Takagi T-H3J-DV Service Handbook
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Takagi T-H3J-DV Service Handbook

Condensing models
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See also: Installation Instructions & Owner's Manual
Condensing Models
On-Demand Water Heater
THIS SERVICE HANDBOOK IS FOR USE BY QUALIFIED SERVICE PROFESSIONALS ONLY.
IF YOU NEED ASSISTANCE, CALL TECHNICAL SUPPORT.
IN USA, CALL AT 877-737-2840. IN CANADA, CALL 888-479-8324.
Service Handbook
MODELS:
240 Indoor (T-H3J-DV)
340 Indoor (T-H3S-DV)
540 Indoor (T-H3-DV)
Series 100/101
240 Outdoor (T-H3J-OS)
340 Outdoor (T-H3S-OS)
540 Outdoor (T-H3-OS)
DIR 2000534342 Rev. A
October 2016

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  • Page 1 Condensing Models On-Demand Water Heater Service Handbook MODELS: 240 Indoor (T-H3J-DV) 240 Outdoor (T-H3J-OS) 340 Indoor (T-H3S-DV) 340 Outdoor (T-H3S-OS) 540 Indoor (T-H3-DV) 540 Outdoor (T-H3-OS) Series 100/101 THIS SERVICE HANDBOOK IS FOR USE BY QUALIFIED SERVICE PROFESSIONALS ONLY. IF YOU NEED ASSISTANCE, CALL TECHNICAL SUPPORT.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS SPECIFICATIONS ......................................4 INTRODUCTION ......................................5 General Installation Guidelines ........................................5 NORMAL OPERATION ....................................6 Activation ........................................6 Operation ........................................6 Shutdown ........................................6 TROUBLESHOOTING .....................................7 Preliminary Checklist ....................................7 Gas/Water/Electric: .................................. 7 Remote Controller: ................................... 7 High Altitude: .................................... 7 Long Vent Run ....................................
  • Page 3 SERVICE PROCEDURES ....................................32 Unit Draining and Filter Cleaning ................................32 Checking for a Crossed Connection ................................. 33 Checking for a Reversed Connection ............................... 33 Checking the Inlet Gas Pressure and Pressure Drop ..........................33 Checking and Adjusting the Manifold Gas Pressure ..........................34 Checking the Manifold Gas Pressure ............................

  • Page 4: Specifications

    SPECIFICATIONS Table 1: Outdoor Outdoor Model Indoor Indoor Outdoor Indoor (T-H3J-OS) (T-H3-OS) (T-H3J-DV) (T-H3S-DV) (T-H3S-OS) (T-H3-DV) Min.: 15,000 Min.: 15,000 Min.: 15,000 Natural Gas Input BTU/h (Operating Range) Max.: 160,000 Max.: 180,000 Max.: 199,000 Min.: 13,000 Min.: 13,000 Min.: 13,000...

  • Page 5: Introduction

    INTRODUCTION • Read and follow all safety messages “Component Diagrams/Item CAUTION and instructions in this handbook and Numbers” (starting on page 71). Wear eye protection during water on the product labeling. • The following graphics, which heater assembly or disassembly. show the location of basic Failure to do so could lead to components.

  • Page 6: Normal Operation

    NORMAL OPERATION If any problem occurs, turn off all hot Operation Shutdown water taps and turn off the gas. Then call a trained technician or the gas company. 1. The heater will stop heating when 10. The proportional gas valve and Becoming familiar with how a tankless the water flow rate drops below fan will modulate based on the...

  • Page 7: Troubleshooting

    NORMAL OPERATION / TROUBLESHOOTING Remote Controller: New Installations: Preliminary If you are using a remote controller, If a newly installed water heater won’t Checklist the remote’s power button must be operate at all or operates erratically, turned on. Press the power button on check for the following: the remote until the amber Stand-By ◦...

  • Page 8: Next Step

    Figure 2. Water is not hot enough. the pump discharge and the connection to the cold water • What is the set temperature of supply. Inspect the check valve On-Demand the heater? Temperature can be Water for proper operation. If there Heater adjusted using the temperature or isn’t one installed, or if it is...

  • Page 9: Temperature Fluctuates When A Fixture Is Opened

    ◦ reading correctly. Refer to error drop is more than 1 inch W.C., Check the sizing of the codes 311 and 321 in Table 2: there may be insufficient gas pump. A minimum flow Error and Flash Codes, page 11. supply.

  • Page 10: Unit Does Not Ignite When Water Goes Through It

    • • Unit does not ignite when Are the hot and cold water Check the rating plate to ensure connections to the water heater that the correct gas type is water goes through it. reversed (hooked up backwards)? applied to the unit. •...

  • Page 11: Error Codes

    Error Codes All units have self-diagnostics. If there is a problem with the unit, a numerical error code will display on the temperature controller of indoor models or on the TM-RE42 Remote Controller (if installed). Installation related problems may also produce an error code. If the remote/temperature controllers are not working, the green LED on the computer board will flash a code pattern.
  • Page 12 ERROR CODE GREEN LED ON SYMPTOM OR ISSUE TROUBLESHOOTING PROCEDURE (PAGE NUMBER) COMPUTER BOARD Two Flashes Inlet thermistor failure Code 311, 321, 331 or 341: Thermistor Failure, p. 16. Outlet thermistor failure Two Flashes Code 311, 321, 331 or 341: Thermistor Failure, p. 16. (540 model only) Exhaust thermistor failure...
  • Page 13 ERROR CODE GREEN LED ON SYMPTOM OR ISSUE TROUBLESHOOTING PROCEDURE (PAGE NUMBER) COMPUTER BOARD Five Flashes Abnormal exhaust Code 941: Abnormal Exhaust Temperature, p. 21. temperature (Indoor model only) Five Flashes Imperfect Code 991: Abnormal Combustion, p. 21. Combustion On-Demand Water Heater Service Handbook for 240, 340 & 540 Condensing Models •...

  • Page 14: Code 031: Incorrect Dip Switch Settings

    Code 031: Incorrect DIP Switch during a heating cycle and was not Turn off power to the heater able to establish a flame after three by disconnecting the power Settings failed ignition attempts (code 121). cord or external switch. The system displays this code when These codes can appear due to a an incorrect DIP switch setting is Locate the high limit switch...
  • Page 15 2.3.1 Push the button in the the burner chamber and force the If the previous steps still middle of it. The switch was diaphragm in the proportional valve don’t result in a spark being reset if you heard and felt to close.

  • Page 16: Code 311, 321, 331 Or 341: Thermistor Failure

    Code 311, 321, 331 or 341: Error Indoor Model Locate the 3. After you have located the correct Thermistor Failure Code Type thermistor thermistor, verify that the wire Outdoor by its The system displays this code when it connections are secure and free of Model? callout: detects a thermistor failure.

  • Page 17: Code 391: Air-Fuel Ratio Rod Failure

    allow you to access the A floating ground can cause this not indicated, proceed to the next outlet thermistor. error. step. Remove the screw or clip 2. Check that the wire connections 5. Check the inline water filter for that secures the thermistor, are secure and free of burns or debris.

  • Page 18: Code 551: Abnormal Solenoid Gas Valve (Sv1, Sv2, And/Or Sv3)

    • • replace the gas valve. SV3: Red (#73) & Blue Red & Blue Normal: 132 to 192 VDC In each case, the voltage reading 6. Check the voltage across the main (during operation) should be 93-120 VDC. If the gas valve wires (blue - light blue •...

  • Page 19: Code 661: Bypass Valve Fault (540 (T-H3) Model Only)

    the black and red wires. (See page Code 701: Computer Board Turn off the power supply. 30 or 31.) Normal voltage range Fault / Proportional Gas Valve Check the wire connections (black-red): Fault at both the gas valve and 7 VDC - 16 VDC. If the voltage is out on the control board.

  • Page 20: Code 721: False Flame Detection

    page 35. Outdoor models manufactured frequent power surges occur, install prior to April 2015 were adequate surge protection to prevent 5. There may be a computer board equipped with remote controller nuisance faults. (PCB) and/or gas valve fault. Refer TM-RE40/100112572; current to error codes 510 and 551.

  • Page 21: Code 941: Abnormal Exhaust Temperature

    • Multi-Link System: and reference the component schematic ft. above sea level. A DIP Push the Alarm Reset button on on the last few pages of the manual. switch change is required for the multi-unit controller to clear installations that are higher Safety first! These procedures must be the code.
  • Page 22 for the correct volume of gas. and obstructions in the Refer to the installation manual or venting or heater will affect the current edition of the National manifold pressure readings. Fuel Gas Code, ANSI Z223.1/ 8. Contact Technical Support NFPA 54 (U.S.) or Natural Gas and regarding the manifold pressure.

  • Page 23: Dip Switch Settings

    DIP SWITCH SETTINGS Figure 9 : 240 (T-H3J) and 340 (T-H3S) The computer board layout for all 240 and 340 models is identical. See “Wiring Diagrams,” page 30. The DIP switches have certain special functions as shown on the following table and generally should not need adjustment. Verify the functions of each DIP switch carefully before changing any settings.
  • Page 24 DIP SWITCH SETTINGS (CONTINUED) The 540 Indoor (T-H3-DV) model uses the same computer board Figure 10 : 540 (T-H3) Model as the 540 Outdoor (T-H3-OS) model. There are two banks of DIP switches (upper and lower bank) on the computer board. The upper Upper bank of bank has certain special functions as shown on the following table DIP switches...
  • Page 25 DIP SWITCH SETTINGS (CONTINUED) Table 7: 540 (T-H3) model Lower bank of DIP switches (Figure 11) NOTE: Dark squares represents DIP switches Functions ON position OFF position Parent/Child setting for Easy-Link Systems Parent Child (Default) FM+, FM- and Input- (Fan motor speed is increased automatically.) DEFAULT For correct settings, see pages 28 and 29.

  • Page 26: High Altitude Settings

    HIGH ALTITUDE SETTINGS By default, all models are set to operate at altitudes of up to Figure 12 : 240 (T-H3J) and 340 (T-H3S) 2,000 feet. However, the altitude settings can be adjusted as described in the following pages. WARNING Failure to properly set the DIP switches could cause carbon monoxide poisoning, resulting in severe personal injury or death.
  • Page 27 HIGH ALTITUDE SETTINGS (CONTINUED) Figure 13 : 240 (T-H3J) and 340 (T-H3S) WARNING Failure to properly set the DIP switches could cause carbon monoxide poisoning, resulting in severe personal injury or death. Table 10: Outdoor model, 240 (T-H3J) / 340 (T-H3S) - Propane Apply the altitude setting by adjusting DIP switches 3, 4, Bank of DIP Switches and 5 as described below.
  • Page 28 HIGH ALTITUDE SETTINGS (CONTINUED) Figure 14 : 540 (T-H3) WARNING Failure to properly set the DIP switches could cause carbon monoxide poisoning, resulting in severe personal injury or death. Table 12: Indoor model, 540 (T-H3) - Propane Apply the altitude setting by adjusting DIP switches 2, 3, and 4 on Lower bank of the lower bank.
  • Page 29 HIGH ALTITUDE SETTINGS (CONTINUED) WARNING Failure to properly set the DIP switches could cause carbon monoxide poisoning, resulting in severe personal injury or death. Table 14: Outdoor model, 540 (T-H3) - Propane Apply the altitude setting by adjusting DIP switches 2, 3, and 4 on the lower bank. See Figure 14, page 28.

  • Page 30: Wiring Diagrams

    WIRING DIAGRAMS Figure 15: Wiring Schematic for 240 (T-H3J) and 340 (T-H3S) Models W: WHITE BK: BLACK LB: LIGHT BLUE R: RED BL: BLUE Y: YELLOW G: GREEN BR: BROWN P: PURPLE O: ORANGE 240/340 Outdoor 240/340 Indoor Heater Heater Heater Heater Heater...
  • Page 31 WIRING DIAGRAMS (CONTINUED) Figure 16: Wiring Schematic for 540 (T-H3) Models W: WHITE BK: BLACK LB: LIGHT BLUE R: RED BL: BLUE Y: YELLOW BR: BROWN G: GREEN O: ORANGE P: PURPLE 540 Outdoor 540 Indoor Heater Heater Heater Heater Heater Heater Heater...

  • Page 32: Service Procedures

    SERVICE PROCEDURES 6. IF the installation includes isolation counter-clockwise for two turns. (The Unit Draining and valves, follow these sub-steps: drain port is shown at the far left-hand Filter Cleaning side of Figure 17.) There is no need to remove the drain port plug. Place a bucket or pan underneath each isolation valve 9.

  • Page 33: Checking For A Crossed Connection

    the pressure-relief valve, the Figure 20 or Figure 21.) Checking for system has a reversed connection. 9. Record your gas supply pressure a Crossed (dynamic). Connection Checking the Inlet 10. Release the “MAX” button and Gas Pressure and close all of the water fixtures. Pressure Drop 1.

  • Page 34: Checking And Adjusting The Manifold Gas Pressure

    12. The gas supply pressures should be gas manifold pressure.) Checking and within the following ranges: 2. Ensure that the unit is not in operation. Adjusting the • Natural Gas: 4 to 10.5 inches W.C. Manifold Gas 3. Remove the screw from the •...

  • Page 35: Adjusting Maximum Manifold Pressure

    match up with those listed on the set, deactivate the water heater, 4. Run water through the water rating plate, adjust the manifold remove the manometer tube, and heater to activate its operation. If pressure. To do so, refer to the replace the port screw.

  • Page 36: Checking The Flow Sensor

    49 or Figure 42, p. 50. p. 49 or Figure 42, p. 50.) Its flow Blow into the flow sensor. If rate is determined by an impeller that the fan initiates, the flow 3. Find the white clip at the end of spins as water runs through it.
  • Page 37 5. Clean the flame sensor and air/fuel Figure 26. Figure 25. ratio rod as described below. (See Figure 26.) Front of burner: Clean the portion of the flame sensor that extends to Flame Rod /AFR Assembly the inside of the burner. Use 100 grit sandpaper or other suitable abrasive.

  • Page 38: Descaling The Unit

    by turning off the associated vinegar from the water heater. Descaling the Unit circuit breaker (outdoor 18. Close valve D. models). 19. Remove the drain port’s plug 3. Once power to the water heater again (Figure 17, p. 32), making During operation, a tankless water has been disconnected, close the sure that the bucket is placed...

  • Page 39: Cleaning The Combustion Components

    • 1. Prepare the water heater for Igniter rod wire (black). Cleaning the service as follows: See Figure 41, p. 49 Combustion OR Figure 42, p. 50 Disconnect power to the (center of picture). Components water heater by unplugging it from the wall outlet or Remove the screw that turning it off at the circuit secures the computer board...
  • Page 40 Lift the manifold plate/ part number 100074242 NOTICE: Remove only the gas valve assembly upward (item 151) and/or screws along the outside to remove it from the gas 100074526 (item 119). edges of the manifold plate. inlet connection. (The gas 6.
  • Page 41 6.2.4 Once loosened, grasp an Clear excessive water from the Place a towel at the bottom oval air vent in the center burner with compressed air. of the combustion chamber and pull the burner out. so that it covers the fan Inspect the gasket.
  • Page 42 □ Insert an air compressor’s air NOTICE: Ensure that the solenoid hose into the opening from connectors are reinstalled in □ If necessary, refer to the which the burner was removed. the correct locations. exploded assembly views ◦ which start on page 71. Blow air up into the heat To do so, match the printed exchanger to remove...

  • Page 43: Easy-Link Connections With Previous Models (540 [T-H3] Only)

    Easy-Link Connections with Previous Models (540 [T-H3] Only) DIP Switch Setting on the 540 (T-H3) Computer Board The 540 (T-H3) model can be connected to 520 (T-H2) or 710 (T-M32) models using the Easy-Link system. However, you must change one DIP switch setting first. On each 540 (T-H3) computer board, change DIP switch no. 6 on the lower bank of switches to the “ON”...

  • Page 44: Temperature Settings

    Temperature Settings When the 540 (T-H3) is connected with 520 (T-H2) models as part of an Easy-Link System, the available set temperatures will default to what is available on the 520 (T-H2). These temperatures range from 100°F to 175°F or from 100°F to 185°F. See the tables below.

  • Page 45: Diagnostic Mode

    is attached to the multi-unit hold the HOT and COLD buttons Diagnostic Mode controller: simultaneously for at least five seconds. Press the HOT button and the COLD Diagnostic mode allows you to NOTE: You may exit diagnostic mode button simultaneously for at least discover various pieces of information by pressing the ON/OFF button.
  • Page 46 2. “0” will display on the controller. the Easy-Link system. A maximum 6. Press the INFO button to select (Figure 40.) of four 540 (T-H3) units can be the mode number. The data will be linked together in an Easy-Link displayed on the controller.
  • Page 47 Table 18. Mode Number Descriptions Mode # Whole Multi-Unit System information (#0) Unit information (#1 to #4) Total system flow rate 0 to 999 (GPM) Total operation time 0 to 999 (x 100 hours) BTU requirement for 0 to 999 0 to 999 (×kBTU/h) ON/OFF cycles the Multi-System...
  • Page 48 This page is left blank to preserve facing pages. • On-Demand Water Heater Service Handbook for 240, 340 & 540 Condensing Models...

  • Page 49: Maintenance

    MAINTENANCE Indoor Model (Front View/Cabinet Interior): Three Screws Secure the Secondary Heat Figure 41 . Exchanger to the Case Secondary Heat Exhaust Thermistor High Limit Switch Pipe Heater/Block Heater Exchanger (Heat Exchanger) High Limit Switch (Exhaust) Primary Heat Exchanger Over-heat Cutoff Fuse Condensate (OHCF)
  • Page 50 Outdoor Model (Front View/Cabinet Interior): NOTE: 540 outdoor models include a heat exchanger thermistor and a bypass valve which are not shown in this graphic. However, their locations are shown in the graphic for indoor models (page 49). Three Screws Secure the Secondary Heat Figure 42 .

  • Page 51: Flow Sensor/Control Valve Removal And Installation

    5. Disconnect the flow sensor/ 2. Connect the cold water connection Flow Sensor/ control valve’s wires from the tube (item 466, p. 74) to the Control Valve computer board as described outlet of the flow sensor/control below. See Figure 41 (p. 49) or valve.

  • Page 52: Burner Removal And Installation

    Shut off the gas supply at • Igniter rod wire (black). Burner Removal the gas supply line’s manual See Figure 41, p. 49 shutoff valve. and Installation or Figure 42, p. 50 (center of picture). Once the power and gas have been turned off, Remove the screw that remove the front panel from...
  • Page 53 • NOTICE: DO NOT remove inlet connection. (The gas are difficult to remove, lift the screws along the valve and manifold are still the burner while turning the interior of the manifold connected together.) screws. (See Figure 45.) plate. Complete this sub-step IF You may need to twist the you are replacing the burner gas valve/manifold assembly...

  • Page 54: Burner Installation

    Inspect the gasket. Minor 2. Install the burner into the the gas valve while sliding surface tears are acceptable. combustion chamber. it down for an easier fit. If the gasket shows major The tab on the gas valve separations, replace the There are grooves on the sides connection should line up gasket before the unit is...

  • Page 55: Gas Valve/Manifold Plate: Removal And Installation

    • 5. Install the fuse box assembly to Install the green ground wire parts left over. the left side of the manifold plate. onto the manifold plate. (See Figure 41 (p. 49) or Figure (See “Ground Connection” in the Be sure that you reconnected the 42 (p.

  • Page 56: Gas Valve/Manifold Plate Removal

    fasteners organized and will expedite disconnecting its white (p. 49) OR Figure 42 (p. connector from the 50). reassembly. computer board. Do not remove connectors from the circuit board. WARNING 2. Remove the computer board from Remove the computer board □...

  • Page 57: Gas Valve/Manifold Plate Installation

    Disconnect the clear air tube connection for cuts or breaks. Slide the gas valve/manifold off the left side of the gas plate onto the gas inlet valve. (Figure 49.) If damaged, replace with connection. (The gas inlet is part number 100074242 located at the bottom, right- Remove the screw securing (item 151) and/or...
  • Page 58 Secure the gas valve to the 11. Complete the wiring: See “Temperature Controller” inlet by installing the brass • Refer to Figure 41 (p. 49) or 540 (T-H3) Models. Page 31. screw through both tabs at Figure 42 (p. 50) as you complete See “Temperature Controller.”...
  • Page 59 This page is left blank to preserve facing pages. On-Demand Water Heater Service Handbook for 240, 340 & 540 Condensing Models •...

  • Page 60: Replacing The Heat Exchanger

    with disassembly. This will make 3. Remove the computer board as Replacing the Heat reassembly easier. follows (item 701, page 72; see Exchanger also page 49 or 50): NOTICE: • During the next step, consider taking 1. Shut the unit down as follows: Tools: a digital photo to aid in reassembly.
  • Page 61 Open the clip that secures (top, left of cabinet). Leave NOTICE: If you have a 540 the yellow wires to the that thermostat in place. model, you must pull a bottom, left-hand side of the (See Figure 53.) portion of the tube out of cabinet.
  • Page 62 The wires are locked onto the Disconnect the connector Flame Rod Wire Connector: connectors. Pinch the flat sides on on the left side (blue wires) To remove, pinch at sides at end which goes to the overheat each connector to release it. with your nger nails, then slide cutoff fuse.
  • Page 63 9.11 Inspect the o-ring (item 151, 10.2 Slide the fan toward you to p. 73) and gas inlet ring remove it from the rear slots (item 119, p. 73) at the that hold it in place. Remove gas inlet for cuts or breaks. the fan.
  • Page 64 12. Disconnect and remove the 12.7.1 Locate the bypass valve Heat Exchanger Thermistor (540 Models Only) following items: wires on the left side of the heat exchangers. 12.1 Disconnect the condensate drain line (item 416, page Wire colors: 74) from the secondary Red, Yellow, White, Blue, heat exchanger assembly Brown.

  • Page 65: Preparing The New Primary Heat Exchanger For Installation

    Preparing the ◦ 13.2.3 Remove the eight screws A plate attached at the top that hold the primary and with a gasket surrounding New SECONDARY secondary heat exchangers the flue gas connection to the Heat Exchanger together. (There are two secondary heat exchanger.

  • Page 66: Installing The Heat Exchanger Assembly

    ◦ exhaust flue. 4. Insert the heat exchanger 540 MODELS: Reconnect assembly into the case with its the top and middle • Exhaust thermistor, gasket, bracket, exhaust outlet fitting through the terminations. The bottom and screw. (See items 471, 718, hole in the top of the case.
  • Page 67 8. Reconnect the drain pipe (item drain tube to the port on the bottom Hot Outlet Tube Installation Example: 465) as shown in the diagram on of the secondary heat exchanger. (See page 74. Item 416 on page 74. ) Once tube is installed, secure with fastener 16-25.
  • Page 68 the solenoid valve with the combustion chamber, 16.2 Slide the black igniter the matching number connect it now as shown in wire onto the igniter rod. except as noted below. Figure 58 (p. 63). See “Igniter Rod Wire Connection” in Figure 41, •...
  • Page 69 17.2 Insert the end of the cold pipe 19. Install the fuse box at the location 21. Install the computer board (PCB): into the outlet of the flow shown in Figure 41, page 49. • Small feet at the bottom must fit sensor/control valve.

  • Page 70: Restarting The Unit

    • • INDOOR MODELS: Plug both spade schematics on page Install the connector connectors (blue wires) 30 or page 31. with four white wires onto the heat exchanger’s into the computer board high limit switch. See • 540 MODELS ONLY: as described below.

  • Page 71: Component Diagrams/Item Numbers

    COMPONENT DIAGRAMS/ITEM NUMBERS Case assembly Outdoor model Indoor model Temperature controller Temperature Indoor model remote controller On-Demand Water Heater Service Handbook for 240, 340 & 540 Condensing Models •...
  • Page 72 COMPONENT DIAGRAMS/ITEM NUMBERS (CONT.) Computer board assembly 240 (T-H3J) and 540 (T-H3) model 340 (T-H3S) model 707 722 Surge box assembly • On-Demand Water Heater Service Handbook for 240, 340 & 540 Condensing Models...
  • Page 73 COMPONENT DIAGRAMS/ITEM NUMBERS (CONT.) Burner assembly burner assembly Burner assembly Combustion Chamber Combustion Chamber 109 111 113,114 Manifold Assembly Gas Valve 151,119 540 (T-H3) model On-Demand Water Heater Service Handbook for 240, 340 & 540 Condensing Models •...
  • Page 74 COMPONENT DIAGRAMS/ITEM NUMBERS (CONT.) Water Way assembly Secondary 471, 718, 470, and 053 540 (T-H3) 415,451 model 414,451 240 (T-H3J) and 340 (T-H3S) models 540 (T-H3) model 465, 463 460, 461 460,461 456,458 Bypass section (540 (T-H3) model) Water outlet section Water inlet section •...
  • Page 75 EK159 Case assembly for Indoor model EK164 Case assembly for Outdoor model 100074663 EK187 Front cover for 240 and 340 Indoor (T-H3J-DV and T-H3S-DV) 100074664 EK188 Front cover for 240 and 340 Outdoor (T-H3J-DV and T-H3S-OS) 100074665 EK158 Front cover for 540 Indoor (T-H3-DV)
  • Page 76 COMPONENT ITEM NUMBERS (CONT.) Part # 240, 340, T-H3J, Item # Description and 540 T-H3S models and T-H3 models 100074606 EK109 Fan motor for Indoor models 100074228 EKK25 Fan motor for Outdoor models 100074216 EKK2X Burner gasket 100074466 EM381 Fan damper for Indoor model 100074218 EKK2V Burner window...
  • Page 77 COMPONENT ITEM NUMBERS (CONT.) Part # 240, 340, T-H3J, Item # Description and 540 T-H3S models and T-H3 models 100074398 EKK4J Inlet thermistor for 240 (T-H3J) and 340 (T-H3S) models 100074626 EK137 Inlet thermistor for 540 (T-H3) model 100074680 EK207 Outlet thermistor for 240 (T-H3J) and 340 (T-H3S) models 100074374 EKK1A...
  • Page 78 COMPONENT ITEM NUMBERS (CONT.) Part # 240, 340, T-H3J, Item # Description and 540 T-H3S models and T-H3 models 100074688 EK219 Cold pipe for 240 (T-H3J) and 340 (T-H3S) models 100074689 EK220 Cold pipe for 540 (T-H3) model 100074690 EK222 Stainless heat exchanger out pipe 100074691 EK226...
  • Page 79 COMPONENT ITEM NUMBERS (CONT.) Part # 240, 340, T-H3J, Item # Description and 540 T-H3S models and T-H3 models EK178 Fixing plate 100112572 TM-RE40 Temperature remote controller 100209924 TM-RE42 Temperature remote controller On-Demand Water Heater Service Handbook for 240, 340 & 540 Condensing Models •...
  • Page 80 Copyright © 2016 A.O. Smith Corporation. All rights reserved. • On-Demand Water Heater Service Handbook for 240, 340 & 540 Condensing Models...

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