Manitowoc IYT1500A261A - 48" Indigo NXT Series Air Cooled Modular Ice Machine

User Manual Manitowoc IDT1500A263E Ice Machine

Section 2 Installation

Installation

Location Requirements

The location selected for the ice machine head section must meet the following criteria. If any of these criteria are not met, select another location.

• The location must be indoors and must be free of airborne and other contaminants.
• The location must not be near heat- generating equipment or in direct sunlight.
• 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.

Installation Requirements

• The ice machine and bin must be level.
• Vent the ice machine and bin drains separately.
• Bin drain termination must have an air gap.
• The ice machine and bin must be descaled and sanitized after installation.
• The drain line must contain a union or other suitable means of disconnection at the ice machine.

QuietQube Models Only

• The ice machine top panel can be trimmed with an aviator snips to allow the line set, water line and electrical connections to exit the top. Only cut out what is needed, the back panel must support the top panel.
• The water inlet and electrical connection must contain a service loop to allow future access.

Air Baffle

Self-Contained Air-cooled Only

The air-cooled baffle prevents condenser air from recirculating.

To install:

1. Loosen the back panel screws next to the condenser.
2. Align the keyhole slots in the air baffle with the screw holes and slide the baffle down to lock in place.

Bin Installation Requirements

• The installation area must be capable of supporting the combined weight of the equipment and product.
• All ice machines installed on a bin require an ice deflector.
• Manitowoc bins have a deflector installed and require no modifications when used with a forward-facing evaporator.
• Ice machines with multiple evaporators require a deflector kit.
• Align sides and back of ice machine with sides and back of bin when placing ice machine on bin.
• Optional sales kits are available to adapt various sized or multiple ice machines on large bins.

Bin Installation

NOTE: When using casters, the units must be tethered or secured to comply with all applicable codes. Swivel casters must be mounted on the front and rigid casters must be mounted on the rear. Lock the front casters after installation is complete.

1. Remove threaded plug from drain fitting.
2. Screw the leveling legs onto the bottom of the bin.
3. Screw the foot of each leg in as far as possible.
4. Move the bin into its final position.
5. Level the bin to assure that the bin door closes and seals properly. Use a level on top of the bin. Turn the base of each foot as necessary to level the bin.
6. Inspect bin gasket prior to ice machine installation. (Manitowoc bins come with a closed cell foam gasket installed along the top surface of the bin.)
7. Remove all panels from ice machine before lifting and installing on bin. Remove front panel, top cover, left and right side panels.

Dispenser Installation

Observe following recommendations unless required by the dispenser manufacturer.

• An adapter is not required for ice machines that match the dispenser size.
• A deflector is not required.
• Ice level management is recommended to prevent water leakage or movement of ice machine during agitation.
• Align sides and back of ice machine with sides and back of dispenser when placing ice machine.
• Follow ice machine installation procedures in this manual and any additional installation requirements specified by the dispenser manufacturer.

Electrical Requirements

All electrical work, including wire routing and grounding, must conform to local, state and national electrical codes. The following precautions must be observed:

• The ice machine must be grounded.
• A separate fuse/circuit breaker dedicated circuit) must be provided for each ice machine head section, condenser or condensing unit.
• A qualified electrician must determine proper wire size dependent upon location, materials used and length of run (minimum circuit ampacity can be used to help select the wire size).

Voltage

The maximum allowable voltage variation is +10% / -5% of the rated voltage at ice machine start-up (when the electrical load is highest).

Fuse/Circuit Breaker

A separate electrical disconnect, which disconnects all poles and has 3 mm (1/8") contact separation, must be provided for fixed wiring. Circuit breakers must be H.A.C.R. rated in USA.

Minimum Circuit Ampacity

The minimum circuit ampacity is used to help select the wire size of the electrical supply. (Minimum circuit ampacity is not the ice machine’s running amp load.)

The wire size (or gauge) also depends on location, materials used, length of run, etc., so it must be determined by a qualified electrician.

Ground Fault Circuit Interrupter

We do not recommend the use of a GFCI/GFI circuit protection with our equipment. If a GFCI/GFI is required by code, use a GFCI/GFI breaker rather than an outlet, which is more prone to intermittent nuisance trips than panel circuit breakers.

Water Connections

• Local water conditions may require treatment of the water to inhibit scale formation, filter sediment, and remove chlorine odor and taste.
• Connect ice making water inlet to potable water only.
• Install a water shut-off valve for potable water and water cooled condenser lines.
• Do not connect the ice machine to a hot water supply. Verify hot water restrictors installed on other equipment are functioning correctly. (Check valves on sink, faucets, dishwashers, etc.)
• Install a water regulating valve if water pressure exceeds the maximum valve rating.
• Insulate water and drain lines to prevent condensation.

Cooling Tower Applications (Water-Cooled Models)

A water cooling tower installation does not require modification of the ice machine.

• Water pressure at the condenser cannot exceed 276 psig (1900 kPa).
• Water entering the condenser must not exceed 90°F (32°C).
• Water flow through the condenser must not exceed 5 gallons (19 liters) per minute.
• Allow for a pressure drop of 7 psi kPa) between the condenser water inlet and the outlet of the ice machine.
• Water exiting the condenser must not exceed 110°F (43°C).

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 foot (2.5 cm per meter) of run 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.
• Install a tee at the ice machine drain outlet and install an 18" (46 cm) vent above the drain line.
• Drain termination must have an air gap that meets local code.

Auxiliary Base Drain Installation

An auxiliary drain is located in the ice machine base to remove moisture in high humidity areas.

1. View the back of the ice machine base on the compressor side and locate and remove the cap plug.
2. Route tubing to an open site drain:

• Use 1/2 inch CPVC tubing.
• Apply a bead of silicone around the exterior of the ice machine tubing and insert into ice machine base. The silicone will secure the tubing and provide a watertight seal.
• Provide support for tubing.

REMOTE CONDENSER MODELS

Step 1 Secure the Condenser.

Through-holes are provided to secure the condenser to a curb, rack or wooden timber.

Step 2 Route the Refrigeration Tubing.

Route the refrigeration tubing between the ice machine head section and the condenser.

• Maximum line set exposed on rooftop is of total line set length.
• A qualified person must perform all roof penetrations.
• Interconnecting wire must be routed between the ice machine and condenser.

Step 3 Connect the Line Set.

In most cases, by routing the line set properly, shortening will not be necessary. When shortening or lengthening is required, do so before connecting the line set to the ice machine or the remote condenser. This prevents the loss of refrigerant in the ice machine or condenser.

The quick connect fittings on the line sets are equipped with access valves. Use these valves to recover any vapor charge from the line set.

When lengthening or shortening lines, follow good refrigeration practices, purge with nitrogen and insulate all tubing. Do not change the tube sizes. Evacuate the lines and place about 5 oz (145 grams) of vapor refrigerant charge in each line.

1. Remove the dust caps from the line set, condenser and ice machine.

2. Apply refrigeration oil to the threads on the quick-disconnect couplers before connecting them to the condenser.

3. Carefully thread the female fitting to the condenser or ice machine by hand, then tighten the couplings with a wrench until they bottom out.

4. Turn an additional quarter turn to ensure proper brass-to-brass seating. Torque to the following specifications:

5. Check all fittings and valve caps for leaks and reinstall and tighten caps.

6. Interconnecting line voltage wiring is used to energize and de-energize the condenser fan motor. The remote condenser voltage matches the ice machine head section voltage.

Installation is finished for remote condenser models. Proceed to page 32 for start-up procedure.

QUIETQUBE MODELS

Step 1 Secure the Condensing Unit.

Through-holes are provided to secure the condensing unit to a curb, rack or wooden timber.

Step 2 Route the Refrigeration Tubing.

Route the refrigeration tubing between the ice machine head section and the condenser or CVD condensing unit.

• A suction line oil trap is required when rise is more than 20 feet (6 meters).
• Only one trap is allowed in the line set.
• Shorten the line set as required, do not coil line set.

Step 3 Pressure Test and Evacuate Line Set and CVD Condensing Unit.

• Shutoff valves for the line set must remain closed until pressure testing and evacuation are complete.
• Valve core removal tools that allow for removal and installation of the valve cores without removing hoses for the manifold gauge set are recommended to decrease the evacuation time.
• Pressure test at 150 psi (1000 kPa) for a minimum of 15 minutes.
• Minimum evacuation level is 500 microns.

Pressure test the line sets and CVD Condensing Unit with 150 psi (1000 kPa) of dry nitrogen. Add nitrogen at the shutoff valves for the line set located at the back of the ice machine head section or from the access valves located in the CVD Condensing Unit. Complete the pressure test, verify no leaks are present and remove the nitrogen from the system before connecting the vacuum pump. Connect vacuum pump and evacuate system to 500 microns.

Step 4 Open Valves for the Line Set and Receiver.

You will not hear refrigerant flow when the valves are opened. Refrigerant will not flow until the ice machine is started and the solenoid valve opens.

• All valve caps must be reinstalled, tightened and leak-checked to assure no refrigerant leakage exists.
• Counterclockwise opens all valves. Open the shutoff valves for the suction and liquid lines.

Step 5 Leak-Check the Refrigeration System.

Step 6 Insulation Requirements.

• To prevent condensation, the entire suction line, including the shutoff valve, must be insulated.
• All insulation must be airtight and sealed at both ends.

Step 7 Insulation for the Suction Shutoff Valve.

The insulation for the suction shutoff valve is located in the plastic bag taped to the water curtain.

Step 8 Ice Beverage Models Only.

The thermostat probe must be moved from the shipping position to the ice-making position.

• The bin thermostat probe must be rotated down to enable ice contact and proper operation.
• Verify probe wire does not interfere with the water curtain.
• The control is preset and does not require programming.

1. Loosen thumbscrew securing probe.
2. Rotate the probe from horizontal to vertical position.
3. Tighten thumbscrew to secure probe.

Starting the Ice Machine

Starting the ice machine and completing the Operational Checks are the responsibilities of the owner/operator. Adjustments and maintenance procedures outlined in this manual are not covered by the warranty.

REMOVE ICE THICKNESS PROBE SHIPPING BRACKETS

Remove and discard shipping brackets before starting the ice machine.

MINIMUM/MAXIMUM SLAB WEIGHT

Adjust ice thickness to maintain the correct bridge thickness and “Minimum/Maximum Slab Weight” on page 41.

Section 3 Operation

Buttons

Power Button: Provides On/Off functions for the ice machine.

Lock/Unlock Button: Allows or prevents touchscreen navigation.

Cleaning Button: Initiates a cleaning cycle. Refer to Section 4 for details.

Touchscreen

Icons: Provide status indication and allow navigation by pressing the icon.

Setup Wizard

Screens will automatically advance after a selection is made or press the right arrow to advance one screen, press left arrow to go back one screen. All settings can be accessed and changed without the wizard by using menu screen navigation.

Ice Making Sequence of Operation

The power button must be depressed and the water curtain/ice dampers must be in place on the evaporator before the ice machine will start.

Water Purge Cycle

The ice machine purges any remaining water from the water trough down the drain.

Prechill Cycle

The refrigeration system cools the evaporator before the water pump is energized.

Freeze Cycle

Water flows across the evaporator and the refrigeration system chills the evaporator. Ice builds on the evaporator and the freeze cycle continues until the ice thickness probe senses a sheet of ice has formed. The ice thickness probe signals the control board to start a harvest.

Harvest Cycle

Any remaining water is purged down the drain as refrigerant gas warms the evaporator. When the evaporator warms, the sheet of cubes slides off the evaporator and into the storage bin. If all cubes fall clear of the water curtain (or ice damper) the ice machine starts another freeze cycle.

Off Cycle

If the water curtain or ice damper are held open by ice cubes the ice machine shuts off. When the water curtain or ice damper closes, the ice machine starts a new cycle at the water purge.

Control Board Timers

The control board has the following non- adjustable timers:

• The ice machine control board will set its own install date after 100 freeze and harvest cycles.
• The ice machine is locked into the freeze cycle for 6 minutes before a harvest cycle can be initiated.
• The maximum freeze time is 35 minutes at which time the control board automatically initiates a harvest sequence.
• The maximum harvest time is 7 minutes, the control board will perform a water thaw cycle and then return the ice machine to the freeze cycle.

Service Faults

Service Faults are stored and indicated by the control board after three cycles. The number of cycles required to stop the ice machine varies for each Service Fault.

• Long Freeze Cycle - If the freeze time reaches 35 minutes, the control board automatically initiates a harvest cycle. If 6 consecutive 35 minute freeze cycles occur, the ice machine stops.
• Long Harvest Cycle - If the harvest time reaches 7 minutes, the control board automatically returns the ice machine to the freeze cycle. After 3 consecutive long harvest cycles the ice machine stops.

Refer to Section 5 if you receive an alert for Service Fault E01 or E02.

Safe Operation Mode

Allows the ice machine to operate up to hours if the ice thickness probe and/or water level probe sensors fail.

• When the control board starts the safe mode, an alert is flashed on the display to notify the end-user they have a production problem.
• The control board automatically initiates and monitors the safe mode. The control will automatically exit the safe mode if a normal signal is received from the input.
• After 72 hours, the control board will enter a standby mode and turn off.

NOTE: The control board needs a five cycle history to operate safe mode. If five cycles have never been successfully completed the ice machine will shut-off.

Water Assist Harvest

When the damper/curtain does not open within 3.5 minutes in the harvest cycle the following occurs:

• 3.5 minutes - The water inlet valve energizes until water touches the high water level probe.
• 4 minutes - The water pump energizes.
• 6.5 to 7 minutes - The water dump valve energizes.

Water Thaw Cycle

When the damper/curtain does not open during the 7 minute harvest cycle the following water thaw cycle occurs:

• 7 minutes - The compressor, harvest solenoid valve and dump valve de- energize.

1. The water pump remains energized and the water inlet valve energizes until water touches the high water level probe.
2. Water is circulated over the evaporator.
3. Water is circulated, dumped and refilled to the high water level probe for approximately 1 hour.

• At the end of the thaw cycle the ice machine will start another freeze cycle approximately 1 - 1.75 hour).

Ice Thickness Check

After a harvest cycle, inspect the ice cubes in the ice storage bin. The ice thickness probe is factory-set to maintain the ice bridge thickness at 1/8" (3 mm).

NOTE: Make sure the water curtain 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 must be approximately mm) thick.
2. If adjustment is necessary, turn the ice thickness probe adjustment screw clockwise to increase bridge thickness, counterclockwise to decrease bridge thickness. Set a 7 mm (9/32") gap between ice thickness probe and evaporator as starting point, then adjust to achieve a 1/8" (3 mm) bridge thickness.

NOTE: Turning the adjustment one-third of a turn will change the ice thickness about mm).

Reverse Osmosis or Deionized Water

Usage

When using water with low total dissolved solid content (low TDS) the water level probe sensitivity can be increased by moving the jumper over one pin. The Electronic Control Board diagram shows the default position of the jumper covering the left and center pins. Moving the jumper to the center and right pins and enabling R.O. menu “Use less water with reverse osmosis” (Settings/Energy/ Water Usage/Use Less Water With Reverse Osmosis) will increase the sensitivity of the water level probe.

Section 4 Maintenance

Descaling and Sanitizing

General

You are responsible for maintaining the ice machine in accordance with the instructions in this manual. Maintenance procedures are not covered by the warranty.

Descale and sanitize the ice machine every six months for efficient operation. If the ice machine requires more frequent descaling and sanitizing, consult a qualified service company to test the water quality and recommend appropriate water treatment.

An extremely dirty ice machine must be taken apart for descaling and sanitizing. Manitowoc Ice Machine Cleaner/Descaler and Sanitizer are the only products approved for use in Manitowoc ice machines.

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. Wipe surfaces with a damp cloth rinsed in water to remove dust and dirt from the outside of the ice machine. If a greasy residue persists, use a damp cloth rinsed in a mild dish soap and water solution. Wipe dry with a clean, soft cloth.

The exterior panels have a clear coating that is stain resistant and easy to clean. Products containing abrasives will damage the coating and scratch the panels.

• Never use steel wool or abrasive pads for cleaning.
• Never use chlorinated, citrus based or abrasive cleaners on exterior panels and plastic trim pieces.

Remedial Cleaning Procedure

• This procedure descales all components in the water flow path, and is used between the bi-yearly detailed descaling and sanitizing procedure.

Detailed Descaling/Sanitizing Procedure

This procedure must be performed a minimum of once every six months.

• The ice machine and bin must be disassembled descaled and sanitized.
• All ice produced during the descaling and sanitizing procedures must be discarded.

Detailed Descaling and Sanitizing Procedure

Ice machine cleaner/descaler is used to remove lime scale and mineral deposits. Ice machine sanitizer disinfects and removes algae and slime.

NOTE: Although not required and dependent on your installation, removing the ice machine top cover may allow easier access.

Step 1 Open the front door to access the evaporator compartment. Ice must not be on the evaporator during the descaling/ sanitize cycle. Follow one of the methods below:

• Press the power switch at the end of a harvest cycle after ice falls from the evaporator(s).
• Press the power switch and allow the ice to melt.

Step 2 Remove all ice from the bin/ dispenser.

Step 3 Press the Clean button and select "Turn off when complete”. Water will flow through the water dump valve and down the drain. Wait approximately 1 minute until the water trough refills and the display indicates Add Chemical. Add the proper amount of ice machine cleaner/descaler to the water trough by pouring between the water curtain and evaporator, then confirm the chemical was added.

Step 4 Wait until the cycle is complete approximately 24 minutes). Then disconnect power to the ice machine (and dispenser when used).

Step 5 Remove parts for descaling.

Step 6 Mix a solution of cleaner/descaler and lukewarm water. Depending upon 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 descale all parts.

Step 7 Use half of the cleaner/descaler water mixture to descale all components. Use caution not to expose electrical connectors to liquid and soak parts for 5 minutes (15 - 20 minutes for heavily scaled parts). The solution will foam when it contacts lime scale and mineral deposits; once the foaming stops, use a soft-bristle nylon brush, sponge or cloth (NOT a wire brush) to carefully descale the parts. When descaling is complete rinse all removed components with clean water

Step 8 While components are soaking, use half of the solution to descale all food zone surfaces of the ice machine and bin or dispenser). Use a nylon brush or cloth to thoroughly descale the following ice machine areas:

• Side walls
• Base (area above water trough)
• Evaporator plastic parts - including top, bottom and sides
• Bin or dispenser

Rinse all areas thoroughly with clean water.

SANITIZING PROCEDURE

Step 9 Mix a solution of sanitizer and lukewarm water.

Step 10 Use half of the sanitizer/ water solution to sanitize all removed components. Fill a spray bottle and use caution not to expose electrical connectors to liquid and 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 11 Use half of the sanitizer/water solution to sanitize all food zone surfaces of the ice machine and bin (or dispenser). Use a spray bottle to liberally apply the solution. When sanitizing, pay particular attention to the following areas:

• Side walls
• Base (area above water trough)
• Evaporator plastic parts - including top, bottom and sides
• Bin or dispenser

Do not rinse the sanitized areas.

Step 12 Replace all removed components back into their original configuration and wait 20 minutes.

Step 13 Press the Clean button and select “Make ice when complete”. Water will flow through the water dump valve and down the drain. Wait approximately minute until the water trough refills and the display indicates Add Chemical. Add the proper amount of ice machine sanitizer to the water trough by pouring between the water curtain and evaporator, then confirm the chemical was added.

Step 14 Close and secure the front door. The ice machine will automatically start ice making after the sanitize cycle is complete approximately 24 minutes).

Parts Removal for Detailed Descaling and Sanitizing

Single evaporator is shown; Each evaporator will have a distribution tube and water curtain/damper.

A. Remove the water curtain(s)

• Gently flex the curtain in the center and remove it from the right side.
• Slide the left pin out.

B. Remove the ice thickness probe

• Compress the hinge pin on the top of the ice thickness probe.
• Pivot the ice thickness probe to disengage one pin then the other. The ice thickness probe can be descaled and sanitized at this point without complete removal. If complete removal is desired, disconnect the ice thickness control wiring from the control board.

C. Remove the water trough

• Depress tabs on right and left side of the water trough.
• Allow front of water trough to drop as you pull forward to disengage the rear pins.

D. Remove the water level probe

• Pull the water level probe straight down to disengage.
• Lower the water level probe until the wiring connector is visible.
• Disconnect the wire lead from the water level probe.
• Remove the water level probe from the ice machine.

E. Remove the water distribution tube(s)

NOTE: Thumbscrews for the distribution tube are retained to prevent loss. Loosen thumbscrews, but do not pull thumbscrews out of distribution tube.

• Loosen the two outer screws (do not remove screws completely because they are retained to prevent loss) and pull forward on the distribution tube to release from slip joint.
• Disassemble distribution tube by loosening the two (2) middle thumbscrews and dividing the distribution tube into two pieces.

Remedial Cleaning Procedure

This procedure descales all components in the water flow path, and is used to descale the ice machine between the bi-yearly detailed descaling and sanitizing procedure. Ice machine cleaner/descaler is used to remove lime scale and mineral deposits. Ice machine sanitizer disinfects and removes algae and slime.

NOTE: Although not required and dependent on your installation, removing the ice machine top cover may allow easier access.

Step 1 Ice must not be on the evaporator during the clean/sanitize cycle. Follow one of the methods below:

• Press the power switch at the end of a harvest cycle after ice falls from the evaporator(s).
• Press the power switch and allow the ice to melt.

Step 2 Open the front door to access the evaporator.

Step 3 Press the Clean button and select “Make ice when complete”. Water will flow through the water dump valve and down the drain. Wait approximately minute until the water trough refills and the display indicates Add Chemical. Add the proper amount of ice machine descaler to the water trough by pouring between the water curtain and evaporator, then confirm the chemical was added.

Step 4 Close and secure the front door. The ice machine will automatically start ice-making after the clean cycle is complete approximately 24 minutes).

Cleaning the Air Filter and Condenser

The washable filter on self-contained ice machines is designed to catch dust, dirt, lint and grease. Clean the filter once a month with mild soap and water.

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.
• 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).
• If dirt still remains, call a service agent to clean the condenser.

Removal from Service/Winterization

All Models

WATER-COOLED MODELS ONLY

• Disconnect the incoming water and drain lines from the water-cooled condenser.
• Insert a large screwdriver between the bottom spring coils of the water regulating valve and pry open the Water Regulating Valve.
• Hold the valve open and blow compressed air through the condenser until no water remains.

All Models

Section 5 Troubleshooting

Service Faults

In addition to the standard safety controls, such as the high pressure cutout, your Manitowoc ice machine features built- in service faults which 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. Press the power button. The display reads “Off”. Press the power button again, and the display reads “Making Ice”.

2. Allow the ice machine to run to determine if the condition repeats.

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