appropriate filter

recommendations.

Water filtration is poor. Replace the filter.

Ice machine is dirty.

Descale and sanitize the ice

machine.

Water softener is

working improperly (if

applicable).

Repair the water softener.

Ice machine

produces shallow

or incomplete

cubes, or the ice

fill pattern on

the evaporator is

incomplete.

Ice thickness switch is

out of adjustment.

Adjust the ice thickness

switch.

Water trough level is

too high or too low.

Check the water level.

Water filtration is poor. Replace the filter.

Hot incoming water.

Connect the ice machine to

a cold water supply.

Incorrect incoming

water pressure.

Water pressure must be 20-

80 psi (137.9 -551.5 kPa).

Ice machine is not level. Level the ice machine.

Low ice capacity.

The condenser is dirty. Descale the condenser.

High air temperature

around ice machine

(air-cooled models).

Air temperature must not

exceed 110° F (43°C).

Inadequate clearance

around the ice

machine.

Provide adequate

clearance.

Objects stacked around

ice machine, blocking

condenser airflow.

Remove items blocking

airflow.

Hot incoming water. Connect to cold water.

Incorrect incoming

water pressure. Water

pressure is too low or

water filter is restricted.

Water pressure must be 20-

80 psi (137.9 -551.5 kPa).

Replace water filter.

Part Number 000019553 Rev 00 04/26 UnderCounter - 83

Problem Possible Cause Correction

Ice sheet is thick.

Water trough level is

too high.

Adjust ice thickness float.

Power button was

turned off/on during

the freeze cycle and

ice remained on the

evaporator.

Allow ice to thaw

and release from the

evaporator, then restart.

Ice damper was opened

and closed in the

harvest cycle before the

ice released

Allow ice to thaw

and release from the

evaporator, then restart

Long harvest cycles

with repeated service

limit indication.

Descale the ice machine

& perform diagnostic

procedures as required.

Incoming water

pressure is over

80 psig (5 bar, 552 kPa).

Verify incoming water

pressure.

84 - UnderCounter Part Number 000019553 Rev 00 04/26

CONTROL BOARD TEST MODE

NOTE: The ice damper/bin switch can be open or closed

and does not effect the operation of the test mode.

To enter the test mode press and hold the test switch

on the control board for 3 seconds. Refer to “Electronic

Control Board” on page 232 for test button location. The

control board test mode performs the following functions

for a 2 minute time period:

• Energizes all control board relays

• Energizes all control board lights

• Energizes all touch pad control lights

After the 2 minute test period the control board will

complete 500 ice making cycles, then stop.

Canceling a test cycle:

To cancel a test cycle press the test button a second time.

Restarting a test cycle:

The test cycle will restart each time the test button is

pressed for a 3 second time period.

OPERATING ICE MACHINE WITH BIN AND TOUCH PAD

REMOVED

The ice machine is designed to allow diagnostic procedures

to be performed with the bin removed or to run ice

making cycles if a touch pad is defective. The touch pad is

attached to the bin and is disconnected during the removal

process. Use the control board test mode to operate the

ice machine without connecting the touch pad. Refer to

“Electronic Control Board” on page 232 for test button

location

NOTE: Firmware versions before 2.70 operate for 1 cycle

in test mode. Firmware versions after 2.70 operate for 500

cycles in test mode.

Part Number 000019553 Rev 00 04/26 UnderCounter - 85

TROUBLESHOOTING BY SYMPTOM

KP Models

The troubleshooting procedures follow diagnostic charts.

There are four symptoms, the symptom that you are

experiencing will determine which diagnostic chart to

use. The chart asks yes and no questions to determine

the problem. The diagnostic chart will direct you to a

procedure to correct the problem.

SYMPTOM #1

Ice Machine Stops Running

Ice machine is in Ice Making cycle

Has a History of Shutting Down

• Refer to Ice Machine Stops Running diagnostic chart

SYMPTOM #2

Ice Machine has a Long Freeze Cycle

Ice Formation is Thick

Thin Ice Fill on Inlet or Outlet of Evaporator

Low Production

Service Fault (possible)

• Refer to Freeze Cycle Refrigeration System Operational

Analysis Table

SYMPTOM #3

Ice Machine Will Not Harvest - Freeze Cycle is Normal and

Ice Cubes are Not Melted After Harvest

Long Harvest (possible)

• Refer to Refrigeration Harvest Flow Chart

SYMPTOM #4

Ice Machine Will Not Harvest - Freeze Cycle is Normal and

Ice Cubes are Melted After Harvest

• Refer to Ice Meltout Flow Chart

86 - UnderCounter Part Number 000019553 Rev 00 04/26

SYMPTOM #1

Ice Machine stops running or has history of shutting down

YES

Refer to “Diagnosing an Ice

Machine that Will Not Run”

Does the unit start when

Power Buon is pressed?

Does the user interface

have any LED lights ON??

Is the Full Bin

light ON?

Unit was OFF, check

Operaon.

YES

Part Number 000019553 Rev 00 04/26 UnderCounter - 87

Unit is in a delay

mode. Push Delay

buon unl all are

OFF. (4, 12, 24)

YES

the Clean LED

ON?

Ice

Machine is

Clean Cycle,

Complete Cleaning.

YES

Is the Service

Wrench

ON or

FLASHING?

Is the

Power

Buon ON?

Unit is ON, check

Operaon.

YES

Install Ice Damper

Replace The Ice Damper

Run machine & check

for Normal Operaon

Is the Ice Damper magnet

aached?

Refer to Bin

Switch

Diagnostics

YES

Is the Ice Damper

closed & in place?

YES

Refer to “Diagnosing

an Ice Machine that

Will Not Run”

YES

Are any

Delay LEDs ON?

(4, 12, 24)

88 - UnderCounter Part Number 000019553 Rev 00 04/26

YES

How many mes did the Harvest

LED light ﬂash aer reseng the

toggle switch?

Refer to Safety Limit #1

Long Freeze Cycle

Refer to Safety Limit #2

Long Harvest Cycle

SL1/LED

Flash (Once)

Refer to Safety Limit #3

No Water/Water Loss

SL2/LED

Flash (Twice)

SL3 (SL1 &SL2 LEDs)

Flash (Three)

Part Number 000019553 Rev 00 04/26 UnderCounter - 89

#2  LOW PRODUCTION, LONG FREEZE CYCLE

Ice Machine has a Long Freeze Cycle

Ice Formation is Thick

Thin on Inlet or Outlet of Evaporator

Low Production

How to Use the Freeze Cycle Refrigeration System

Operational Analysis Table

GENERAL

These tables must be used with charts, checklists and

other references to eliminate refrigeration components

not listed on the tables and external items and problems

which can cause good refrigeration components to appear

defective.

The tables list five different defects that may affect the ice

machine’s operation.

NOTE: A low-on-charge ice machine and a starving

expansion valve have very similar characteristics and are

listed under the same column.

NOTE: Before starting, see “Before Beginning Service” for

a few questions to ask when talking to the ice machine

owner.

PROCEDURE

Step 1 Complete the “Operation Analysis” column.

Read down the left “Operational Analysis” column.

Perform all procedures and check all information listed.

Each item in this column has supporting reference material

to help analyze each step.

While analyzing each item separately, you may find an

“external problem” causing a good refrigerant component

to appear bad. Correct problems as they are found. If

the operational problem is found, it is not necessary to

complete the remaining procedures.

90 - UnderCounter Part Number 000019553 Rev 00 04/26

Step 2 Enter Checkmarks ().

Each time the actual findings of an item in the

“Operational Analysis” column matches the published

findings on the table, enter a Checkmark.

Example: Freeze cycle suction pressure is determined to be

low. Enter a Checkmark in the “low” column.

Step 3 Add the Checkmarks listed under each of

the four columns. Note the column number

with the highest total and proceed to “Final

Analysis.”

NOTE: If two columns have matching high numbers,

a procedure was not performed properly, supporting

material was not analyzed correctly or the problem

component is not covered by the analysis table.

Before Beginning Service

Ice machines may experience operational problems

only during certain times of the day or night. A machine

may function properly while it is being serviced, but

malfunctions later. Information provided by the user can

help the technician start in the right direction, and may be

a determining factor in the final diagnosis.

Ask these questions before beginning service:

• When does the ice machine malfunction? (night, day,

all the time, only during the Freeze cycle, etc.)

• When do you notice low ice production? (one day a

week, every day, on weekends, etc.)

• Can you describe exactly what the ice machine seems

to be doing?

• Has anyone been working on the ice machine?

• During “store shutdown,” is the circuit breaker, water

supply or air temperature altered?

• Is there any reason why incoming water pressure

might rise or drop substantially?

Part Number 000019553 Rev 00 04/26 UnderCounter - 91

REFRIGERATION ANALYSIS CHART

Operational Analysis 1 2 3 4

Ice Production Published 24 hour ice production________________

Calculated (actual) 24 hour ice production_______________

NOTE: The ice machine is operating properly if the ice fill pattern is normal and ice production is within 10%

of charted capacity.

Installation and Water

System

All installation and water related problems must be corrected

before proceeding with chart.

Ice Formation Pattern Ice formation is extremely

thin on outlet of

evaporator

-or-

No ice formation on entire

evaporator

Ice formation is extremely

thin on outlet of

evaporator

-or-

No ice formation on entire

evaporator

Ice formation is normal

-or-

Ice formation is extremely

thin on the bottom of

evaporator

-or-

No ice formation on

evaporator

Ice formation is normal

-or-

No ice formation on entire

evaporator

92 - UnderCounter Part Number 000019553 Rev 00 04/26

Operational Analysis 1 2 3 4

Service Limits

Refer to “Analyzing Service

Limits” to eliminate all non-

refrigeration problems.

Stops on service limit:

1 or 2

Stops on service limit:

1 or 2

Stops on service limit:

Ice Formation Pattern Ice formation is extremely

thin on outlet of

evaporator

-or-

No ice formation on entire

evaporator

Ice formation is extremely

thin on outlet of

evaporator

-or-

No ice formation on entire

evaporator

Ice formation is normal

-or-

Ice formation is extremely

thin on the bottom of

evaporator

-or-

No ice formation on

evaporator

Ice formation is normal

-or-

No ice formation on entire

evaporator

Service Limits

Refer to “Analyzing Service

Limits” to eliminate all non-

refrigeration problems.

Stops on service limit:

1 or 2

Stops on service limit:

1 or 2

Stops on service limit:

Part Number 000019553 Rev 00 04/26 UnderCounter - 93

Operational Analysis 1 2 3 4

Freeze Cycle

Discharge Pressure

________ ______

______

1 minute Middle End

If discharge pressure is High or Low, refer to freeze cycle high or low discharge pressure problem checklist to

eliminate problems and/or components not listed on this table before proceeding.

Freeze Cycle

Suction Pressure

________ ______

______

1 minute Middle End

If suction pressure is High or Low refer to freeze cycle high or low suction pressure problem checklist to

eliminate problems and/or components not listed on this table before proceeding.

Suction pressure is

High

Suction pressure is

Low

Suction pressure is

High

Suction pressure is

High

94 - UnderCounter Part Number 000019553 Rev 00 04/26

Operational Analysis 1 2 3 4

Harvest Valve

The harvest valve

inlet is

HOT

and

The compressor

discharge line is

HOT

The harvest valve

inlet is

COOL

and

The compressor

discharge line is

HOT

The harvest valve

inlet is

COOL

and

The compressor

discharge line is

COOL

The harvest valve

inlet is

COOL

and

The compressor

discharge line is

HOT

Discharge Line Temp.

Record freeze cycle

discharge line temp at the

end of freeze cycle.

Discharge line temp 150°F

(66°C) or higher at the

end of freeze cycle

Discharge line temp 150°F

(66°C) or higher at the

end of freeze cycle

Discharge line temp

less than 150°F (66°C) at

the end of freeze cycle

Discharge line temp 150°F

(66°C) or higher at the

end of freeze cycle

Final Analysis

Enter total number of

boxes checked in each

column.

Harvest Valve

Leaking

Low On Charge

-or-

TXV Starving

TXV Flooding Compressor

Part Number 000019553 Rev 00 04/26 UnderCounter - 95

ICE MACHINE DOES NOT CYCLE INTO HARVEST WHEN

THE HARVEST FLOAT IS DOWN/CLOSED

NOTE: The ice machine will make a thick or double slab

when a new freeze cycle is started with ice already present

on the evaporator.

• The ice damper/bin switch is opened/closed in the

harvest cycle before the ice releases.

Remove all ice from the evaporator before starting

diagnostic procedures.

Freeze Time Lock-In Feature

The ice machine control system incorporates a freeze

time lock-in feature. This prevents the ice machine from

short cycling in and out of harvest. The control board locks

the ice machine in the freeze cycle for six minutes. After

six minutes a harvest cycle can be initiated. To allow the

service technician to initiate a harvest cycle without delay,

this feature is not used on the first cycle after pressing the

power button OFF and back to ON.

96 - UnderCounter Part Number 000019553 Rev 00 04/26

Step 1 Disconnect power to the ice machine, remove

the electrical panel to allow viewing of the control board

lights and pull the wire connector for the harvest float

switch through the bulkhead and disconnect. Attach a

jumper wire to the wire terminals connected to the control

board.

Step 2 Bypass the freeze time lock-in feature by

pressing the power button to cycle the ice machine on.

Wait until water flows over the evaporator, then refer to

chart.

Result Correction

10 seconds into the freeze cycle

the ice machine cycles from freeze

to harvest and the control board

harvest light energizes.

The ice thickness float

switch, connectors or

wiring is causing the

malfunction.

The harvest light comes on, but the

ice machine remains in the freeze

cycle.

The ice machine is in a

6 minute freeze lock -

Cycle on/off and retest.

The harvest light stays off and the ice

machine remains in freeze.

Replace the control

board..

Part Number 000019553 Rev 00 04/26 UnderCounter - 97

ICE MACHINE CYCLES INTO HARVEST BEFORE THE

HARVEST FLOAT IS DOWN/CLOSED

Step 1 Disconnect power to the ice machine, remove

the electrical panel to allow viewing of the control board

lights and pull the wire connector for the harvest float

switch through the bulkhead and disconnect.

WIRE CONNECTORS ARE LOCATED BEHIND BULKHEAD

PULL THROUGH GROMMET TO DISCONNECT

HARVEST FLOAT

SWITCH & BRACKET

ICE THICKNESS FLOAT

SWITCH & BRACKET

Caution

Do not disassemble a float for descaling/sanitizing or

troubleshooting. The float magnet is not located in the

center of the float and incorrect reassembly will result

in an ice machine that will not harvest.

98 - UnderCounter Part Number 000019553 Rev 00 04/26

Step 2 Reapply power and press the power button to

cycle the ice machine off/on and bypass the freeze time

lock-in feature. Wait until water flows over the evaporator,

then refer to chart.

Result Correction

The harvest light does not come on

and the ice machine stays in freeze.

The ice thickness float

switch, connectors or

wiring is causing the

malfunction.

10 seconds into the freeze cycle

the ice machine cycles from freeze

to harvest and the control board

harvest light energizes.

Replace the control board.

Part Number 000019553 Rev 00 04/26 UnderCounter - 99

ICE PRODUCTION CHECK

The amount of ice a machine produces directly relates to

the operating water and air temperatures. This means an

ice machine with a 70°F (21°C) ambient temperature and

50°F (10°C) water produces more ice than the same ice

machine with 90°F (32°C) ambient and 70°F (21°C) water.

1. Determine the ice machine operating conditions:

Air temp entering condenser:____°

Air temp around ice machine:____°

Water temp entering sump trough:____°

2. Refer to the appropriate “Cycle Times, 24 Hr. Ice

Production and Refrigerant Pressure Charts” on page

209. Use the operating conditions determined in

Step 1 to find published 24-Hour Ice Production:_____

• Times are in minutes.

Example: 1 min. 15 sec. converts to 1.25 min.

(15 seconds ÷ 60 seconds = .25 minutes)

• Weights are in pounds.

Example: 2 lb. 6 oz. converts to 2.375 lb.

(6 oz. ÷ 16 oz. = .375 lb.)

3. Perform an ice production check using the formula

below.

1. + =

Freeze

Time

Harvest Time Total Cycle

Time

2. 1440 ÷ =

Minutes in

24 Hrs.

Total Cycle

Time

Cycles per Day

3. x =

Weight

of One

Harvest

Cycles per

Day

Actual 24-Hour

Production

100 - UnderCounter Part Number 000019553 Rev 00 04/26

Weighing the ice is the only 100% accurate check.

4. Compare the results of step 3 with step 2. Ice

production is normal when these numbers match

closely. If they match closely, determine if:

• Another larger ice machine is required.

• Relocating the existing equipment to lower the

load conditions is required.

Contact the local Manitowoc distributor for information on

available options and accessories.

Part Number 000019553 Rev 00 04/26 UnderCounter - 101

INSTALLATION/VISUAL INSPECTION CHECKLIST

Ice machine is not level

• Level the ice machine

Condenser is dirty

• Clean the condenser

Water filtration is plugged (if used)

• Install a new water filter

Water drains are not run separately and/or are not

vented

• Run and vent drains according to the Installation

Manual

WATER SYSTEM CHECKLIST

A water-related problem often causes the same symptoms

as a refrigeration system component malfunction.

Example: A water dump valve leaking during the freeze

cycle, a system low on charge, and a starving TXV have

similar symptoms.

Water system problems must be identified and eliminated

prior to replacing refrigeration components.

Water area (evaporator) is dirty

• Descale as needed

Water inlet pressure not between 20 and 80 psig (1–5 bar,

138–552 kPa)

• Install a water regulator valve or increase the water

pressure

Incoming water temperature is not between 40°F (3°C)

and 90°F (32°C)

• If too hot, check the hot water line check valves in

other store equipment

Water filtration is plugged (if used)

• Install a new water filter

102 - UnderCounter Part Number 000019553 Rev 00 04/26

Vent tube is not installed on water outlet drain

• See Installation Instructions

Hoses, fittings, etc., are leaking water

• Repair/replace as needed

Water valve is stuck open, closed or is leaking

• Descale/replace as needed

Water is spraying out of the sump trough area

• Stop the water spray

Uneven water flow across the evaporator

• Descale the ice machine

Water is freezing behind the evaporator

• Correct the water flow

Plastic extrusions and gaskets are not secured to the

evaporator

• Remount/replace as need.

Part Number 000019553 Rev 00 04/26 UnderCounter - 103

ICE FORMATION PATTERN

Evaporator ice formation pattern analysis is helpful in ice

machine diagnostics.

Analyzing the ice formation pattern alone cannot diagnose

an ice machine malfunction. However, when this analysis

is used along with Manitowoc’s Refrigeration System

Operational Analysis Table, it can help diagnose an ice

machine malfunction.

OUTLET

INLET

OUTLET

INLET

KP0150

KP0250

Examples of Evaporator Tubing Routing

Normal Ice Formation

Ice forms across the entire evaporator surface.

At the beginning of the Freeze cycle, it may appear that

more ice is forming on the inlet of the evaporator than at

the outlet. At the end of the Freeze cycle, ice formation

at the outlet will be close to, or just a bit thinner than,

ice formation at the inlet. The dimples in the cubes at the

outlet of the evaporator may be more pronounced than

those at the inlet. This is normal.

If ice forms uniformly across the evaporator surface, but

does not do so in the proper amount of time, this is still

considered a normal ice fill pattern.

104 - UnderCounter Part Number 000019553 Rev 00 04/26

Extremely Thin at Evaporator Outlet

There is no ice, or a considerable lack of ice formation on

the outlet of the evaporator.

Examples: No ice at all at the outlet of the evaporator, but

ice forms at the inlet half of the evaporator. Or, the ice at

the outlet of the evaporator reaches the correct thickness,

but the outlet of the evaporator already has 1/2” to 1” of

ice formation.

Possible cause: Water loss, low on refrigerant, starving TXV,

hot water supply, faulty float valve, etc.

Extremely Thin at Evaporator Inlet

There is no ice, or a considerable lack of ice formation at

the inlet of the evaporator. Examples: The ice at the outlet

of the evaporator reaches the correct thickness, but there

is no ice formation at all at the inlet of the evaporator.

Possible cause: Insufficient water flow, flooding TXV, etc.

Spotty Ice Formation

There are small sections on the evaporator where there is

no ice formation. This could be a single corner, or a single

spot in the middle of the evaporator. This is generally

caused by loss of heat transfer from the tubing on the

backside of the evaporator.

No Ice Formation

The ice machine operates for an extended period, but

there is no ice formation at all on the evaporator.

Possible cause: Water float valve, water pump, starving

expansion valve, low refrigerant charge, compressor, etc.

Part Number 000019553 Rev 00 04/26 UnderCounter - 105

ANALYZING DISCHARGE PRESSURE

1. Determine the ice machine operating conditions:

Air temperature entering condenser ______

Air temperature around ice machine ______

Water temperature entering sump trough ______

2. Refer to “Installation/Visual Inspection Checklist” on

page 101 for ice machine being checked.

Use the operating conditions determined in step 1 to find

the published normal discharge pressures.

Freeze Cycle ______

Harvest Cycle ______

3. Perform an actual discharge pressure check.

Freeze Cycle

PSIG

Harvest Cycle

PSIG

Beginning of

Cycle __________ __________

Middle of

Cycle __________ __________

End of

Cycle __________ __________

4. Compare the actual discharge pressure (Step 3) with

the published discharge pressure (Step 2).

The discharge pressure is normal when the actual

pressure falls within the published pressure range for the

ice machine’s operating conditions. It is normal for the

discharge pressure to be higher at the beginning of the

freeze cycle (when load is greatest), then drops throughout

the freeze cycle.

106 - UnderCounter Part Number 000019553 Rev 00 04/26

Discharge Pressure High Checklist

Improper Installation

• Refer to “Installation/Visual Inspection Checklist” on

page 101

Restricted Condenser Air Flow

• High inlet air temperature

• Condenser discharge air re-circulation

• Dirty condenser fins

• Defective fan cycling control

• Defective fan motor

Improper Refrigerant Charge

• Overcharged

• Non-condensible in system

• Wrong type of refrigerant

Other

• Non-Manitowoc components in system

• High side refrigerant lines/component restricted

(before mid-condenser)

Freeze Cycle Discharge Pressure Low Checklist

Improper Installation

• Refer to “Installation/Visual Inspection Checklist” on

page 101

Improper Refrigerant Charge

• Undercharged

• Wrong type of refrigerant

Other

• Non-Manitowoc components in system

• High side refrigerant lines/component restricted

(before mid-condenser)

• Defective fan cycle control

Part Number 000019553 Rev 00 04/26 UnderCounter - 107

ANALYZING SUCTION PRESSURE

The suction pressure gradually drops throughout the

freeze cycle. The actual suction pressure (and drop rate)

changes as the air and water temperature entering the

ice machine changes. These variables also determine the

freeze cycle times.

To analyze and identify the proper suction pressure drop

throughout the freeze cycle, compare the published

suction pressure to the published freeze cycle time.

NOTE: Analyze discharge pressure before analyzing suction

pressure. High or low discharge pressure may be causing

high or low suction pressure.

Procedure

Step

1. Determine the ice machine operating conditions.

Example:

Air temperature entering condenser: 90°F/32.2°C

Air temperature around ice machine: 80°F/26.7°C

Water temperature entering water fill valve: 70°F/21.1°C

2A. Refer to “Cycle Time” and “Operating Pressure” charts for ice

machine model being checked. Using operating conditions from

Step 1, determine published freeze cycle time and published

freeze cycle suction pressure.

Example:

Published freeze cycle time: 14.8 - 15.9 minutes

Published freeze cycle suction pressure: 65 - 26 psig

2B. Compare the published freeze cycle time and published

freeze cycle suction pressure. Develop a chart.

Example:

Published Freeze Cycle Time (minutes)

1 2 4 7 10 12 14

|||||||

65 55 47 39 34 30 26

Published Freeze Cycle Suction Pressure (psig)

In the example, the proper suction pressure should be

approximately 39 psig at 7 minutes; 30 psig at 12 minutes; etc.

108 - UnderCounter Part Number 000019553 Rev 00 04/26

Step

3. Perform an actual suction pressure check at the beginning,

middle and end of the freeze cycle. Note the times at which the

readings are taken.

Example:

Manifold gauge set was connected to the example ice machine

and suction pressure readings taken as follows: ________ PSIG

Beginning of freeze cycle: 79 (at 1 min.)

Middle of freeze cycle: 48 (at 7 min.)

End of freeze cycle: 40 (at 14 min.)

4. Compare the actual freeze cycle suction pressure (Step 3)

to the published freeze cycle time and pressure comparison

(Step 2B). Determine if the suction pressure is high, low or

acceptable.

Example:

In this example, the suction pressure is considered high

throughout the freeze cycle. It should have been:

Approximately 65 psig (at 1 minute) – not 79

Approximately 39 psig (at 7 minutes) – not 48

Approximately 26 psig (at 14 minutes) – not 40

Part Number 000019553 Rev 00 04/26 UnderCounter - 109

Suction Pressure High Checklist

Improper Installation

• Refer to “Installation/Visual Inspection Checklist” on

page 101

Discharge Pressure

• Discharge pressure is too high, and is affecting suction

pressure, refer to “Discharge Pressure High Checklist”

on page 106.

Improper Refrigerant Charge

• Overcharged

• Wrong type of refrigerant

• Non-condensible in system

Other

• Non-Manitowoc components in system

• Harvest valve leaking

• TXV flooding (check bulb mounting)

• Defective compressor

110 - UnderCounter Part Number 000019553 Rev 00 04/26

Suction Pressure Low Checklist

Improper Installation

• Refer to “Installation/Visual Inspection Checklist” on

page 101

Discharge Pressure

• Discharge pressure is too low, and is affecting suction

pressure, refer to “Freeze Cycle Discharge Pressure

Low Checklist” on page 106.

Improper Refrigerant Charge

• Undercharged

• Wrong type of refrigerant

Other

• Non-Manitowoc components in system

• Improper water supply over evaporator refer to

”Water System Checklist” on page 101.

• Loss of heat transfer from tubing on back side of

evaporator

• Restricted/plugged liquid line drier

• Restricted/plugged tubing in suction side of

refrigeration system

• TXV starving

NOTE: Do not limit your diagnosis to only the items listed

in the checklists.

Part Number 000019553 Rev 00 04/26 UnderCounter - 111

HARVEST VALVE

General

The harvest valve is an electrically operated valve that

opens when energized, and closes when de-energized.

Normal Operation

The valve is de-energized (closed) during the freeze cycle

and energized (open) during the harvest cycle. The valve is

positioned between the receiver and the evaporator and

performs two functions:

1. Prevents refrigerant from entering the evaporator

during the freeze cycle.

The harvest valve is not used during the freeze cycle.

The harvest valve is de-energized (closed) preventing

refrigerant flow from the receiver into the evaporator.

2. Allows refrigerant vapor to enter the evaporator in

the harvest cycle.

During the harvest cycle, the harvest valve is

energized (open) allowing refrigerant gas from the

discharge line of the compressor to flow into the

evaporator. The heat is absorbed by the evaporator

and allows release of the ice slab.

Exact pressures vary according to ambient temperature

and ice machine model. Harvest pressures can be found

in the “Cycle Times, 24 Hr. Ice Production and Refrigerant

Pressure Charts” on page 209.

112 - UnderCounter Part Number 000019553 Rev 00 04/26

Harvest Valve Analysis

The valve can fail in two positions:

• Valve will not open in the harvest cycle.

• Valve remains open during the freeze cycle.

VALVE WILL NOT OPEN IN THE HARVEST CYCLE

Although the circuit board has initiated a harvest cycle,

the evaporator temperature remains unchanged from the

freeze cycle.

VALVE REMAINS OPEN IN THE FREEZE CYCLE:

Symptoms of a harvest valve remaining partially open

during the freeze cycle can be similar to symptoms of

an expansion valve, float valve or compressor problem.

Symptoms are dependent on the amount of leakage in the

freeze cycle.

A small amount of leakage will cause increased freeze

times and an ice fill pattern that is “Thin at the Outlet”, but

fills in at the end of the cycle.

As the amount of leakage increases the length of the

freeze cycle increases and the amount of ice at the outlet

of the evaporator decreases.

Refer to the Parts Manual for proper valve application. If

replacement is necessary, use only “original” Manitowoc

replacement parts.

Part Number 000019553 Rev 00 04/26 UnderCounter - 113

Use the following procedure and table to help determine

if a harvest valve is remaining partially open during the

freeze cycle.

1. Wait five minutes into the freeze cycle.

2. Feel the inlet of the harvest valve(s).

Important

Feeling the harvest valve outlet or across the harvest

valve itself will not work for this comparison.

The harvest valve outlet is on the suction side (cool

refrigerant). It may be cool enough to touch even if the

valve is leaking.

3. Feel the compressor discharge line.

Warning

The inlet of the harvest valve and the compressor

discharge line could be hot enough to burn your hand.

Just touch them momentarily.

4. Compare the temperature of the inlet of the harvest

valves to the temperature of the compressor

discharge line.

114 - UnderCounter Part Number 000019553 Rev 00 04/26

Findings Comments

The inlet of the harvest valve

is cool enough to touch and

the compressor discharge

line is hot.

Cool & Hot

This is normal as the discharge

line should always be too hot to

touch and the harvest valve inlet,

although too hot to touch during

harvest, should be cool enough

to touch after 5 minutes into the

freeze cycle.

The inlet of the harvest

valve is hot and approaches

the temperature of a hot

compressor discharge line.

Hot & Hot

This is an indication something is

wrong, as the harvest valve inlet

did not cool down during the

freeze cycle. If the compressor

dome is also entirely hot, the

problem is not a harvest valve

leaking, but rather something

causing the compressor (and the

entire ice machine) to get hot.

Both the inlet of the harvest

valve and the compressor

discharge line are cool

enough to touch.

Cool & Cool

This is an indication something is

wrong, causing the compressor

discharge line to be cool to the

touch. This is not caused by a

harvest valve leaking.

5. Record your findings on the table.

Part Number 000019553 Rev 00 04/26 UnderCounter - 115

COMPARING EVAPORATOR INLET/OUTLET

TEMPERATURES

The temperatures of the suction lines entering and leaving

the evaporator alone cannot diagnose an ice machine.

However, comparing these temperatures during the freeze

cycle, along with using Manitowoc’s Refrigeration System

Operational Analysis Table, can help diagnose an ice

machine malfunction.

The actual temperatures entering and leaving the

evaporator vary by model, and change throughout the

freeze cycle. This makes documenting the “normal”

inlet and outlet temperature readings difficult. The key

to the diagnosis lies in the difference between the two

temperatures five minutes into the freeze cycle. These

temperatures must be within 7°F (4°C) of each other.

Use this procedure to document freeze cycle inlet and

outlet temperatures.

1. Use a quality temperature meter, capable of taking

temperature readings on curved copper lines.

2. Attach the temperature meter sensing device to the

copper lines entering and leaving the evaporator.

Important

Do not simply insert the sensing device under the

insulation. It must be attached to and reading the

actual temperature of the copper line.

3. Wait five minutes into the freeze cycle.

4. Record the temperatures below and determine the

difference between them.

___________ ___________ ___________

Inlet Temperature Difference must be within

7°F (4°C) at 5 minutes into

the freeze cycle

Outlet

Temperature

5. Use this with other information gathered on the

Refrigeration System Operational Analysis Table to

determine the ice machine malfunction.

116 - UnderCounter Part Number 000019553 Rev 00 04/26

DISCHARGE LINE TEMPERATURE ANALYSIS

GENERAL

Knowing if the discharge line temperature is increasing,

decreasing or remaining constant can be an important

diagnostic tool. Maximum compressor discharge line

temperature on a normally operating ice machine steadily

increases throughout the freeze cycle. Comparing the

temperatures over several cycles will result in a consistent

maximum discharge line temperature.

Ambient air temperatures affect the maximum discharge

line temperature.

Higher ambient air temperatures at the condenser = higher

discharge line temperatures at the compressor.

Lower ambient air temperatures at the condenser = lower

discharge line temperatures at the compressor.

Regardless of ambient temperature, the freeze cycle

discharge line temperature will be higher than 150°F (66°C)

on a normally operating ice machine.

PROCEDURE

Connect a temperature probe on the compressor discharge

line within 6” (15.2 cm) of the compressor. Observe the

discharge line temperature for the last three minutes of

the freeze cycle and record the maximum discharge line

temperature.

Part Number 000019553 Rev 00 04/26 UnderCounter - 117

Discharge Line Temperature Above 150°F (66°C) at End of

Freeze Cycle:

Ice machines that are operating normally will have

consistent maximum discharge line temperatures above

150°F (66°C).

Verify the expansion valve sensing bulb is positioned and

secured correctly.

Discharge Line Temperature Below 150°F (66°C) at End of

Freeze Cycle

Ice machines that have a flooding expansion valve will have

a maximum discharge line temperature that decreases

each cycle.

Verify the expansion valve sensing bulb is 100% insulated

and sealed airtight. Condenser air contacting an incorrectly

insulated sensing bulb will cause overfeeding of the

expansion valve.

118 - UnderCounter Part Number 000019553 Rev 00 04/26

Final Analysis

The column with the highest number of check marks

identifies the refrigeration problem.

Column 1 – Harvest Valve Leaking

A leaking harvest valve must be replaced.

Column 2 – Low Charge/TXV Starving

Normally, a starving expansion valve only affects the freeze

cycle pressures, not the harvest cycle pressures. A low

refrigerant charge normally affects both pressures. Verify

the ice machine is not low on charge before replacing an

expansion valve.

Add refrigerant charge in 2 oz. increments as a diagnostic

procedure to verify a low charge. (Do not add more than

the total charge of refrigerant). If the problem is corrected,

the ice machine is low on charge. Find the refrigerant leak.

The ice machine must operate with the nameplate charge.

If the leak cannot be found, proper refrigerant procedures

must still be followed. Change the liquid line drier,

evacuate the system and weigh in the proper charge.

If the problem is not corrected by adding charge, the

expansion valve is faulty.

Column 3 – TXV Flooding

A loose or improperly mounted expansion valve bulb

causes the expansion valve to flood. Check bulb mounting,

insulation, etc., before changing the valve.

Column 4 – Compressor

Replace the compressor and start components. To receive

warranty credit, the compressor ports must be properly

sealed by crimping and soldering them closed. Old start

components must be returned with the faulty compressor.

Part Number 000019553 Rev 00 04/26 UnderCounter - 119

SYMPTOM #3

Ice Machine Will Not Harvest – Freeze Cycle Is Normal

and Ice Cubes Are Not Melted After Harvest

Head

Pressure is

High,

Sucon

Pressure is

Low

in Harvest?

(Refer

Pressure Charts)

YES

Harvest

Valve

is Energized? NO

Refer

to Symptom

Freeze

Cycle

Operaonal Analysis

Table

Low

Producon,

Normal

Fill Paern, Long

Harvest

Cycle,

Possible

SL #2, Back of Cubes

Are Not Melted

Discharge

line temperature is

greater

than

150°F at

the

end

of the freeze cycle?

Refer

Sequence

Operaon

and

Wiring

Diagram

YES

Replace

Harvest

Valve

120 - UnderCounter Part Number 000019553 Rev 00 04/26

YES

Fan

Cycling

Control Opens below setpoint

harvest

cycle?

Self Contained

Air

cooled

Condenser?

Self Contained

Watercooled Condenser?

Fan

cycling

Control

operates

correctly

in freeze cycle?

Replace Fan Cycling

Control

YESYES

Stops water

ﬂow 100%

in harvest cycle?

Maintains

correct

pressure in freeze cycle?

Adjust or Replace

Water Regulang

Valve

YES

Are

you

sure

Discharge Line

Temperature

Normal?

Repeat this ﬂowchart

and verify all data

Part Number 000019553 Rev 00 04/26 UnderCounter - 121

SYMPTOM #4

Ice Machine Will Not Harvest – Freeze Cycle is Normal

and Ice Cubes Are Not Melted After Harvest

Is Ice Machine

level?

YES

Refer to

Symptom #3 Ice

Machine will Not

Harvest

Does ice remain frozen to

the evaporator at the end of

the harvest cycle?

Level Ice

Machine

START

Are back of the cubes

melted at end of harvest

cycle?

YES

Is the evaporator dirty or damaged?

(Dry evaporator first then check)

Dents, loose partitions or

plating issues

122 - UnderCounter Part Number 000019553 Rev 00 04/26

YES

Refer to Manual

Cleaning Procedure

Refer to Symptom #2 Freeze

Cycle Operational Analysis

Table

Refer to Heavily Scaled

Cleaning Procedure

Discharge line temperature is greater

than

150ºF at the end of the freeze cycle?

Are ice thickness, cycle times

and slab weights correct?

*A damaged

evaporator

may

not

repairable.

For

example:

the

top

molding

assembly

replaceable

however the side moldings

and/or

the evaporator

grid

is not repairable.

Part Number 000019553 Rev 00 04/26 UnderCounter - 123

INSTALLATION/VISUAL INSPECTION CHECKLIST

Ice machine is not level

• Level the ice machine

Condenser is dirty

• Clean the condenser

Water filtration is plugged (if used)

• Install a new water filter

Water drains are not run separately and/or are not

vented

• Run and vent drains according to the Installation

Manual

124 - UnderCounter Part Number 000019553 Rev 00 04/26

WATER SYSTEM CHECKLIST

A water-related problem often causes the same symptoms

as a refrigeration system component malfunction.

Water system problems must be identified and eliminated

prior to replacing refrigeration components.

Water area (evaporator) is dirty

• Descale as needed

Water inlet pressure not between 20 and 80 psig (1–5 bar,

138–552 kPa)

• Install a water regulator valve or increase the water

pressure

Incoming water temperature is not between 40°F (3°C)

and 90°F (32°C)

• If too hot, check the hot water line check valves in

other store equipment

Water filtration is plugged (if used)

• Install a new water filter

Vent tube is not installed on water outlet drain

• See Installation Instructions

Hoses, fittings, etc., are leaking water

• Repair/replace as needed

Water valve is stuck open, closed or is leaking

• Descale/replace as needed

Continued Next Page

Part Number 000019553 Rev 00 04/26 UnderCounter - 125

Water is spraying out of the sump trough area

• Stop the water spray

Water is leaking through the sump trough overflow

• Set the water level 1/4”-3/8” below standpipe

Uneven water flow across the evaporator

• Descale the ice machine

Water is freezing behind the evaporator

• Correct the water flow

Plastic extrusions and gaskets are not secured to the

evaporator

• Remount/replace as needed.

126 - UnderCounter Part Number 000019553 Rev 00 04/26

K & KF MODELS

SERVICE LIMIT FEATURE

In addition to the standard safety controls, your Koolaire

ice machine features built-in service limits that will stop

the ice machine if conditions arise which could cause a

major component failure.

Before calling for service, re-start the ice machine using

the following procedure:

1. Move the ON/OFF/WASH switch to OFF and then back

to ON.

2. If the service limit feature has stopped the ice

machine, it will restart after a short delay. Proceed to

step 4.

3. If the ice machine does not restart, see “Ice machine

does not operate”.

4. Allow the ice machine to run to determine if the

condition is reoccurring.

A. If the ice machine stops again, the condition has

reoccurred. Call for service.

B. If the ice machine continues to run, the condition

has corrected itself. Allow the ice machine to

continue running.

Part Number 000019553 Rev 00 04/26 UnderCounter - 127

Service Limit #1: If the freeze time reaches 60 minutes,

the control board automatically initiates a harvest cycle. 3

cycles outside the time limit = 1 hour Stand-by Mode.

Service Limit #2: If the harvest time reaches 3.5 minutes,

the control board automatically returns the ice machine to

the freeze cycle. 3 cycles outside the time limit = Service

Limit (must be MANUALLY reset).

Service Limit Stand-by Mode: The first time a service limit

shut down occurs, the ice machine turns off for 60 minutes

(Stand-by Mode). The ice machine will then automatically

restart to see if the problem reoccurs. During the Stand-

by Mode the harvest light will be flashing continuously

and a service limit indication can be viewed. If the same

service limit is reached a second time (the problem has

reoccurred), the ice machine will initiate a service limit

shut down and remain off until it is manually restarted.

During a service limit shut down the harvest light will be

flashing continuously.

Determining Which Service Limit Stopped the Ice

Machine: When a service limit condition causes the

ice machine to stop, the harvest light on the control

board continually flashes on and off. Use the following

procedures to determine which service limit has stopped

the ice machine.

1. Move the toggle switch to OFF.

2. Move the toggle switch back to ON.

3. Watch the harvest light. It will flash one or two times,

corresponding to service limits 1 and 2, to indicate

which service limit stopped the ice machine.

After service limit indication, the ice machine will restart

and run until a service limit is exceeded again.

128 - UnderCounter Part Number 000019553 Rev 00 04/26

Service Limit Notes

• A service limit indication is completed before the

water pump starts. Water contacting the ice thickness

probe in the freeze cycle will cause the harvest light

to flash. Do not mistake a harvest light flashing in the

freeze cycle with a service limit indication.

• A continuous run of 100 harvests automatically erases

the service limit code.

• The control board will store and indicate only one

service limit – the last one exceeded.

• If the toggle switch is moved to the OFF position and

then back to the ON position prior to reaching the

100-harvest point, the last service limit exceeded will

be indicated.

• If the harvest light did not flash prior to the ice

machine restarting, then the ice machine did not stop

because it exceeded a service limit.

Part Number 000019553 Rev 00 04/26 UnderCounter - 129

ANALYZING WHY SERVICE LIMITS MAY STOP THE ICE

MACHINE

According to the refrigeration industry, a high percentage

of compressor failure is a result of external causes. These

can include flooding or starving expansion valves, dirty

condensers, water loss to the ice machine, etc. The service

limits protect the ice machine (primarily the compressor)

from external failures by stopping ice machine operation

before major component damage occurs.

The service limit system is similar to a high-pressure cutout

control. It stops the ice machine, but does not tell what

is wrong. The service technician must analyze the system

to determine what caused the high-pressure cutout, or a

particular service limit, to stop the ice machine.

The service limits are designed to stop the ice machine

prior to major component failures, most often a minor

problem or something external to the ice machine. This

may be difficult to diagnose, as many external problems

occur intermittently.

Example: An ice machine stops intermittently on service

limit #1 (long freeze times). The problem could be a low

ambient temperature at night, a water pressure drop; the

water is turned off one night a week, etc.

When a high-pressure cutout or a service limit stops the

ice machine, they are doing what they are supposed

to do. That is, stopping the ice machine before a major

component failure occurs.

Refrigeration and electrical component failures may also

trip a service limit. Eliminate all electrical components and

external causes first. If it appears that the refrigeration

system is causing the problem, use the Refrigeration

System Operational Analysis Table, along with detailed

charts, checklists, and other references to determine the

cause.

130 - UnderCounter Part Number 000019553 Rev 00 04/26

Service Limit Checklist

The following checklists are designed to assist the service

technician in analysis. However, because there are many

possible external problems, do not limit your diagnosis to

only the items listed.

Service Limit #1

Freeze time exceeds 60 minutes for 6 consecutive freeze

cycles.

Possible Cause Checklist

Improper Installation

• Refer to “Installation and Visual Inspection Checklist”

on page 147

Water System

• Water Level set too high (water escaping through over

flow tube)

• Low water pressure (20 psig min.)

• High water pressure (80 psig max.)

• High water temperature (90°F/32.2°C max.)

• Clogged water distribution tube

• Dirty/defective float valve

• Defective water pump

Electrical System

• Ice thickness probe out of adjustment

• Harvest cycle not initiated electrically

• Compressor relay not energizing

• Compressor electrically non-operational

• High inlet air temperature (110°F/43.3°C max.)

• Defective fan cycling control

• Defective fan motor

• Dirty condenser

Part Number 000019553 Rev 00 04/26 UnderCounter - 131

Refrigeration System

• Restricted condenser air flow

• Condenser discharge air re-circulation

• Dirty condenser fins

• Non-OEM components

• Improper refrigerant charge

• Defective compressor

• TXV starving or flooding (check bulb mounting)

• Non-condensible in refrigeration system

• Plugged or restricted high side refrigerant lines or

component

• Defective harvest valve

132 - UnderCounter Part Number 000019553 Rev 00 04/26

Service Limit #2

Harvest time exceeds 3.5 minutes for 6 Consecutive

harvest cycles.

Possible Cause Checklist

Improper Installation

• Refer to “Installation and Visual Inspection Checklist”

on page 147.

Water System

• Water area (evaporator) dirty

• Dirty/defective water dump valve

• Vent tube not installed on water outlet drain

• Water freezing behind evaporator

• Plastic extrusions and gaskets not securely mounted to

the evaporator

• Low water pressure (20 psig min.)

• Loss of water from sump area

• Clogged water distribution tube

• Dirty/defective float valve

• Defective water pump

Electrical System

• Ice thickness probe out of adjustment

• Ice thickness probe dirty

• Bin switch defective

• Premature harvest

Refrigeration System

• Non-OEM components

• Improper refrigerant charge

• Defective harvest valve

• TXV flooding (check bulb mounting)

• Defective fan cycling control

Part Number 000019553 Rev 00 04/26 UnderCounter - 133

DIAGNOSING AN ICE MACHINE THAT WILL NOT RUN

Warning

High (line) voltage is applied to the control board

(terminals #2 and #4) at all times. Removing control

board fuse or moving the toggle switch to OFF will not

remove the power supplied to the control board.

1. Verify primary voltage is supplied to ice machine and

the fuse/circuit breaker is closed.

2. Verify control board fuse is okay.

3. If the bin switch light functions, the fuse is okay.

4. Verify the bin switch functions properly. A defective

bin switch can falsely indicate a full bin of ice.

5. Verify ON/OFF/WASH toggle switch functions

properly. A defective toggle switch may keep the ice

machine in the OFF mode.

6. Verify low DC voltage is properly grounded. Loose

DC wire connections may intermittently stop the ice

machine.

7. Replace the control board.

8. Be sure Steps 1 – 5 were followed thoroughly.

Intermittent problems are not usually related to the

control board.

134 - UnderCounter Part Number 000019553 Rev 00 04/26

Troubleshooting By Symptom

The troubleshooting procedures follow diagnostic charts.

There are four symptoms, the symptom that you are

experiencing will determine which diagnostic chart to

use. The chart asks yes and no questions to determine

the problem. The diagnostic chart will direct you to a

procedure to correct the problem.

SYMPTOM #1

Ice Machine Stops Running

Ice machine is in Ice Making cycle

Has a History of Shutting Down

• Refer to Ice Machine Stops Running diagnostic chart

SYMPTOM #2

Ice Machine has a Long Freeze Cycle

Ice Formation is Thick

Thin Ice Fill on Inlet or Outlet of Evaporator

Low Production

Service Fault (possible)

• Refer to Freeze Cycle Refrigeration System Operational

Analysis Table

SYMPTOM #3

Ice Machine Will Not Harvest - Freeze Cycle is Normal and

Ice Cubes are Not Melted After Harvest

Long Harvest (possible)

• Refer to Refrigeration Harvest Flow Chart

SYMPTOM #4

Ice Machine Will Not Harvest - Freeze Cycle is Normal and

Ice Cubes are Melted After Harvest

• Refer to Ice Meltout Flow Chart

Part Number 000019553 Rev 00 04/26 UnderCounter - 135

SYMPTOM #1

Ice Machine stops running or has history of shutting down

YES

Refer to “Diagnosing an Ice

Machine that Will Not Run”

Does Ice Machine run in

Clean?

Control board has

energized lights?

Ice Machine starts when

Toggle Switch is moved to

ICE?

136 - UnderCounter Part Number 000019553 Rev 00 04/26

YES

How many mes did the Harvest

LED light ﬂash aer reseng the

toggle switch?

Refer to Safety Limit #1

Long Freeze Cycle

Refer to Safety Limit #2

Long Harvest Cycle

Install Ice Damper

Replace The Ice Damper

Run machine & check

for Normal Operaon

Is the Ice Damper magnet

aached?

Refer to Bin

Switch

Diagnoscs

SL1/Harvest Light

(Once)

SL2/Harvest Light

(Twice)

YES

Is the Ice Damper in

place?

Part Number 000019553 Rev 00 04/26 UnderCounter - 137

#2  LOW PRODUCTION, LONG FREEZE CYCLE

Ice Machine has a Long Freeze Cycle

Ice Formation is Thick

Thin on Inlet or Outlet of Evaporator

Low Production

How to Use the Freeze Cycle Refrigeration System

Operational Analysis Table

GENERAL

These tables must be used with charts, checklists and

other references to eliminate refrigeration components

not listed on the tables and external items and problems

which can cause good refrigeration components to appear

defective.

The tables list five different defects that may affect the ice

machine’s operation.

NOTE: A low-on-charge ice machine and a starving

expansion valve have very similar characteristics and are

listed under the same column.

NOTE: Before starting, see “Before Beginning Service” for

a few questions to ask when talking to the ice machine

owner.

PROCEDURE

Step 1 Complete the “Operation Analysis” column.

Read down the left “Operational Analysis” column.

Perform all procedures and check all information listed.

Each item in this column has supporting reference material

to help analyze each step.

While analyzing each item separately, you may find an

“external problem” causing a good refrigerant component

to appear bad. Correct problems as they are found. If

the operational problem is found, it is not necessary to

complete the remaining procedures.

138 - UnderCounter Part Number 000019553 Rev 00 04/26

Step 2 Enter Checkmarks ().

Each time the actual findings of an item in the

“Operational Analysis” column matches the published

findings on the table, enter a Checkmark.

Example: Freeze cycle suction pressure is determined to be

low. Enter a Checkmark in the “low” column.

Step 3 Add the Checkmarks listed under each of

the four columns. Note the column number

with the highest total and proceed to “Final

Analysis.”

NOTE: If two columns have matching high numbers,

a procedure was not performed properly, supporting

material was not analyzed correctly or the problem

component is not covered by the analysis table.

Before Beginning Service

Ice machines may experience operational problems

only during certain times of the day or night. A machine

may function properly while it is being serviced, but

malfunctions later. Information provided by the user can

help the technician start in the right direction, and may be

a determining factor in the final diagnosis.

Ask these questions before beginning service:

• When does the ice machine malfunction? (night, day,

all the time, only during the Freeze cycle, etc.)

• When do you notice low ice production? (one day a

week, every day, on weekends, etc.)

• Can you describe exactly what the ice machine seems

to be doing?

• Has anyone been working on the ice machine?

• During “store shutdown,” is the circuit breaker, water

supply or air temperature altered?

• Is there any reason why incoming water pressure

might rise or drop substantially?

Part Number 000019553 Rev 00 04/26 UnderCounter - 139

SYMPTOM #2  REFRIGERATION COMPONENT DIAGNOSTIC CHART

Operational Analysis 1 2 3 4

Ice Production

Published 24 hour ice production________________

Calculated (actual) 24 hour ice production_______________

NOTE: The ice machine is operating properly if the ice fill pattern is normal and ice production is within

10% of charted capacity.

Installation and Water

System

All installation and water related problems must be corrected

before proceeding with chart.

Ice Formation Pattern Ice formation is

extremely thin on top of

evaporator

-or-

No ice formation on the

entire evaporator

Ice formation extremely

thin on top of the

evaporator

-or-

No ice formation on

entire evaporator

Ice formation is normal

-or-

Ice formation is

extremely thin on the

bottom of evaporator

-or-

no ice formation on

evaporator

Ice formation is normal

-or-

No ice formation on

entire evaporator

140 - UnderCounter Part Number 000019553 Rev 00 04/26

Operational Analysis 1 2 3 4

Service Limits

Refer to “Analyzing Service

Limits” to eliminate all non-

refrigeration problems.

Stops on service limit:

1 or 2

Stops on service limit:

1 or 2

Stops on service limit:

Freeze Cycle

Discharge Pressure

________ ______ ______

1 minute Middle End

into cycle

If discharge pressure is High or Low, refer to freeze cycle high or low discharge pressure problem checklist

to eliminate problems and/or components not listed on this table before proceeding.

Freeze Cycle Suction Pressure

________ ______ ______

1 minute Middle End

If suction pressure is High or Low refer to freeze cycle high or low suction pressure problem checklist to

eliminate problems and/or components not listed on this table before proceeding.

Suction pressure is

High

Suction pressure is

Low

Suction pressure is

High

Suction pressure is

High

Part Number 000019553 Rev 00 04/26 UnderCounter - 141

Operational Analysis 1 2 3 4

Harvest Valve

The harvest valve

inlet is

HOT

and

The compressor

discharge line is

HOT

The harvest valve

inlet is

COOL

and

The compressor

discharge line is

HOT

The harvest valve

inlet is

COOL

and

The compressor

discharge line is

COOL

The harvest valve

inlet is

COOL

and

The compressor

discharge line is

HOT

Discharge Line Temp.

Record freeze cycle discharge

line temp at the end of freeze

cycle.

Discharge line temp

150°F (66°C) or higher at

the end of freeze cycle

Discharge line temp

150°F (66°C) or higher at

the end of freeze cycle

Discharge line temp

less than 150°F (66°C) at

the end of freeze cycle

Discharge line temp

150°F (66°C) or higher at

the end of freeze cycle

Final Analysis

Enter total number of boxes

checked in each column.

Harvest Valve

Leaking

Low On Charge

-or-

TXV Starving

TXV Flooding Compressor

142 - UnderCounter Part Number 000019553 Rev 00 04/26

Diagnosing Ice Thickness Control Circuitry

Ice Machine Does Not Cycle Into Harvest when Water

Contacts the Ice Thickness Control Probe

Step 1 Bypass the freeze time lock-in feature by

moving the ON/OFF/WASH switch to OFF and back to ON.

Wait until the water starts to flow over the evaporator.

Step 2 Clip the jumper wire to the ice thickness probe

and any cabinet ground.

EVAPORATOR

ICE THICKNESS

PROBE

CONNECTION

GROUND

JUMPER WIRE

BIN SWITCH

LIGHT

(GREEN)

HARVEST LIGHT

(RED)

SV1592i

Step 2 Jumper wire connected from probe to ground

Monitoring Harvest Light Correction

The harvest light comes on, and

6-10 seconds later, ice machine

cycles from freeze to harvest.

The ice thickness control

circuitry is functioning properly.

Do not change any parts.

The harvest light comes on but

the ice machine stays in the

freeze sequence.

The ice control circuitry is

functioning properly. The ice

machine is in a six minute

freeze time lock-in. Verify

Step 1 of this procedure was

followed correctly.

The harvest light does not

come on.

Proceed to Step 3.

Part Number 000019553 Rev 00 04/26 UnderCounter - 143

Step 3 Disconnect the ice thickness probe from

the control board terminal. Clip the jumper wire to the

terminal on the control board and any cabinet ground.

Monitor the harvest light.

EVAPORATOR

ICE THICKNESS

PROBE

CONNECTION

GROUND

JUMPER WIRE

BIN SWITCH

LIGHT

(GREEN)

HARVEST LIGHT

(RED)

SV1592J

Step 3 Jumper wire connected from control board terminal to

ground

Monitoring Harvest Light Correction

The harvest light comes on, and

6-10 seconds later, ice machine

cycles from freeze to harvest.

The ice thickness probe is

causing the malfunction.

The harvest light comes on but

the ice machine stays in the

freeze sequence.

The control circuitry is

functioning properly. The ice

machine is in a six-minute

freeze time lock-in (verify step 1

of this procedure was followed

correctly).

The harvest light does not

come on.

The control board is causing the

malfunction.

144 - UnderCounter Part Number 000019553 Rev 00 04/26

Ice Machine Cycles Into Harvest Before Water Contact

with the Ice Thickness Probe

Step 1 Bypass the freeze time lock-in feature by

moving the ON/OFF/WASH switch to OFF and back to ON.

Wait until the water starts to flow over the evaporator,

then monitor the harvest light.

Step 2 Disconnect the ice thickness probe from the

control board terminal.

ICE THICKNESS

PROBE

DISCONNECT

PROBE WIRE

BIN SWITCH

LIGHT

(GREEN)

HARVEST LIGHT

(RED)

SV1592J_2

Step 2 Disconnect probe from control board terminal.

Monitoring Harvest Light Correction

The harvest light stays off and

the ice machine remains in the

freeze sequence.

The ice thickness probe is

causing the malfunction. Verify

that the ice thickness probe is

adjusted correctly.

The harvest light comes on,

and 6-10 seconds later, the ice

machine cycles from freeze to

harvest.

The control board is causing the

malfunction.

Part Number 000019553 Rev 00 04/26 UnderCounter - 145

Ice Production Check

The amount of ice a machine produces directly relates to

the operating water and air temperatures. This means an

ice machine with a 70°F (21.2°C) ambient temperature

and 50°F (10.0°C) water produces more ice than the same

ice machine with 90°F (32.2°C) ambient and 70°F (21.2°C)

water.

1. Determine the ice machine operating conditions:

Air temp entering condenser: ____°

Air temp around ice machine: ____°

Water temp entering sump trough: ____°

2. Refer to the appropriate 24-Hour Ice Production

Chart. Use the operating conditions determined in

step 1 to find published 24-Hour Ice Production:_____

• Times are in minutes.

Example: 1 min. 15 sec. converts to 1.25 min.

(15 seconds ÷ 60 seconds = .25 minutes)

• Weights are in pounds.

Example: 2 lb. 6 oz. converts to 2.375 lb.

(6 oz. ÷ 16 oz. = .375 lb.)

3. Perform an ice production check using the formula

below.

1. _________

Freeze Time

+ _________

Harvest Time

= _________

Total Cycle

Time

2. 1440

_________

Minutes in 24

Hrs.

÷ _________

Total Cycle

Time

= _________

Cycles per Day

3. _________

Weight of One

Harvest

× _________

Cycles per Day

= _________

Actual 24-Hour

Production

146 - UnderCounter Part Number 000019553 Rev 00 04/26

Weighing the ice is the only 100% accurate check.

However, if the ice pattern is normal and the 1/8" (3.2 mm)

thickness is maintained, the ice slab weights listed with the

24-Hour Ice Production Charts may be used.

4. Compare the results of step 3 with step 2. Ice

production is normal when these numbers match

closely. If they match closely, determine if:

• Another larger ice machine is required.

• Relocating the existing equipment to lower the

load conditions is required.

Contact the local distributor for information on available

options and accessories.

Part Number 000019553 Rev 00 04/26 UnderCounter - 147

Installation and Visual Inspection Checklist

Ice machine is not level

Level the ice machine

Condenser is dirty

• Clean the condenser

Water filtration is plugged (if used)

• Install a new water filter

Water drains are not run separately and/or are not

vented

• Run and vent drains according to the Installation

Manual

148 - UnderCounter Part Number 000019553 Rev 00 04/26

Water System Checklist

A water-related problem often causes the same symptoms

as a refrigeration system component malfunction.

Example: A water dump valve leaking during the freeze

cycle, a system low on charge, and a starving TXV have

similar symptoms.

Water system problems must be identified and eliminated

prior to replacing refrigeration components.

Water area (evaporator) is dirty

• Clean as needed

Water inlet pressure not between 20 and 80 psig (1–5 bar,

138–552 kPa)

• Install a water regulator valve or increase the water

pressure

Incoming water temperature is not between 35°F (1.7°C)

and 90°F (32.2°C)

• If too hot, check the hot water line check valves in

other store equipment

Water filtration is plugged (if used)

• Install a new water filter

Part Number 000019553 Rev 00 04/26 UnderCounter - 149

Vent tube is not installed on water outlet drain

• See Installation Instructions

Hoses, fittings, etc., are leaking water

• Repair/replace as needed

Water float valve is stuck open or closed

• Clean/replace as needed

Water is spraying out of the sump trough area

• Stop the water spray

Uneven water flow across the evaporator

• Clean the ice machine

Water is freezing behind the evaporator

• Correct the water flow

Plastic extrusions and gaskets are not secured to the

evaporator

• Remount/replace as needed

150 - UnderCounter Part Number 000019553 Rev 00 04/26

Ice Formation Pattern

Evaporator ice formation pattern analysis is helpful in ice

machine diagnostics.

Analyzing the ice formation pattern alone cannot diagnose

an ice machine malfunction. However, when this analysis

is used along with the Refrigeration System Operational

Analysis Table, it can help diagnose an ice machine

malfunction.

Any number of problems can cause improper ice

formation.

Example: An ice formation that is “extremely thin at the

outlet” could be caused by a hot water supply, water

leaking out the overflow pipe, a faulty water float valve, a

low refrigerant charge, etc.

OUTLET

INLET

OUTLET

INLET

K0170 K0270

Examples of Evaporator Tubing Routing

Normal Ice Formation

Ice forms across the entire evaporator surface.

At the beginning of the Freeze cycle, it may appear that

more ice is forming on the inlet of the evaporator than at

the outlet. At the end of the Freeze cycle, ice formation

at the outlet will be close to, or just a bit thinner than,

ice formation at the inlet. The dimples in the cubes at the

outlet of the evaporator may be more pronounced than

those at the inlet. This is normal.

If ice forms uniformly across the evaporator surface, but

does not do so in the proper amount of time, this is still

considered a normal ice fill pattern.

Part Number 000019553 Rev 00 04/26 UnderCounter - 151

Extremely Thin at Evaporator Outlet

There is no ice, or a considerable lack of ice formation on

the outlet of the evaporator.

Examples: No ice at all at the outlet of the evaporator, but

ice forms at the inlet half of the evaporator. Or, the ice at

the outlet of the evaporator reaches the correct thickness,

but the outlet of the evaporator already has 1/2" to 1"

(12 to 25 mm) of ice formation.

Possible cause: Water loss, low on refrigerant, starving TXV,

hot water supply, faulty float valve, etc.

Extremely Thin at Evaporator Inlet

There is no ice, or a considerable lack of ice formation at

the inlet of the evaporator. Examples: The ice at the outlet

of the evaporator reaches the correct thickness, but there

is no ice formation at all at the inlet of the evaporator.

Possible cause: Insufficient water flow, flooding TXV, etc.

Spotty Ice Formation

There are small sections on the evaporator where there is

no ice formation. This could be a single corner, or a single

spot in the middle of the evaporator. This is generally

caused by loss of heat transfer from the tubing on the

backside of the evaporator.

No Ice Formation

The ice machine operates for an extended period, but

there is no ice formation at all on the evaporator.

Possible cause: Water float valve, water pump, starving

expansion valve, low refrigerant charge, compressor, etc.

152 - UnderCounter Part Number 000019553 Rev 00 04/26

Analyzing Suction Pressure

The suction pressure gradually drops throughout the

freeze cycle. The actual suction pressure (and drop rate)

changes as the air and water temperature entering the

ice machine changes. These variables also determine the

freeze cycle times.

To analyze and identify the proper suction pressure drop

throughout the freeze cycle, compare the published

suction pressure to the published freeze cycle time.

NOTE: Analyze discharge pressure before analyzing suction

pressure. High or low discharge pressure may be causing

high or low suction pressure.

Part Number 000019553 Rev 00 04/26 UnderCounter - 153

Procedure

Step

1. Determine the ice machine operating conditions.

Example:

Air temp. entering condenser: 90°F/32.2°C

Air temp. around ice machine: 80°F/26.7°C

Water temp. entering water fill valve: 70°F/21.1°C

2A. Refer to “Cycle Time” and “Operating Pressure” charts for ice

machine model being checked. Using operating conditions from

Step 1, determine published freeze cycle time and published

freeze cycle suction pressure.

Example:

Published freeze cycle time: 14.8 - 15.9 minutes

Published freeze cycle suction pressure: 65 - 26 psig

2B. Compare the published freeze cycle time and published

freeze cycle suction pressure. Develop a chart.

Example:

Published Freeze Cycle Time (minutes)

1 2 4 7 10 12 14

| | | | | | |

65 55 47 39 34 30 26

Published Freeze Cycle Suction Pressure (psig)

In the example, the proper suction pressure should be

approximately 39 psig at 7 minutes; 30 psig at 12 minutes; etc.

3. Perform an actual suction pressure check at the beginning,

middle and end of the freeze cycle. Note the times at which the

readings are taken.

Example:

Manifold gauge set was connected to the example ice machine

and suction pressure readings taken as follows: ________ PSIG

Beginning of freeze cycle: 79 (at 1 min.)

Middle of freeze cycle: 48 (at 7 min.)

End of freeze cycle: 40 (at 14 min.)

4. Compare the actual freeze cycle suction pressure (Step 3)

to the published freeze cycle time and pressure comparison

(Step 2B). Determine if the suction pressure is high, low or

acceptable.

Example:

In this example, the suction pressure is considered high

throughout the freeze cycle. It should have been:

Approximately 65 psig (at 1 minute) – not 79

Approximately 39 psig (at 7 minutes) – not 48

Approximately 26 psig (at 14 minutes) – not 40

154 - UnderCounter Part Number 000019553 Rev 00 04/26

Suction Pressure High Checklist

Improper Installation

• Refer to “Installation and Visual Inspection Checklist”

on page 147.

Discharge Pressure

• Discharge pressure is too high, and is affecting suction

pressure, refer to “Discharge Pressure High Checklist”

on page 158.

Improper Refrigerant Charge

• Overcharged

• Wrong type of refrigerant

• Non-condensible in system

Other

• Non-OEM components in system

• Harvest valve leaking

• TXV flooding (check bulb mounting)

• Defective compressor

Part Number 000019553 Rev 00 04/26 UnderCounter - 155

Suction Pressure Low Checklist

Improper Installation

• Refer to “Installation and Visual Inspection Checklist”

on page 147.

Discharge Pressure

• Discharge pressure is too low, and is affecting suction

pressure, refer to “Freeze Cycle Discharge Pressure

Low Checklist”

Improper Refrigerant Charge

• Undercharged

• Wrong type of refrigerant

Other

• Non-OEM components in system

• Improper water supply over evaporator refer to

“Water System Checklist” on page 148.

• Loss of heat transfer from tubing on back side of

evaporator

• Restricted/plugged liquid line drier

• Restricted/plugged tubing in suction side of

refrigeration system

• TXV starving

NOTE: Do not limit your diagnosis to only the items listed

in the checklists.

156 - UnderCounter Part Number 000019553 Rev 00 04/26

Comparing Evaporator Inlet and Outlet Temperatures

The temperatures of the suction lines entering and leaving

the evaporator alone cannot diagnose an ice machine.

However, comparing these temperatures during the

freeze cycle, along with using the Refrigeration System

Operational Analysis Table, can help diagnose an ice

machine malfunction.

The actual temperatures entering and leaving the

evaporator vary by model, and change throughout the

freeze cycle. This makes documenting the “normal”

inlet and outlet temperature readings difficult. The key

to the diagnosis lies in the difference between the two

temperatures five minutes into the freeze cycle. These

temperatures must be within 7°F (4°C) of each other.

Use this procedure to document freeze cycle inlet and

outlet temperatures.

1. Use a quality temperature meter, capable of taking

temperature readings on curved copper lines.

1. Attach the temperature meter sensing device to the

copper lines entering and leaving the evaporator.

Important

Do not simply insert the sensing device under the

insulation. It must be attached to and reading the

actual temperature of the copper line.

2. Wait five minutes into the freeze cycle.

3. Record the temperatures below and determine the

difference between them.

___________ ___________ ___________

Inlet Temperature Difference must be within

7°F (4°C) at 5 minutes into

the freeze cycle

Outlet

Temperature

4. Use this with other information gathered on the

Refrigeration System Operational Analysis Table to

determine the ice machine malfunction.

Part Number 000019553 Rev 00 04/26 UnderCounter - 157

Analyzing Discharge Pressure

1. Determine the ice machine operating conditions:

Air temp. entering condenser ______

Air temp. around ice machine ______

Water temp. entering sump trough ______

5. Refer to “Cycle Times, 24 Hr. Ice Production and

Refrigerant Pressure Charts” on page 209 for ice

machine being checked.

Use the operating conditions determined in step 1 to find

the published normal discharge pressures.

Freeze Cycle ______

Harvest Cycle ______

6. Perform an actual discharge pressure check.

Freeze Cycle

PSIG

Harvest Cycle

PSIG

Beginning of

Cycle

__________ __________

Middle of

Cycle

__________ __________

End of

Cycle

__________ __________

7. Compare the actual discharge pressure (step 3) with

the published discharge pressure (step 2).

The discharge pressure is normal when the actual

pressure falls within the published pressure range for the

ice machine’s operating conditions. It is normal for the

discharge pressure to be higher at the beginning of the

freeze cycle (when load is greatest), then drop through out

the freeze cycle.

158 - UnderCounter Part Number 000019553 Rev 00 04/26

Discharge Pressure High Checklist

Improper Installation

• Refer to “Installation and Visual Inspection Checklist”

on page 147.

Restricted Condenser Air Flow

• High inlet air temperature

• Condenser discharge air re-circulation

• Dirty condenser fins

• Defective fan cycling control

• Defective fan motor

Improper Refrigerant Charge

• Overcharged

• Non-condensible in system

• Wrong type of refrigerant

Other

• Non-OEM components in system

• High side refrigerant lines/component

• Restricted (before mid-condenser)

Freeze Cycle Discharge Pressure Low Checklist

Improper Installation

• Refer to “Installation and Visual Inspection Checklist”

on page 147.

Improper Refrigerant Charge

• Undercharged

• Wrong type of refrigerant

Other

• Non-OEM components in system

• High side refrigerant lines/component restricted

(before mid-condenser)

• Defective fan cycle control

NOTE: Do not limit your diagnosis to only the items listed

in the checklists.

Part Number 000019553 Rev 00 04/26 UnderCounter - 159

Harvest Valve

General

The harvest valve is an electrically operated valve that

opens when energized, and closes when de-energized.

Normal Operation

The valve is de-energized (closed) during the freeze cycle

and energized (open) during the harvest cycle. The valve is

positioned between the receiver and the evaporator and

performs two functions:

1. Prevents refrigerant from entering the evaporator

during the freeze cycle.

The harvest valve is not used during the freeze cycle.

The harvest valve is de-energized (closed) preventing

refrigerant flow from the receiver into the evaporator.

8. Allows refrigerant vapor to enter the evaporator in

the harvest cycle.

During the harvest cycle, the harvest valve is

energized (open) allowing refrigerant gas from the

discharge line of the compressor to flow into the

evaporator. The heat is absorbed by the evaporator

and allows release of the ice slab.

Exact pressures vary according to ambient temperature

and ice machine model. Harvest pressures can be found

in the Cycle Time/24 Hour Ice Production/Refrigerant

Pressure Charts in this book.

160 - UnderCounter Part Number 000019553 Rev 00 04/26

Harvest Valve Analysis

The valve can fail in two positions:

• Valve will not open in the harvest cycle.

• Valve remains open during the freeze cycle.

VALVE WILL NOT OPEN IN THE HARVEST CYCLE

Although the circuit board has initiated a harvest cycle,

the evaporator temperature remains unchanged from the

freeze cycle.

Caution

Coil must be seated 100% on solenoid to function

correctly. Install coil with a twisting motion to properly

seat.

VALVE REMAINS OPEN IN THE FREEZE CYCLE:

Symptoms of a harvest valve remaining partially open

during the freeze cycle can be similar to symptoms of

an expansion valve, float valve or compressor problem.

Symptoms are dependent on the amount of leakage in the

freeze cycle.

A small amount of leakage will cause increased freeze

times and an ice fill pattern that is “Thin at the Outlet”, but

fills in at the end of the cycle.

As the amount of leakage increases the length of the

freeze cycle increases and the amount of ice at the outlet

of the evaporator decreases.

Refer to the Parts Manual for proper valve application. If

replacement is necessary, use only “original” replacement

parts.

Part Number 000019553 Rev 00 04/26 UnderCounter - 161

Use the following procedure and table to help determine

if a harvest valve is remaining partially open during the

freeze cycle.

1. Wait five minutes into the freeze cycle.

9. Feel the inlet of the harvest valve.

Important

Feeling the harvest valve outlet or across the harvest

valve itself will not work for this comparison.

The harvest valve outlet is on the suction side (cool

refrigerant). It may be cool enough to touch even if the

valve is leaking.

10. Feel the compressor discharge line.

Warning

The inlet of the harvest valve and the compressor

discharge line could be hot enough to burn your hand.

Just touch them momentarily.

11. Compare the temperature of the inlet of the harvest

valve to the temperature of the compressor discharge

line.

162 - UnderCounter Part Number 000019553 Rev 00 04/26

Findings Comments

The inlet of the harvest valve is

cool enough to touch and the

compressor discharge line is hot.

Cool & Hot

This is normal as the

discharge line should always

be too hot to touch and

the harvest valve inlet,

although too hot to touch

during harvest, should be

cool enough to touch after 5

minutes into the freeze cycle.

The inlet of the harvest valve

is hot and approaches the

temperature of a hot compressor

discharge line.

Hot & Hot

This is an indication

something is wrong, as the

harvest valve inlet did not

cool down during the freeze

cycle. If the compressor

dome is also entirely hot, the

problem is not a harvest valve

leaking, but rather something

causing the compressor (and

the entire ice machine) to

get hot.

Both the inlet of the harvest

valve and the compressor

discharge line are cool enough

to touch.

Cool & Cool

This is an indication

something is wrong, causing

the compressor discharge line

to be cool to the touch. This is

not caused by a harvest valve

leaking.

12. Record your findings on the table.

Part Number 000019553 Rev 00 04/26 UnderCounter - 163

Discharge Line Temperature Analysis

GENERAL

Knowing if the discharge line temperature is increasing,

decreasing or remaining constant can be an important

diagnostic tool. Maximum compressor discharge line

temperature on a normally operating ice machine steadily

increases throughout the freeze cycle. Comparing the

temperatures over several cycles will result in a consistent

maximum discharge line temperature.

Ambient air temperatures affect the maximum discharge

line temperature.

Higher ambient air temperatures at the condenser = higher

discharge line temperatures at the compressor.

Lower ambient air temperatures at the condenser = lower

discharge line temperatures at the compressor.

Regardless of ambient temperature, the freeze cycle

discharge line temperature will be higher than 150°F (66°C)

on a normally operating ice machine.

PROCEDURE

Connect a temperature probe on the compressor discharge

line within 6" (15.2 cm) of the compressor.

Observe the discharge line temperature for the last three

minutes of the freeze cycle and record the maximum

discharge line temperature.

164 - UnderCounter Part Number 000019553 Rev 00 04/26

Discharge Line Temperature Above 150°F (66°C) at End of

Freeze Cycle:

Ice machines that are operating normally will have

consistent maximum discharge line temperatures above

150°F (66°C).

Verify the expansion valve sensing bulb is positioned and

secured correctly.

Discharge Line Temperature Below 150°F (66°C) at End of

Freeze Cycle

Ice machines that have a flooding expansion valve will have

a maximum discharge line temperature that decreases

each cycle.

Verify the expansion valve sensing bulb is 100% insulated

and sealed airtight. Condenser air contacting an incorrectly

insulated sensing bulb will cause overfeeding of the

expansion valve.

Part Number 000019553 Rev 00 04/26 UnderCounter - 165

Ice Quality Is Poor — Cubes are Shallow, Incomplete or

White

Ice machine is dirty

• Clean and sanitize the ice machine

Water filtration is poor

• Replace the filter

Water softener is working improperly (if applicable)

• Repair the water softener

Poor incoming water quality

• Contact a qualified company to test the quality of

the incoming water and make appropriate filter

recommendations

Water escaping from sump during freeze cycle

• Check standpipe and drain

• Check for water tracking out of water circuit

166 - UnderCounter Part Number 000019553 Rev 00 04/26

Freeze Cycle Is Long, Low Ice Production

Water temperature is too high

• Connect to a cold water supply, verify check valves in

faucets and other equipment are functioning correctly

Dirty Condenser

• Clean condenser

High air temperature entering condenser

• Air temperature must not exceed 120°F (39°C)

Water inlet valve filter screen is dirty

• Remove the water inlet valve and clean the filter

screen

Water inlet valve stuck open or leaking

• Turn off ice machine, if water continues to enter ice

machine, verify water pressure is ok then replace

water inlet valve

Water inlet valve is not working

• Water inlet valve must be replaced

Refrigeration problem

• Refer to refrigeration diagnostics

Water escaping from sump during freeze cycle

• Check standpipe and drain

• Check for water tracking out of water circuit

Part Number 000019553 Rev 00 04/26 UnderCounter - 167

Ice Machine Runs and No Ice Is Produced

No water to ice machine

• Correct water supply

Incorrect incoming water pressure

• Water pressure must be 20-80 psi (1.4-5.5 bar)

Excessive mineral buildup

• De-scale and sanitize the ice machine

Ambient temperature is too high or low

• Ambient temperature must be between 50°F and

110°F (10°C and 43°C)

Compressor relay inoperable

• No voltage to coil or coil defective

• Defective contacts

Compressor off on overload

• Condenser fan motor defective

• Incorrect flow to water cooled condenser

• Ambient temperature too high

• Condenser blocked

• Faulty start components

168 - UnderCounter Part Number 000019553 Rev 00 04/26

Final Analysis

The column with the highest number of check marks

identifies the refrigeration problem.

Column 1 – Harvest Valve Leaking

A leaking harvest valve must be replaced.

Column 2 – Low Charge/TXV Starving

Normally, a starving expansion valve only affects the freeze

cycle pressures, not the harvest cycle pressures. A low

refrigerant charge normally affects both pressures. Verify

the ice machine is not low on charge before replacing an

expansion valve.

Add refrigerant charge in 2 oz. (57 g) increments as a

diagnostic procedure to verify a low charge. (Do not add

more than the total charge of refrigerant). If the problem

is corrected, the ice machine is low on charge. Find the

refrigerant leak.

The ice machine must operate with the nameplate charge.

If the leak cannot be found, proper refrigerant procedures

must still be followed. Change the liquid line drier,

evacuate the system and weigh in the proper charge.

If the problem is not corrected by adding charge, the

expansion valve is faulty.

Column 3 – TXV Flooding

A loose or improperly mounted expansion valve bulb

causes the expansion valve to flood. Check bulb mounting,

insulation, etc., before changing the valve.

Column 4 – Compressor

Replace the compressor and start components. To receive

warranty credit, the compressor ports must be properly

sealed by crimping and soldering them closed. Old start

components must be returned with the faulty compressor.

Part Number 000019553 Rev 00 04/26 UnderCounter - 169

SYMPTOM #3

Ice Machine Will Not Harvest – Freeze Cycle Is Normal

and Ice Cubes Are Not Melted After Harvest

NOYES

YES

Low Producon, Normal Fill

Paern, Long Harvest Cycle,

Possible SL #2, Back of Cubes

Are Not Melted

Discharge line temperature is greater than 150°F

at the end of the freeze cycle?

Refer to

Symptom #2

Freeze Cycle

Operaonal

Analysis Table

Refer to Sequence of

Operaon and Wiring

Diagram

Harvest Valve is

Energized?

170 - UnderCounter Part Number 000019553 Rev 00 04/26

YESNO

YES

Head Pressure is High, Sucon

Pressure is Low in Harvest?

(Refer to Pressure Charts)

Self Contained

Air-cooled Condenser?

Fan cycling Control

operates correctly in

freeze cycle?

Fan Cycling Control

Opens below setpoint

in harvest cycle?

Are you sure Discharge Line

Temperature is Normal?

Repeat this ﬂowchart and

verify all data

Replace Fan Cycling

Control

Replace

Harvest

Valve

Part Number 000019553 Rev 00 04/26 UnderCounter - 171

SYMPTOM #4

Ice Machine Will Not Harvest – Freeze Cycle is Normal

and Ice Cubes Are Not Melted After Harvest

YES

START

Are back of the cubes

melted at end of harvest

cycle?

Is Ice Machine

level?

Level Ice

Machine

Does ice remain frozen

to the evaporator at the

end of the harvest cycle?

Refer to

Symptom #3 Ice

Machine will not

harvest

172 - UnderCounter Part Number 000019553 Rev 00 04/26

YES

*A damaged evaporator may not be repairable. For example: the top molding assembly is replaceable however the side moldings and/or the evaporator grid is not repairable.

Is the evaporator dirty or

damaged?*

(Dry evaporator first then check)

Dents, loose parons or plang

issues

Discharge line temperature is greater than

150°F (65°C) at the end of the freeze

cycle?

Are ice thickness, cycle

mesand slab weights correct?

Refer to Heavily Scaled

De-scaling Procedure

Refer to Symptom #2 Freeze Cycle

Operaonal Analysis Table

Refer to Manual Cleaning

Procedure

Part Number 000019553 Rev 00 04/26 UnderCounter - 173

Main Fuse

ALL MODELS

Function

The control board fuse stops ice machine operation if

electrical components fail causing high amp draw.

Specifications

The main fuse is 250 Volt, 10 amp.

Warning

High (line) voltage is applied to the control board at

all times. Removing the control board fuse or moving

the toggle switch to OFF will not remove the power

supplied to the control board.

Check Procedure

1. If the bin switch light is on with the ice damper

closed, the fuse is good.

Warning

Disconnect electrical power to the entire ice machine

before proceeding.

2. Remove the fuse. Check the resistance across the fuse

with an ohmmeter.

Reading Result

Open (OL) Replace fuse

Closed (O) Fuse is good

Component Check Procedures

174 - UnderCounter Part Number 000019553 Rev 00 04/26

Touch Pad

KP0150/KP0250

Function

User interface to select ice making, delay start or cleaning

cycle and provides feedback on ice machine operation.

Check For Normal Operation

Action Normal Function

Press and hold the control

board test button for 3 seconds

All Touch Pad lights turn on

Press test button All Touch Pad lights turn off

Press power button Power light turns on

With power light energized

press the delay button 4 times

Cycles through 4 hour delay,

12 hour delay, 24 hour delay

and off

Press and hold the power

button for 3 seconds

Power light turns off

Press and hold the clean button

for 3 seconds

Clean light turns on

Press and hold the clean button

for 3 seconds

Clean light turns off

If any switches do not operate correctly, disconnect main power

to the ice machine to reset the control board and perform a

second test. If the second test doesn’t show normal function,

perform the Ohm test to verify the issue is not a wiring or control

board issue.

Part Number 000019553 Rev 00 04/26 UnderCounter - 175

Ohm Test

Disconnect power from ice machine.

Disconnect wire from control board and Ohm touch pad

and interconnecting wire to verify correct operation.

Pressing and depressing the touch pad must open and

close the circuit. A switch that functions correctly will

close as the button is pressed and open as the button is

released.

Do not insert electrical probe into end of connector.

This will stretch the connector and cause intermittent

connection issues. All readings must be taken on the flat

exterior of the connector.

Selection Wires

On/Off #2 & #7

Delay #3 & #7

Clean #4 & #7

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12

Touch electrical probe to

these locations only

Do not insert in end of

connector

Control Board Connector

176 - UnderCounter Part Number 000019553 Rev 00 04/26

FLOAT SWITCH

KP0150/KP0250

Function

Open and close to indicate to the control board the level of

water in the water trough.

Specifications

Normally closed, float operated magnetic reed switch.

The float switch contacts are closed in the down position.

When water raises the float to the up position the magnet

in the float opens the contacts.

Check Procedure

The ice machine uses two float switches.

Ice Thickness Float -Indicates the water level has been

reached.

Harvest Float - Indicates a harvest cycle needs to be

initiated.

Initial testing can be performed by viewing the control

board light(s) while raising and lowering the float. The

corresponding control board light must turn on and off

when the float is raised and lowered.

Harvest Float switch:

A. The light must be on in the up position.

B. The light must be off in the down position.

Caution

Do not disassemble float for Descaling - Incorrect

reassembly of the float will result in an ice machine

that will not harvest.

Part Number 000019553 Rev 00 04/26 UnderCounter - 177

Ice Thickness Float Switch:

A. The light must be off in the down position.

B. The light must be on in the up position.

If the control board light does not respond to the float

proceed with step 1 below.

1. Disconnect power to the ice machine, pull the wire

connector for the float switch through the bulkhead

and disconnect.

2. Attach an ohm meter lead to each float switch wire.

3. Place the float in the down position - The float switch

must be closed.

4. Place the float in the up position - The float switch

must be open.

Float Closed Float Open

NOTE: Make adjustments with the ice machine in the off

position. Making adjustments during the freeze cycle may

produce an initial sheet of ice that is thicker than future

cycles.

Float Float Up Float Down

Ice Thickness Float OL < 1 Ohm

Harvest Float OL < 1 Ohm

178 - UnderCounter Part Number 000019553 Rev 00 04/26

WATER TROUGH THERMISTOR

KP0150/KP0250

Function

Thermistor resistance values change with temperature.

The value supplied to the control board is used to identify

temperature at the thermistor location.

When the resistance value indicates a temperature of 34°F

(1.1°C) the control board will delay the water pump for 25

seconds. When the water pump restarts the water inlet

valve will energize for 7 seconds then turn off.

NOTE: If the ice machine is experiencing long freeze cycle

shut down, we recommend removing the thermistor and

bracket permanently.

Check procedure

THERMISTOR

1. Disconnect thermistor from control board and

measure resistance.

2. Measure temperature at the thermistor.

3. Compare measured resistance/temperature readings

to resistance/temperature relationship chart.

A. Within 10% of the published resistance value

Thermistor is good

B. Not within 10% of the published resistance value

- Thermistor is defective.

CONTROL BOARD OPERATION

1. Disconnect thermistor from control board - The

control board thermistor LED will flash 1 second on

and 1 second off.

2. The control board will default to the 3.75 minute

pump delay in the freeze cycle.

Part Number 000019553 Rev 00 04/26 UnderCounter - 179

THERMISTOR CHART

Important

If the ohmmeter reads “OL,” check the scale setting on

the meter before assuming the thermistor is bad.

Temperature of Thermistor Resistance

°C °F K Ohms (x1000)

-7 - -1.0 19 - 30 47.06 - 34.36

0.0 32 32.65

0.5 33 31.82

1.0 33.8 31.03

1.1 34 30.85

1.5 34.7 30.25

2.0 35.6 29.49

2.5 36.5 28.76

3.0 37 28.05

3.5 38 27.36

4.0 - 10.5 39 - 51 26.68 - 19.43

11.0 - 15.0 52 - 59 18.97 - 15.71

15.5 - 20.0 60 - 68 15.35 - 12.49

20.5 - 25.0 69 - 77 12.21 - 10.00

25.5 - 30.0 78 - 86 9.78 - 8.05

30.5 - 35.0 87 - 95 7.88 - 6.39

36.5 - 40.0 98 - 104 6.14 - 5.32

40.5 - 46.0 105 - 115 5.22 - 4.20

NOTE: The control board will default to a 3.75 minute

pump delay in the freeze cycle, whenever the thermistor is

disconnected or reads outside the resistance ranges in the

table.

180 - UnderCounter Part Number 000019553 Rev 00 04/26

Bin Switch

K & KF MODELS

Function

Bin switch operation is controlled by the movement of the

ice damper. The bin switch has two main functions:

1. Terminating the harvest cycle and returning the ice

machine to the freeze cycle.

This occurs when the bin switch is opened and closed

again within 7 seconds of opening during the harvest

cycle.

2. Automatic ice machine shut-off.

If the storage bin is full at the end of a harvest cycle,

the sheet of cubes fails to clear the ice damper and

holds it down. After the ice damper is held down for 7

seconds, the ice machine shuts off.

The ice machine remains off until enough ice is

removed from the storage bin to allow the sheet

of cubes to drop clear of the ice damper. As the ice

damper swings back to the operating position, the bin

switch closes and the ice machine restarts.

Important

The ice damper must be up (bin switch closed) to start

ice making.

Check Procedure

1. Set the toggle switch to OFF.

1. Watch the bin switch light on the control board.

2. Move the ice damper upward, toward the evaporator.

The bin switch must close. The bin switch light “on”

indicates the bin switch has closed properly.

3. Move the ice damper away from the evaporator.

The bin switch must open. The bin switch light “off”

indicates the bin switch has opened properly.

Part Number 000019553 Rev 00 04/26 UnderCounter - 181

Ohm Test

1. Disconnect the bin switch wires to isolate the bin

switch from the control board.

2. Connect an ohmmeter to the disconnected bin switch

wires.

3. Cycle the bin switch open and closed numerous times

by opening and closing the ice damper.

NOTE: To prevent mis-diagnosis:

• Always use the ice damper magnet to cycle the

switch (a larger or smaller magnet will affect switch

operation).

• Watch for consistent readings when the bin switch is

cycled open and closed (bin switch failure could be

erratic).

182 - UnderCounter Part Number 000019553 Rev 00 04/26

Bin Switch Removal

1. Disconnect power to the ice machine at service

disconnect.

2. Disconnect bin switch wires in control box.

3. Insert a small screwdriver through the hole located in

the top of the bin switch, and depress mounting tab

slightly.

4. While depressing mounting tab roll bin switch to right

to release.

5. Pull wiring into evaporator compartment.

BIN SWITCH

INSERT SCREWDRIVER

AND DEPRESS TAB

Bin Switch Removal

Part Number 000019553 Rev 00 04/26 UnderCounter - 183

ON/OFF/WASH Toggle Switch

K & KF MODELS

Function

The switch is used to place the ice machine in ON, OFF or

WASH mode of operation.

Specifications

Single-pole, double-throw switch. The switch is connected

into a varying low D.C. voltage circuit.

Check Procedure

NOTE: Because of a wide variation in D.C. voltage, it is not

recommended that a voltmeter be used to check toggle

switch operation.

1. Inspect the toggle switch for correct wiring.

2. Isolate the toggle switch by disconnecting all wires

from the switch, or by disconnecting the Molex

connector from the control board.

3. Check across the toggle switch terminals using a

calibrated ohmmeter. Note where the wire numbers

are connected to the switch terminals, or refer to the

wiring diagram to take proper readings.

Switch Setting Terminals Ohm Reading

ON 24-21 Open

24-20 Closed

20-21 Open

WASH 24-20 Open

24-21 Closed

20-21 Open

OFF 24-20 Open

24-21 Open

20-21 Open

Replace the toggle switch if ohm readings do not match all

three-switch settings.

184 - UnderCounter Part Number 000019553 Rev 00 04/26

Ice Thickness Probe

K & KF MODELS

How the Probe Works

The Koolaire® electronic sensing circuit does not rely on

refrigerant pressure, evaporator temperature, water levels

or timers to produce consistent ice formation.

As ice forms on the evaporator, water (not ice) contacts the

ice thickness probe. After the water completes this circuit

across the probe continuously for 6-10 seconds, a harvest

cycle is initiated.

Freeze Time Lock-In Feature

The ice machine control system incorporates a freeze time

lock-in feature. This prevents the ice machine from short

cycling in and out of harvest.

The control board locks the ice machine in the freeze

cycle for six minutes. If water contacts the ice thickness

probe during these six minutes, the harvest light will come

on (to indicate that water is in contact with the probe),

but the ice machine will stay in the freeze cycle. After

the six minutes are up, a harvest cycle is initiated. This

is important to remember when performing diagnostic

procedures on the ice thickness control circuitry.

To allow the service technician to initiate a harvest cycle

without delay, this feature is not used on the first cycle

after moving the toggle switch OFF and back to ON.

Maximum Freeze Time

The control system includes a built-in safety, which will

automatically cycle the ice machine into harvest after

60 minutes in the freeze cycle.

Part Number 000019553 Rev 00 04/26 UnderCounter - 185

ICE THICKNESS CHECK

The ice thickness probe is factory-set to maintain the ice

bridge thickness at 1/8" (3.2 mm).

NOTE: Make sure the Ice Damper is in place when

performing this check. It prevents water from splashing out

of the water trough.

1. Inspect the bridge connecting the cubes. It should be

about 1/8" (3.2 mm) thick.

2. If adjustment is necessary, turn the ice thickness

probe adjustment screw clockwise to increase bridge

thickness, or counterclockwise to decrease bridge

thickness.

NOTE: Turning the adjustment 1/3 of a turn will change the

ice thickness about 1/16" (1.5 mm).

ADJUSTING

SCREW

1/8" (3.2 mm) ICE

BRIDGE THICKNESS

Ice Thickness Check

Make sure the ice thickness probe wire and the bracket do

not restrict movement of the probe.

186 - UnderCounter Part Number 000019553 Rev 00 04/26

Diagnosing Start Components

If the compressor attempts to start, or hums and trips the

overload protector, check the start components before

replacing the compressor.

CAPACITOR

Visual evidence of capacitor failure can include a bulged

terminal end or a ruptured membrane. Do not assume a

capacitor is good if no visual evidence is present. A good

test is to install a known good substitute capacitor. Use

a capacitor tester when checking a suspect capacitor.

Clip the bleed resistor off the capacitor terminals before

testing.

RELAY

The relay has a set of contacts that connect and disconnect

the start capacitor from the compressor start winding. The

contacts on the relay are normally open. The relay senses

the voltage generated by the start winding and closes

and then opens the contacts as the compressor motor

starts. The contacts remain open until the compressor is

de-energized.

Part Number 000019553 Rev 00 04/26 UnderCounter - 187

Compressor Electrical Diagnostics

The compressor does not start or will trip repeatedly on

overload.

Check Resistance (Ohm) Values

NOTE: Compressor windings can have very low ohm

values. Use a properly calibrated meter.

Perform the resistance test after the compressor cools. The

compressor dome should be cool enough to touch (below

120°F/49°C) to ensure that the overload is closed and the

resistance readings will be accurate.

Single Phase Compressors

1. Disconnect power from the condensing unit and

remove the wires from the compressor terminals.

2. The resistance values between C and S and between

C and R, when added together should equal the

resistance value between S and R.

3. If the overload is open, there will be a resistance

reading between S and R, and open readings between

C and S and between C and R. Allow the compressor

to cool, then check the readings again.

Check Motor Windings to Ground

Check continuity between all three terminals and the

compressor shell or copper refrigeration line. Scrape metal

surface to get good contact. If continuity is present, the

compressor windings are grounded and the compressor

should be replaced.

To determine if the compressor is seized check the amp

draw while the compressor is trying to start.

188 - UnderCounter Part Number 000019553 Rev 00 04/26

Compressor Drawing Locked Rotor

The two likely causes of this are:

• Defective starting component

• Mechanically seized compressor

To determine which you have:

1. Install high and low side gauge set.

2. Try to start the compressor.

3. Watch the pressures closely.

• If the pressures do not move, the compressor is

seized. Replace the compressor.

• If the pressures move, the compressor is turning

slowly and is not seized. Check the capacitors and

relay.

Compressor Drawing High Amps

The continuous amperage draw on start-up should not be

near the maximum fuse size indicated on the serial tag.

The wiring must be correctly sized to minimize voltage

drop at compressor start-up. The voltage when the

compressor is trying to start must be within ±10% of the

nameplate voltage.

Part Number 000019553 Rev 00 04/26 UnderCounter - 189

Fan Cycle Control

Function

Cycles the fan motor on and off to maintain proper

operating discharge pressure.

The fan cycle control closes on an increase, and opens on a

decrease in discharge pressure.

Specifications

Model Cut-In (Close) Cut-Out (Open)

KP0150 KP0250 200 psig ±5 150 psig ±5

KF0150 K0170 275 psig ±5 225 psig ±5

KF0250 K0270 250 psig ±5 200 psig ±5

Check Procedure

1. Disconnect electrical power to the ice machine at the

electrical service disconnect.

2. Verify fan motor windings are not open or grounded,

and fan spins freely.

3. Connect manifold gauge set to ice machine.

4. Hook voltmeter in parallel across the fan cycle control,

leaving wires attached.

5. Reconnect electrical power to the ice machine and set

the ON/OFF/WASH toggle switch to ON.

6. Wait until water flows over the evaporator then refer

to chart below.

System

Pressure:

Reading

Should Be:

Fan

Should Be:

above cut-in 0 volts running

below cut-out line voltage off

190 - UnderCounter Part Number 000019553 Rev 00 04/26

High Pressure Cutout (HPCO) Control

Function

Stops the ice machine if subjected to excessive high-side

pressure.

The HPCO control is normally closed, and opens on a rise

in discharge pressure.

Specifications

Model Cut-In (Close) Cut-Out (Open)

KP0150 KP0250

250 psig ±10 350 psig ±5

KF0150 K0170

KF0250 K0270

300 psig ±10 450 psig ±5

Check Procedure

1. Set ON/OFF/WASH switch to OFF.

2. Connect manifold gauge set.

3. Hook voltmeter in parallel across the HPCO, leaving

wires attached.

4. On water-cooled models, close the water service

valve to the water condenser inlet. On self-contained

air-cooled models, disconnect the fan motor.

5. Set ON/OFF/WASH switch to ON.

6. No water or air flowing through the condenser will

cause the HPCO control to open because of excessive

pressure. Watch the pressure gauge and record the

cut-out pressure.

Warning

If discharge pressure exceeds 460 psig and the HPCO

control does not cut out, set ON/OFF/WASH switch to

OFF to stop ice machine operation.

Replace the HPCO control if it:

• Will not reset (below 300 psig)

• Does not open at the specified cut-out point

Part Number 000019553 Rev 00 04/26 UnderCounter - 191

Filter-Driers

Liquid Line Filter Drier

The filter-drier used on Koolaire® ice machines are

manufactured to Koolaire® specifications.

The difference between a Koolaire® drier and an off-

the-shelf drier is in filtration. A Koolaire® drier has

dirt-retaining filtration, with fiberglass filters on both the

inlet and outlet ends. This is very important because ice

machines have a back-flushing action that takes place

during every harvest cycle.

A Koolaire® filter-drier has a very high moisture removal

capability and a good acid removal capacity.

Important

The liquid line drier is covered as a warranty part. The

liquid line drier must be replaced any time the system

is opened for repair.

192 - UnderCounter Part Number 000019553 Rev 00 04/26

Refrigerant Recovery/Evacuation

Definitions

Recover

To remove refrigerant, in any condition, from a system and

store it in an external container, without necessarily testing

or processing it in any way.

Recycle

To clean refrigerant for re-use by oil separation and single

or multiple passes through devices, such as replaceable

core filter-driers, which reduce moisture, acidity and

particulate matter. This term usually applies to procedures

implemented at the field job site or at a local service shop.

Reclaim

To reprocess refrigerant to new product specifications (see

below) by means which may include distillation. A chemical

analysis of the refrigerant is required after processing to be

sure that product specifications are met. This term usually

implies the use of processes and procedures available only

at a reprocessing or manufacturing facility.

Chemical analysis is the key requirement in this definition.

Regardless of the purity levels reached by a reprocessing

method, refrigerant is not considered “reclaimed” unless it

has been chemically analyzed and meets ARI Standard 700

(latest edition).

New Product Specifications

This means ARI Standard 700 (latest edition). Chemical

analysis is required to assure that this standard is met.

Part Number 000019553 Rev 00 04/26 UnderCounter - 193

REFRIGERANT REUSE POLICY

Koolaire® recognizes and supports the need for

proper handling, re-use, and disposal of CFC and HCFC

refrigerants. Koolaire® service procedures require

recapturing refrigerants, not venting them to the

atmosphere.

It is not necessary, in or out of warranty, to reduce or

compromise the quality and reliability of your customers’

products to achieve this.

Important

Koolaire® assumes no responsibility for use of

contaminated refrigerant. Damage resulting from the

use of contaminated, recovered, or recycled refrigerant

is the sole responsibility of the servicing company.

Koolaire® approves the use of:

1. New Refrigerant

• Must be of original nameplate type.

2. Reclaimed Refrigerant

• Must be of original nameplate type.

• Must meet ARI Standard 700 (latest edition)

specifications.

3. Recovered or Recycled Refrigerant

• Must be recovered or recycled in accordance with

current local, state and federal laws.

• Must be recovered from and re-used in the same

Koolaire® product. Re-use of recovered or recycled

refrigerant from other products is not approved.

• Recycling equipment must be certified to ARI

Standard 740 (latest edition) and be maintained to

consistently meet this standard.

194 - UnderCounter Part Number 000019553 Rev 00 04/26

4. Recovered refrigerant must come from a

“contaminant-free” system. To decide whether the

system is contaminant free, consider:

• Type(s) of previous failure(s)

• Whether the system was cleaned, evacuated and

recharged properly following failure(s)

• Whether the system has been contaminated by

this failure

• Compressor motor burnouts and improper past

service prevent refrigerant re-use.

• Refer to “System Contamination Cleanup” on

page 198 to test for contamination.

5. “Substitute” or “Alternative” Refrigerant

• Must use only Koolaire®-approved alternative

refrigerants.

• Must follow Koolaire®-published conversion

procedures.

Part Number 000019553 Rev 00 04/26 UnderCounter - 195

RECOVERY AND RECHARGING PROCEDURES

Do not purge refrigerant to the atmosphere. Capture

refrigerant using recovery equipment. Follow the

manufacturer’s recommendations.

Important

Koolaire® assumes no responsibility for the use of

contaminated refrigerant. Damage resulting from

the use of contaminated refrigerant is the sole

responsibility of the servicing company.

Important

Replace the liquid line drier before evacuating and

recharging. Use only a OEM liquid line filter drier to

prevent voiding the warranty.

CONNECTIONS

1. Suction side of the compressor through the suction

service valve.

2. Discharge side of the compressor through the

discharge service valve.

196 - UnderCounter Part Number 000019553 Rev 00 04/26

SELFCONTAINED RECOVERY/EVACUATION

1. Place the toggle switch in the OFF position.

2. Install manifold gauge set, charging cylinder/scale,

and recovery unit or two-stage vacuum pump.

3. Open (backseat) the high and low side ice machine

service valves, and open high and low side on

manifold gauge set.

4. Perform recovery or evacuation:

A. Recovery: Operate the recovery unit as directed

by the manufacturer’s instructions.

B. Evacuation prior to recharging: Pull the system

down to 500 microns. Then, allow the pump to

run for an additional half hour. Turn off the pump

and perform a standing vacuum leak check.

NOTE: Check for leaks using a halide or electronic leak

detector after charging the ice machine.

Follow the Charging Procedures below.

CHARGING PROCEDURES

Important

The charge is critical on all Koolaire® ice machines.

Use a scale or a charging cylinder to ensure the proper

charge is installed.

1. Be sure the toggle switch is in the OFF position.

2. Close the vacuum pump valve, the low side service

valve, and the low side manifold gauge valve.

3. Open the high side manifold gauge valve, and

backseat the high side service valve.

4. Open the charging cylinder and add the proper

refrigerant charge (shown on nameplate) through the

discharge service valve.

5. Let the system “settle” for 2 to 3 minutes.

6. Place the toggle switch in the ICE position.

Part Number 000019553 Rev 00 04/26 UnderCounter - 197

7. Close the high side on the manifold gauge set. Add

any remaining vapor charge through the suction

service valve (if necessary).

NOTE: Manifold gauge set must be removed properly to

ensure that no refrigerant contamination or loss occurs.

8. Make sure that all of the vapor in the charging hoses

is drawn into the ice machine before disconnecting

the charging hoses.

A. Run the ice machine in freeze cycle.

B. Close the high side service valve at the ice

machine.

C. Open the low side service valve at the ice

machine (when supplied) or disconnect the low

loss fitting from the access valve.

D. Open the high and low side valves on the

manifold gauge set. Any refrigerant in the lines

will be pulled into the low side of the system.

E. Allow the pressures to equalize while the ice

machine is in the freeze cycle.

F. Close the low side service valve at the ice

machine.

9. Remove the hoses from the ice machine and install

the caps.

198 - UnderCounter Part Number 000019553 Rev 00 04/26

System Contamination Cleanup

General

This section describes the basic requirements for restoring

contaminated systems to reliable service.

Important

Koolaire® assumes no responsibility for the use of

contaminated refrigerant. Damage resulting from

the use of contaminated refrigerant is the sole

responsibility of the servicing company.

Determining Severity of Contamination

System contamination is generally caused by either

moisture or residue from compressor burnout entering the

refrigeration system.

Inspection of the refrigerant usually provides the first

indication of system contamination. Obvious moisture or

an acrid odor in the refrigerant indicates contamination.

If either condition is found, or if contamination is

suspected, use a Total Test Kit from Totaline or a similar

diagnostic tool. These devices sample refrigerant,

eliminating the need to take an oil sample. Follow the

manufacturer’s directions.

If a refrigerant test kit indicates harmful levels of

contamination, or if a test kit is not available, inspect the

compressor oil.

1. Remove the refrigerant charge from the ice machine.

2. Remove the compressor from the system.

3. Check the odor and appearance of the oil.

4. Inspect open suction and discharge lines at the

compressor for burnout deposits.

5. If no signs of contamination are present, perform

an acid oil test to determine the type of cleanup

required.

Part Number 000019553 Rev 00 04/26 UnderCounter - 199

Contamination/Cleanup Chart

Symptoms/Findings Required Cleanup

Procedure

No symptoms or suspicion of contamination Normal

evacuation/

recharging

procedure

Moisture/Air Contamination symptoms

Refrigeration system open to atmosphere

for longer than 15 minutes

Refrigeration test kit and/or acid oil test

shows contamination

No burnout deposits in open compressor

lines

Mild contamination

cleanup procedure

Mild Compressor Burnout symptoms

Oil appears clean but smells acrid

Refrigeration test kit or acid oil test shows

harmful acid content

No burnout deposits in open compressor

lines

Mild contamination

cleanup procedure

Severe Compressor Burnout symptoms

Oil is discolored, acidic, and smells acrid

Burnout deposits found in the compressor,

lines, and other components

Severe

contamination

cleanup procedure

200 - UnderCounter Part Number 000019553 Rev 00 04/26

MILD SYSTEM CONTAMINATION CLEANUP

PROCEDURE

1. Replace any failed components.

2. If the compressor is good, change the oil.

3. Replace the liquid line drier.

NOTE: If the contamination is from moisture, use heat

lamps during evacuation. Position them at the compressor,

condenser and evaporator prior to evacuation. Do not

position heat lamps too close to plastic components, or

they may melt or warp.

Important

Dry nitrogen is recommended for this procedure. This

will prevent CFC release.

4. Follow the normal evacuation procedure, except

replace the evacuation step with the following:

A. Pull vacuum to 1000 microns. Break the vacuum

with dry nitrogen and sweep the system.

Pressurize to a minimum of 5 psig.

B. Pull vacuum to 500 microns. Break the vacuum

with dry nitrogen and sweep the system.

Pressurize to a minimum of 5 psig.

C. Change the vacuum pump oil.

D. Pull vacuum to 500 microns. Run the vacuum

pump for 1/2 hour.

NOTE: You may perform a pressure test as a preliminary

leak check. You should use an electronic leak detector after

system charging to be sure there are no leaks.

5. Charge the system with the proper refrigerant to the

nameplate charge.

6. Operate the ice machine.

Part Number 000019553 Rev 00 04/26 UnderCounter - 201

SEVERE SYSTEM CONTAMINATION CLEANUP

PROCEDURE

1. Remove the refrigerant charge.

2. Remove the compressor.

3. Disassemble the harvest solenoid valve. If burnout

deposits are found inside the valve, install a rebuild

kit, and replace the TXV and head pressure control

valve.

4. Wipe away any burnout deposits from suction and

discharge lines at compressor.

5. Sweep through the open system with dry nitrogen.

Important

Refrigerant sweeps are not recommended, as they

release CFC into the atmosphere.

Dry nitrogen is recommended for this procedure. This

will prevent CFC release.

6. Install a new compressor and new start components.

7. Install suction line filter-drier in front of compressor.

8. Install a new liquid line drier.

9. Follow the normal evacuation procedure, except

replace the evacuation step with the following:

A. Pull vacuum to 1000 microns. Break the vacuum

with dry nitrogen and sweep the system.

Pressurize to a minimum of 5 psig.

B. Change the vacuum pump oil.

C. Pull vacuum to 500 microns. Break the vacuum

with dry nitrogen and sweep the system.

Pressurize to a minimum of 5 psig.

D. Change the vacuum pump oil.

E. Pull vacuum to 500 microns. Run the vacuum

pump for 1 additional hour.

10. Charge the system with the proper refrigerant to the

nameplate charge.

202 - UnderCounter Part Number 000019553 Rev 00 04/26

11. Operate the ice machine for one hour. Then, check

the pressure drop across the suction line filter-drier.

A. If the pressure drop is less than 2 psig, the filter-

drier should be adequate for complete cleanup.

B. If the pressure drop exceeds 2 psig, change the

suction line filter-drier and the liquid line drier.

Repeat until the pressure drop is acceptable.

12. Operate the ice machine for 48 – 72 hours. Replace

the suction line and liquid line drier if necessary.

13. Follow normal evacuation procedures.

Part Number 000019553 Rev 00 04/26 UnderCounter - 203

REPLACING PRESSURE CONTROLS WITHOUT

REMOVING REFRIGERANT CHARGE

This procedure reduces repair time and cost. Use it when

any of the following components require replacement, and

the refrigeration system is operational and leak-free.

• Fan cycle control

• High pressure cut-out control

• High side access valve

• Low side access valve

Important

This is a required in-warranty repair procedure.

1. Disconnect power to the ice machine.

2. Follow all manufacturers’ instructions supplied with

the pinch-off tool. Position the pinch-off tool around

the tubing as far from the pressure control as feasible.

(See the figure on next page.) Clamp down on the

tubing until the pinch-off is complete.

Warning

Do not unsolder a defective component. Cut it out of

the system. Do not remove the pinch-off tool until the

new component is securely in place.

3. Cut the tubing of the defective component with a

small tubing cutter.

4. Solder the replacement component in place. Allow

the solder joint to cool.

5. Remove the pinch-off tool.

6. Re-round the tubing. Position the flattened tubing in

the proper hole in the pinch off tool. Tighten the wing

nuts until the block is tight and the tubing is rounded.

NOTE: The pressure controls will operate normally once

the tubing is re-rounded. Tubing may not re-round 100%.

204 - UnderCounter Part Number 000019553 Rev 00 04/26

FIG. A - “PINCHING OFF” TUBING

FIG. B - RE-ROUNDING TUBING

SV1406

Using Pinch Off Tool

Part Number 000019553 Rev 00 04/26 UnderCounter - 205

KF0250/K0270 Condenser Fan Motor Access

Access to remove, clean or replace the condenser fan/

motor can be obtained by performing the following:

1. Disconnect electrical power to the ice machine at the

electrical service disconnect.

2. Remove the screws that secure the condenser to the

cabinet and the base to the cabinet.

3. Slide the base forward until contact is made with the

stop screw (approximately 2.5" [6.3 cm]).

Caution

Do not move base past the stop screw, tubing damage

could result.

4. Remove right hand screw securing condenser to base.

5. Pivot condenser forward to obtain 5" (12.7 cm)

between the cabinet and condenser shroud. Take care

not to kink refrigeration tubing.

REMOVE THREE

SCREWS AND PULL

BASE FORWARD TO

STOP SCREW.

5" (12.7 CM)

CLEARANCE

AFTER

PIVOTING

CONDENSER

2.5" (6.3 CM) TO

STOP SCREW

REMOVE SCREW AND

PIVOT CONDENSER TO

OBTAIN 5" (12.7 CM)

CLEARANCE BETWEEN

CABINET AND CONDENSER

SHROUD.

PT1295A

Accessing the Condenser Fan Motor

THIS PAGE INTENTIONALLY LEFT BLANK

Part Number 000019553 Rev 00 04/26 UnderCounter - 207

Main Fuse

Models Volt Amp

K, KF & KP 250 10

Bin Switch

Bin switch operation is controlled by the movement of the

ice damper.

ON/OFF/WASH Toggle Switch

Single-pole, double-throw switch. The switch is connected

into a varying low D.C. voltage circuit.

Fan Control Cycle

Model Cut-In (Close) Cut-Out (Open)

KP0150 KP0250 200 psig ±5 150 psig ±5

KF0150 K0170 275 psig ±5 225 psig ±5

KF0250 K0270 250 psig ±5 200 psig ±5

High Pressure Cutout (HPCO) Control

Model Cut-In (Close) Cut-Out (Open)

KP0150 KP0250

250 psig ±10 350 psig ±5

KF0150 K0170

KF0250 K0270

300 psig ±10 450 psig ±5

Component Specifications

208 - UnderCounter Part Number 000019553 Rev 00 04/26

Total System Refrigerant Charge

Important

This information is for reference only. Refer to the ice

machine serial number tag to verify the system charge.

Serial plate information overrides information listed

on this page.

R404A

Model Air-Cooled Water-Cooled

Refrigerant

Type

KF0150 14 oz (397 g) NA R404A

K0170 14 oz (397 g) NA R404A

KF0250 18 oz (510 g) NA R404A

K0270 22 oz (624 g) 16 oz (454 g) R404A

R290

Model Air-Cooled Water-Cooled

Refrigerant

Type

KP0150 4.9 oz (140 g) NA R290

KP0250 5.3 oz (150 g) NA R290

Part Number 000019553 Rev 00 04/26 UnderCounter - 209

Cycle Times, 24 Hr. Ice Production and

Refrigerant Pressure Charts

These charts are used as guidelines to verify correct ice

machine operation.

Accurate collection of data is essential to obtain the

correct diagnosis.

• Refer to “Operational Analysis Chart” for the list

of data that must be collected for refrigeration

diagnostics. This list includes: before beginning service,

ice production check, installation/visual inspection,

water system checklist, ice formation pattern,

safety limits, comparing evaporator inlet/outlet

temperatures, harvest valve analysis, discharge and

suction pressure analysis.

• Ice production checks that are within 10% of the chart

are considered normal. This is due to variances in

water and air temperature. Actual temperatures will

seldom match the chart exactly.

• Zero out manifold gauge set before obtaining pressure

readings to avoid mis-diagnosis.

• Discharge and suction pressure are highest at the

beginning of the cycle. Suction pressure will drop

throughout the cycle. Verify the pressures are within

the range indicated.

• Production and cycle times are for dice cube - Half dice

cube cycle times can be 2 - 3 minutes faster, depending

on model and ambient temperature.

Charts

210 - UnderCounter Part Number 000019553 Rev 00 04/26

KF0150A SELFCONTAINED AIRCOOLED

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

Air Temp.

Entering

Condenser

°F/°C

Freeze Time Harvest

TimeWater Temperature °F/°C

50/10 70/21 90/32

70/21 19.8-22.5 21.2-24.0 26.6-30.2

1.0-2.5

80/27 21.2-24.0 22.7-25.8 29.1-32.9

90/32 23.6-26.8 26.6-30.2 30.4-34.5

100/38 27.8-31.5 32.0-36.2 37.5-42.5

110/43 35.5-40.2 42.4-48.0 52.6-59.4

Times in minutes

24 Hour Ice Production

Air Temp.

Entering

Condenser

°F/°C

Water Temperature °F/°C

50/10 70/21 90/32

70/21 165 lbs

75 kgs

155 lbs

70 kgs

125 lbs

57 kgs

80/27 155 lbs

70 kgs

145 lbs

66 kgs

115 lbs

52 kgs

90/32 140 lbs

64 kgs

125 lbs

57 kgs

110 lbs

50 kgs

100/38 120 lbs

54 kgs

105 lbs

48 kgs

90 lbs

41 kgs

110/43 95 lbs

43 kgs

80 lbs

36 kgs

65 lbs

29 kgs

Based on average ice slab weight of 2.44 – 2.75 lb (1107 – 1247 g).

Regular cube derate is 7%

Part Number 000019553 Rev 00 04/26 UnderCounter - 211

Operating Pressures

Air Temp. Entering

Condenser °F/°C

Freeze Cycle

Discharge Pressure

PSIG

Suction Pressure

PSIG

50/10 220-280 psig

15.2-19.3 bar

60-38 psig

4.1-2.6 bar

70/21 220-280 psig

15.2-19.3 bar

60-38 psig

4.1-2.6 bar

80/27 240-290 psig

16.5-20.0 bar

70-38 psig

4.8-2.6 bar

90/32 280-330 psig

19.3-22.8 bar

75-38 psig

5.2-2.6 bar

100/38 310-380 psig

21.4-26.2 bar

85-41 psig

5.9-2.8 bar

110/43 315-390 psig

21.7-26.9 bar

90-41 psig

6.2-2.8 bar

Suction pressure drops gradually throughout the freeze cycle

Air Temp. Entering

Condenser °F/°C

Harvest Cycle

Discharge Pressure

PSIG

Suction Pressure

PSIG

50/10 150-170 psig

10.3-11.7 bar

90-110 psig

6.2-7.6 bar

70/21 150-170 psig

10.3-11.7 bar

95-115 psig

6.6-7.9 bar

80/27 160-190 psig

11.0-13.1 bar

100-120 psig

6.9-8.3 bar

90/32 180-210 psig

12.4-14.5 bar

160-140 psig

11.0-6.9 bar

100/38 200-230 psig

13.8-15.9 bar

120-160 psig

8.3-11.0 bar

110/43 200-240 psig

13.8-16.5 bar

140-170 psig

9.7-11.7 bar

212 - UnderCounter Part Number 000019553 Rev 00 04/26

KP0150A SELFCONTAINED AIRCOOLED

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

Air Temp.

Entering

Condenser

°F/°C

Freeze Time Harvest

TimeWater Temperature °F/°C

50/10 70/21 90/32

70/21 10.2-11.7 12.3-13.7 13.0-14.8

1.0-2.5

80/27 11.2-12.9 13.0-14.9 14.5-16.5

90/32 11.8-13.7 14.5-16.5 17.5-20.0

100/38 14.6-16.5 17.6-20.0 17.5-21.5

Times in minutes

24 Hour Ice Production

Air Temp.

Entering

Condenser

°F/°C

Water Temperature °F/°C

50/10 70/21 90/32

70/21 130 lbs

59 kgs

110 lbs

50 kgs

105 lbs

48 kgs

80/27 120 lbs

54 kgs

105 lbs

48 kgs

95 lbs

43 kgs

90/32 115 lbs

52 kgs

95 lbs

43 kgs

85 lbs

39 kgs

100/38 95 lbs

43 kgs

85 lbs

39 kgs

80 lbs

36 kgs

Based on average ice slab weight of 2.44 – 2.75 lb (1107 – 1247 g).

Regular cube derate is 7%

Part Number 000019553 Rev 00 04/26 UnderCounter - 213

Operating Pressures

Air Temp. Entering

Condenser °F/°C

Freeze Cycle

Discharge Pressure Suction Pressure

50/10 140-210 psig

9.7-14.5 bar

45-17 psig

3.1-1.2 bar

70/21 140-215 psig

9.7-14.8 bar

54-17 psig

3.7-1.2 bar

80/27 150-220 psig

10.3-15.2 bar

55-17 psig

3.8-1.2 bar

90/32 160-225 psig

11.0-15.5 bar

58-17 psig

4.0-1.2 bar

100/38 205-230 psig

14.1-15.9 bar

60-20 psig

4.1-1.4 bar

Suction pressure drops gradually throughout the freeze cycle

Air Temp. Entering

Condenser °F/°C

Harvest Cycle

Discharge Pressure Suction Pressure

50/10 95-120 psig

6.6-8.3 bar

65-95 psig

4.5-6.6 bar

70/21 100-120 psig

6.9-8.3 bar

70-95 psig

4.8-6.6 bar

80/27 105-120 psig

7.2-8.3 bar

75-95 psig

5.2-6.6 bar

90/32 120-140 psig

8.3-9.7 bar

90-114 psig

6.2-7.9 bar

100/38 140-160 psig

9.7-11.0 bar

110-135 psig

7.6-9.3 bar

214 - UnderCounter Part Number 000019553 Rev 00 04/26

K0170A SELFCONTAINED AIRCOOLED

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

Air Temp.

Entering

Condenser

°F/°C

Freeze Time Harvest

TimeWater Temperature °F/°C

50/10 70/21 90/32

70/21 17.6-20-1 20.5y-23.3 24.5-28.0

1.0-2.5

80/27 19.8-22.5 20.9-23.9 27.8-31.5

90/32 20.9-23.9 24.5-28.0 28.1-31.9

100/38 25.5-29.0 30.4-34.5 33.7-38.3

110/43 32.0-36.2 39.8-45.1 48.7-55.1

Times in minutes

24 Hour Ice Production

Air Temp.

Entering

Condenser

°F/°C

Water Temperature °F/°C

50/10 70/21 90/32

70/21 175 lbs

79 kgs

160 lbs

73 kgs

130 lbs

59 kgs

80/27 165 lbs

75 kgs

150 lbs

68 kgs

120 lbs

54 kgs

90/32 150 lbs

68 kgs

130 lbs

59 kgs

115 lbs

52 kgs

100/38 130 lbs

59 kgs

110 lbs

50 kgs

97 lbs

44 kgs

110/43 105 lbs

48 kgs

85 lbs

39 kgs

70 lbs

32 kgs

Based on average ice slab weight of 2.44 – 2.75 lb (1107 – 1247 g).

Regular cube derate is 7%

Part Number 000019553 Rev 00 04/26 UnderCounter - 215

Operating Pressures

Air Temp. Entering

Condenser °F/°C

Freeze Cycle

Discharge Pressure

PSIG

Suction Pressure

PSIG

50/10 220-280 psig

15.2-19.3 bar

60-38 psig

4.1-2.6 bar

70/21 220-280 psig

15.2-19.3 bar

60-38 psig

4.1-2.6 bar

80/27 240-290 psig

16.5-20.0 bar

70-38 psig

4.8-2.6 bar

90/32 280-330 psig

19.3-22.8 bar

75-38 psig

5.2-2.6 bar

100/38 310-380 psig

21.4-26.2 bar

85-41 psig

5.9-2.8 bar

110/43 315-390 psig

21.7-26.9 bar

90-41 psig

6.2-2.8 bar

Suction pressure drops gradually throughout the freeze cycle

Air Temp. Entering

Condenser °F/°C

Harvest Cycle

Discharge Pressure

PSIG

Suction Pressure

PSIG

50/10 150-170 psig

10.3-11.7 bar

90-110 psig

6.2-7.6 bar

70/21 150-170 psig

10.3-11.7 bar

95-115 psig

6.6-7.9 bar

80/27 160-190 psig

11.0-13.1 bar

100-120 psig

6.9-8.3 bar

90/32 180-210 psig

12.4-14.5 bar

160-140 psig

11.0-9.7 bar

100/38 200-230 psig

13.8-15.9 bar

120-160 psig

8.3-11.0 bar

110/43 200-240 psig

13.8-20.0 bar

140-170 psig

9.7-11.7 bar

216 - UnderCounter Part Number 000019553 Rev 00 04/26

KF0250 SELFCONTAINED AIRCOOLED

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

Air Temp.

Entering

Condenser

°F/°C

Freeze Time Harvest

TimeWater Temperature °F/°C

50/10 70/21 90/32

70/21 12.3-14.0 14.5-16.5 16.5-18.8

1.0-2.5

80/27 13.1-15.5 15.2-17.4 17.5-19.9

90/32 14.1-16.1 18.0-20.5 20.5-23.3

100/38 15.2-17.4 21.2-24.0 24.5-27.8

110/43 16.5-18.8 25.5-29.0 30.4-34.5

Times in minutes

24 Hour Ice Production

Air Temp.

Entering

Condenser

°F/°C

Water Temperature °F/°C

50/10 70/21 90/32

70/21 255 lbs

116 kgs

220 lbs

100 kgs

195 lbs

88 kgs

80/27 240 lbs

109 kgs

210 lbs

95 kgs

185 lbs

84 kgs

90/32 225 lbs

102 kgs

180 lbs

82 kgs

160 lbs

73 kgs

100/38 210 lbs

95 kgs

155 lbs

70 kgs

135 lbs

61 kgs

110/43 195 lbs

88 kgs

130 lbs

59 kgs

110 lbs

50 kgs

Based on average ice slab weight of 2.44 – 2.75 lb (1107 – 1247 g).

Part Number 000019553 Rev 00 04/26 UnderCounter - 217

Operating Pressures

Air Temp. Entering

Condenser °F/°C

Freeze Cycle

Discharge Pressure

PSIG

Suction Pressure

PSIG

50/10 200-255 psig

13.8-17.6 bar

60-22 psig

4.1-1.5 bar

70/21 200-255 psig

13.8-17.6 bar

60-23 psig

4.1-1.6 bar

80/27 200-290 psig

13.8-20.0 bar

60-24 psig

4.1-1.7 bar

90/32 235-320 psig

16.2-22.1 bar

65-25 psig

4.5-1.7 bar

100/38 260-370 psig

17.9-25.5 bar

70-31 psig

4.8-2.1 bar

110/43 310-365 psig

21.4-25.2 bar

80-42 psig

5.5-2.9 bar

Suction pressure drops gradually throughout the freeze cycle

Air Temp. Entering

Condenser °F/°C

Harvest Cycle

Discharge Pressure

PSIG

Suction Pressure

PSIG

50/10 165-200 psig

11.4-13.8 bar

70-95 psig

4.8-6.6 bar

70/21 170-205 psig

11.7-14.1 bar

70-100 psig

4.8-6.9 bar

80/27 175-210 psig

12.1-14.5 bar

75-100 psig

5.2-6.9 bar

90/32 200-240 psig

13.8-16.5 bar

80-105 psig

5.5-7.2 bar

100/38 215-255 psig

14.8-17.6 bar

85-120 psig

5.9-8.3 bar

110/43 230-270 psig

15.9-18.6 bar

110-130 psig

7.6-9.0 bar

218 - UnderCounter Part Number 000019553 Rev 00 04/26

KP0250A SELFCONTAINED AIRCOOLED

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

Air Temp.

Entering

Condenser

°F/°C

Freeze Time Harvest

TimeWater Temperature °F/°C

50/10 70/21 90/32

70/21 13.9-16.0 16.9-18.9 18.0-20.3

1.0-2.5

80/27 15.0-17.2 17.0-20.1 19.4-22.4

90/32 16.2-18.5 19.5-22.5 21.6-25.0

100/38 19.0-21.5 20.4-24.0 23.4-26.5

Times in minutes

24 Hour Ice Production

Air Temp.

Entering

Condenser

°F/°C

Water Temperature °F/°C

50/10 70/21 90/32

70/21 225 lbs

102 kgs

190 lbs

86 kgs

175 lbs

79 kgs

80/27 210 lbs

95 kgs

180 lbs

82 kgs

160 lbs

73 kgs

90/32 195 lbs

88 kgs

160 lbs

73 kgs

145 lbs

66 kgs

100/38 170 lbs

77 kgs

150 lbs

68 kgs

140 lbs

64 kgs

Based on average ice slab weight of 2.44 – 2.75 lb (1107 – 1247 g).

Regular cube derate is 7%

Part Number 000019553 Rev 00 04/26 UnderCounter - 219

Operating Pressures

Air Temp. Entering

Condenser °F/°C

Freeze Cycle

Discharge Pressure Suction Pressure

50/10 145-205 psig

10.0-14.1 bar

40-14 psig

2.8-1.0 bar

70/21 150-210 psig

10.3-14.5 bar

42-15psig

2.9-1.0 bar

80/27 160-230 psig

11.0-15.9 bar

46-18 psig

3.2-1.2 bar

90/32 180-240 psig

12.4-16.5 bar

51-20 psig

3.5-1.4 bar

100/38 230-280 psig

15.9-19.3 bar

54-24 psig

3.7-1.7 bar

Suction pressure drops gradually throughout the freeze cycle

Air Temp. Entering

Condenser °F/°C

Harvest Cycle

Discharge Pressure Suction Pressure

50/10 90-105 psig

6.2-7.2 bar

55-65 psig

3.8-4.5 bar

70/21 90-105 psig

6.2-7.2 bar

60-70 psig

4.1-4.8 bar

80/27 95-110 psig

6.6-7.6 bar

65-85 psig

4.5-5.9 bar

90/32 105-125 psig

7.2-8.6 bar

65-95 psig

4.5-6.6 bar

100/38 115-150 psig

7.9-10.3 bar

70-105 psig

4.8-7.2 bar

220 - UnderCounter Part Number 000019553 Rev 00 04/26

K0270 SELFCONTAINED AIRCOOLED

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

Air Temp.

Entering

Condenser

°F/°C

Freeze Time Harvest

TimeWater Temperature °F/°C

50/10 70/21 90/32

70/21 11.0-12.6 12.8-14.7 14.5-16.5

1.0-2.5

80/27 11.3-12.9 13.1-15.0 14.8-16.9

90/32 12.6-14.3 14.8-16.9 17.0-19.3

100/38 14.1-16.1 17.0-19.3 19.8-22.5

110/43 15.2-17.4 19.8-22.5 23.6-26.8

Times in minutes

24 Hour Ice Production

Air Temp.

Entering

Condenser

°F/°C

Water Temperature °F/°C

50/10 70/21 90/32

70/21 280 lbs

127 kgs

245 lbs

111 kgs

220 lbs

100 kgs

80/27 275 lbs

125 kgs

240 lbs

109 kgs

215 lbs

98 kgs

90/32 250 lbs

113 kgs

215 lbs

98 kgs

190 lbs

86 kgs

100/38 225 lbs

102 kgs

190 lbs

86 kgs

165 lbs

75 kgs

110/43 210 lbs

95 kgs

165 lbs

75 kgs

140 lbs

64 kgs

Based on average ice slab weight of 2.44 – 2.75 lb (1107 – 1247 g).

Regular cube derate is 7%

Part Number 000019553 Rev 00 04/26 UnderCounter - 221

Operating Pressures

Air Temp. Entering

Condenser °F/°C

Freeze Cycle

Discharge Pressure

PSIG

Suction Pressure

PSIG

50/10 200-255 psig

13.8-17.6 bar

60-22 psig

4.1-1.5 bar

70/21 200-255 psig

13.8-17.6 bar

60-22 psig

4.1-1.5 bar

80/27 200-295 psig

13.8-20.3 bar

61-23 psig

4.2-1.6 bar

90/32 240-330 psig

16.5-22.8 bar

65-26 psig

4.5-1.8 bar

100/38 265-375 psig

18.3-25.9 bar

66-30 psig

4.6-2.1 bar

110/43 320-380 psig

22.1-26.2 bar

80-42 psig

5.5-2.9 bar

Suction pressure drops gradually throughout the freeze cycle

Air Temp. Entering

Condenser °F/°C

Harvest Cycle

Discharge Pressure

PSIG

Suction Pressure

PSIG

50/10 165-200 psig

11.4-13.8 bar

70-95 psig

4.8-6.6 bar

70/21 170-205 psig

11.7-14.1 bar

70-100 psig

4.8-6.9 bar

80/27 175-210 psig

12.1-14.5 bar

75-100 psig

5.2-6.9 bar

90/32 205-240 psig

14.1-16.5 bar

80-100 psig

5.5-6.9 bar

100/38 220-260 psig

15.2-17.9 bar

85-115 psig

5.9-7.9 bar

110/43 230-275 psig

15.9-19.0 bar

115-135 psig

7.9-9.3 bar

222 - UnderCounter Part Number 000019553 Rev 00 04/26

K0270 SELFCONTAINED WATERCOOLED

NOTE: These characteristics may vary depending on

operating conditions.

Cycle Times

Freeze Time + Harvest Time = Total Cycle Time

Air Temp.

Around Ice

Machine

°F/°C

Freeze Time Harvest

TimeWater Temperature °F/°C

50/10 70/21 90/32

70/21 10.6-12.2 12.3-14.0 13.5-15.4

1.0-2.5

80/27 10.8-12.4 12.6-14.3 13.8-15.7

90/32 11.0-12.6 12.8-14.7 14.1-16.1

100/38 11.3-12.9 13.1-15.0 14.5-16.5

Times in minutes

24 Hour Ice Production

Air Temp. Around Ice

Machine °F/°C

Water Temperature °F/°C

50/10 70/21 90/32

70/21 290 lbs

132 kgs

255 lbs

116 kgs

235 lbs

107 kgs

80/27 285 lbs

129 kgs

250 lbs

113 kgs

230 lbs

104 kgs

90/32 280 lbs

127 kgs

245 lbs

111 kgs

225 lbs

102 kgs

100/38 275 lbs

125 kgs

240 lbs

109 kgs

220 lbs

100 kgs

Based on average ice slab weight of 2.44 – 2.75 lb (1107 – 1247 g).

Regular cube derate is 7%

Condenser

Water

Consumption

90/32 Air Temperature Around Ice Machine

Water Temperature °F/°C

50/10 70/21 90/32

Gal/24 hours 240 410 2740

Water regulating valve set to maintain 240 PSIG discharge

pressure

Part Number 000019553 Rev 00 04/26 UnderCounter - 223

Operating Pressures

Air Temp. Around

Ice Machine °F/°C

Freeze Cycle

Discharge Pressure

PSIG

Suction Pressure

PSIG

50/10 235-245 psig

16.2-16.9 bar

52-24 psig

3.6-1.7 bar

70/21 235-245 psig

16.2-16.9 bar

54-24 psig

3.7-1.7 bar

80/27 235-250 psig

16.2-17.2 bar

56-24 psig

3.9-1.7 bar

90/32 235-255 psig

16.2-17.6 bar

58-24 psig

4.0-1.7 bar

100/38 235-260 psig

16.2-17.9 bar

60-24 psig

4.1-1.7 bar

Suction pressure drops gradually throughout the freeze cycle

Air Temp. Around

Ice Machine °F/°C

Harvest Cycle

Discharge Pressure

PSIG

Suction Pressure

PSIG

50/10 175-210 psig

12.1-14.5 bar

80-95 psig

5.5-6.6 bar

70/21 175-210 psig

12.1-14.5 bar

80-95 psig

5.5-6.6 bar

80/27 175-210 psig

12.1-14.5 bar

80-95 psig

5.5-6.6 bar

90/32 175-210 psig

12.1-14.5 bar

80-95 psig

5.5-6.6 bar

100/38 175-210 psig

12.1-14.5 bar

80-95 psig

5.5-6.6 bar

THIS PAGE INTENTIONALLY LEFT BLANK

Part Number 000019553 Rev 00 04/26 UnderCounter - 225

Wiring Diagrams

The following pages contain electrical wiring diagrams. Be

sure you are referring to the correct diagram for the ice

machine you are servicing.

Warning

Always disconnect power before working on electrical

circuitry.

Wiring Diagram Legend

The following symbols are used on all of the wiring

diagrams:

* Internal Compressor Overload

(Some models have external compressor

overloads)

** Fan Motor Run Capacitor

(Some models do not incorporate fan motor run

capacitor)

( ) Wire Number Designation

(The number is marked at each end of the wire)

—>>— Multi-pin Connection

(Electrical Box Side) —>

(Compressor Compartment Side)>—

Diagrams

226 - UnderCounter Part Number 000019553 Rev 00 04/26

KF0150/K0170 WIRING DIAGRAM

NOTE: Diagram shown in the freeze cycle

GND

(22)

(20)

(21)

(15)

(2)

(7)

(23)

(3)

(13)

(8)

(6)

(5)

(9)

(14)

(4)

(24)

(12)

(10) (11)

(C)

(S)

(R)

Part Number 000019553 Rev 00 04/26 UnderCounter - 227

KF0150/K0170 WIRING DIAGRAM LEGEND

Item Description

1 Control Board

2 Fuse

3 Transformer

4 On/Off /Clean Switch

5 Bin Switch

6 Bin Thermostat

7 High Pressure Cut Out

10 Harvest Solenoid Valve

18 Contactor Coil

19 Contactor Contacts

20 Compressor

21 Compressor Relay

23 Compressor Start Capacitor

25 Compressor Overload

27 Condenser Fan Motor

29 Fan Cycle Control

30 Water Pump

32 Ice Thickness Control

228 - UnderCounter Part Number 000019553 Rev 00 04/26

KF0250/K0270 WIRING DIAGRAM

NOTE: Diagram shown in the freeze cycle

GND

(22)

(20)

(21)

(46)

(2)

(7)

(23)

(3)

(45)

(8)

(6)

(5)

(9)

(14)

(4)

(24)

(12)

(49)

(47)

(44)

(10)

(48)

Part Number 000019553 Rev 00 04/26 UnderCounter - 229

KF0250/K0270 WIRING DIAGRAM LEGEND

Item Description

1 Control Board

2 Fuse

3 Transformer

4 On/Off /Clean Switch

5 Bin Switch

6 Bin Thermostat

7 High Pressure Cut Out

10 Harvest Solenoid Valve

18 Contactor Coil

19 Contactor Contacts

20 Compressor

21 Compressor Potential Relay

23 Compressor Start Capacitor

25 Compressor Overload - May be internal or external

27 Condenser Fan Motor

29 Fan Cycle Control

30 Water Pump

32 Ice Thickness Control

230 - UnderCounter Part Number 000019553 Rev 00 04/26

Wiring Diagram

KP0150/KP0250 - 1Ph Air-cooled

Part Number 000019553 Rev 00 04/26 UnderCounter - 231

Wiring Diagram

KP0150/KP0250 - 1Ph Air-cooled

Number Component

3 Bin Switch

5 Compressor

7 Compressor Overload

12 Compressor Start Capacitor

13 Compressor Start Relay

14 Condenser Fan Motor

17 Contactor Coil

18 Contactor Contacts

19 Control Board

25 Fan Cycle Control

26 Float Switch - Harvest

27 Float Switch-Water Level

28 Fuse

31 High Pressure Cutout

40 On/Off/Clean Switch

41 See Control Board Schematic For Detail

42 Solenoid Valve

49 Thermistor - J4

55 Water Dump Valve

56 Water Inlet Valve

58 Water Pump

Wire Colors

BLK Black

BLU Blue

BRN Brown

PNK Pink

PRPL Purple

RED Red

WHT White

YEL Yellow

Refer to control board schematic for control board detail

232 - UnderCounter Part Number 000019553 Rev 00 04/26

Electronic Control Board

Tubing Schematic

HEAT

EXCHANGER

AIR OR

WATER

CONDENSER

DRIER

RECEIVER

(WATER COOLED ONLY)

EXPANSION

VALVE

HARVEST SOLENOID

VALVE

EVAPORATOR

COMPRESSOR

STRAINER

10 AMP FUSE

DC VOLTAGE

ELECTRICAL PLUG

ICE THICKNESS PROBE

BIN SWITCH LIGHT

HARVEST LIGHT

AC LINE VOLTAGE

ELECTRICAL PLUG

MANITOWOC ICE

2110 SOUTH 26TH STREET

MANITOWOC, WI 54220

8005455720

WWW.KOOLAIRE.COM

Part Number 000019553 Rev 00 04/26

KOOLAIRE KDP0250A 220" Ice Maker With Bin, Cube-Style - /24 Hr Ice Production

Product's Documents

Manual

Specifications

KOOLAIRE KDP0250A Questions and Answers

Related Products

KOOLAIRE KDP0420W 220" Ice Maker, Cube-Style

KOOLAIRE KYP0420A 220" Ice Maker, Cube-Style

KOOLAIRE K00461 Ice Maker, Parts & Accessories

KOOLAIRE KDT0300A 30.00" Ice Maker, Cube-Style

KOOLAIRE KYT1700W 48.00" Ice Maker, Cube-Style

KOOLAIRE KYT0500A 30.00" Ice Maker, Cube-Style