Reliance TS-310CX3 110 Non-Condensing Concentric Vent User Manual

If you have any questions, please

call or write to:

In the United States

500 Tennessee Waltz Parkway

Ashland City, TN 37015

Toll Free: 1-877-737-2840

On-Demand Water Heater

Installation Manual and Owner’s Guide

- Do not store or use gasoline or other

flammable vapors and liquids in the vicinity

of this or any other appliance.

- WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electric switch; do not

use any phone in your building.

• Immediately call your gas supplier from

a neighbor's phone. Follow the gas

supplier's instructions.

• If you cannot reach your gas supplier, call

the fire department.

- Installation and service must be performed

by a qualified installer, service agency or the

gas supplier.

WARNING

If the information in these

instructions is not followed

exactly, a fire or explosion may

result causing property damage,

personal injury or death.

Gas Tankless Water Heater

Suitable for potable water heating only

Suitable for recirculation with a crossover valve.

Not suitable to be used with a dedicated return line.

FEATURING

• ENDLESS HOT WATER

• ON-DEMAND USAGE

• COMPACT, SPACE SAVING

• ENERGY CONSERVATION

• COMPUTERIZED SAFETY

• ELECTRONIC IGNITION

• Complies with SCAQMD Rule

1146.2 for natural gas Low NOx

Emissions of 14 ng/J or 20-ppm

• CONCENTRIC VENT

• FIELD GAS CONVERSION

• X3™ TECHNOLOGY

Models

310CX3

510CX3

Series 110

ANSI Z21.10.3 ・ CSA 4.3

Keep this manual near the water heater for future reference whenever maintenance, adjustment, or

service is required.

2 Page

Contents

CONTENTS

Installation Manual

SPECIFICATIONS .............................................4

INTRODUCTION..............................................5

SAFETY GUIDELINES.....................................6

SAFETY DEFINITION ....................................6

GENERAL ......................................................6

INSTALLATION ................................................7

GENERAL ......................................................7

CLEARANCES ...............................................9

INCLUDED ACCESSORIES ............................9

OPTIONAL ITEMS ........................................ 9

WARNING FOR INSTALLATIONS ...............11

HIGH-ALTITUDE INSTALLATIONS .............12

VENTING INSTRUCTIONS .........................13

Vent length and no. of elbows .................14

DIP switch settings for vent length ...........14

Venting illustrations ..................................15

Vent termination clearances ....................16

Clearances for sidewall terminations .......17

Clearances for rooftop terminations ........17

GAS SUPPLY AND GAS PIPE SIZING ......... 18

General .....................................................18

Gas connections .......................................18

Natural gas supply piping .........................19

Propane (LP) supply piping ....................... 19

WATER CONNECTIONS .............................20

Pressure relief valve .................................20

X3™ Scale prevention technology ............21

ELECTRICAL CONNECTIONS ..................... 22

TEMPERATURE REMOTE CONTROLLER .....23

Optional item ............................................23

Installation ................................................ 23

APPLICATIONS .............................................. 25

INITIAL OPERATION .....................................26

Owner's Guide

OPERATING SAFETY .....................................28

NORMAL OPERATION ..................................30

BUILT-IN CONTROLLER

AND REMOTE CONTROLLER ..................30

GENERAL ....................................................30

TEMPERATURE SETTING ..........................31

Set temperature .......................................31

TEMPERATURE TABLE OF CONTROLLER .31

ADDITIONAL FEATURES ............................32

Information mode ....................................32

Unit conversion mode ..............................32

TEMPERATURE SETTINGS ON THE PCB ........33

FLOW .......................................................... 33

FREEZE PROTECTION SYSTEM ................. 34

MAINTENANCE AND SERVICE ..................35

INLET WATER FILTER CLEANING ........................ 35

MEASURING INLET GAS PRESSURE.................. 36

UNIT DRAINING & POWER OUTAGE (FREEZE

PROTECTION) .............................................. 37

TROUBLESHOOTING .....................................38

GENERAL ....................................................38

ERROR CODES ...........................................39

General .....................................................39

Fault Analysis of Error Codes .................... 40

COMPONENTS DIAGRAM ............................42

PARTS LIST .................................................... 46

OUTPUT TEMPERATURE CHART ..................48

3 Page

Installaon Manual

Installation ManualInstallation Manual

CONGRATULATIONS

Congratulations and thank you for choosing our tankless water heater.

Before use, we recommend that you read through this installation

manual carefully. Keep this manual for future reference.

If you need an additional manual, contact the manufacturer or your

local distributor. You may also download a manual from our web page.

When you call, please tell us the product name and the serial number

of your unit written on the rating plate of the water heater.

4 Page

Model

310CX3

(AT-K5U-CV-SCM)

510CX3

(AT-D3U-CV-SCM)

Natural Gas Input

(Operating Range)

BTU/h

Min.: 15,000

Max.: 190,000

Min.: 15,000

Max.: 199,000

Gas Connection 3/4" NPT

Water Connections 3/4" NPT

Water Pressure*

psi

(MPa)

15 - 150 (0.1 - 1)

Natural gas

Inlet Pressure

" W.C.

(kPa)

Min. 4.0 (1.00)

Max. 10.5 (2.61)

Weight lbs. (kg) 51 (23)

Dimensions

inch

H 20.5 x W 13.7 x D 10.5

H 520 x W 350 x D 266

Ignition Electric Ignition

Electric

Supply VAC / Hz 120/60

Consumption

Operation W / A 77/0.91 79/0.94

Standby W / A 2/0.05 2/0.05

Freeze-

Protection

W / A 113/0.94 114/0.95

SPECIFICATIONS

*Maximum flow may need water pressure equal to or above 40 psi.

NOTE:

• Check the rating plate to ensure this product matches your specifications.

• The manufacturer reserves the right to discontinue, or change at any time, specifications or designs

without notice and without incurring obligations.

Specicaons

Installaon Manual

The 310CX3/510CX3 models do not have Easy-Link or Multi-Unit capability.

NOTICE

5 Page

INTRODUCTION

• This manual provides information necessary for the installation, operation, and maintenance

of the water heater.

• The model description is listed on the rating plate which is attached to the side panel of the

water heater.

• Please read all installation instructions completely before installing this product.

• If you have any problems or questions regarding this equipment, consult the manufacturer or

its local representative.

• This appliance is an on-demand, tankless water heater. It is designed to efficiently supply

endless hot water for your needs.

• The 310CX3, and 510CX3 models are only to be installed indoors with concentric venting.

• The principle behind tankless water heaters is simple:

*This diagram illustrates tankless water heater design concepts only and does not accurately represent

the water heater’s physical description.

1. A hot water fixture is turned on.

2. Water flows through the X3™ Scale Prevention Technology cartridge.

3. The water flow sensor detects the water flow.

4. The computer initiates the fan motor and gas valve to let gas flow through the heater and sends a

signal to the igniter to create an ignition spark.

5. The gas ignites and flames appear within the burner chamber.

6. Water is heated as it flows through the heat exchanger.

7. Using thermistors to measure temperatures throughout the water heater, the computer modulates

the gas and water valves to ensure proper output water temperature and hot water outflows.

8. When the fixture is turned off, the unit shuts down.

Introducon

Installaon Manual

Burners

Hot water xture

Exhaust vent and

combuson air intake

collar

Heat exchanger

Gas valves

Fan motor

Flow adjustment valve

Computer board

Thermistor

Cold water inlet

Hot water outlet

Gas inlet

Thermistor

Burners

Flow sensor

Igniter

X3™

cartridge

6 Page

SAFETY GUIDELINES

SAFETY DEFINITION

GENERAL

1. Follow all local codes, or in the absence of local codes, follow the current edition of the National Fuel

Gas Code: ANSI Z223.1/NFPA 54.

2. Properly ground the unit in accordance with all local codes or in the absence of local codes, with the

current edition of the National Electrical Code: ANSI/NFPA 70.

3. Carefully plan where you intend to install the water heater. Please ensure:

• Your water heater will have enough combustion air and proper ventilation.

• Locate your heater where water leakage will not damage surrounding areas. (Please refer to page 8.)

4. Check the rating plate for the correct GAS TYPE, GAS PRESSURE, WATER PRESSURE and ELECTRIC

RATING. If this unit does not match your requirements, do not install and consult with the

manufacturer. The water heater is configured only for use with Natural Gas at the factory. If the

appliance is used with propane gas, conversion to propane gas with an included conversion kit (LP

Conversion Kit: 100357126) is required. The conversion must be done by a qualified service agent or

a gas utility service person in accordance with this instruction and all codes and requirements of the

authority having jurisdiction. Failure to follow instructions could result in property damage, serious

personal injury, or death. The agent performing this work assumes responsibility for this conversion.

(Refer to the gas conversion leaflet.)

5. If any problem should occur, turn off all hot water fixtures and turn off the gas. Then call a trained

technician, the gas company, or the manufacturer.

WARNING

• Water temperatures over 125 °F (52 °C) can cause severe burns instantly or death from

scalding. The water temperature is set at 120 °F (50 °C) from the factory to minimize any

scalding risk. Before bathing or showering always check the water temperature.

• To reduce the risk of scalding, install Thermostatic Mixing Valves (temperature limiting

valves) at each point of use.

• Do not store or use gasoline or other flammables, vapors, or liquids in the vicinity of this

appliance.

• Do not reverse the water and/or gas connections as this will damage the gas valves and

can cause severe injury or death. Follow the diagram on page 20 when installing your

water heater

• Failure to observe these warnings could result in severe personal injury or death.

Safety Guidelines

Installaon Manual

WARNING

Indicates an imminently hazardous situation which, if not avoided, could result in death or seri-

ous injury.

CAUTION

Indicates an imminently hazardous situation which, if not avoided, could result in minor or

moderate injury.

Indicates an imminently hazardous situation which, if not avoided, will result in death or serious

injury.

DANGER

Indicates information considered important but not hazard related.

NOTICE

7 Page

INSTALLATION

GENERAL

1. Follow all local codes, or in the absence of local codes, follow the current edition of the National

Fuel Gas Code: ANSI Z223.1/NFPA 54.

2. All gas water heaters require careful and correct installation to ensure safe and efficient operation.

This manual must be followed exactly. Read the "Safety Guidelines" section.

3. The manifold gas pressure is preset at the factory. It is computer controlled and should not need

adjustment.

4. Maintain proper space for servicing. Install the unit so that it can be connected or removed easily.

Refer to the "Clearances" section on page 9 for proper clearances.

5. Electrical service to the water heater requires a means of disconnection. This will allow power to

the water heater to be shut off for servicing and safety purposes.

6. Install the water heater so it is level (left-to-right & front-to-back) and plumb (vertically).

7. Do not install the unit where the exhaust vent is pointing into any opening in a building or where

the noise may disturb your neighbors. Make sure the vent termination meets the required distance

from any doorway or opening to prevent exhaust from entering a building. (Refer to pages 11, 16,

and 17.) Check local code requirements prior to installation.

8. Carefully plan the installation location of the heater and vent terminations. Contaminants such

as aerosols, lint, and fine powders (including flour) can clog the air intake. This could reduce the

operation of the fan, causing improper combustion and reduced life of the water heater. Ensure

that the area around the heater, vent termination, and air intake is free of dust, debris , other

contaminants. Regular maintenance is recommended in environments with these items in the air.

9. The venting system shall be installed in accordance with the water heater manufacturer's

instructions and vent system manufacturer's instructions.

10. A condensate collector and trap (100266140 & 100266139) are required to be installed in the

venting system when there is more than 8 ft (2.4 m) of equivalent vent length, not including the

sidewall termination. 87° elbow is equivalent to 5 ft (1.5 m) of vent length. The condensate

collector must be installed on the heater's flue. The condensate trap and collector are required on

all vertical installations. See the illustrations on page 15.

11. Only install the water heater in a heated area where below freezing temperatures cannot occur.

12. When an existing Category I appliance is removed or replaced, the original venting system may no

longer be sized to property vent the attached water heater. An improperly sized venting system

may cause formation of condensate, leakage, and spillage and so on.

Installaon

Installaon Manual

• The conversion to propane must be done by a qualified service agent or a gas utility

serviceman in accordance with this instruction and all codes and requirements of the

authority having jurisdiction. Failure to follow instructions could result in serious injury

or property damage. The qualified agent performing this work assumes responsibility

for this conversion.

• Do not use this appliance if any part has been in contact with or been immersed in

water. Immediately call a qualified installer or service agency to replace a flooded water

heater. Do not attempt to repair the unit. It must be replaced.

• Should overheating occur or the gas supply fails to shut off, turn off the manual gas

control valve to the appliance.

• Do not disconnect the electrical supply if the ambient temperature will drop below

freezing unless the water has been drained from the water heater. The Freeze

Protection System only works if the unit has electrical power. The warranty will not

be covered if the heat exchanger is damaged due to freezing. Refer to the sections on

Freeze Protection System on page 34 and on Unit Draining & Power Outage (Freeze

Protection) on page 37 for more information.

• Failure to observe this warning could result in severe personal injury or death.

WARNING

8 Page

Installaon

Installaon Manual

• The warranty will not cover damage caused by water quality.

- Only potable water can be used with this water heater. Do not introduce pool or

spa water, or any chemically treated water into the water heater.

- Introduction of water with iron greater than 0.3 mg/L.

- Water pH levels must be between 6.5 and 8.5.

- Well water must be treated.

• Although the water heater is designed to operate with minimal sound, the manufacturer

does not recommend installing the unit on a wall adjacent to a bedroom, or a room

that is intended for quiet study or meditation, etc.

• Locate your water heater close to a drain where water leakage will not do damage to

surrounding areas. As with any water heating appliance, the potential for leakage at

some time in the life of the product does exist. A drain pan, or other means of protection

against water damage, is recommended to be installed under the water heater in case

of leaks. In addition, you may install an active water leak detector with a shutoff valve

which can turn off the water supply in the event of a leak. The manufacturer is not

responsible for damage due to water leaks. If you install a drain pan under the unit,

ensure that it will not restrict the combustion air flow.

• This water heater is not suitable for combination water (potable) heating, space heating

and/or a recirculation system with a dedicated return line.

NOTICE

• Installation and service must be performed by a qualified installer (for example, a

licensed plumber or gas fitter). Otherwise, the warranty will be void.

• The installer (licensed professional) is responsible for the correct installation of the

water heater and for compliance with all national, state/provincial, and local codes.

• The manufacturer does not recommend installing the water heater in a pit or

location where gas and water can accumulate.

• Do not attach the gas line to the water heater until after the gas line system pressure

test for leaks has been completed. See page 18 for additional information.

• Do not have the vent terminal pointing toward any operating window, door, or

opening into a building or other area where people gather, where combustion gases

could create a nuisance or hazard or cause property damage.

• Do not install next to any source of airborne debris, such as a clothes dryer, that can

cause debris to be trapped inside the combustion chamber.

• Do not install the unit where water, debris, or flammable vapors may get into the flue

terminal or the air intake line.

• The manufacturer does not recommend installing the water heater in an attic due

to safety issues. If you install the water heater in an attic:

- Make sure the unit will have enough combustion air and proper ventilation.

Failure to do so could lead to carbon monoxide poisoning or death.

- Keep the area around the water heater clean. When dust collects on the flame

sensor, the water heater will shut down on an error code.

- Place the unit where it will allow easy access for service and maintenance.

- A drain pan, or other means of protection against water damage, is recommended

to be installed under the water heater in case of leaks. See the NOTICE below.

• The water heater must be securely mounted to a wall or other suitable structure so

that it is level (left-to-right & front-to-back) and plumb (vertically).

• Failure to observe these warnings could result in severe personal injury, death,

and/or property damage.

WARNING

9 Page

CLEARANCES

Top Bottom Front Back Sides

12 in

(305 mm)

18 in

(458 mm)

4 in*

(102 mm)

1 in

(25 mm)

3 in

(76 mm)

*24 inches (610 mm) recommended for maintenance.

OPTIONAL ITEMS

Model

Condensate Collector and Trap

Concentric Sidewall Termination Kit

Concentric Roof Termination

Elbow

Straight Pipe

Roof Flashing

Pipe Hanger

Remote Controller

X3™ Cartridge Anti-Freeze Kit

INCLUDED ACCESSORIES

Installaon

Installaon Manual

Top

Back

Side

Front

Bo�om

Check that these items below are included with the water heater.

Installation manual

& Owner’s guide

™

cartridge

LP Conversion Kit (100357126)

Pressure relief

valve

Qty: 1

100314491

100281157

Manifold aachments: 2 Small / 1 Large

Manifold gasket (100281157): 1

Gas conversion scker: 1

Gas conversion instrucon: 1

Spare screw: 2

Maintain all clearances around the water

heater. Failure to do so could create a fire

hazard, potentially leading to death, serious

injury, and/or property damage.

WARNING

10 Page

1. Condensate Collector and Trap

3. Concentric Roof Termination

Installaon

Installaon Manual

7. Pipe Hanger (100266141)

4. Elbow

8. Remote Controller (100209924/TM-RE42)

This remote can be added to the heater,

in addition to the built-in controller.

Collector

(100266140)

Trap

(100266139)

6. Roof Flashing

Flat Roof

Flashing

(100266187)

2. Concentric Sidewall Termination Kit

Tile / Shingle Roof Flashing

1/12 to 6/12 Pitch (100266136)

8/12 to 16/12 Pitch (100266137)

6/12 to 12/12 Pitch (100266138)

45° Elbow

(100266119)

87° Elbow

(100266132)

5. Straight Pipe

10" (254 mm) (100266133)

19.5" (495 mm) (100266134)

39" (991 mm) (100266135)

38" (965 mm)

(100266118)

18" (457 mm)

(100305170)

This kit is recommended for cold environment

installation to protect the X3™ Cartridge. The

kit includes a 120 volt heat trace wire and an

insulation blanket.

9. X3™ Cartridge Anti-Freeze Kit (100325654)

It includes one Sidewall Termination*, one 87° Elbow,

two Wall Plates, one Flue Adapter

11 1/2" (100322374)

21" (100322375)

**The flue adapter must be used in a vent system of 8

ft (equivalent) or less. NOTICE: The flue adapter MUST

ONLY be installed in the water heater flue. It cannot be

used at any other location in the vent system. Vertical

installations do not require this flue adapter.

The flue adapter can be made in the field using a 10"

straight pipe (100266133) by removing 1.5" of the

outer plastic pipe from the male end. If using other

commercially available metal/plastic concentric vent-

ing, remove 1.5" of the outer plastic pipe by following

the manufacturer's instructions.

Flue Adapter**

(100322379)

*This sidewall termina-

tion should be installed

with the label printed

"TOP" facing up and the drain hole of the termination

facing down to prevent rainwater from entering the air

intake and exhaust system.

11 Page

FOR YOUR SAFETY, READ BEFORE INSTALLATION:

Do not install the water heater or vent

termination next to a dryer or dryer vent. The

water heater environment must be free from

any source of airborne debris that can be

trapped inside the water heater.

Installaon

Installaon Manual

Locate the vent terminal to meets the following

clearances: 2 ft from an inside corner

2 ft from an outside corner

3 ft below a soffit/overhang

WARNING FOR INSTALLATIONS

1 � min.

1 � min. 1 � min.

1 � above grade and

above an�cipated snow level

An�cipated snow level

Ensure that you meet the minimum clearances shown below for a direct vent termination:

Improper installation will void the warranty and may cause damage to the water heater.

NOTICE

WARNING

• Do not install the water heater and its termination where water, debris or

flammable vapors may get into the water heater and flue terminal.

• Do not have the vent terminal pointing toward any opening into a building.

• Do not locate your heater in a pit or location where gas and water can

accumulate.

• Failure to observe these warnings could result in carbon monoxide poisoning

or death.

Outside

corner

Inside

corner

3 ft

min.

2 ft

min.

2 ft

min.

12 Page

HIGH-ALTITUDE INSTALLATIONS

The black squares indicate the correct DIP switch positions for high altitude installation.

310CX3 : Only adjust DIP switch No. 3, No. 4, and No. 5.

510CX3 : Only adjust DIP switch No. 2, No. 3, and No. 4 on the lower bank.

WARNING

• Adjust the appropriate DIP switches according to model and elevation as

shown below. DO NOT adjust the other DIP switches.

• Turn off the power supply to the water heater before changing the DIP

switch settings.

• Failure to observe these warnings could lead to carbon monoxide poisoning

or death.

Bank of DIP switches

310CX3

Computer board

Lower bank of DIP switches

510CX3

Computer board

Installaon

Installaon Manual

Installation altitude

The maximum certified or allowable installed altitude is 10,100 ft (3,078 m) for

310CX3, and 510CX3 models.

0 to 2,000 ft

(0 to 609 m)

DEFAULT

2,001 ft to

3,000 ft

(610 m to

914 m)

3,001 ft to

5,000 ft

(915 m to

1,524 m)

5,001 ft to

7,500 ft

(1,525 m to

2,286 m)

7,501 ft to

10,100 ft

(2,287 m to

3,078 m)

310CX3

No. 3 : OFF

No. 4 : OFF

No. 5 : OFF

No. 3 : OFF

No. 4 : ON

No. 5 : OFF

No. 3 : OFF

No. 4 : OFF

No. 5 : ON

No. 3 : OFF

No. 4 : ON

No. 5 : ON

No. 3 : ON

No. 4 : ON

No. 5 : ON

510CX3

(Lower bank of

DIP switches)

No. 2 : OFF

No. 3 : OFF

No. 4 : OFF

No. 2 : OFF

No. 3 : ON

No. 4 : OFF

No. 2 : OFF

No. 3 : OFF

No. 4 : ON

No. 2 : OFF

No. 3 : ON

No. 4 : ON

No. 2 : ON

No. 3 : ON

No. 4 : ON

Altitude

Model

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 6 7 8 9 10

OFF

1 2 3 4 5 6 7 8 9 10

OFF

1 2 3 4 5 6 7 8 9 10

OFF

1 2 3 4 5 6 7 8 9 10

OFF

1 2 3 4 5 6 7 8 9 10

13 Page

Installaon

Installaon Manual

VENTING INSTRUCTIONS

WARNING

• Improper venting of this appliance can result in excessive levels of carbon

monoxide which can result in severe personal injury or death.

• Improper installation can cause nausea or asphyxiation, severe injury or death

from carbon monoxide and flue gases poisoning. Improper installation will void

product warranty.

• When installing the vent system, all applicable national and local codes must be

followed. If you install thimbles, fire stops or other protective devices and they

penetrate any combustible or noncombustible construction, be sure to follow

all applicable national and local codes.

The water heater must be vented in accordance with "Venting of Equipment" in the current edition of the

National Fuel Gas Code: ANSI Z223.1/NFPA 54 as well as applicable local building codes.

The water heater is designed for a concentric venting system, which uses one pipe system with two

ducts for combustion air and exhaust air. The manufacturer approves the use of Centrotherm Eco

Systems Direct Vent APNC35 venting systems on new installations. This system is furnished through

the heater manufacturer. See the table below for certified vent terminations.

General rules for venting water heaters:

• Place the water heater as close as possible to the vent termination.

• Do not weld the vent pipe to the water heater’s vent collar.

• Do not cut the vent collar of the unit.

• The vent must be easily removable from the top of the water heater for normal service and

inspection of the unit and vent system.

• The water heater vent must not be connected to any other gas appliance or vent stack.

• Avoid using an oversized vent pipe or using extremely long runs of the pipe.

• Do not common vent or connect any vent from other appliances to the water heater vent.

• The vent should slope towards the heater and condensate collector (100266140). The

condensate trap (100266139) must be installed below the condensate collector's drain nipple to

keep condensate from draining back into the heater's exhaust and causing damage. These two

venting components must be installed in roof top terminations and when horizontal terminations

exceed 8 feet (2.4 m) of equivalent vent length, excluding the sidewall termination. Condensate

is corrosive and should be treated and disposed of according to local codes. The condensate

collector and condensate trap need periodical maintenance according to the manufacturer's

instructions.

General rules for vent terminations:

• Avoid locating the water heater vent termination near any air intake devices. These fans can

pick up the exhaust flue products from the water heater and return them to the building. This

can create a health hazard.

• Locate the vent termination so that it cannot be blocked by any debris and snow, at any time.

Most codes require that the termination must be at least 12 in (305 mm) above grade and

anticipated snow line, but the installer may determine if it should be higher depending on the

job site condition and applicable codes.

• A proper sidewall termination is required when the water heater is vented through a sidewall.

• Regarding the clearances from the exhaust termination to the air inlet or opening, refer to

pages 11, 16, and 17.

Use Vent Brand Description Model Number

New Installation

(New Venting)

Centrotherm

Eco Systems

Direct Vent

APNC35

11-1/2" Concentric, Sidewall Termination* Kit

100322374

21" Concentric, Sidewall Termination* Kit

100322375

38" Roof Termination

100266118

18" Roof Termination

100305170

*This sidewall termination should be installed with the label printed "TOP" facing up and the drain hole of the ter-

mination facing down to prevent rainwater from entering the air intake and exhaust system.

14 Page

Installaon

Installaon Manual

-Vent length and no. of elbows-

• For best results, a vent system should be as short and straight as possible.

• This water heater must be vented with approved concentric venting as described on page 13.

• Follow the vent pipe manufacturer's instructions and the instructions in this manual when install-

ing the vent pipe.

• Do not common vent this appliance with any other vented appliance. (Do not terminate vent inside

a chimney. If the vent must go through the chimney, it must run through the top of the chimney and

terminate with the roof termination listed on page 10. Install per the vent manufacturer's instructions.)

• When the horizontal vent run exceeds 5 ft (1.5 m), support the vent run at 3 ft (0.9 m) intervals with

overhead hangers.

• The maximum length of exhaust vent piping must not exceed 43 ft (13.1 m) (deducting 5 ft (1.5 m)

for each 87° elbow used in the venting system). Do not use more than 4 pieces of 87° elbows.

-DIP switch settings for vent length-

WARNING

• Adjust the appropriate DIP switches according to model and vent length as

shown below. DO NOT adjust the other DIP switches.

• Turn off the power supply to the water heater before changing the DIP

switch settings.

• Failure to observe these warnings could lead to carbon monoxide poisoning

or death.

Vent type Diameter

Max. No. of

87° Elbows

Max. Vertical and

Horizontal (Total)

Vent Length

Concentric 3 in/5 in 4 43 ft (13.1 m )

For each 87° elbow added, deduct 5 ft (1.5 m) from max. vent

length. Two 45° elbows are equivalent to one 87° elbow.

No. of 87°

Elbows

Max. Vertical

or Horizontal Vent Length

0 43 ft (13.1 m)

1 38 ft (11.6 m)

2 33 ft (10.1. m)

3 28 ft (8.5 m)

4 23 ft (7.0 m)

Excludes the Concentric termination

310CX3:

Only adjust DIP switch No. 6 , No. 7, and No. 8.

510CX3:

Only adjust DIP switch No. 3, No. 4, and No. 5 on the upper bank.

0 to 8 ft

(0 to 2.4 m)

DEFAULT

8 to 20 ft

(2.5 to 6.1 m)

20 to 30 ft

(6.2 to 9.1 m)

30 to 43 ft

(9.2 to 13.1 m)

310CX3

OFF

1 2 3 4 5 6 7 8 9 10

No. 6 : OFF

No. 7 : OFF

No. 8 : ON

OFF

1 2 3 4 5 6 7 8 9 10

No. 6 : ON

No. 7 : OFF

No. 8 : ON

OFF

1 2 3 4 5 6 7 8 9 10

No. 6 : OFF

No. 7 : ON

No. 8 : ON

OFF

1 2 3 4 5 6 7 8 9 10

No. 6 : ON

No. 7 : ON

No. 8 : ON

510CX3

(Upper bank

of DIP

switches)

1 2 3 4 5 6 7 8

OFF

No. 3 : OFF

No. 4 : OFF

No. 5 : ON

OFF

1 2 3 4 5 6 7 8

No. 3 : ON

No. 4 : OFF

No. 5 : ON

OFF

1 2 3 4 5 6 7 8

No. 3 : OFF

No. 4 : ON

No. 5 : ON

OFF

1 2 3 4 5 6 7 8

No. 3 : ON

No. 4 : ON

No. 5 : ON

Vent

length

Model

The black squares indicate the correct DIP switch positions for vent length.

510CX3 Computer board

Upper bank of

DIP switches

NOTE: If an 87° elbow connects to the vent collar directly, the connection is equivalent to 15 ft (4.6 m)

of vent length. When using this connection, be sure to calculate total vent length including the con-

nection part as 15 ft (4.6 m).

15 Page

-Venng illustraons-

The condensate trap and collector are required when there is more than 8 ft (2.4 m) of equivalent vent length,

excluding the vent termination. For details of

the venting installation, refer to the Centrotherm Eco Systems

Direct Vent APNC35 concentric venting installation manuals. X3™ CARTRIDGE is not shown.

Installaon

Installaon Manual

Horizontal Installation

Vertical Installation

Elbow

87°:100266132

45°:100266119

Condensate Trap &

Collector**

100266139&100266140

Roof termination

38" (965 mm): 100266118

18" (457 mm): 100305170

Tile / Shingle Roof Flashing

1/12 to 6/12 pitch: 100266136

8/12 to 16/12 pitch: 100266137

6/12 to 12/12 pitch: 100266138

Flat: 100266187

Pipe

Hanger

100266141

Pipe Hanger

100266141

Configuration B

Vent length greater than 8 ft

Configuration A

Vent length 8 ft (equivalent) or less

* This sidewall termination should be installed with the label printed "TOP" facing up and the drain hole of the

termination facing down to prevent rainwater from entering the air intake and exhaust system.

**Condensate must be disposed of according to local code.

Configuration DConfiguration C

Straight Pipe

10" (254 mm): 100266133

19.5" (495 mm): 100266134

39" (990 mm): 100266135

Condensate Trap &

Collector**

100266139&100266140

Sidewall

termination*

Condensate Trap &

Collector**

100266139&100266140

Straight Pipe

10" (254 mm) : 100266133

19.5" (495 mm) : 100266134

39" (990 mm) : 100266135

Flue Adapter

100322379

NOTICE: The

Condensate Trap &

Collector may be used

in place of the Flue

Adapter.

Standard Sidewall kit*

11.5" (292 mm):100322374

21" (533 mm):100322375

(Refer to page 10.)

16 Page

Installaon

Installaon Manual

15 �

Inside

corner detail

Fixed

closed

Fixed

closed

Operable

Regulator vent outlet

In the event no regulator is present,

H and I can be disregarded

Legend:

= Vent terminal

= Air supply inlet

= Area where terminal is not permi�ed

Direct vent

A Clearance above grade, veranda, porch, deck, or balcony 1 ft (30 cm)

B Clearance to window or door that may be opened

1 ft

(30 cm)

C Clearance to permanently closed window 0

Vertical clearance to ventilated soffit located above

the terminal within a horizontal distance of 2 ft (61

cm) from the center line of the terminal

3 ft (91 cm)

E Clearance to unventilated soffit 3 ft (91 cm)

F Clearance to outside corner 2 ft (61 cm)

G Clearance to inside corner 2 ft (61 cm)

Clearance to each side of center line extended above

meter/regulator assembly

I Clearance to service regulator vent outlet *

Clearance to non-mechanical air supply inlet to

a building or the combustion air inlet to any other

appliance.

1 ft

(30 cm)

K Clearance to mechanical air supply inlet

3 ft (91 cm) above if within

10 ft (3 m) horizontally.

Clearance above paved sidewalk or paved driveway

located on public property

7 ft (213 cm)

M Clearance under veranda, porch deck, or balcony 1 ft (30 cm)**

*Clearance in accordance with local installation codes and the requirements of the gas supplier.

**Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.

Notes:

1) In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code

2) If locally adopted installation codes specify clearances different than those illustrated, then the most stringent clearance

shall prevail.

3) Blocking air supply and exhaust vent by snow may cause incomplete combustion and an appliance failure. Install the

termination by providing sufficient clearance from anticipated snow line in accordance with local code or manufacture's

instructions and make sure there in no blockage.

4) Provide an appropriate clearance between a vent termination and a building to prevent degradation to building materials

caused by flue gases.

-Vent terminaon clearances-

17 Page

-Clearances for sidewall terminaons-

-Clearances for rooop terminaons-

Multiple-unit, concentric wall

terminals: Space each concentric

wall terminal at least 1 ft (30 cm)

away from each other, no matter

the orientation. A concentric wall

terminal must also be at least 2 ft

(61 cm) away from an inside corner.

If the adjacent wall is less than 2

ft (61 cm) of length, the minimum

required distance away from the

inside corner will be equal to the

length of that adjacent wall.

Concentric wall terminals

should be at least 2 ft (61

cm) away from an opposite

surface/wall. Do not place the

termination directly in front of

an opening into a building.

Concentric wall

terminals should be at

least 3 ft (91 cm) away

from a ventilated or

unventilated soffit.

Installaon

Installaon Manual

Inside

corner

Anticipated snow level

1 ft

(30 cm)

min.

2 ft

(61 cm)

min.

1 ft (30 cm)

min.

2 ft

(61 cm)

min.

3 ft

(91 cm)

min.

Improper installation can result in carbon monoxide poisoning or death. Follow all local

and national codes in regards to proper termination clearances. In the absence of such

codes, the clearances below can be used as guidelines. Local codes supersede these

guidelines.

WARNING

Angled roof termination

Intake air

Exhaust

gas

Exhaust

gas

5 ft (152 cm) min.

1 ft

(30 cm)

min.

1 ft

(30 cm)

min.

Anticipated

snow level

Flat roof termination

Intake airIntake air

Exhaust

gas

Exhaust

gas

2 ft (61 cm)

min.

1 ft

(30 cm)

min.

Anticipated

snow level

2 ft (61 cm) min.

1 ft

(30 cm)

min.

Vertical

wall

• Minimum spacing between multiple concentric terminals for rooftop:

- On the same level: 2 ft (61 cm) spacing between each

- On the different level: 5 ft (152 cm) spacing between each

• The exhaust termination must be a horizontal distance of at least 2 ft (61 cm) from

a wall or surface unless specified differently by local code.

• Failure to observe this warning may result in severe personal injury or death.

WARNING

1 ft

(30 cm)

min.

18 Page

GAS SUPPLY AND GAS PIPE SIZING

-General-

• Do not use this water heater with any gas other than the one listed on the rating

plate unless the water heater has been properly converted.

• Ensure that any and all gas regulators used are operating properly and providing

gas pressures within the specified range shown below. Excess gas inlet pressure

may cause serious accidents.

• If your water heater needs a gas conversion, refer to the instructions supplied with

the heater and included with the conversion components.

• Failure to observe these warnings could result in severe personal injury, carbon

monoxide poisoning, or death.

WARNING

• The minimum and maximum inlet gas pressures

Gas type Inlet gas pressure

Natural Gas Min. 4.0" W.C. (1.00 kPa) – Max. 10.5" W.C. (2.61 kPa)

Propane Min. 8.0" W.C. (1.99 kPa) – Max. 14.0" W.C. (3.48 kPa)

• Inlet gas pressures that fall outside the range of values listed above may adversely affect the

performance of the water heater. These pressures are measured when the water heater is in full

operation and in standby.

• Inlet gas pressure must not exceed the above maximum values; gas pressure above the specified range

will cause dangerous operating conditions and damage to the unit.

• Until testing of the main gas line supply pressure is completed, ensure the gas line to the water heater

is disconnected to avoid any damage to the water heater.

• If the gas supply pressure to the heater is greater than the specified maximum, a field-supplied

regulator is required. The regulator must lower the gas pressure within the approved range.

- Install the gas regulator according to the manufacturer's instructions.

- The regulator must be sized for the water heater input and provide the specified pressures that

are listed on the rating plate.

- In the absence of a minimum installation distance stated by the regulator manufacturer, it is

recommended that there is at least 3 ft (1 m) of piping between the regulator outlet and the

water heater's inlet gas connection.

-Gas connecons-

1. Install a full port, manual gas shutoff valve between the water heater and the gas supply line.

2. When the gas connections are completed, it is necessary to perform a gas leak test either by applying

soapy water to all gas fittings and observing for bubbles or by using a gas leak detection device.

• The water heater and its individual shutoff valve must be disconnected from the gas supply

piping system during any pressure testing of that system at test pressures in excess of 1/2 psi

(3.5 kPa).

• The water heater must be isolated from the gas supply piping system by closing its individual

manual shutoff valve during any pressure testing of the gas supply piping system at test

pressures equal to or less than 1/2 psi (3.5 kPa).

3. Always purge the gas line of any debris and/or water before connecting to the gas inlet.

Size the gas pipe to supply the necessary volume of gas for the water heater. Refer

to and follow the requirements listed in the current edition of ANSI Z223.1/NFPA

54. Otherwise, flow capabilities and output temperatures will be limited.

NOTICE

Installaon

Installaon Manual

19 Page

Based on Energy

Content of 1,000

BTU/Cubic ft:

Divide each

appliance's BTU/h

requirement by

1,000 BTU/ft

to get

the appliance's ft

requirement.

Take into account

the distance the

appliance is from

the gas meter, then

look in the above

gas chart to properly

size the line.

For sections of the

gas line supplying gas to more than one appliance (Ex: Point A to Point B), add up the cubic ft per hour requirements

of the appliances that are being supplied by that section, and size to the farthest appliance.

For Example: The section from A to B supplies gas to the furnace, range and dryer. Adding up the BTU/h requirements

and dividing by 1,000 yields a cubic ft per hour requirement of 220 cubic ft of gas per hour. The farthest appliance

is the range, which is 50 ft (15.2 m) away from the meter. According to the chart above, the 50 ft (15.2 m) column

shows that Section A to B must be 1" in order to supply 220 cubic ft per hour.

Water

heater

199,000 BTU/h

Dryer

35,000 BTU/h

Gas meter

Furnace

120,000 BTU/h

Range

65,000 BTU/h

A B

10' (3.1 m) Length

1/2" Pipe size

15' (4.6 m) Length

1/2" Pipe size

15' (4.6 m) Length

1" Pipe size

10' (3.1 m) Length

3/4" Pipe size

10' (3.1 m) Length

1" Pipe size

5' (1.5 m) Length

1-1/4" Pipe size

10' (3.1 m) Length

3/4" Pipe size

5' (1.5 m) Length

1-1/4" Pipe size

Gas sizing example

(Natural Gas)

Installaon

Installaon Manual

Pipe Size Length: ft (m)

Diameter:

10'

(3.1)

20'

(6.1)

30'

(9.1)

40'

(12.2)

50'

(15.2)

60'

(18.3)

70'

(21.3)

80'

(24.4)

90'

(27.4)

100'

(30.5)

125'

(38.1)

150'

(45.7)

200'

(61.0)

1/2"

172 118 95 81 72 65 60 56 52 50 44 40 34

3/4"

360 247 199 170 151 137 126 117 110 104 92 83 71

678 466 374 320 284 257 237 220 207 195 173 157 134

1-1/4"

1,309 957 768 657 583 528 486 452 424 400 355 322 275

1-1/2"

2,090 1,430 1,150 985 873 791 728 677 635 600 532 482 412

4,020 2,760 2,220 1,900 1,680 1,520 1,400 1,300 1,220 1,160 1,020 928 794

Unit: Cubic feet per hour

-Natural gas supply piping-

Maximum delivery Capacity of Cubic Feet of Gas per Hour of IPS Pipe carrying Natural Gas with 0.60 Specific Gravity

Based on Pressure Drop of 0.5" W.C.

Based on Energy Content of 1,000 BTU/Cubic ft: The water heater requires 190 Cubic ft/hr for 310CX3, and 199

Cubic ft/hr for the 510CX3 model.

Unit: kBTU per hour

Pipe Size

Length: ft (m)

Diameter:

10'

(3.1)

20'

(6.1)

30'

(9.1)

40'

(12.2)

50'

(15.2)

60'

(18.3)

70'

(21.3)

80'

(24.4)

90'

(27.4)

100'

(30.5)

125'

(38.1)

150'

(45.7)

200'

(61.0)

1/2"

268 184 148 126 112 101 93 87 82 77 68 62 53

3/4"

567 393 315 267 237 217 196 185 173 162 146 132 112

1,071 732 590 504 448 409 378 346 322 307 275 252 213

1-1/4"

2,205 1,496 1,212 1,039 913 834 771 724 677 630 567 511 440

1-1/2"

3,307 2,299 1,858 1,559 1,417 1,275 1,181 1,086 1,023 976 866 787 675

6,221 4,331 3,465 2,992 2,646 2,394 2,205 2,047 1,921 1,811 1,606 1,496 1,260

-Propane (LP) supply piping-

Maximum Capacity of Propane (LP) Based on 11" W.C. supply pressure at a 0.5" W.C. pressure drop

20 Page

Installaon

Installaon Manual

WATER CONNECTIONS

5. There is a wire mesh filter within the cold inlet to trap debris from entering your heater. This will need

to be cleaned periodically to maintain optimum flow. (Refer to page 35.)

All pipes, pipe fittings, valves and other components, including soldering materials, must be suitable for

potable water systems.

1. A manual shutoff valve must be installed on the cold water inlet to the water heater between the

main water supply line and the water heater.

2. In addition, a manual shutoff valve is also recommended on the hot

water outlet of the unit. Isolation valves with hose bibbs

for service are available.

3. If the water heater is installed within, or subjected to, a

closed loop water system, a thermal expansion tank or a

code approved device to handle thermal expansion must be

installed. NOTE: If the plumbing system is subject to water

hammer, then it is recommended that water hammer arrestors

be installed.

Do not use this appliance if any part has been under water. Immediately contact a

qualified installer or service agency to replace a flooded water heater. Do not attempt

to repair the unit! It must be replaced!

WARNING

Do not reverse the hot outlet and cold inlet connections to the water heater. This will

prevent the water heater from activating properly.

NOTICE

4. Before installing the water heater, flush the water line to remove all debris, and after installation is

complete, purge the air from the line. Failure to do so may cause damage to the water heater.

-Pressure relief valve-

The water heater has a high-temperature shutoff switch built in as a standard safety feature (called a

Hi-Limit switch) therefore a "pressure only" relief valve is required.

• An approved pressure relief valve is supplied with your water heater and must be installed on the

outlet connection. NOTE: When an isolation valve kit that includes a pressure relief valve is installed

on the water heater, use the provided ¾" male NPT plug to close the pressure relief port on the

outlet connection.

• The discharge piping for the pressure relief valve must be directed so that the hot water cannot

splash outward and cause damage or personal injury.

• Attach the discharge tube to the pressure relief valve and run the end of the tube to within 6 in

(152 mm) from the floor. This discharge tube must allow free and complete drainage without any

restrictions. WARNING! Do Not plug the pressure relief valve.

• If the pressure relief valve discharges periodically, this may be due to thermal expansion in a closed

water supply system. Contact the water supplier or a local plumbing professional on how to correct

this situation.

• The pressure relief valve must be manually operated periodically to check for correct operation.

Before operating the valve manually, check that it will discharge in a place for secure disposal.

• No valve must be placed between the relief valve and the water heater.

If another pressure relief valve is used or needs to be replaced, it must meet the following:

• The pressure relief valve must conform to ANSI Z21.22 · CSA 4.4 and installation must follow local

codes.

• The discharge capacity must be at least 190,000 BTU/h for the 310CX3 model, and 199,000 BTU/h

for the 510CX3 model.

• The pressure relief valve needs to be rated for a maximum of 150 psi (1 MPa).

Gas

inlet

Cold

inlet

Drain plug

with ﬁlter

Hot

outlet

Pressure

relief valve

21 Page

-X3™ Scale Prevention Technology-

This water heater is equipped with X3

™

Scale Prevention Technology to inhibit scale formation within

the heat exchanger tubing of this unit. Part of the X3

™

Technology’s anti-scale protection comes from

the special X3

™

Cartridge media. The X3

™

Cartridge must be installed into the manifold located on

the underside of the heater cabinet prior to operation of the unit (shown as follows). The X3

™

system

is designed to be hassle-free; eliminating the need to drain the heater for installation, removal, or

replacement of the cartridge. X3

™

Scale Prevention Technology reduces the formation of scale in the

heat exchanger, extending the operating life of the unit in typical potable water installations. Specific

water conditions may impact the efficiency of X3

™

, such as excessive iron (>0.3 mg/l). Consult a water

quality expert to determine if your water is within acceptable X3

™

and EPA guidelines.

™

Technology Installation/Removal

Installation -

1. Align the symbol with the symbol and insert the X3™ Cartridge into the X3™ manifold

2. Turn it right until the symbol aligns with the symbol.

Removal -

1. Close the shutoff valve on the cold water supply.

2. Turn off the power supply.

3. Open a hot water fixture to relieve water pressure in the heater.

4. If a drain pan is not installed, place a bucket or pan underneath the X3™ Cartridge as some water

may be present when removing.

5. Turn the X3™ Cartridge left until the symbol aligns with the symbol.

6. Pull down to remove it from the water heater. It is normal for a small amount of water to drip.

NOTE: the cartridge will be full of water. Take care to not tilt it till you can drain the water.

WARNING

Hot water could be released when the pressure relief valve is opened. This

could result in severe personal injury. Before operating the pressure relief

valve manually, check that it will discharge in a safe place. If water does not

flow freely from the end of the discharge pipe, turn the gas supply and power

OFF and call a qualified person to determine the cause.

Refer to the pressure relief valve manufacturer's instructions for inspection and

maintenance requirements.

REMOVALINSTALLATION

Installaon

Installaon Manual

22 Page

ELECTRICAL CONNECTIONS

• Follow the electrical code requirements of the local authority having

jurisdiction. In the absence of such requirements, follow the current edition

of the National Electrical Code ANSI/NFPA 70.

• When servicing or replacing parts within the water heater, label all wires

prior to disconnection to facilitate an easy and error-free reconnection.

Wiring errors can cause improper and dangerous operation. Verify proper

operation after servicing.

• Failure to observe these warnings could result in personal injury or loss of life.

WARNING

All concentric vent models come with a power plug.

1. The water heater requires 120 VAC, 60 Hz electrical power supply that is properly grounded.

A proper disconnect (i.e. on/off switch, power plug, etc.) controlling the main power to the water

heater must be provided for service reasons. (Must comply with local codes.)

2. The use of a surge protector is recommended in order to protect the unit from power surges.

Installaon

Installaon Manual

23 Page

TEMPERATURE REMOTE CONTROLLER

-Oponal item-

• The remote controller is an oponal accessory that can be installed in a hall, closet, etc., to allow for

temperature adjustment without having to go to the heater.

• When installed, the remote will take priority over the built-in controller.

Verify that the items listed below are included with the remote controller 100209924 (TM-RE42).

Temperature

remote controller

Screws Fork terminals Manual

Qty: 1

Qty: 2

Qty: 4

Qty: 1

-Installaon-

• This remote controller is NOT waterproof.

• The water heater can only have one remote controller.

• Do not install in high temperature environments, high humidity conditions, outdoors,

in direct sunlight, or within the reach of children.

• Make sure the remote controller does not come into contact with water or oil.

WARNING

• Do not place the remote controller cable close to other wires from other products.

• Cables used for the remote controller connection must be:

- Minimum 20 gauge wire (No polarity)

- Maximum 400 ft (122 m) long

NOTICE

1. Take off the Back plate from the remote controller with a flat head screwdriver. (Fig. A and B)

2. Attach the Back plate on the wall with the two provided screws. (Fig. B)

Fig. B

Back plate

3-1/4 inches

(82.6 mm)

Attach the screws

Cut out the partition with pliers

Main body

Fig. A

Main body

Twist

Press and twist flat head

screwdriver against the cutout.

Installaon

Installaon Manual

24 Page

3. Crimp the Fork terminals to the cable. (Fig. C)

4. Tighten the two Fork terminals beneath the two

Remote controller terminal screws on the back of the

main body. (Fig. D-1)

5. Cut out the inlet for the remote controller cable from

the bottom of the main body. (Fig. D-2)

6. Place the Main body back on the Back plate, with the

Remote controller cable running out of the bottom

inlet.

Remote controller

terminals

Fig. D-1

Two fork terminals

Remote controller cable

Inlet for the remote

controller cable

Cut out

Fig. D-2

1. Disconnect power supply from the water heater.

2. Take off the water heater’s front cover.

3. Locate the two terminals for the remote controller in the water heater. (Refer to the Fig. E-1 and E-2.)

4. Put the remote controller cable through the hole at the bottom of the casing of water heater from

outside.

5. Secure both terminals on the controller cable to the terminals in the cabinet as shown below.

(Secure them underneath the screw terminals. No polarity.) See Figures E-1 and E-2.

* Do NOT jump or short-circuit the wires, or the computer will be damaged.

6. Replace the water heater's front cover securely.

7. Reconnect power supply to the water heater.

Installaon

Installaon Manual

Remote controller cable

1-3/8 Inch

(35 mm)

Fig. C

1-5/8 Inch

(41 mm)

Fork

Terminals

310CX3

Fig. E-1

100209924

(TM-RE42)

Connect other end to

these terminals.

510CX3

Fig. E-2

100209924

(TM-RE42)

Connect other end to

these terminals.

25 Page

Applicaons

Installaon Manual

APPLICATIONS

Below are suggested piping diagrams for a standard installation and one with the use of a crossover valve.

These diagrams are just a suggestion. Check with local codes and ordinances for additional installation

requirements. Refer to the water heater manufacturer’s website for additional layouts.

Thermostatic mixing valves may be used with tankless water heaters. Consult with the mixing valve

manufacturer for the appropriate mixing valve for the application.

To reduce the risk of scalding, install Thermostatic Mixing Valves (temperature limiting valves) at each

point of use.

These models are suitable for (potable) water heating only.

These models do not have Easy-Link or Multi-Unit capability.

NOTE: Installation with a dedicated return line is not approved by the manufacturer.

This installation is approved with the use of a

crossover valve that maintain water temperature

at the valve below 110°F, such as the APCOM®

Bypass Valve for Tankless Water Heaters, model

TBPV (kit 100327167).

NOTE: The cross over valve and pump do not come

with the water heater. Install per pump manufac-

turer's instructions.

-Standard installation- -Recirculation with cross over valve-

COLD

WATER

SUPPLY

GAS

HOT WATER

TO FIXTURES

COLD

WATER

SUPPLY

EXPANSION

TANK

Y-STRAINER

AIR

VENT

GAS

CROSS OVER

VALVE

PRESSURE RELIEF

VALVE

DRAIN

BALL VALVE

CHECK VALVE

COLD

HOT

GAS

TEMPERATURE &

PRESSURE RELIEF

VALVE

CIRCULATION PUMP

LEGEND

26 Page

INITIAL OPERATION

IF YOU SMELL GAS:

• Do not try to start the water heater.

• Do not touch any electric switches; do not use any phone in your building.

• Immediately call your gas supplier from a neighbor’s phone. Follow the gas

supplier’s instructions.

• If you cannot reach your gas supplier, call the fire department.

WARNING

Operation

Once the above checks have been completed, please clean

the filter of any debris. Refer to page 35 for instructions.

Fully open the manual water control valve on the water

supply line.

Open a hot water tap to verify that water is flowing to that

tap, then close the hot water fixture.

Open the manual gas control valve fully.

Turn on the 120 VAC, 60 Hz power supply to the water

heater.

• Check the GAS and WATER CONNECTIONS for leaks before firing unit for the first time.

• Open the main gas supply valve to the unit using only your hand to avoid any spark. Never use

tools. If the knob will not turn by hand, do not try to force it; call a qualified service technician.

Forced or attempted repair may result in a fire or explosion due to gas leaks.

• Be sure to check for the presence of leaking gas toward the bottom of the unit because some gases

are heavier than air and may settle towards the floor.

• Check the GAS PRESSURE. Refer to page 18.

• Do not try to light the burner manually. It is equipped with an electronic ignition device which

automatically lights the burner.

• Check for PROPER VENTING and COMBUSTION AIR to the water heater.

• Purge the GAS and WATER LINES to remove any air pockets.

• Do not use this appliance if any part has been under water. Immediately contact a qualified

installer or service agency to replace a flooded water heater. Do not attempt to repair the unit! It

must be replaced!

FOR YOUR SAFETY, READ BEFORE OPERATING

Inial operaon

Installaon Manual

NOTE:

To reduce the risk of scalding, install Thermostatic Mixing Valves (temperature limiting valves) at

each point of use.

27 Page

Owner's GuideOwner's Guide

Owner's Guide

CONGRATULATIONS

Congratulations and thank you for choosing our tankless water heater.

Before use, we recommend that you read through this owner's guide

carefully. Keep this manual for future reference.

If you need an additional manual, contact the manufacturer or your

local distributor. You may also download a manual from our web page.

When you call, please tell us the product name and the serial number

of your unit written on the rating plate of the water heater.

28 Page

Operang Safety

Owner's Guide

OPERATING SAFETY

WARNING:

If you do not follow these instructions exactly, a re or explosion may result

causing property damage, personal injury or loss of life.

A. This appliance does not have a pilot. It is equipped with an ignition device which automatically

lights the burner. Do not try to light the burner by hand.

B. BEFORE OPERATING smell all around the appliance area for gas. Be sure to smell next to

the oor because some gas is heavier than air and will settle on the oor.

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electric switch; do not use any phone in your building.

• Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s

instructions.

• If you cannot reach your gas supplier, call the re department.

C. Use only your hand to turn the gas shuto󰀨 valve. Never use tools. If the valve will not turn by

hand, don’t try to repair it, call a qualied service technician. Force or attempted repair may result

in a re or explosion.

D. Do not use this appliance if any part has been under water. Immediately contact a qualied

installer or service agency to replace a ooded water heater. Do not attempt to repair the unit! It

must be replaced!

1. STOP! Read the safety information above on this label.

2. Turn o󰀨 all electric power to the appliance.

3. Do not attempt to light the burner by hand.

4. Turn the gas shuto󰀨 valve located on the outside of the unit to the closed position.

5. Wait ve (5) minutes to clear out any gas. If you then smell gas, STOP! Follow “B” in the

safety information above on this label. If you don’t smell gas, go to the next step.

6. Turn the gas shuto󰀨 valve located on the outside of the unit to the open position.

7. Turn on all electrical power to the appliance.

8. If the appliance will not operate, follow the instructions in “To Turn O󰀨 Gas to Appliance,” and

call your service technician or gas supplier.

1. Turn o󰀨 all electric power to the appliance if service is to be performed.

2. Turn the gas shuto󰀨 valve located on the outside of the unit to the closed position.

FOR YOUR SAFETY READ BEFORE OPERATING

OPERATING INSTRUCTIONS

TO TURN OFF GAS TO APPLIANCE

29 Page

Operang Safety

Owner's Guide

Vapors from ammable liquids will explode and catch re causing death or severe burns.

Do not use or store ammable products such as gasoline, solvents or adhesives in the same

room or area near the water heater.

Read and follow water heater warnings and instructions. If the owner’s manual is missing,

contact the retailer or manufacturer.

1. Water temperature over 125°F (52°C) can cause severe burns instantly or death from

scalds.

2. Children, disabled and elderly are at highest risk of being scalded.

3. Feel water before bathing or showering.

4. Temperature limiting valves are available. See manual.

5. To reduce the risk of scalding, install Thermostatic Mixing Valves (temperature limiting valves) at each

point of use.

6. The outlet temperature of the water heater is set at 120°F (50°C). If you require water temperatures

below this setting, follow the instruction manual.

7. Use this heater at your own risk. Test the water before bathing or showering. Do not leave children or

an inrm person unsupervised.

BRÛLURE

BURN

CHAUDECHAUDE

HOTHOT

CHAUDE

HOT

DANGER

BURN

FLAMMABLES

Flammable Vapors

A pressure relief valve listed as complying with the standard for Relief Valve and Automatic Gas

Shuto󰀨 Devices for Hot Water Supply System, ANSI Z21.22 • CSA 4.4, shall be installed at the time of

installation of the water heater in the location specied by the manufacturer. Local codes shall govern

the installation of relief devices for safety operation of the water heater. The relief valve must not be

removed or plugged.

No valve shall be placed between the relief valve and the water heater. The relief from the discharge

of the pressure relief valve shall be disposed of in a suitable place where it will cause no damage.

Also, there shall be no other reducing coupling or other restrictions installed on the discharge line to

restrict ow.

Before operating the pressure relief valve manually, check that hot water coming out of the relief valve

will discharge in a safe place to avoid contact with hot water and water damage.

See Installation Manual heading “PRESSURE RELIEF VALVES” for installation and maintenance of

relief valve discharge line and other safety precautions.

30 Page

NORMAL OPERATION

Normal Operaon

Owner's Guide

BUILT-IN CONTROLLER and REMOTE CONTROLLER

The illustraons below show examples of the displays of the controller. The exact display may dier

from examples.

"COLD" Button

"HOT" Button

Press the "HOT" button or the "COLD"

button to set the hot water temperature.

STAND BY LED (Orange)

The indicator is ON to show that

power is ON.

IN USE LED (Green)

The indicator lights during combustion.

"INFO" Button

Each time the button is pressed,

the operation mode is selected

in the sequence of the following.

Inlet water

temperature

Outlet water

temperature

Water

flow

When the STAND BY LED is ON, the

hot water temperature will be

displayed.

Display for Temperature

"ON/OFF" Button

Press this button to

start or stop operation.

Built-in controller

Remote controller

• When the remote controller is installed it will take priority over the built-in controller.

• The controller has an energy saving mode. Five minutes after the water heater stops

operating, the backlight of the controller turns off.

• The backlight of the remote will turn back on once the water heater begins firing again.

NOTICE

GENERAL

1. Open a cold water

fixture.

2. Mix hot water with the cold water

to get the correct temperature water.

3. When finished, close the

water fixtures.

• Flow rate to activate the water heater: 0.5 gallon per minute at the default set

temperature (1.9 L/min).

• Flow rate to keep the water heater running: 0.4 gallon per minute (1.5 L/min).

NOTICE

• Temperatures above 125 °F (52 °C) can cause severe burns or death from scalding.

Children, disabled and the elderly are at high risk of being injured.

• To reduce the risk of scalding, install Thermostatic Mixing Valves (temperature limit-

ing valves) at each point of use.

WARNING

°F 120 125 130 135 140 145 150 155

°C 49 52 54 57 60 63 66 68

Time to produce

serious burn

than 5

min.

1½ to 2

min.

about

30 sec.

about

10 sec.

less than

5 sec.

less than

3 sec.

about

1½ sec.

about

1 sec.

31 Page

TEMPERATURE SETTINGS

-Set temperature-

Normal Operaon

Owner's Guide

TEMPERATURE TABLE OF CONTROLLER

°F 100 105 110 115 120* 125 130 135 140

°C 38 40 43 45 50* 52 55 57 60

a) 310CX3

°F 100 105 110 115 120* 125 130 135 140 145 150 155 160

°C 38 40 43 45 50* 52 55 57 60 63 65 68 70

b) 510CX3

*Factory setting (Default): 120 °F

Operation

Screen on the controller

Built-in controller Remote controller

Turn on the 120 VAC power supply to the unit.

Press the "ON/OFF" button on the controller in order to turn the

controller on.

When ON, the STAND BY LED is lit.

It shows the set temperature on its display as shown in the picture

on the right. (EX.: 120 °F)

(EX.: 120 °F)

Press the "HOT" button or the "COLD" button to set the temperature

setting of the unit.

WARNING! Higher temperatures increase the risk of scalding,

but even at 120 °F (50 °C), hot water can scald (page 6).

Increasing temperature from 120 °F (50 °C) to 125 °F (52 °C) :

1. The water heater must be in Stand By to increase the temperature.

2. Press the "HOT" button to set 120 °F (50 °C).

3. Press and hold the "INFO" button and the "HOT" button for at

least 3 seconds. The remote will emit a beep and change to

125 °F (52 °C).

4. Press the "HOT" button to set up to 140 °F (60 °C).

-510CX3 only-:

Increasing temperature above 140 °F (60 °C)

To reduce the risk of scalding, install Thermostatic Mixing Valves

(temperature limiting valves) at each point of use.

1. The water heater must be in Stand By to increase the temperature.

2. Press the "HOT" button to set 140 °F (60 °C).

3. Press and hold the "INFO" button and the "HOT" button for at

least 3 seconds. The remote will emit a beep and change to 145

°F (63 °C).

4. Press the "HOT" button to set up to 160 °F (70 °C).

32 Page

ADDITIONAL FEATURES

-Informaon mode-

You can get some information about the water heater condition by pressing the "INFO" button. For

more information, follow the procedures below:

INFO

Button

Operation

Screen on the controller

Built-in controller Remote controller

1st. press

Inlet water temperature will be displayed on

the remote controller by pressing the "INFO"

button.

2nd. press

Outlet water temperature will be displayed on

the remote controller by pressing the "INFO"

button.

3rd. press

Water flow will be displayed on the remote

controller by pressing the "INFO" button.

4th. press

Press the "INFO" button to finish information

mode.

Inlet water

temperature

Outlet water

temperature

Water flow

Normal Operaon

Owner's Guide

-Unit conversion mode-

Units of measure can be changed from Imperial to Metric and vice versa. For example, temperature can

be changed from °F to °C. Flow rate will also change from gallons per minute to liters per minute when

this setting is changed. Follow this procedure to change this setting:

Operation

Screen on the controller

Built-in controller Remote controller

Press the "ON/OFF" button on the controller in

order to turn the controller on.

When ON, the orange LED is lit.

The previous set temperature will be displayed on

the screen.

Press the "INFO" buttons for at least 3 seconds.

The set temperature should now be displayed in the

alternate unit of measurement.

(EX.: 100 °F)

(EX.: 38 °C)

33 Page

TEMPERATURE SETTINGS ON THE PCB

(WITHOUT CONTROLLER)

WARNING

• DO NOT adjust the upper bank of DIP switches for the 510CX3 model.

• Turn off the power supply to the water heater before changing the DIP switch set-

tings.

• Failure to observe these warnings could result in carbon monoxide poisoning, severe

personal injury, or death.

• There are 2 preset temperatures, 120 °F (50 °C) and 140 °F (60 °C), that you can select by changing

the DIP switch settings on the computer board without the controller. See below.

• To reduce the risk of scalding, install Thermostatic Mixing Valves (temperature limiting valves) at each

point of use.

• When the controller is in normal operation, the set temperature of the controller is given priority over

the set temperature of the DIP switch settings.

NOTE: The black square indicates the correct DIP switch position for set temperature. For the

310CX3, only adjust DIP switch No. 9. For the 510CX3, only adjust DIP switch No. 5 on the lower

bank. Do not adjust the other DIP switches for temperature adjustment.

The temperature has been preset at the factory to 120 °F (50 °C).

DIP switches

Computer board

120 °F (50 °C)

DEFAULT

140 °F (60 °C)

No. 9 : OFF

No. 9 : ON

310CX3

OFF

1 2 3 4 5 6

7 8 9

OFF

1 2 3 4 5 6 7 8 9 10

Lower bank of

DIP switches

Computer board

Upper bank of

DIP switches

(Lower bank of DIP switches)

120 °F (50 °C)

DEFAULT

140 °F (60 °C)

No. 5 : OFF No. 5 : ON

510CX3

OFF

1 2 3 4 5 6

OFF

1 2 3 4 5 62 3 4 5 6

Normal Operaon

Owner's Guide

Appliance/Use

Flow rate

GPM (US) L/min

Lavatory Faucet 1.0 3.8

Bath Tub 4.0 – 10.0 15.2 - 37.8

Shower 2.0 7.5

Kitchen Sink 1.5 5.6

Dishwasher 1.5 5.6

Washing machine 4.0 15.2

Household Flow Rates

Taken from UPC 2006

FLOW

• The flow rate through the water heater is limited to a

maximum of 8.0 GPM (30 L/min) for the 310CX3, and

10.0 GPM (38 L/min) for the 510CX3.

• The temperature setting, along with the supply

temperature of the water, will determine the flow

rate output of the unit.

• Please refer to the temperature vs. gallons per

minute charts on page 48 to determine the likely flow

rates based on your local ground water temperature

and your desired outlet water temperature.

• Refer to the right-hand table for typical household

plumbing fixture flow rates to determine what the

water heater can do in a household application.

34 Page

• This unit comes equipped with heating blocks to protect it from damage associated with freezing. When

the freeze protection thermostat/the thermo switch senses air temperature below approximately 36.5

°F (2.5 °C), the blocks will heat up to prevent freezing of the unit.

• To operate these freeze protection systems, there has to be electrical power to the unit. Damage

to the heat exchanger caused by freezing temperatures due to power loss is not covered under the

warranty. In cases where power losses can occur, consider the use of a backup power supply. In the

event of a power outage during freezing conditions, the manufacturer recommends draining water

(page 37) from the water heater and disconnecting power.

• It is the installer’s responsibility to be aware of freezing issues and take all preventative measures. The

manufacturer will not be responsible for any damage to the heat exchanger as a result of freezing.

• If you will not be using your heater for a long period of time or power has been lost during freezing

conditions:

1. Completely drain the water out of the unit. Refer to page 37.

2. Disconnect power to your heater.

This will keep your unit from freezing and being damaged.

FREEZE PROTECTION SYSTEM

Normal Operaon

Owner's Guide

• Only pipes within the water heater are protected by the freeze protection system.

Any water pipes (hot or cold) located outside the unit will not be protected.

Properly protect and insulate these pipes from freezing.

• The freeze protection system does not protect the X3™ Cartridge. Install the X3

Cartridge Anti-Freeze Kit, 100325654. Refer to page 10.

NOTICE

35 Page

Maintenance & Service

Owner's Guide

MAINTENANCE AND SERVICE

• Turn off the electrical power supply and close the manual gas shutoff

valve and the manual water control valve before servicing.

• Failure to do so could result in serious personal injury or death.

WARNING

• Regularly ensure that the area around the water heater, vent termination, and air intake is free from

dust, debris, and other contaminants.

• Clean the cold-water inlet filter. (Refer to "Inlet water filter cleaning" on the following section.)

• Be sure that all openings for combustion and ventilation air are not blocked.

• The venting system should be checked annually for any leaks, corrosion, blockages or damage.

• The vent termination must be inspected regularly to make sure it isn't blocked by any debris, dirt, dust,

snow, etc. Immediately clear any blockages.

• Keep the area around the water heater and terminations clear. Remove any combustible materials,

gasoline, flammable vapors, and liquids.

• If the relief valve discharges periodically, it may be due to thermal expansion in a closed water supply

system. Contact a service technician to correct this situation.

• The pressure relief valve must be manually operated periodically to check for correct operation.

Before operating the valve manually, check that it will discharge in a place for secure disposal.

• The condensate drain system must be inspected regularly that it drains properly accordance with local

codes or the part manufacturer's instructions if it is installed. (Refer to page 15.)

• The burner should be checked annually for dust, lint, grease or dirt.

• Visually check the burner flames (see below) through the burner window in the burner assembly

located at the middle of the water heater.

Sasfactory

Blue ame

Unsasfactory

Flame liing

above the

burner

Unsasfactory

Red or Yellow

ame

The manufacturer recommends having the unit checked once a year or as necessary by a licensed

technician. If repairs are needed, any repairs should be done by a licensed technician.

INLET WATER FILTER CLEANING

1. Close the manual gas shutoff valve.

2. Turn off power to the unit and wait a couple of seconds. Turn on

again.

3. Wait 30 seconds, and then turn off power to the unit.

4. Close the inlet water valve.

5. Open all hot water taps in the house. When the residual water flow

has ceased, close all hot water taps.

6. Have a bucket or pan to catch the water from the unit’s drain plug.

If Isolation valves are installed, open the drains to drain the water.

If isolation valves are not installed, unscrew the drain plug and the

pressure relief valve to drain the water out of the unit. Do not lose

If this filter is clogged, water will not be supplied to the water heater properly.

the o-ring that will be on the drain plug.

7. Wait a few minutes to ensure all water has completely drained from the unit.

8. Clean the filter: Check the water filter located within the cold inlet. With a tiny brush,

clean the water filter of any debris which may have accumulated and reinsert the

filter back into the cold water inlet.

9. Securely screw the drain plug back into place. Hand- tighten only.

Gas

inlet

Cold

inlet

Drain plug

with ﬁlter

Hot

outlet

Pressure

relief valve

36 Page

MEASURING INLET GAS PRESSURE

The water heater cannot perform properly without sufficient inlet gas pressure. Below are instructions

on how to check the inlet gas pressure. THIS IS ONLY TO BE DONE BY A LICENSED PROFESSIONAL.

1. Shut off the manual gas valve on the gas supply line.

2. Remove the screw from the pressure port which is located on the gas inlet

of the water heater shown in the diagram on the right.

3. Connect the manometer to the pressure port and zero the manometer.

4. Re-open the manual gas valve. Verify that there are no gas leaks.

5. With all gas burning equipment off, take a reading of the static gas pressure

and make a note of it.

6. Measure gas supply pressure at maximum heater operation:

• Remove the front cover and locate the Max/Min button on the com-

puter board.

• Open hot water faucets to create maximum flow.

• Press the MAX button on the computer board. (Refer to the diagrams

below.)

• Take a reading of the supply dynamic gas pressure with all gas burning equipment running at

maximum rate.

7. The static and dynamic pressures should be within the ranges specified on the heater's rating plate

and the table on page 18.

8. The difference of static to dynamic pressure should not exceed 1.5" W.C. Pressure drops that exceed

1.5" W.C. can indicate restricted gas flow, undersized gas lines, and/or undersized supply regulators.

9. Measure gas supply pressure at minimum heater operation:

• Reduce water flow so the heater is running at minimal operation.

• Press the MIN button on the computer board. (Refer to the diagrams below.)

• Take a supply gas pressure reading and verify that it is within the specified inlet gas pressure

range. (Refer to the heater's rating plate and the table on page 18.)

10. After measuring inlet gas pressure, shut off the manual gas valve on the gas supply line and turn

off the power supply.

11. Remove the manometer and replace the port screw securely. If the screw isn’t fastened securely at

this time, it may cause a gas leak. Verify that there are no gas leaks.

12. Replace the front cover.

1. Turn off all electric power to the water heater if service is to be performed.

2. Turn the manual gas valve located on the outside of the unit to the off position.

3. Failure to follow these steps could lead to fire or explosion, resulting in personal injury

or death.

WARNING

310CX3 Computer board

MAX button

MIN button

510CX3 Computer board

MAX button

MIN button

Maintenance & Service

Owner's Guide

Pressure

port

37 Page

1. Close the manual gas shutoff valve.

2. Turn off power to the unit and wait five (5) seconds.

Turn on again.

3. Wait 30 seconds, and then turn off power to the unit.

4. Close the inlet water valve.

5. Open all hot water taps in the house. When the

residual water flow has ceased, close all hot water

taps.

6. Have a bucket or pan to catch the water from the

unit’s drain plugs. If Isolation valves are installed,

open the drains to drain the water. If isolation valves

are not installed, unscrew the drain plug and the

pressure relief valve to drain the water out of the

unit. Do not lose the o-ring that will be on the drain

plug.

7. Drain the X3

™

Cartridge: Have a bucket or pan to catch water from the X3™ Cartridge. To remove

the X3

™

Cartridge, turn it left until the symbol aligns with the symbol. Pull down to

remove it from the water heater.

8. Drain the water in the X3

™

Cartridge completely.

9. Wait a few minutes to ensure all water has completely drained from the unit.

10. Keep the cold/hot water valves closed. Keep the gas valve closed. Keep supply power

disconnected.

11. Securely screw the drain plugs back into place. Hand- tighten only.

Removal of the X3

™

Cartridge:

UNIT DRAINING & POWER OUTAGE (FREEZE PROTECTION)

If you will not be using your heater for a long period of time, drain the water out of the unit completely

and disconnect power to your heater to keep the water heater from freezing and being damaged.

Gas

inlet

Cold

inlet

Drain plug

with ﬁlter

Hot

outlet

Pressure

relief valve

Maintenance & Service

Owner's Guide

38 Page

TROUBLESHOOTING

GENERAL

PROBLEM SOLUTIONS

TEMPERATURE and AMOUNT OF HOT WATER

It takes a long time to

get hot water at the

fixtures.

• The time it takes to deliver hot water from the water heater to your

fixtures depends on the length of piping between the two. The longer the

distance or the bigger the pipes, the longer it will take to get hot water.

The water is not hot

enough.

• Compare the flow and temperature. See the charts on p. 48.

• Check cross plumbing between cold water lines and hot water lines.

• Is the gas supply valve open fully? (p. 26)

• Is the gas line sized properly? (p. 18)

• Is the gas supply pressure within specified limits? (pp. 18 and 36)

• Is the set temperature set too low? (pp. 31 and 33)

• Check if the POU mixing valves are set correctly if they are installed.

Check valve manufacturer's instructions for proper adjustment.

The water is too hot. • Is the set temperature set too high? (pp. 31 and 33)

The hot water is not

available when a

fixture is opened.

• Make sure the unit has 120 VAC, 60 Hz power supply.

• Is the power button turned on?

• Is the gas supply valve open fully? (p. 26)

• Is the water supply valve open fully? (p. 26)

• Is the filter on the cold water inlet clean? (p. 35)

• Is the hot water fixture sufficiently open to draw at least 0.5 GPM

(1.9 L/min) through the water heater? (p. 30)

• Is the unit frozen? (p. 34)

The hot water turns

cold and stays cold.

• Is the flow rate enough to keep the water heater running? (p. 30)

• Is the gas supply valve open fully? (p. 26)

• Is the filter on the cold water inlet clean? (p. 35)

• Are the fixtures clean of debris and obstructions?

Fluctuation in hot

water temperature.

• Is the filter on the cold water inlet clean? (p. 35)

• Is the gas line sized properly? (p. 18)

• Is the supply gas pressure within specified limits? (pp. 18 and 36)

• Check for cross connection between cold water lines and hot water lines.

WATER HEATER

Unit does not ignite

when water goes

through the unit.

• Is the flow rate over 0.5 GPM (1.9 L/min)? (p. 30)

• Check the filter on cold water inlet. (p. 35)

• Check for reverse connection and cross connection.

• If you use the remote controller, is the power button turned on?

• Check if the inlet water temperature is too high. If it is too close to the

set temperature, the water heater will not activate.

The fan motor is

still spinning after

operation has

stopped.

• This is normal. After operation has stopped, the fan motor keeps running

from 10 to 70 seconds in order to re-ignite quickly, as well as purge all the

exhaust gas out of the flue.

Unit sounds abnor-

mal while in opera-

tion

• Contact the manufacturer at 1-877-737-2840 (USA).

Troubleshoong

Owner's Guide

39 Page

PROBLEM SOLUTIONS

BUILT-IN CONTROLLER

and REMOTE CONTROLLER

Built-in and remote

controller do not

display anything when

the power button is

turned on.

• Make sure the unit is supplied with power.

• For the remote controller: Make sure the connection to the unit is

correct. (pp. 23 and 24)

When the

controller is turned

ON, STAND BY LED

is lit.

Built-in controller

• When the unit has not operated for five minutes or more, the

display turns off to conserve energy.

An ERROR code is

displayed.

• Please see pp. 39 to 41.

Troubleshoong

Owner's Guide

ERROR CODES

-General-

• The units have self-diagnostic functions for safety and convenience when troubleshooting.

• If there is a problem with the installation or the unit, the error code will be displayed on the

temperature controller and remote controller.

• Consult the table on the following pages for the description of each error code.

Green LED

310CX3

Error code on the computer board

510CX3

Green LED

Error code indicator on

the built-in controller

Error code indicator on

the remote controller

Indicated by 1/2-second flashes on the Green LED.

Example: If your unit has the "321" error code (which signifies an inlet thermistor failure)

• Indicator on the built-in controller and/or remote controller:

"321" will be displayed on the screen.

• Green LED on the computer board: The green LED on the computer board will indicate this code with

two flashes every 1/2 second. The pattern will repeat with a three second delay between patterns.

Error code

40 Page

-Fault Analysis of Error Codes-

If the error code is displayed on the computer board of the water heater or remote controller, please

check the following. After checking, consult with the manufacturer.

Troubleshoong

Owner's Guide

Remote

Green

LED

Malfunction

description

Diagnosis

031

One Flash

Incorrect DIP switch

setting

• Check the DIP switch settings on the PCB (Part #701).

101

Five Flashes

Warning for the “991”

error code

• Check the gas type of the water heater.

• Check if there is any blockage in the intake air and/or

exhaust.

• Check to make sure that there is enough distance between

the concentric vent terminal and other exhaust vent

terminals.

• Check the altitude/elevation of the area where the water

heater is installed.

• Check if there is grease and/or dirt in the burner (Part #101)

and the fan motor (Part #103), especially if the water heater

has been installed in a contaminated area.

• Inspect the environment around the water heater.

Determine how long the unit has been installed.

111*

Three Flashes

Ignition failure • Check if the Hi-limit switch (Part #412) is properly

functioning.

• Check for connection/breakage of wires (Part #413, 708,

709), burn marks on the computer board (Part #701), and/or

soot on the flame rod (Part #108).

• Check if there is a buzzing spark ignition sound coming

from the burner (Part #101) when the water heater

prepares for combustion.

• Listen for the double “clunk” sound coming from the gas

valve assembly (Part #102) when the water heater goes

into combustion.

• Check if there is leaking from heat exchanger (Part #401).

121*

Three Flashes

Loss of flame • Check if the Hi-limit switch (Part #412) is functioning

properly.

• Check for connection/breakage of wires (Part #413, 708,

709), burn marks on the computer board (Part #701),

and/or soot on the flame rod (Part #108).

• Check if there is leaking from heat exchanger (Part #401).

311*

Two Flashes

310CX3:

Outlet thermistor

failure

510CX3:

Heat exchanger

thermistor failure

• Check for connection/breakage of wires and/or debris on

thermistor (Part #407, 408, 411, 713).

321*

Two Flashes

Inlet thermistor failure

331*

Two Flashes

Outlet thermistor

failure

(510CX3 only)

391

Two Flashes

Air-fuel ratio rod failure • Check for connection/breakage of wires (Part #709) and/

or soot on the AFR rod (Part #108).

41 Page

Troubleshoong

Owner's Guide

Remote Green LED

Malfunction

description

Diagnosis

510

Six Flashes

Abnormal main gas

solenoid valve

• Check for connection/breakage of wires (Part #708) and/

or burn marks on the computer board (Part #701).

551

Six Flashes

Abnormal gas

solenoid valve

• Check for connection/breakage of wires (Part #708) and/

or burn marks on the computer board (Part #701).

611*

Four Flashes

Fan motor fault • Check for connection/breakage of wires, dust buildup

in the fan motor (Part #103) and/or burn marks on the

computer board (Part #701).

• Check for frozen/corrosion of connectors (Part #103).

661*

Four Flashes

Bypass valve fault

(510CX3 only)

• Inspect the bypass valve (Part #403), for connection/

breakage of wires, locked motor drive due to scale

buildup, and/or water leakage.

701*

One Flash

Computer board fault

• Check for connection/breakage of wires (Part #714).

711*

One Flash

Gas solenoid valve

drive circuit failure

• Refer to the 111 and 121 error codes.

721*

Six Flashes

False flame detection • Check if condensate drain is installed on the vent collar of

the water heater.

• Check if there is leaking from heat exchanger (Part #401).

741

N/A

Miscommunication

between water heater

and remote controller

• Check the model type of the remote controller.

• Inspect the connections between the water heater and

remote controller.

• Check the power supply of the water heater.

751

N/A

Miscommunication

between water heater

and built-in controller

• Inspect the connections between the water heater and

built-in controller.

• Check the power supply of the water heater.

991

Five Flashes

Imperfect

combustion

• Check the gas type of the water heater.

• Check if there is any blockage in the intake air and/or

exhaust.

• Check to make sure that there is enough distance between

the concentric vent terminal and other exhaust vent

terminals.

• Check the altitude/elevation of the area where the water

heater is installed.

• Check if there is grease and/or dirt in the burner (Part #101)

and the fan motor (Part #103), especially if the water heater

has been installed in a contaminated area.

• Inspect the environment around the water heater.

Determine how long the unit has been installed.

*These error codes will be cleared when water flow stops.

42 Page

COMPONENTS DIAGRAM

Components Diagram

Owner's Guide

Built-in temperature controller

722

721

056

Surge box assembly

121

705

053

706

703

704

705

001

002

003

006

463

004

007

005

704

710

053

052

051

053

Case assembly

43 Page

Computer board assembly

Components Diagram

Owner's Guide

310CX3

705

103

709

402

711

714

407

408

708

701

061

712

721

707

723

987654321 10

OFF

Bank of DIP switches

Decrease bu�on

Increase bu�on

MIN bu�on

MAX bu�on

Flow

Sensor

PCB

120 VAC

Ground

Igniter rod

SV3

SV2

SV1

O.H.C.F.

Gas

Propor-

�onal

Valve

Outlet

thermistor

Inlet

thermistor

Surge

box

Green LED

Hi-

limit

Switch

Flow

Adjust-

ment

Valve

103

709

402

408

407

721

707

402

714

708

711

705

704

705

Thermostat

Remote controller

Heater

Thermostat

Ground

Flame rod

AFR rod

Built-in controller

87654321

654321

Bank of

Gas

Propor-

�onal

Valve

Bypass

Valve

MAX bu�on

MIN bu�on

Increase bu�on

Decrease bu�on

Igniter rod

PCB

Ground

O.H.C.F

SV1

SV2

SV3

Flow

Sensor

120 VAC

Ground

Surge

box

Hi-

switch

limit

Green LED

Thermostat

Inlet thermistor

Outlet thermistor

exchanger thermistor Heat

DIP switches

Remote controller

Built-in controller

Thermostat

Heater

Flow

Adjust-

ment

Valve

Flame rod

AFR rod

Ground

103

709

402

721

707

402

403

708

714

713

711

705

704

705

510CX3

701

705

103

402

707

713

723

403

714

709

708

711

721

712

44 Page

Components Diagram

Owner's Guide

Burner assembly

510CX3 model

LP Conversion Kit

130

131

Gas conversion

sticker

101

119

120

107

109

108

709

111

711

112

110

053

711

113

114

102

118

117

708

151

052

714

057

707

702

055

150

055

066

401

004

105

104

103

123

115

116

053

122

054

063

064

065

053

140

062

063

45 Page

Components Diagram

Owner's Guide

Water Way assembly

From Water

inlet sec�on

To Water

outlet sec�on

416

414

419

451

462

458

420

464

453

451

458

411

462

450

459

414

465

461

068

725

454

414

412

058

060

053

401

413

452

458

462

460

456

403

456

418

458

462

417

460

462

060

402

310CX3 Pipe section

From Water ﬂow sensor

& adjustment valve

To Water

outlet sec�on

451

460

456

414

419

462

416

451

417

414

417

456

460

456

458

460

Bypass secon

510CX3

Water outlet section

409

052

454

408

059

415

Water inlet section

052

059

462

461

404

458

421

415

407

454

457

458

422

423

462

458

451

405

406

46 Page

Parts List

Owner's Guide

PARTS LIST

Item # Description Part #

001 Case assembly

N/A

002 Front cover N/A

003

004

005

006

007

Upper bracket

Duct unit

Duct unit cover

Lower bracket

Duct unit fixing

N/A

051

052

053

Truss Screw M4×12 (W/Washer) SUS410

Truss Screw M4×10 (Coated) SUS3

Truss Screw M4x10 SUS

100074210

100074211

100074245

054

055

056

057

Hex head screw M4×12 (W/Washer) SUS3

Hex head screw M4x8 FEZN

Pan Screw M4x20 SUS410

Tap tight screw M4x12 FEZN

N/A

058

059

060

061

062

063

064

065

066

068

Tapping Screw M3x6 SUS3 Pan head

Tapping Screw M4x6 SUS3 Truss head

Truss Screw M4x8 SUS3

Screw M3x6 BSNI Binding head

Screw M3x12 BSNI Raised counter sunk head

Tapping Screw M4x14 SUS410 Truss head

Pan Screw M3x10 SEMS MFZN

Pan Screw M4x8 MFZN

Pan Screw M4x10 FEZN

Truss screw M4x12 (Coated) SUS 3

N/A

100074512

N/A

100076450

N/A

100074247

N/A

101

102

Burner and mixing chamber assembly

Manifold with gas valve assembly NA

100356389

100356403

103

104

105

Fan motor assembly

Fan motor gasket

Fan motor plate

100224094

100224095

100224096

107 Rod holder gasket 100356373

108

109

110

111

Flame rod with AFR function

Igniter rod

Rod holder

Rod cap

100224098

100224099

100356374

100076319

112

113

114

Burner damper

Manifold gasket A

Manifold gasket B

100224101

100224102

100224103

115

116

117

118

119

120

Pressure port

Combustion chamber tube

Gas inlet

Gas inlet ring

Burner gasket

Burner holder gasket

100074227

N/A

100356404

100074234

100224105

100224106

121

122

123

Surge box plate

Fan motor plate

Fan motor damper

N/A

100356375

130

131

LP Conversion Kit

Manifold Gasket

100357126

100281157

140 HX front fixing plate N/A

150

151

O-ring (Manifold)

O-ring P20 NBR (Black)

N/A

100074242

401 Heat exchanger assembly for 310CX3

for 510CX3

100356390

100356391

402

403

404

Flow adjustment valve / Flow sensor

Bypass valve for 510CX3

Water inlet

100356402

100320466

100320526

405

406

407

Inlet drain plug

Inlet water filter

Inlet thermistor for 310CX3

Inlet thermistor for 510CX3

100320506

100356400

100356405

47 Page

Item # Description Part #

408 Outlet thermistor for 310CX3

Outlet thermistor for 510CX3

100356401

100356406

409

411

Water outlet

Heat exchanger thermistor for 510CX3

100320527

100320522

412 Hi-Limit switch for 310CX3

Hi-Limit switch for 510CX3

100074412

100074280

413

414

415

Overheat-cut-off fuse

Pipe heater

Inlet heater

100074252

100074682

100074629

416

417

418

Pipe inlet for 310CX3

Pipe inlet for 510CX3

Joint for 310CX3

Joint for 510CX3

Thermo switch

100356392

100356393

100356394

100356395

N/A

419

420

Pipe outlet for 310CX3

Pipe outlet for 510CX3

Flow sensor cover

100356396

100356397

N/A

421

422

423

X3™ Inlet joint

X3™ Inlet pipe

Inlet pipe heater

100356398

100356399

100348805

450

451

452

453

Pipe heater fixing plate

Heater fixing plate 16

Fuse fixing plate 18

Combustion chamber fixing plate

N/A

100074310

N/A

454

456

457

O-ring P4 FKM

O-ring P14 FKM

O-ring P15 FKM

100076303

100076306

100076307

458

459

460

461

O-ring P16 FKM

Fastener “4-11” for 510CX3

Fastener “14-22”

Fastener “16A”

100076308

100074282

100074290

100074410

462

463

464

465

Fastener “16-25A”

Silicon ring

HX fixing plate

X3™ manifold assembly

100074389

N/A

100314460

701 Computer board for 310CX3

for 510CX3

100356386

100356387

702

703

704

Remote fixing plate for 510CX3

Surge box

120 VAC wire

100074644

100076100

100074601

705

706

Switch wire

120 VAC Power ON-OFF switch

100356388

N/A

707

708

Remote controller wire for 310CX3

for 510CX3

Gas valve wire

100074649

100074650

N/A

709

710

711

Flame rod wire

Cable strap

Igniter assembly

N/A

100074640

712

713

714

Computer board cover

24V cables for 510CX3

Proportional gas valve wire

N/A

100074642

721

722

723

725

Temperature controller

Controller fixing plate

PCB fixing plate

X3™ cartridge

100074660

N/A

100314491

Parts List

Owner's Guide

48 Page

OUTPUT TEMPERATURE CHART

These charts are based on properly sized gas lines and installation at 0-2,000 ft. The water heater will

de-rate approximately 4% per 1,000 ft of elevation increase above 2000 ft.

To reduce the risk of scalding, install Thermostatic Mixing Valves (temperature limiting valves) at each

point of use.

Output Temperature Chart

Owner's Guide

310CX3

510CX3

100

(38)

105

(40)

110

(43)

115

(45)

120

(50)

125

(52)

130

(55)

135

(57)

140

(60)

145

(63)

150

(65)

155

(68)

160

(70)

40°F (4°C)

50°F(10°C)

60°F(16°C)

70°F(21°C)

0.0

2.0

4.0

6.0

8.0

10.0

12.0

40°F (4°C)

50°F(10°C)

60°F(16°C)

70°F(21°C)

5.3

(20.1)

6.4

(24.2)

8.0

(30.1)

10.0

(37.9)

4.9

(18.6)

5.8

(22.0)

7.1

(26.9)

9.1

(34.5)

4.5

(17.0)

5.3

(20.1)

6.4

(24.2)

8.0

(30.1)

4.2

(15.9)

4.9

(18.6)

5.8

(22.0)

7.1

(26.9)

4.0

(15.1)

4.5

(17.0)

5.3

(20.1)

6.4

(24.2)

3.7

(14.0)

4.2

(15.9)

4.9

(18.6)

5.8

(22.0)

3.5

(13.3)

4.0

(15.1)

4.5

(17.0)

5.3

(20.1)

3.4

(12.9)

3.7

(14.0)

4.2

(15.9)

4.9

(18.6)

3.2

(12.1)

3.5

(13.3)

4.0

(15.1)

4.5

(17.0)

3.0

(11.4)

3.4

(12.9)

3.7

(14.0)

4.2

(15.9)

2.9

(11.0)

3.2

(12.1)

3.5

(13.3)

4.0

(15.1)

2.8

(10.6)

3.0

(11.4)

3.4

(12.9)

3.7

(14.0)

2.7

(10.2)

2.9

(11.0)

3.2

(12.1)

3.5

(13.3)

( L /M)

100

(38)

105

(40)

110

(43)

115

(45)

120

(50)

125

(52)

130

(55)

135

(57)

140

(60)

40°F(4°C)

50°F(10°C)

60°F(16°C)

70°F(21°C)

0.0

2.0

4.0

6.0

8.0

10.0

40°F(4°C)

50°F(10°C)

60°F(16°C)

70°F(21°C)

5.2

(19.7)

6.2

(23.5)

7.8

(29.5)

8.0

(30.3)

4.8

(18.2)

5.7

(21.6)

6.9

(26.1)

8.0

(30.3)

4.4

(16.7)

5.2

(19.7)

6.2

(23.5)

7.8

(29.5)

4.1

(15.5)

4.8

(18.2)

5.7

(21.6)

6.9

(26.1)

3.9

(14.8)

4.4

(16.7)

5.2

(19.7)

6.2

(23.5)

3.7

(14.0)

4.1

(15.5)

4.8

(18.2)

5.7

(21.6)

3.5

(13.3)

3.9

(14.8)

4.4

(16.7)

5.2

(19.7)

3.3

(12.5)

3.7

(14.0)

4.1

(15.5)

4.8

(18.2)

3.1

(11.7)

3.5

(13.3)

3.9

(14.8)

4.4

(16.7)

100

(38)

105

(40)

110

(43)

115

(45)

120

(50)

125

(52)

130

(55)

135

(57)

140

(60)

40°F(4°C)

50°F(10°C)

60°F(16°C)

70°F(21°C)

0.0

2.0

4.0

6.0

8.0

40°F(4°C)

50°F(10°C)

60°F(16°C)

70°F(21°C)

3.7

(14.0)

4.4

(16.7)

5.5

(20.8)

6.6

(25.0)

3.4

(12.9)

4.0

(15.1)

4.9

(18.6)

6.3

(23.9)

3.1

(11.7)

3.7

(14.0)

4.4

(16.7)

5.5

(20.8)

2.9

(11.0)

3.4

(12.9)

4.0

(15.1)

4.9

(18.6)

2.8

(10.6)

3.1

(11.7)

3.7

(14.0)

4.4

(16.7)

2.6

(9.8)

2.9

(11.0)

3.4

(12.9)

4.0

(15.1)

2.4

(9.8)

2.8

(10.6)

3.1

(11.7)

3.7

(14.0)

2.3

(8.7)

2.6

(9.8)

2.9

(11.0)

3.4

(12.9)

2.2

(8.3)

2.4

(9.8)

2.8

(10.6)

3.1

(11.7)

Output Hot Water GPM

Set Temp.

°F(°C)

Incoming Temp.

Output Hot Water GPM

Set Temp.

°F(°C)

Incoming Temp.

Output Hot Water GPM

Set Temp.

°F(°C)

Incoming Temp.

Output Temperature vs. GPM (Max. 8.0 GPM) with Various Inlet Water Temperature

Output Temperature vs. GPM (Max. 10.0 GPM) with Various Inlet Water Temperature

4GV007

DIR 2000610429

(REV. B)

Reliance TS-310CX3 110 Non-Condensing Concentric Vent Indoor 190,000 BTU Natural Gas/Liquid Propane Tankless Water Heater with X3® Scale Prevention Technology

Product's Documents

Manual - Reliance Non-Condensing Tankless Manual

Specifications

Reliance TS-310CX3 110 Questions and Answers

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