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A.O. Smith T-D2-OS Service Manual

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CONFIDENTIAL
T-D2-IN/T-D2-OS Service Manual
Ver. 1.00
T-D2-IN / T-D2-OS
On-Demand Water Heater
Service Manual
T-D2-OS
T-D2-IN
A.O. Smith Water Products Company
500 Tennessee Waltz Parkway
Ashland City, TN 37015
Toll Free: 1-877-737-2840
1

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Summary of Contents for A.O. Smith T-D2-OS

  • Page 1 CONFIDENTIAL T-D2-IN/T-D2-OS Service Manual Ver. 1.00 T-D2-IN / T-D2-OS On-Demand Water Heater Service Manual T-D2-OS T-D2-IN A.O. Smith Water Products Company 500 Tennessee Waltz Parkway Ashland City, TN 37015 Toll Free: 1-877-737-2840...

  • Page 2: Table Of Contents

    CONFIDENTIAL T-D2-IN/T-D2-OS Service Manual Ver. 1.00 Table of Contents 1. Specifications………………………………………...…...………….……………………...………………………… 3 2. Exterior view……………………...…….……………………………………………………………………………..4 3. Interior view…………………………….……………………………………………………………………………….. 6 4. List of main components in the interior view…….…………………………………………………….… 8 5. Schematic diagram……………………………………………………………………………………………………. 10 6. Wiring diagram…………………………………………………………………………………………………………. 11 7. Wiring diagram checkpoints for diagnosis………………………..………………….………………….… 12 8.

  • Page 3: Specifications

    CONFIDENTIAL T-D2-IN/T-D2-OS Service Manual Ver. 1.00 1. Specifications Model T-D2-IN T-D2-OS Dimensions H20.5"×W13.8"×D8.5" Weight 39 lbs. 199,000 INPUT BTU/h 11,000 Combustion System Power vent Installation Indoor & Direct-vent Outdoor Fan motor PWM turbo fan PWN multi blade fan motor LP 3.5” WC LP 4.4”...

  • Page 4: Exterior View

    CONFIDENTIAL T-D2-IN/T-D2-OS Service Manual Ver. 1.00 2. Exterior view T-D2-IN Side view Front view Top view Bottom view...
  • Page 5 CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 T-D2-OS Side view Front view Top view Bottom view...

  • Page 6: Interior View

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 3. Interior view T-D2-IN...
  • Page 7 CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 T-D2-OS...

  • Page 8: List Of Main Components In The Interior View

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 4. List of main components in the interior view Items# in Takagi Common parts Description components Part # for other models diagram EK402 (T-D2-IN) Case assembly EKK41 (T-D2-OS) T-K3OS EKH6T (LP model)
  • Page 9 CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 Items# in Takagi Common parts Description components Part # for other models diagram Flow sensor EK438 TU002 (T-D2-IN) Heat exchanger assembly EK437 (T-D2-OS) T-K3, T-K3-Pro, T-K3-SP/OS, Gas inlet EKK1E T-KJr2-IN/OS, T-K4-IN/OS, T-H2-DV/OS...

  • Page 10: Schematic Diagram

    The diagram below refers to both the T-D2-IN and T-D2-OS. 1. When a hot water tap is opened, cold water enters the T-D2-IN or T-D2-OS. 2. The water flow sensor detects this water flow and sends this information to computer.

  • Page 11: Wiring Diagram

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 6. Wiring diagram The diagram below refers to both the T-D2-IN and T-D2-OS. H2 B1 TM-RE30...

  • Page 12: Wiring Diagram Checkpoints For Diagnosis

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 7. Wiring diagram check points for diagnosis The table below applies to both the T-D2-IN and T-D2-OS. Check- Part and Description Color of wires Normal range point White – Black (A) A, A1...
  • Page 13 CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 Check- Part and Description Color of wires Normal range point 1 to 15 VDC (during operation) Gas proportional valve White - red 20 to 40 Ω Red - Black 4 to 5.5 VDC...

  • Page 14: Resistance Values Of The Temperature Thermistors

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 8. Resistance values of the temperature thermistors The T-D2-IN and T-D2-OS use the same thermistors. Resistance values at different temperatures ºF Temperature ºC Resistance kΩ 23.76 19.08 15.43 12.56 10.28 8.47 7.02 5.85...

  • Page 15: Operational Flow Chart

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 9. Operational flow chart The diagram below refers to both the T-D2-IN and T-D2-OS.

  • Page 16: Component Specifications

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 10. Component specifications 10-1. Burners……………………..………………………………………………………………………..………. 17 10-2. Gas manifold………….…………………………………………………………………………………..10-3. Fan motor………………………………………………………………………...…………………………… 19 10-4. Gas valve assembly………………..……………………….…………………………………………….. 20 10-5. Flame rod………………………………………………………….………………………………………….. 21 10-6. AFR rod…………………………………………………………………………………………………………. 22 10-7. Heat exchanger……………………………………………………………………………………………… 23 10-8. Flow adjustment valve…………….………………………………………..……………………….. 24 10-9.

  • Page 17: Burners

    Visual inspection: excessive dust deposit on the burner surface and/or Diagnostic unstable flame conditions during operation. Color/Number of wires The burner for the T-D2-IN and T-D2-OS has the “46V” mark as shown below. Burner damper (#112 / EK412) The burner damper is not included in EKH5W.

  • Page 18: Gas Manifold

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 10-2. Gas manifold Included EKH6T (LP model) Unit Part # Takagi Part # Checkpoint in #102 EKK5K (NA model) 1. The manifold distributes gas from the gas valves to the burners. The...

  • Page 19: Fan Motor

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 10-3. Fan motor EKK25 (T-D2-IN) Unit Part # #103 Takagi Part # Checkpoint EKK54 (T-D2-OS) To provide combustion air into the combustion chamber and to exhaust flue Function gas. 1. Fan speed failure, causing abnormal sounds with or without combustion during operation.

  • Page 20: Gas Valve Assembly

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 10-4. Gas valve assembly Included EKH6T (LP model) Unit Part # Takagi Part # Checkpoint C,H1 in #102 EKK5K (NA model) Opens and closes the gas pathways of the water heater (main and solenoid...

  • Page 21: Flame Rod

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 10-5. Flame rod Unit Part # #108 Takagi Part # EKK0E Checkpoint To detect flames while the water heater is in operation. Function 1. Unable to detect flames when flames actually do occur.

  • Page 22: Afr Rod

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 10-6. AFR rod Unit Part # #108 Takagi Part # EKK0E Checkpoint -Checks flame conditions during combustion. Function -When AFR rod detects unexpected flame conditions, the computer of the water heater makes adjustments in the fan motor speed to compensate.

  • Page 23: Heat Exchanger

    B. Inspect for scale buildup inside the heat exchanger pipes. Scale buildup obstructs proper heat transfer to the water, thereby overheating the heat exchanger and causing damage. Color/Number of wires The heat exchanger of the T-D2-IN and T-D2-OS has the “Pro” mark as shown below. T-D2-IN T-D2-OS...

  • Page 24: Flow Adjustment Valve

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 10-8. Flow adjustment valve Unit Part # #402 Takagi Part # EK438 Checkpoint Controls water flow to properly control the output hot water temperature. Function 1. Water leakage from valve. Failure events 2.

  • Page 25: Flow Sensor

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 10-9. Flow sensor Unit Part # #402 Takagi Part # EK438 Checkpoint Detects and measures water flow rate using a spinning impeller and Function magnetic pick-up. Unable to detect or measure any water flow rate.

  • Page 26: Bypass Valve

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 10-10. Bypass valve Unit Part # #403 Takagi Part # EKK0U Checkpoint 1. Mixes hot water from the heat exchanger with cold water from the water inlet in order to modulate and control the water heater’s outlet water temperature.

  • Page 27: Thermistors

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 10-11. Thermistors #407 (Inlet) EKK38 (Inlet) E1 (Mixing) Unit Part # #408 (Mixing) Takagi Part # EKK1A (Mixing) Checkpoint E2 (Output) #411 (Output) EKK2T (Output) E3 (Inlet) Measures cold/hot water temperatures in the water heater.

  • Page 28: Hi-Limit Switch

    "111" or "121" error code will display. Error codes when hi-limit The T-D2-IN / T-D2-OS don't have the "141" error code that was used in our switch fails previous models. This error code is now replaced by the "111" and the "121"...

  • Page 29: Overheat Cutoff Fuse

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 10-13. Overheat cut off fuse Unit Part # #413 Takagi Part # EK333 Checkpoint -The overheat cutoff fuse contains solder with a melting point of 430˚F (221˚C). -Detects excessive temperatures within the water heater, especially around...

  • Page 30: Freeze Protection Heaters

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 10-14. Freeze protection heaters #414 EKK2R Unit Part # Takagi Part # Checkpoint #415 EKK2P Prevents the heat exchanger, water valves, and water pipes within the water Function heater from freezing. The heaters are but one of the freeze protection devices in the water heater.

  • Page 31: Computer Board

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 10-15. Computer board Unit Part # #701 Takagi Part # EK439 Checkpoint Controls the functions of most of the parts in the water heater. Function Malfunctioning computer Failure events -A component(s) may not operate within the water heater. In most cases...

  • Page 32: Transformer

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 10-16. Transformer Unit Part # #702 Takagi Part # EKH09 Checkpoint A1,A2 -To transform input voltage from 120 to 100 VAC. -Every electrical component of the water heater is designed to only work...

  • Page 33: Igniter

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 10-17. Igniter Unit Part # #711 Takagi Part # EKN74 Checkpoint -To ignite the gas/air mixtures when the water heater is ready to burn gas on Function its burner surface. -The output voltage of the igniter is more than 14 kVDC.

  • Page 34: Freeze Protection Thermostat

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 10-18. Freeze protection thermostat #713 EKJ59 (IN) Unit Part # Takagi Part # Checkpoint #710 EKK40 (OS) Temperature detecting device which prevents the pipes within the water heater from freezing. When this device detects temperatures below 36.5˚F Function (2.5˚C) inside the water heater, power is supplied to the electric heaters to...

  • Page 35: Surge Box

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 10-19. Surge box Unit Part # #703 Takagi Part # EK428 Checkpoint A2,A3 Protects the unit from high voltage and/or high electric current caused by lightning. Function There are 2 types of surge absorbers in the water heater. Surge absorber A is activated by voltage higher than 220V, the other one is activated by voltage higher than 680V.

  • Page 36: Fault Analysis & Specifications

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 11. Fault Analysis & Specifications Remarks: 1. Proper range of values of voltage & resistance shown below. 2. Please refer to the wiring diagram for checkpoint positions. Remove power to the water heater when checking for continuity, disconnections, resistance values, etc.
  • Page 37 CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 Natural of Fault Diagnosis Checkpoint 5 Check that the filter on the cold water inlet is clean. The hot water is not 6 Check whether or not the unit is frozen. available when a fixture 7 Check if there is enough gas in the tank.
  • Page 38 CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 Natural Checkpoint Diagnosis Fault 4 Fault of PCB in the water heater Fluctuation [1] No voltage to gas solenoid valve (SV of hot water Normal: 78 to 100 VDC between COM (blue) & #9 (green)
  • Page 39 CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 Error Code Diagnosis Checkpoint 8 Check if there is grease and dirt in burner and fan motor, when the water heater has been installed in restaurant. 9 Check the manifold pressure in the water heater.
  • Page 40 CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 Error Code Diagnosis Checkpoint 5 Disconnected/damaged O.H.C.F. (Refer to section 10-13) V isual inspection: connection/breakage of wires. Normal: 1 Ω or less between blue & blue 6 Disconnected/damaged hi-limit switch. (Refer to section 10-12) V isual inspection: connection/breakage of wires.
  • Page 41 CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 Error Code Diagnosis Checkpoint 4 Check for soot on the flame rod [1] Clean the flame rod [2] PCB fault During operation: more than 1 μA through the flame rod wire (orange) 5 Disconnected/damaged O.H.C.F.
  • Page 42 CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 Error Code Malfunction description Cancellation method Disconnected AFR rod Turn off the power or water supply Diagnosis Checkpoint 1 AFR rod fault (Refer to section 10-6) V isual inspection: connection/breakage of wires, soot on it.
  • Page 43 CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 Error Code Malfunction description Cancellation method Fan motor fault Turn off the power or water supply Diagnosis Checkpoint 1 PCB and fan motor fault (Refer to section 10-3 & 10-15) V isual inspection of fan motor: connection/breakage of wires or dust buildup (causing electrical shortage) Normal: 110 to 160 VDC between red &...
  • Page 44 CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 Error Code Malfunction description Cancellation method 1 PCB fault [1] Fault of preparation for the mixing thermistor operation. Turn off the power or water supply [2] Fault of driving circuit for Gas Proportional...
  • Page 45 CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 Error Code Malfunction description Cancellation method Restoring proper cable connections among all the water heaters. When the Miscommunication between Parent and Child computer detects proper connections units for Easy Link systems. among all the water heaters, "761" error code will cease to display.

  • Page 46: Controls And Settings

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 12. Controls and settings 12-1. Diagnosis using the TM-RE30………………………………………………….…………………………………….…… 47 12-2. The error-code button: Verifying functionality of computer board, Displaying error code history, and Clearing error code history memory….............………... 12-3. Clearing the “101” and “991” error code……………………………………………………………………………...

  • Page 47: Diagnosis Using The Tm-Re30

    2. Scroll up or down to the needed information (mode #) of the “COLD” Button Button T-D2-IN or T-D2-OS by pressing the “HOT” or “COLD” buttons Button (Fig.1 shows mode #5 being selected.) When selecting information, please refer to the table on p. 49 for the proper mode #.
  • Page 48 2. "0" will be displayed on the TM-RE30. (See Fig. 1) 3. Scroll to the desired T-D2-IN or T-D2-OS unit # in the easy-link system by pressing the "HOT" or the "COLD" buttons to scroll up or down. (Fig. 2 shows that unit #2 is being selecting) NOTE: The definition of the unit #’s:...
  • Page 49 CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 Description of mode numbers in “Diagnostics Mode” Mode # Whole multi-unit system information (#0) Unit information (#1 to #4) Total system flow rate 0 to 999 (×0.1 GPM) Total operation time 0 to 9999 (hours) ON/OFF cycles 0 to 9999 (×100 cycles)

  • Page 50: The Error-Code Button: Verifying Functionality Of Computer Board, Displaying Error Code History, And Clearing Error Code History Memory

    1. Briefly press the “Error-call button” (do not hold down the button). 2. If the T-D2-IN or T-D2-OS has had prior error codes, the 7-seg LED will display the most recent error code first. Pressing the button again will display the 2...

  • Page 51: Clearing The "101" And "991" Error Code

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 12-3. Clearing the “101” and “991” error code The “101” and “991” error codes signify imperfect (abnormal) combustion, caused by insufficient intake air and/or obstructions in the exhaust. A. If the “101” and “991” error code occurs, please check the following: 1.

  • Page 52: Afr Rod Function

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 12-4. AFR rod function <Function> The AFR rod checks flame conditions during combustion. When the AFR rod detects unexpected flame conditions, the computer board of the T-D2 adjusts the fan motor speed to ensure that air and fuel are always at a proper mixture ratio, minimizing emissions.

  • Page 53: Dipswitch Settings

    Ver. 1.00 12-5. Dipswitch settings Upper bank of dipswitches The T-D2-IN shares the computer board with the T-D2-OS. The computer board has two bank of dipswitches: “upper” and “lower”. The upper bank has certain special functions as shown on the following table and generally should not need adjustment.
  • Page 54 CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 The function of the lower bank of dipswitches Functions ON position OFF position Parent / Child setting for Easy-Link systems Parent Child (Default) Model type (Default) Disable T-D2-IN (Default) Disable T-D2-OS Output temperature settings (See table to the right) (Default 122°F)

  • Page 55: Assigning Unit Numbers In The Easy-Link System

    3. Press and hold the "Increase" button on each unit in the new order of your choosing. The new unit numbers will be assigned in this order. Each T-D2-IN or T-D2-OS in an Easy-link system is assigned a random unit #, except for the Parent unit, which is always assigned as unit #1.

  • Page 56: A) On/Off Conditions: Overview

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 12-7. (A) ON/OFF conditions: Overview The following table shows the ON/OFF conditions of the water heater. ON/OFF Conditions The BTU requirement is more than 14,880 BTU/h Conditions needed to turn ON. The water flow rate is more than 0.75 GPM...

  • Page 57: B) On/Off Conditions: Btu Requirements

    T-D2-IN / T-D2-OS Service Manual Ver. 1.00 12-7.(B) ON/OFF conditions: BTU requirements A. Calculating the ON/OFF conditions of the T-D2-IN or T-D2-OS Condition needed to turn the T-D2-IN or T-D2-OS ON – T ) × GPM × 500 > 14,880 Condition needed to turn the T-D2-IN or T-D2-OS OFF –...

  • Page 58: A) Pump Control On/Off Conditions (Only For Single And Easy-Link System)

    Ver. 1.00 12-8. (A) Pump control ON/OFF Conditions (Only for single and Easy-link system) To run circulation pumps efficiently and effectively, the T-D2-IN / T-D2-OS offers mode of pump control. The following table shows the pump control ON/OFF conditions. “Re-circulation mode”...

  • Page 59: B) Pump Control On/Off Conditions: Btu Requirements

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 12-8. (B) Pump control ON/OFF conditions: BTU requirements A. Calculating the ON/OFF conditions of the pump Condition needed to turn the pump ON – T ) × GPM × 500 > 18,600...

  • Page 60: Multi-Unit System On/Off Conditions

    80 - 85 2. Condition required to reduce the number of activated T-D2-IN or T-D2-OS: In the case of reducing down from two units of T-D2-IN or T-D2-OS to one unit of T-D2-IN or T-D2-OS: Flow rate = A / 1.7 All other cases: Flow rate = A ×...

  • Page 61: High-Altitude Region Support Functions (Fm+, Fm++ And Fm+++)

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 12-10. High-Altitude Region Support Functions (FM+, FM++ and FM+++) Using these functions The high-altitude region support functions have four operation levels, with the appropriate level being set up by the installer until the abnormal sound problem is solved.

  • Page 62: Relay Selection For The Pump Control Connection

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 12-11. Relay selection for the pump control connection The maximum current capacity of pump control connection in the T-D2 is 1 amp. Before using any relay with the pump control, please check the specifications of that particular relay to ensure that the current value through the coil will not exceed 1 amp.

  • Page 63: Adjusting Manifold Gas Pressure

    3. Connect a manometer to the manifold port using a tube (Figure 2). Ensure that this connection is secure enough to prevent gas leak. 4. Run water through the T-D2-IN or T-D2-OS to activate its operation. If presence of a gas leak is detected, immediately shut off the T-D2-IN or T-D2-OS and inspect the tube/manifold connection;...
  • Page 64 CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 6. After gas pressure has been set, deactivate the T-D2-IN or T-D2-OS, remove the manometer tube, and replace the port screw. Figure 1 Manifold port Figure 2 Tube Figure 3 MAX button...

  • Page 65: Manually Adjusting The Fan Motor Speed

    WARNING Adjusting maximum fan motor speed 1. While T-D2-IN or T-D2-OS is in operation, set dipswitch No.3 to the “ON” position. (Figure 1) 2. On the temperature remote controller, display mode #3 (fan motor speed) by entering the “Diagnostics mode” (Refer to Section 12-1).

  • Page 66: Freeze Protection System

    The three heating blocks focus on protecting the inlet and outlet piping inside the T-D2-IN or T-D2-OS, as well as the front drum pipe. The conditions to activate either feature are different from each other. However, the two features are not mutually exclusive, because they focus on different areas of the T-D2-IN or T-D2-OS.
  • Page 67 37°F and below T-D2-OS installation: After 25 minutes have elapsed since the T-D2-IN or T-D2-OS’s previous firing operation, the computer will continually check the temperatures of the inlet and output thermistors. The automatic firing system will not activate at all unless these 25 minutes have elapsed.
  • Page 68 The blocks will only activate based on what the freeze protection thermostat senses. The thermostat is located on the fan motor, close in vicinity to the inlet and outlet pipes within the T-D2-IN or T-D2-OS. Electrical power is required for this feature to operate.

  • Page 69: Draining The Unit And Cleaning The Inlet Water Filter

    12-15. Draining and cleaning the inlet water filter Close the manual gas shut off valve. 2. Turn off power to the T-D2-IN or T-D2-OS, wait a few seconds. And then turn on again. 3. Wait 30 seconds for water valves starts to completely open.

  • Page 70: Components Diagrams

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 13. Components diagrams Case assembly T-D2-IN T-D2-OS...

  • Page 71: Burner Assembly

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 Burner assembly T-D2-IN/OS Burner assembly Power control section T-D2-IN Manifold Fan motor section for IN models assembly T-D2-OS Fan motor section for OS models...
  • Page 72 CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 Computer T-D2-IN/OS board assembly Water way assembly T-D2-IN/OS Bypass section Exhaust section (OS model) Water outlet section Water inlet section...

  • Page 73: Parts List

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 14. Parts list Item # Part # Description Common parts for other models EK402 Case assembly (IN) T-K4-IN EKK41 Case assembly (OS) T-K3-OS, T-K4-OS EK434 Front cover (IN) EK435 Front cover (OS)
  • Page 74 CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 Item # Part # Description Common parts for other models T-K3, T-K3-Pro, T-K3-SP/OS, T-H2-DV/OS, EM167 Wire clamp 60 T-KJr2-IN/OS, T-K4-IN/OS, T-M50, T-M32 EKH5W Burner assembly T-H2-DV/OS, T-K4-IN/OS EKH6T Manifold with gas valve assembly LP...
  • Page 75 CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 Item # Part # Description Common parts for other models EKK2N Combustion chamber tube (In) T-K3, T-K3-Pro, T-K3-SP, T-H2-DV/OS, T-K4-IN EX019 Combustion chamber tube (Out) T-K4-OS, T-M50 T-K3, T-K3-Pro, T-K3-SP/OS, T-H2-DV/OS, EKK1E...
  • Page 76 CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 Item # Part # Description Common parts for other models T-K3, T-K3-Pro, T-K3-SP/OS, T-KJr2-IN/OS, Outlet drain plug EKK2E T-K4-IN/OS, T-M50 EKK2T T-K3, T-K3-Pro, T-H2-DV/OS, T-M50, T-M32 Output thermistor T-K3, T-K3-Pro, T-K3-SP/OS, T-H2-DV/OS, T-M50,...
  • Page 77 CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 Item # Part # Description Common parts for other models EM192 Fastener “16A” T-K3, T-K3-Pro, T-K3-SP/OS, T-KJr2-IN/OS, T-K4-IN/OS EKK39 Fastener “16-25A” T-K3, T-K3-Pro T-K3, T-K3-Pro, T-K3-SP, T-H2-DV, T-KJr2-IN/OS, EKN50 Silicon ring T-K4-IN/OS, T-M32...

  • Page 78: Revisions

    CONFIDENTIAL T-D2-IN / T-D2-OS Service Manual Ver. 1.00 15. Revisions Version Description of changes Date 1.00 First edition 11/01/10...

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