CONFIDENTIAL T-M32 / T-M32 ASME Service manual Ver. 1.03 T-M32 / T-M32 ASME On-demand Water Heater Service manual T-M32 A.O.
CONFIDENTIAL T-M32 / T-M32 ASME Service manual Ver. 1.03 Table of Contents 1. Specifications………………………………………...…...………….……………………...………………………… 3 2. Exterior view…………………………………………………………………………………………………………….. 4 3. Interior view….………………………………………………………………………………………………………….. 4. List of main components in the interior view………………………………….…………………………. 5 6 5. Schematic diagram…………………………………………………………………………………………..……….. 8 6. Wiring diagram…………………….………………………………………………………………………..…………. 7.
CONFIDENTIAL T-M32 / T-M32 ASME Service manual Ver. 1.03 1. Specifications Unit Model T-M32 / T-M32 ASME Unit dimensions H 23.6"×W 18.5"×D 8.9" Weight 59 lbs. Combustion INPUT BTU/h Water control Operation 240,000 Min 24,000 Combustion System Power vent Installation Indoor, Outdoor, Direct vent Fan motor PWM Turbo fan Manifold Pressure* Future Max LP 3.4” WC Natural 2.3”W.C LP 0.7 WC Natural 0.5” WC Max Min Flow rate 0.5 to 9.0 GPM Available set temp.
CONFIDENTIAL T-M32 / T-M32 ASME Service manual Ver. 1.03 2. Exterior view Side view Front view 18-1/2" (470mm) 8-7/8" (226mm) 15-3/4" (399mm) 7" (179mm) 101mm) 2 3- 5 / 8 " ( 6 0 0 m m ) 4" ( 2 4 - 5 /8 "( 62 6 m m ) 4 -1 / 2 " (1 1 4 m m ) 1 - 1 / 8 " ( 2 7 .8 m m ) C O L D 3 - 1 / 8 " ( 8 0 .8 m m ) 4 - 5 / 8 " ( 1 1 8 .3 m m ) 5 - 1 / 2 "( 1 4 2 m m ) 6 - 1 /4 " ( 1 59 mm ) Bottom view 4 - 5 / 8 "( 1 1 8 .
CONFIDENTIAL T-M32 / T-M32 ASME Service manual Ver. 1.03 3.
CONFIDENTIAL T-M32 / T-M32 ASME Service manual Ver. 1.03 4. List of main components in the interior view Items# in No.
CONFIDENTIAL T-M32 / T-M32 ASME Service manual Ver. 1.03 Items# in No.
CONFIDENTIAL T-M32 / T-M32 ASME Service manual Ver. 1.03 5. Schematic diagram Exhaust Heat Exchanger Air-fuel ratio rod Flame rod Hi-limit switch Output Thermistor O.H.C.F Igniter rod Fan motor Burner Igniter Water control valve Gas solenoid valve 3 PCB Gas solenoid valve 1 GFI Gas solenoid valve 2 Transformer Main gas valve Flow sensor Gas proportional valve Surge box Mixing Thermistor Inlet A120 C 1VAC 20V Hot water Thermistor Gas Cold water 1.
CONFIDENTIAL T-M32 / T-M32 ASME Service manual Ver. 1.03 6.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 7. Wiring diagram check points for diagnosis Checkpoint Parts and Description Color of wires White – Black (A) Normal Range A, A1 100 V Power supply A2,A3 120 V Power supply Black - White 108 to 132 VAC B Igniter Purple – Purple 90 to 110 VAC Brown – Brown (A1) Light blue - blue at COM (MV) Green - blue at COM (SV1) C Gas valves Orange - blue at COM (SV2) Red - blue at COM (SV3) 90 to 110 VAC 78 to 100 VDC (during operation) / 0.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 Checkpoint H2 Parts and Description Flow sensor Color of wires Normal Range Red - Black 4 to 5.5 VDC White(+) – Black(GND) 1 to 4 VDC (1,200 Pulse/min) Yellow – AFR rod Air-fuel ratio rod (Between AFR rod and the computer board) I Orange – Flame rod Flame rod (Between flame rod and the computer board) J Water control valve More than 0.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 8. Resistance values of the temperature thermistors Resistance values at different temperatures Temperature ºF 32 41 50 59 68 77 86 95 104 113 ºC 0 5 10 15 20 25 30 35 40 45 Resistance kΩ 23.76 19.08 15.43 12.56 10.28 8.47 7.02 5.85 4.90 4.12 Temperature ºF 122 131 140 149 158 167 176 185 194 203 212 ºC 50 55 60 65 70 75 80 85 90 95 100 kΩ 3.49 2.96 2.53 2.16 1.86 1.60 1.39 1.21 1.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 9. Operational flow chart Power supply ON FAV&BV open Operation SW ON Remove cause Opeartion lamp OFF Pre-check NORMAL? YES NO Operation stop Faucet opens Water Flow Above 0.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 10. Component specifications 10-1. Burners……………………..…………………………………………….………………………....………. 15 10-2. Gas manifold…………….…………………………..…………………………………………………..... 16 10-3. Fan motor……………………………………………………………………….………………………...… 17 10-4. Gas valve assembly……………………………………….……………………………………….……. 18 10-5. Flame rod………………………………………………………….………………………………………… 10-6. AFR rod……………………………………………………………………………..………………………… 19 20 10-7. Heat exchanger…………………………………………………………….....
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 10-1. Burners Unit Part # #101 AOS Part # EM410 Checkpoint N/A There are 2 types of burners in the water heater: the gas-rich burner stabilizes the flames within the combustion chamber and the air-rich burner Function produces more heat in the combustion chamber. The burners facilitate the air/gas mixture necessary to produce the proper heat during the combustion reaction. 1. Unable to initialize/sustain combustion. 2.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 10-2. Gas manifold Unit Part # #120 AOS Part # EM440 (LP model) EM441 (NA model) Checkpoint N/A 1. The manifold distributes gas from the gas valves to the burners. The manifold has two types of the nozzles: one type for gas-rich burners (20 Function nozzles) and the other for air-rich burners (19 nozzles) 2. There are 3 zones within the manifold, to ensure efficient combustion operation. 1. Dust deposit on the manifold. 2.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 10-3. Fan motor Unit Part # #115 AOS Part # EKK25 Checkpoint G To provide combustion air into the combustion chamber and to exhaust flue gas. 1. Fan speed failure, causing abnormal sounds with or without combustion during operation. Failure event 2. Unexpected activation caused by the connectors of the fan motor getting wet. 3. Disconnects from the bottom of the combustion chamber. 1.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 10-4. Gas valve assembly Unit Part # Function #120 AOS Part # EM440 (LP model) EM441 (NA model) Checkpoint C,H1 Opens and closes the gas pathways of the water heater (main and solenoid gas valves) Modulates the gas flow from the gas inlet (proportional gas valve) 1. Gas leak from the valves. Failure event 2. Unable to open /close (main and solenoid gas valves) 3. Unable to modulate the gas flow (proportional gas valve) 1.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 10-5. Flame rod Unit Part # #106 AOS Part # EKK0E Checkpoint I To detect flames while the water heater is in operation. Function 1. Unable to detect flames when flames actually do occur 2. Detecting a false flame when no flames actually occur 1. The water heater stops operating. The "111" and/or "121" error code(s) Effects on the water will display. heater if flame rod fails 2. The water heater will not initiate the ignition process.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 10-6. AFR rod Unit Part # #106 AOS Part # EKK0E Checkpoint I -Checks flame conditions during combustion. -When AFR rod detects unexpected flame conditions, the the computer of the water heater makes adjustments in the fan motor speed to compensate. 1. Unable to detect flames when flames actually do occur Failure event 2. Detecting a false flame when no flames actually occur 1. The water heater will not initiate the ignition process.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 10-7. Heat exchanger EM415 Check (Regular model) Unit Part # AOS Part # N/A EM45C #211 (ASME model) point (ASME model) Absorbs heat from combustion and transfer it to water through the heat Function exchanger pipes. 1. Clogged heat exchanger fins and/or cracks on the heat exchanger walls. Failure event 2. Leaking exhaust gas. 3. Improper heat transfer can cause the water in heat exchanger to boil. 1.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 10-8. Flow sensor Unit Part # #429 AOS Part # EKH33 Checkpoint H2 Detects and measures water flow rate using a spinning impeller and magnetic pick-up. Unable to detect or measure any water flow rate. Function Failure event Effects on the water heater if flow sensor Ignition sequence does not start (water heater will not initiate any operation) fails Error codes when the 441 (only within Easy-link and Multi-unit systems) flow sensor fails 1.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 10-9. Water control valve (flow adjustment valve and bypass valve) Unit Part # #423 AOS Part # EKH32 Checkpoint J The water control valve in the water heater has three functions of water control: flow adjustment, bypass, and two-way) This valve is exactly the same as the water valve in the T-M50. Its functions are as follows: 1. Controls water flow to properly control the output hot water temperature.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 10-9. Water control valve (flow adjustment valve and bypass valve) Color / Number of wires Blue-Brown 13.0 to 16.0 VDC Orange-Brown ON: 12.5 to 16.0 VDC Red-Brown (0° position) 1 VDC less OFF: 0 to 1 VDC 3-3/ 8" (8 7mm) 3 - 3 / 4 " ( 9 5 .6 m m ) The water control valve contains the flow adjustment valve and the bypass valve.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 10-10. Thermistors #422 (Inlet) Unit Part # EKK38 (Inlet) #433 (Output) AOS Part # E1 (Mixing) EKK2T (Output) #418 (Mixing) Checkpoint EX00H (Mixing) E2 (Output) E3 (Inlet) Function Measure cold / hot water temperatures in the water heater. Failure event Unable to properly measure water temperatures within the water heater. Effects on the water If the thermistors fail open or short, error code appears before starting operation.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 10-11. Hi-limit switch Unit Part # #432 AOS Part # EKN34 Checkpoint C1 -Based on bi-metal thermal expansion. -Detects excessively high water temperature (more than 194˚F or 90˚C) in pipes of the heat exchanger. Function -After detection, communication between the computer board and gas valves are severed, shutting down the water heater instantly. The "111" or "121" error codes will display. 1.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 10-12. Overheat cutoff fuse Unit Part # #403 AOS Part # EM387 Checkpoint C2 The overheat cutoff fuse contains solder with a melting point of 430˚F (221˚C). Detects excessive temperatures within the water heater, especially around Function the heat exchanger and combustion chamber. Upon detection, communication between the computer board and gas valves will sever, shutting down the water heater instantly.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 10-13. Freeze protection heaters #404 Unit Part # #410 #415 EKN86 AOS Part # #426 EX002 EKK2P Checkpoint L EM45V Prevents the heat exchanger, water valves, and water pipes within the water heater from freezing. The heaters are but one of the freeze protection devices in the water heater. Open circuit failure: ceramic heaters do not receive the voltage needed to Failure event heat up.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 10-14. Computer board Unit Part # #701 AOS Part # EM376 Checkpoint Function Controls the functions of the most parts in the water heater. Failure event Malfunctioning computer N/A When the computer board failed, the control from the computer and/or the multi-system control will be abnormal. The following are the typical examples of when the computers fail: 1. Unable to control proper combustion during operation. 2.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 10-15. Transformer Unit Part # #702 AOS Part # EM454 Checkpoint A1,A2 -To transform input voltage from 120 to 100 VAC. -Every electrical component of the water heater is designed to only work Function with a 100 VAC power supply, therefore, the T-M32 comes equipped with this transformer. 1. There is no power coming from the transformer. Failure event 2. The voltage from the power supply cannot be converted to 100 VAC. 1.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 10-16. GFI Unit Part # #712 AOS Part # EM207 Checkpoint A,A1 -Detects electrical leakage in the water heater. -Stops providing power to the water heater in the case of electrical leakage. 1. ON-failure: Always in the ON mode (never trips). Failure event 2. OFF-failure: Always in the OFF mode (always stays tripped). 1. ON-failure: GFI cannot detect electrical leakage within the water heater. Effects on the water 2.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 10-17. Igniter Unit Part # #125 AOS Part # EKN74 Checkpoint B -To ignite the gas / air mixtures when the water heater is ready to burn gas on its burner surface. -The output voltage of the igniter is more than 14 kVDC. 1. Unable to ignite during the ignition process. Failure event 2. Makes attempts to ignite at all times. 1.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 10-18. Freeze protection thermostat Unit Part # #117 AOS Part # EKJ59 Checkpoint L Temperature detecting device which prevents the pipes within the water heater from freezing. When this device detects temperatures below Function 36.5˚F (2.5˚C) inside the water heater, power is supplied to the electric heaters to prevent the water heater from freezing. 1.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 10-19. Surge box Unit Part # #715 AOS Part # EM385 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 220 V, the other one is activated by voltage higher than 680 V. 1. Open-failure of the absorber and/or fuse. Failure event 2. Short-failure of the absorber. 1.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 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. 3. Remove power to water heater when checking for continuity, disconnections, resistance values, etc.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 Natural of Fault Diagnosis Checkpoint ・The hot water is not 5 Check that the filter on the cold water inlet is clean. available when a fixture 6 Check whether or not the unit is frozen. 7 Check if there is enough gas in the tank. (for propane units) is opened ・The hot water turns cold 1 Check whether the flow rate is high enough to keep the water heater running.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 Natural Fault of Diagnosis Checkpoint ・ Fluctuation 4 Fault of PCB in the water heater of hot water [1] No voltage to gas solenoid valve (SV1). Normal: 78 to 100 VDC between COM (blue) & #9 (green) temperature (during operation) [2] No voltage to gas solenoid valve (SV3). Normal: 78 to 100 VDC between COM (blue) & #73 (red) (during operation) 5 Gas solenoid valve (SV 1) fault [1] Disconnected wiring to gas solenoid valve (SV1) Normal: 1.3 to 1.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 Error Code 101 Error Code Diagnosis 8 Check if there is dust and lint in burner and heat exchanger, when the water heater has been installed in laundry room. 9 Check if there is grease and dirt in burner and fan motor, when the water heater has been installed in restaurant. 10 Check the manifold pressure in the water heater.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 Error Code 111 Error code is shown after three failed attempts at ignition Diagnosis Checkpoint 6 Disconnected / damaged hi-limit switch. (Refer to section 10-11) V isual inspection: connection / breakage of wires. Normal: 1 Ω or less between blue & blue 7 Inspect flame rod [1] Check for any soot on the rod. [2] Check the connection of ground wire; make sure there is firm contact to the ground of the water heater.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 Error Code 121 Error code is shown after three failed attempts at ignition Error Code Diagnosis 5 Disconnected / damaged O.H.C.F. (Refer to section 10-12) V isual inspection: connection / breakage of wires. Normal: 1 Ω or less between blue & blue 6 Check if hi-limit switch is properly functioning. 7 Disconnected / damaged hi-limit switch. (Refer to section 10-11) V isual inspection: connection / breakage of wires.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 Error Code Malfunction description Disconnected AFR rod 391 Error Code 441 Cancellation method 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.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 Error Code 551 Malfunction description Cancellation method Fault of driving circuit for any of the gas solenoid valves (SV1, SV2, and/or SV3) Turn off the power supply (The computer checks the condition of the solenoid valves 6 hours after every operation) Diagnosis Checkpoint 1 PCB and /or gas valve fault (Refer to section 10-4 & 10-14) V isual inspection of gas valves: connection / breakage of wires.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 Error Code Malfunction description Pump failure 631 Cancellation method Turn off the power Diagnosis Checkpoint 1 Check whether the pump connected to PCB works properly.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 Error Code 701 Error Code Malfunction description 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 Valve(VG0) Diagnosis Checkpoint 1 Check the PCB and /or gas proportional valve (Refer to section 10-4 &10-14) V isual inspection PCB: connection / breakage of wires andor burn marks on the computer board.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 Error Code 761 Malfunction description Cancellation method Restoring proper cable connections between all the T-M32’s and the multi-unit controller (TM-MC01). When Miscommunication between Parent and Child the computer detects proper connections units for Easy-Link systems or Multi-Unit system. between the multi-unit controller and the units (water heater), "761" error code will cease to display.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 12. Controls and settings 12-1. Diagnosis using the remote controller………………....………….….…………….….……...…..……….….……… 47 12-2. The error-call button: Verifying functionality of computer board, Displaying error code history, and Clearing error code history memory…………….………………………….…………………………. 50 12-3. Clearing the “101” and “991”error code…………………………………………………………………………………. 51 12-4. AFR rod function……………………………………………………………………………………………………………………. 52 12-5.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 12-1. Diagnosis using the remote controller 1. Press the "HOT" button and the "COLD" button simultaneously for “TIME” at least 5 seconds to enter “Diagnostic mode”. 2. Scroll up or down to the needed information (mode #) of the Button “HOT” Button “COLD” Button T-M32 by pressing the “HOT” or “COLD” buttons. (Fig.1 shows mode #5 being selected.) When selecting information, please refer to the table on p.49 for the proper mode #.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 < For multiple units in the Multi-unit system and the Easy-Link system > 1. Press and hold the "HOT" and "COLD" buttons simultaneously for at least 5 seconds to enter “Diagnostics Mode”. 2. "0" will be displayed on the remote controller. (See Fig. 1) 3. Scroll to the desired T-M32 unit # in the multi-unit system or the easy-link system by pressing the "HOT" or the "COLD" buttons to scroll up or down.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 Description of mode numbers in “Diagnostics Mode” Mode # 1 2 3 4 5 6 7 8 9 10** Whole multi-unit system information (#0) Total system rate 0 to 9,999 (×0.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 12-2. The error-code button: Verifying functionality of computer board, Displaying error code history, and Clearing error code history memory The T-M32 has the “Error-call button” on the computer board that provides three main functions listed below. The button is located next to the 7-seg LED (as shown in the picture to the right). 7-seg LED Error-call button A. Check if the computer board works properly 1.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 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. What is the water heater models gas-type: liquid propane or natural gas? 2. How long has the water heater been installed and been in use? 3.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 12-4. AFR rod function The AFR rod checks flame conditions during combustion. When the AFR rod detects unexpected flame conditions, the computer board of the T-M32 adjusts the fan motor speed to ensure that air and fuel are always at a proper mixture ratio, minimizing emissions.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 12-5. Dipswitch settings Right bank of dipswitches The T-M32 shares the computer board with the T-M32 ASME. There are two banks of dipswitches (right and left bank) on the T-M32 computer board. The right bank has certain special functions as shown on the following table and generally should not need adjustment. Carefully verify the functions of each dipswitch before changing any Left bank of settings.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 The functions of the left dipswitch bank No. Functions and Dipswitch settings 1 Output temperature settings 2 (See the table below) 3 (Default 120 °F) 100 F 115 F 120 F 135 F 145 F 155 F 165 F 185 F N O N O N O N O N O N O D-PRT MST TMP1 TMP2 TMP3 MODE DIRE OUT D-PRT MST No.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 12-6. Assigning unit numbers in the Easy-link system A. How to display the unit number Press the “Unit # display” button on the computer board. The 7-seg LED will then display the assigned number for that T-M32 unit for 10 sec. NOTE: In a single-unit installation, the numbering system is disabled. B. How to reset and reconfigure the numbering of units Unit #’s can be reset and reassigned manually: 1.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 12-7. (A) ON/OFF conditions: Overview The following table shows the ON/OFF conditions of the water heater. ON / OFF Conditions For Every pump modes The BTU requirement is more than 14,880 BTU/h Conditions needed to turn ON. AND The water flow rate is more than 0.5 GPM The BTU requirement is less than 11,900 BTU/h OR Inlet temperature is higher than the set Conditions needed to turn OFF.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 12-7.(B) ON/OFF conditions: BTU requirements A. Calculating the ON/OFF conditions of the T-M32 【Condition needed to turn the T-M32 ON】 (Tset – Tin) × GPM × 500 > 14,880 【Condition needed to turn the T-M32 OFF】 (Tset – Tin) × GPM × 500 <11,900 or Tin = Tset Where: Tset = Set temperature and Tin = Inlet temperature B. Calculation example Set temperature: Tset = 120˚F Flow rate = 2.5 GPM 【Condition needed to turn the T-M32 ON】 (120 – Tin) × 2.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 12-8. (A)Pump control ON / OFF Conditions (Only for single and Easy-link system) To run circulation pumps efficiently and effectively, the T-M32 offers four different modes of pump control. The following table shows the pump control ON/OFF conditions for different modes. To change pump control modes, see section 12-5 for dipswitch settings. “Normal mode” and “Storage tank circulation mode” There are no specific ON/OFF conditions for these two modes.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 12-8. (B) Pump control ON/OFF conditions: BTU requirements for Re-circulation mode A. Calculating the ON/OFF conditions of the pump 【Condition needed to turn the pump ON】 ( Tset – Tin ) × GPM × 500 > 14,880 【Condition needed to turn the pump OFF】 5 minutes after activation, if the computer detects a BTU requirement of less than 18,600 BTU/h, the computer will stop the pump 90 seconds.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 12-9. Multi-unit system ON / OFF conditions In Easy-link system and Multiple-system, the amount of T-M32’s called on to activate depends on the FLOW RATE and the SET TEMPERATURE. 1. Condition required to activate an additional T-M32: Flow rate required to activate additional T-M32 = A × n Where n= number of currently activated T-M32’s and A is dependent on the set temperature.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 3. Example: Set temperature = 120˚F in a 20-unit system and priority unit is No. 1 (See the table below) To activate additional T-M32’s Unit No. To reduce number of activated T-M32’s Flow rate GPM L/min No.1 ON 0.5 1.9 No.2 ON 3 No.3 ON Unit No. Flow rate GPM L/min No.20 OFF 62 234 13 No.19 OFF 58 221 7 26 No.18 OFF 55 208 No.4 ON 10 39 No.17 OFF 52 195 No. 5 ON 14 52 No.16 OFF 48 182 No. 6 ON 17 65 No.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 12-10. Operation time for unit rotation The unit that turns on first is whichever unit the T-M32 decides is the primary unit. The priority unit will rotate when it reaches 100 ON / OFF cycles or after 12 hours of operation. NOTE: The priority unit is the unit that turns on first when there is a hot water demand. When there is a black out and/or cut off for over 50 minutes, priority unit will switch back to Unit #1.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 12-11. Individual unit operation in multiple-system while multi-unit controller (TM-MC01) is under abnormal conditions (Individual operation mode) A multi-unit system of T-M32s requires the multi-unit controller. If the multi-unit controller undergoes abnormal conditions, the T-M32s can operate as individual units. If this happens, the minimum flow rate of the system changes from 0.5 GPM to 0.5 GPM multiplied by the number of T-M32s.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 12-12. High-Altitude Region Support Functions (FM+ and INPUT-) ＜Using this function＞ The high-altitude region support functions have three operation levels, with the appropriate level being set up by the installer until the abnormal sound problem is solved. The desired level can be specified at the right bank of dipswitches (No.2 and No.3) on the computer board. Level 0 1 2 Function Standard setting Setting Method Right bank of dipswitches No.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 12-13. Checking the Flow Rate by Computer Board ＜Function＞ This function offers a method for checking the flow rate in the water heater’s troubleshooting operations without having to use the remote controller. The flow rate check is performed simply by using the “7-Seg LED” on the computer board and the “Increase” button. The procedure given below can be used to indicate the current flow rate (detected by the flow sensor) at the “7-Seg LED”.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 12-14. Relay selection for the pump control connection The maximum current capacity of the T-M32’s pump control connection is 1 amp. Before using 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. For example To the right, there is a sample of relay specifications from an arbitrary brochure.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 12-15. Adjusting manifold gas pressure The manifold gas pressure on the T-M32 can be adjusted by following the procedures below. Adjusting the manifold pressure can cause unexpected combustion conditions during operation, which can cause a health hazard, damage the T-M32, and/or shorten its lifespan. Therefore, changing the manifold pressure is not recommended unless there are very WARNING strong reasons to do so (e.g.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 desired value. 6. After gas pressure has been set, deactivate the T-M32, remove the manometer tube, and replace the port screw.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 12-16. Manually adjusting the fan motor speed While the FM+ dipswitch will automatically increase the fan speed by 7.5%, the fan motor speed on the T-M32 can also be manually adjusted. In order to perform manual adjustments to the speed, a remote controller is required.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 12-17. Freeze protection system There are two features to the T-M32’s freeze protection system: the automatic fan motor system and the ceramic heating blocks. The automatic fan motor system allows the T-M32 to briefly do fan motor operation and the ceramic heating blocks will heat up whatever portion of the heat exchanger the blocks are strapped to.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 When the computer checks for these temperatures during the fan motor operation as freeze protection, the Automatic fan motor system will deactivate if: Tout > Tin + 3.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 12-18. Freeze protection for recirculation systems The T-M32 has the freeze protection function for a re-circulation system by using a pump installed in the system. Basically, this function is only ON / OFF control of the pump from the computer in the T-M32. When the computer detects the potential of the system freezing, the pump in the system starts automatically.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 To set the Freeze protection pump mode in T-M32, please follow the procedures below: 1. While in Standby mode (cannot be in combustion, forced-combustion, or FM adjustment modes), press and hold the “Increase” button for 5 seconds or longer to start a display of “A” at “7-seg LED” on the computer board. 2. While “A” is displayed, press the “Number display” button.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 12-19. Draining the unit and cleaning the inlet water filter 1. Close the manual gas shut off valve. 2. Turn off power to the T-M32, wait a few seconds. And then turn on again. 3. Wait 30 seconds for water valves starts to completely open. Then turn off power to the T-M32, yet again. 4. Close the water shut off valve. 5. Open all hot water taps in the house. When the all water flow has ceased, close all hot water taps. 6.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 13. Components diagrams Case assembly 0 52 702 0 51 0 51 00 4 0 52 003 050 001 005 0 10 011 007 051 0 52 00 7 0 04 052 006 050 00 2 052 008 703 052 Computer board assembly Other than Part# 706, the T-M32 and the T-M32 ASME share the same components.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 Burner assembly The T-M32 and theT-M32 ASME share the same components.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 Other than Part# 211, Part#439, Part#440 and Part# 441, the T-M32 and the T-M32 ASME share the same components.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 14.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.
CONFIDENTIAL T-M32 / T-M32 ASME Service Manual Ver. 1.03 15. Records of revision of this manual Version Changes Date 1.00 Sample evaluation 06/27/08 1.01 Revised by the R&D and Takagi Japan 12/09/08 1.02 Revised by the R&D and Takagi Japan 02/12/09 1.
