A.O. Smith 240 T-H3J Service Manual Download Page 52

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Page

240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial

Ver. 1.00

CONFIDENTIAL

Error Code

Malfunction description

Cancellation method

321

ŝƐĐŽŶŶĞĐƚĞĚͬƐŚŽƌƚͲĐŝƌĐƵŝƚĞĚŝŶůĞƚƚŚĞƌŵŝƐƚŽƌ

dƵƌŶŽĨĨƚŚĞƉŽǁĞƌŽƌǁĂƚĞƌƐƵƉƉůǇ

Diagnosis

Check point

ϭ/ŶůĞƚƚŚĞƌŵŝƐƚŽƌĨĂƵůƚ

(Refer to section 10-12)

sŝƐƵĂůŝŶƐƉĞĐƚŝŽŶ͗ĐŽŶŶĞĐƚŝŽŶͬďƌĞĂŬĂŐĞŽĨǁŝƌĞƐĂŶĚͬŽƌĚĞďƌŝƐŽŶ

thermistor.

ŚĞĐŬǀŽůƚĂŐĞͬƌĞƐŝƐƚĂŶĐĞďĞƚǁĞĞŶďůĂĐŬΘďůĂĐŬ;ηϰϮͿ͘
ZĞĨĞƌƚŽ^ĞĐƚŝŽŶϴ;ͿĨŽƌƉƌŽƉĞƌƌĂŶŐĞŽĨǀĂůƵĞƐ͘

Error Code

Malfunction description

Cancellation method

331

ŝƐĐŽŶŶĞĐƚĞĚͬƐŚŽƌƚͲĐŝƌĐƵŝƚĞĚŽƵƚůĞƚƚŚĞƌŵŝƐƚŽƌ

(Only 540 (T-H3) models)

dƵƌŶŽĨĨƚŚĞƉŽǁĞƌŽƌǁĂƚĞƌƐƵƉƉůǇ

Diagnosis

Check point

ϭ,ĞĂƚĞǆĐŚĂŶŐĞƌƚŚĞƌŵŝƐƚŽƌĨĂƵůƚ

(Refer to section 10-12)

sŝƐƵĂůŝŶƐƉĞĐƚŝŽŶ͗ĐŽŶŶĞĐƚŝŽŶͬďƌĞĂŬĂŐĞŽĨǁŝƌĞƐĂŶĚͬŽƌĚĞďƌŝƐŽŶ

thermistor.

ŚĞĐŬǀŽůƚĂŐĞͬƌĞƐŝƐƚĂŶĐĞďĞƚǁĞĞŶďůĂĐŬΘďůĂĐŬ;ηϭϮͿ͘
ZĞĨĞƌƚŽ^ĞĐƚŝŽŶϴ;ͿĨŽƌƉƌŽƉĞƌƌĂŶŐĞŽĨǀĂůƵĞƐ͘

Error Code

Malfunction description

Cancellation method

391

Disconnected AFR rod

dƵƌŶŽĨĨƚŚĞƉŽǁĞƌŽƌǁĂƚĞƌƐƵƉƉůǇ

Diagnosis

Check point

ϭ&ZƌŽĚĨĂƵůƚ

(Refer to section 10-6)

sŝƐƵĂůŝŶƐƉĞĐƚŝŽŶ͗ĐŽŶŶĞĐƚŝŽŶͬďƌĞĂŬĂŐĞŽĨǁŝƌĞƐ͕ƐŽŽƚŽŶŝƚ͘

Error Code

Malfunction description

Cancellation method

341

ŝƐĐŽŶŶĞĐƚĞĚͬƐŚŽƌƚͲĐŝƌĐƵŝƚĞĚĞǆŚĂƵƐƚƚŚĞƌŵŝƐƚŽƌ
;KŶůǇŝƌĞĐƚsĞŶƚ/ŶĚŽŽƌŵŽĚĞůƐŽŶůǇͿ

dƵƌŶŽĨĨƚŚĞƉŽǁĞƌŽƌǁĂƚĞƌƐƵƉƉůǇ

Diagnosis

Check point

ϭǆŚĂƵƐƚƚŚĞƌŵŝƐƚŽƌĨĂƵůƚ

(Refer to section 10-13)

sŝƐƵĂůŝŶƐƉĞĐƚŝŽŶ͗ĐŽŶŶĞĐƚŝŽŶͬďƌĞĂŬĂŐĞŽĨǁŝƌĞƐĂŶĚͬŽƌĚĞďƌŝƐŽŶ

thermistor.

ŚĞĐŬǀŽůƚĂŐĞͬƌĞƐŝƐƚĂŶĐĞďĞƚǁĞĞŶǁŚŝƚĞΘǁŚŝƚĞ͘
ZĞĨĞƌƚŽ^ĞĐƚŝŽŶϴ;ͿĨŽƌƉƌŽƉĞƌƌĂŶŐĞŽĨǀĂůƵĞƐ͘

<ϭ

Summary of Contents for 240 T-H3J

Page 1: ...A O Smith Water Products Company 500 Tennessee Waltz Parkway Ashland City TN 37015 Toll Free 1 877 737 2840 240 T H3J 340 T H3S and 540 T H3 Models On Demand Water Heater Service Manual TRGSM00713...

Page 2: ...T H3J 340 T H3S and 540 T H3 models Service Manial Ver 1 00 CONFIDENTIAL Table of Contents 6 Wiring diagram t Z Z K 13 Components diagrams 14 Parts list 15 Revisions 3 4 6 10 13 14 16 18 19 20 21 47 5...

Page 3: ...l 2 0 Propane 2 6 Natural 2 4 Propane 2 7 Natural 2 4 Propane 3 2 Natural 2 8 Propane 3 2 Natural 2 9 Min Propane 0 6 Natural 0 7 Propane 0 7 Natural 0 7 Propane 0 6 Natural 0 7 Propane 0 7 Natural 0...

Page 4: ...0 VAC 3 77 mm 120 VAC 6 7 8 174 mm Drain port Female 10 3 4 272mm 22 1 22 570 mm Condensate drain port 4 102 mm 2 5 8 68 mm Exhaust Intake Female 7 7 8 199 mm 7 1 2 189 mm 7 180 mm 4 101 mm 17 3 4 450...

Page 5: ...6 3 4 172 mm 7 7 8 199 mm Drain port 7 1 2 189 mm 10 3 4 272 mm 22 1 2 570 mm 120 VAC Condensate drain port 7 7 8 199 mm Condensate drain port 11 281 mm 1 2 13 mm 120 VAC 3 77 mm GAS 131 mm HOT 140 m...

Page 6: ...els Service Manial Ver 1 00 CONFIDENTIAL 3 Interior view 240 Indoor T H3J DV 340 Indoor T H3S DV 1 2 3 4 5 6 7 9 10 11 12 13 14 15 16 18 19 20 21 22 23 24 26 28 27 29 30 31 31 33 33 17 33 37 38 34 39...

Page 7: ...0 T H3 models Service Manial Ver 1 00 CONFIDENTIAL 240 Outdoor T H3J OS 340 Outdoor T H3S OS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 18 19 20 21 22 23 24 25 26 28 27 29 35 30 31 31 33 33 17 34 39 32 32...

Page 8: ...and 540 T H3 models Service Manial Ver 1 00 CONFIDENTIAL 540 Indoor T H3 DV 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 18 19 20 21 22 23 24 25 26 28 27 29 35 30 31 31 33 33 17 33 36 37 38 34 39 32 32 AC12...

Page 9: ...H3S and 540 T H3 models Service Manial Ver 1 00 CONFIDENTIAL 540 Outdoor T H3 OS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 18 19 20 21 22 23 24 25 26 28 27 29 35 30 31 31 33 33 17 36 34 39 32 32 REMOTE C...

Page 10: ...odel 319143 516 3 Computer board 701 319143 543 240 models T H3J models 319143 544 340 models T H3S models 319143 545 540 models T H3 models 4 711 319143 479 5 Gas valve assembly W 102 319143 515 NA m...

Page 11: ...Primary heat assembly models 401 319143 525 d d 319143 527 540 models T H3 models Outdoor models 319143 526 d d 319143 528 540 models T H3 models 17 Secondary heat assembly models 401 319143 525 d d...

Page 12: ...models 401 319143 525 d d 319143 527 540 models T H3 models Outdoor models 319143 526 d d 319143 528 540 models T H3 models 30 drain plug 411 319143 096 d 31 Pipe heater 414 319143 531 32 K 417 31914...

Page 13: ...own d s NOTICE HOT COLD GAS Hi limit switch Inlet drain Outlet thermistor Drain plug Main gas valve Gas solenoid valve 2 Igniter O H C F Flow adjustment valve with Flow sensor Gas solenoid valve 1 Gas...

Page 14: ...G LB BL O H C F BL Hi limit Switch BL Gas Propor Valve W R BL BL BL BL P BK BK W BK BK Outlet thermistor Inlet thermistor Surge box Hi limit switch for exhaust Exhaust thermistor W W W W BK W BL R BK...

Page 15: ...Y Thermostat BK O Ground Flame rod AFR rod BK W W BL R BK Temperature controller BK BK W D y D E Green LED Bank of Bypass Vavle R W BR Y BL Gas Propor Valve R Y O BL W FM IG Igniter rod P P exchanger...

Page 16: ...e 108 to 132 VAC B Purple Purple 108 to 132 VAC B1 Heater Yellow Yellow 108 to 132 VAC C Gas valves KD Ds 93 to 120 VDC during Green blue at COM SV1 93 to 120 VDC during Orange blue at COM SV2 93 to 1...

Page 17: ...ve White red 1 0 to 15 VDC during operation and H2 Flow sensor Red Black 4 0 to 5 5 VDC White Black 1 0 to 4 0 VDC pulse more than 18 Hz I Yellow AFR rod Between the AFR rod and the computer board D d...

Page 18: ...e k Temperature F 0 00 5 00 10 00 15 00 20 00 25 00 0 10 20 30 40 50 60 70 80 90 100 Resisitance k Temperature C Resisitance values at different temperatures Temperature F 32 41 50 59 68 77 86 95 104...

Page 19: ...Temperature C Z Resisitance values at different temperatures Temperature F 32 41 50 59 68 77 86 95 104 113 C 0 5 10 15 20 25 30 35 40 45 Resistance 30 04 24 12 19 50 15 87 13 00 10 71 8 87 7 39 6 19...

Page 20: ...OPEN FAV close s s K d W Ds K Z MV OFF s K GPV OFF s s K Faucet closes K Remove cause K K K z NO z NO NO z z NO z NO NO z z NO z NO 5sec later z z NO z NO z NO NO NO z FM speed Above 1 000rpm Below D...

Page 21: ...00 CONFIDENTIAL 10 Component specifications 10 5 Flame rod 10 6 AFR rod 10 9 Flow adjustment valve 10 10 Flow sensor 10 11 Bypass valve 10 12 Thermistors 10 14 Hi limit switch 10 16 K 10 18 Computer...

Page 22: ...Unit Part 101 Function d d combustion reaction Failure events h 3 Cracks on the burners Effects on the water heater if burners fails h h Error codes when the burners fails 101 111 121 991 Diagnostic s...

Page 23: ...in 102 Function d d d operation Failure events Effects on the water heater if the manifold fails d Z measures Error codes when the manifold fails 101 111 121 991 Diagnostic s Color Number of wires Blu...

Page 24: ...h Effects on the water heater if fan motor fails d 2 Failure to ignite or abnormal ignition h Error codes when the fan motor fails 101 111 121 611 991 Diagnostic s shortage s Color Number of wires Bl...

Page 25: ...Error codes when the fvalves fails 101 111 121 991 Diagnostic s motor initiates below Color Number of wires Ds s Check point C Blue Green SV1 s Blue Orange SV2 s Blue Red SV3 s White Red Proportional...

Page 26: ...s h Effects on the water heater if flame rod fails d d will display d d code will display Error codes when the flame rod fails 111 121 721 Diagnostic s Color Number of wires Orange Flame rod and the c...

Page 27: ...ater heater if AFR rod fails d d will display d d code will display d K Error codes when the AFR rod fails 101 391 991 Diagnostic s Color Number of wires Yellow AFR rod Between the AFR rod and the com...

Page 28: ...er if the heat exchanger fails t 3 Abnormal sounds during combustion Error codes when the heat exchanger fails N A Diagnostic s Color Number of wires N A Checkpoint N A Part Model 319143 525 EK198 240...

Page 29: ...exchanger d d d and 540 T H3 models have the P77 mark as shown below d s 15 461 mm 24 1 2 625 mm 11 282 mm P77 68A d d s 15 461 mm 24 1 2 625 mm 11 282 mm 77 68A 240 340 Outdoor T H3J T H3S OS 15 3 8...

Page 30: ...f the secondary heat exchanger fails t 3 Abnormal sounds during combustion Error codes when the secondary heat exchanger fails N A Diagnostic s Color Number of wires N A Checkpoint N A Part Model 3191...

Page 31: ...heat exchanger d d d and 540 T H3 models have the P77 mark as shown below d s 15 461 mm 24 1 2 625 mm 11 282 mm P77 68A d d s 15 461 mm 24 1 2 625 mm 11 282 mm 77 68A 240 340 Outdoor T H3J T H3S OS 15...

Page 32: ...nents d t Error codes when flow adjustment valve fails 651 only within Easy Link systems Diagnostic s Color Number of wires Black Red s Checkpoint J The flow adjustment valve is assembled with the flo...

Page 33: ...n Error codes when flow sensor fails 441 only within Easy Link systems Diagnostic s impeller Color Number of wires Red Black s Check point H2 White 85 Black 1 0 to 4 0 VDC pulse The flow sensor is ass...

Page 34: ...in heat Failure events t 2 The valve cannot modulate properly Effects on the water heater if bypass valve fails t components d Error codes when bypass valve fails N A Diagnostic s Color Number of wir...

Page 35: ...21 Inlet 331 Heat exchanger Diagnostic s thermistor Color Number of wires more resistance values Check point See the table below Black 12 Black Outlet Black 113 Black EKd Pictures are on the following...

Page 36: ...rs 240 T H3J and 340 T H3S models 0 00 5 00 10 00 15 00 20 00 25 00 20 40 60 80 100 120 140 160 180 200 220 Temperature F Resisitance k Resistance values of thermistors as a function of temperature Ou...

Page 37: ...t Part 718 Function D Failure events h Effects on the water heater if exhaust thermistor fails Error codes when exhaust thermistor fails 341 Direct Vent Indoor models only Diagnostic s impeller Color...

Page 38: ...111 or 121 error code will display Error codes when hi limit switch fails 111 121 The water heaters don t have the 141 error code that was used in our previous models This error code is now replaced...

Page 39: ...H3J 340 T H3S and 540 T H3 models Service Manial Ver 1 00 CONFIDENTIAL 10 14 Hi limit switch After the hi limit switch was working refer to the following procedure 1 T 2 K 3 Press the button on the hi...

Page 40: ...nts h Effects on the water heater if hi limit switch for exhaust fails h d process and the 941 error code will display Error codes when hi limit switch for exhaust fails 941 Direct Vent Indoor models...

Page 41: ...computer board and gas valves will sever shutting down the water heater instantly The 111 or 121 error code will display Failure events h heater Effects on the water heater if the overheat cutoff fus...

Page 42: ...f heater fails Ceramic heaters do not activate allowing water contained in the heat Error codes when heater fails N A Diagnostic s heaters table Color Number of wires Black Black 108 to 132 VAC Checkp...

Page 43: ...ls Unit Part 701 Function Failure events D Effects on the water heater if the computer board fails Error codes when the computer board fails 701 721 741 761 Diagnostic s computer board Color Number of...

Page 44: ...s to ignite at all times Effects on the water heater if the igniter fails d E wears down Error codes when igniter fails 111 121 Diagnostic s weak spark Color Number of wires Purple 7 Purple 7 108 to 1...

Page 45: ...temperature K E Effects on the water heater if freeze protection thermostat fails d KE components inside the water heater d Error codes when the freeze protection thermostat fails N A Diagnostic s be...

Page 46: ...by voltage higher than 680 V Failure events K Effects on the water heater if the surge box fails h unit The computer board can short out stopping all operations 2 The unit cannot operate because the...

Page 47: ...en white black A A1 A2 W 1 No voltage at the controller Normal 11 to 25 VDC between white black F Normal 11 to 25 VDC between white black W get hot water at the d d the distance or the bigger the pipe...

Page 48: ...d in use 3 Check the installation place installed 5 Check the vent length when the water heater has been installed indoors the water heater has been installed in laundry room water heater has been ins...

Page 49: ...unction description Cancellation method 031 W d Diagnosis Check point W W Error Code Malfunction description Cancellation method 101 t Z K W E d Diagnosis Check point 2 Check how long the water heater...

Page 50: ...19 s observed weak spark Normal gap 0 16 4mm W Normal 108 to 132 VAC at 7 purple purple during ignition B W E Ds Normal 93 to 120 VDC between COM blue 3 light blue during operation E s2 Normal 93 to...

Page 51: ...blue 3 light blue during operation E s2 Normal 93 to 120 VDC between COM blue 53 orange during operation E s 0 Normal 1 0 to 15 VDC between white red during operation C H1 D Ds E KD s2 E KD s 0 Norma...

Page 52: ...or Z Error Code Malfunction description Cancellation method 331 Only 540 T H3 models d Diagnosis Check point Refer to section 10 12 s thermistor Z Error Code Malfunction description Cancellation metho...

Page 53: ...eck point W Refer to section 10 4 10 18 s Normal 93 to 120 VDC between COM blue 9 green during operation Normal 93 to 120 VDC between COM blue 53 orange during operation Normal 93 to 120 VDC between C...

Page 54: ...method 661 K d d Diagnosis Check point W Refer to section 10 11 10 18 s Normal 3 0 to 11 VDC between brown red s W marks on the computer board J1 Error Code Malfunction description Cancellation method...

Page 55: ...estoring proper cable connections between the water heater and the Remote controller When the computerdetectsproperconnections between the water heater and the remote controller 741 error code will ce...

Page 56: ...computer detects proper connections among all the water heaters 761 error code will cease to display Diagnosis Check point W E s D1 and D2 Error Code Malfunction description Cancellation method 751 Mi...

Page 57: ...ater heater has been installed in laundry room system is recirculation Recirculation system with high temperature Error Code Malfunction description Cancellation method 991 Refer to section 12 3 d E m...

Page 58: ...s 12 1 Diagnosis using the temperature controller and temperature remote controller 59 12 2 s 63 12 3 Displaying error code history Clearing error code history memory and Display 64 65 Z 66 W 67 K d 7...

Page 59: ...Fig 2 TEMPERATURE CONTROLLER and TEMPERATU REREMOTE CONTROLLER d d COLD Button HOT Button W Kd K button to set the hot water temperature STANDBYLED Orange The indicator is ON to show that power is ON...

Page 60: ...linked together W INFO t HOT or COLD Fig 3 shows mode 6 is being selected t table on p 61 62 for the proper mode W INFO will display on the controller Fig 4 t ON OFF the display will return to normal...

Page 61: ...erational water heaters 0 to 4 units temperature 540 T H3 models only 6 Set temperature 100 to 185 F Outlet temperature 7 Operation time during current rotation 0 to 720 minutes rotation occurs Air Fu...

Page 62: ...formation 1 to 4 19 E Bypass valve position closed position 0 20 Z cold water 21 E 22 23 24 25 WZKD 26 proportional valve 0 to 999 mA 27 d combustion stages The water heater combustion E 28 E 29 compu...

Page 63: ...F switch d KE B Data backup function of the temperature remote controller 240 T H3J 340 T H3S models computer board Green LED 540 T H3 models computer board Green LED Power ON OFF switch Temperature c...

Page 64: ...code history Green LED Error Indication on the controller Green LED Error Indication on the controller Blinking one time 031 Blinking three times 111 121 701 611 711 651 Blinking two times 311 661 32...

Page 65: ...Manial Ver 1 00 CONFIDENTIAL 12 4 Clearing the 101 and 991 error code d t t t s d d E s d K Increase and Decrease d s W KE K d 240 T H3J 340 T H3S models computer board Decrease Increase Green LED 540...

Page 66: ...opane Natural gas Propane Natural gas Combustion mode D y 12 0 to 35 0 23 6 to 58 0 6 0 to 41 0 17 1 to 55 0 D E 5 0 to 20 0 3 5 to 11 0 3 0 to 15 0 3 8 to 19 0 340 T H3J models Installation type Dire...

Page 67: ...witch is for a specialized purposes only Disable DEFAULT No 3 OFF NO 4 OFF No 5 OFF OFF ON 1 2 3 4 5 6 7 8 9 10 240 T H3J 340 T H3S models W 240 T H3J and 340 T H3S models Computer board Vent settings...

Page 68: ...le 7 Changing the FM speed is similar to changing the manifold pressure See section 12 15 Disable 8 Disable The upper bank of DIPswitches 540 T H3 models 540 T H3 models computer board W h W Outdoor m...

Page 69: ...AL The lower bank of DIPswitches No Functions ON position OFF position 1 W Parent Child 2 3 4 D D FM speed is increased automatically See section 12 13 5 Output temperature settings 140 F 60 C 120 F 4...

Page 70: ...he numbering of units h Parent unit Child unit Child unit Child unit Operation Screen on the controller 1 Press and hold the Increase button on the computer the parent unit 2 d the parent unit 3 d the...

Page 71: ...rvice Manial Ver 1 00 CONFIDENTIAL 12 8 A ON OFF conditions Overview d KE K K ON OFF Conditions Conditions needed to turn ON d dh dh OR dh dh AND d WD OR d WD K C Conditions needed to turn OFF d dh dh...

Page 72: ...01 5 102 6 OFF 62 4 86 2 94 1 98 1 100 5 102 1 103 2 104 0 120 ON 60 5 90 2 100 2 105 1 108 1 110 1 111 5 112 6 OFF 72 4 96 2 104 1 108 1 110 5 112 1 113 2 114 0 130 ON 70 5 100 2 110 2 115 1 118 1 12...

Page 73: ...below d A In the case of reducing down from two units of 540 T H3 models to one unit of 540 d Flow rate A 1 7 B E Set temperature Factor A F C GPM 100 120 38 49 3 4 13 125 130 52 54 3 2 12 135 140 57...

Page 74: ...al Ver 1 00 CONFIDENTIAL 12 10 Operation time for unit rotation Only 540 T H3 models d d d KE K EKd d t h d Z A rotation occurs when KE K Unit No 1 Unit No 2 Unit No 3 Unit No 4 Priorty unit 1 2 3 4 P...

Page 75: ...anial Ver 1 00 CONFIDENTIAL 12 11 Individual unit operation in easy link system while parent unit is under abnormal conditions Individual operation mode Only 540 T H3 models d WD WD d Z D h WD t WD D...

Page 76: ...dels Previous models Case 1 Temperature remote controller 9007603005 dD Z Previous models Previous models 540 T H3 Previous models Case 2 Temperature remote controller 9007603005 dD Z Previous models...

Page 77: ...0 Although 520 T H2 can be connected with the temperature remote controller 9007603005 TM RE30 these cannot be connected with the temperature remote controller 9008172005 TM RE40 CAUTION F 100 105 110...

Page 78: ...e ON OFF button on the remote in order to 3 Press the INFO 4 temperature mode mode 5 6 Press the ON OFF button on the remote in order to turn the controller on 7 Press the HOT button or the COLD butto...

Page 79: ...d See the table below h d d W Level Elevation Output reduction Fan motor speed change DIPswitch settings No 3 No 4 No 5 0 h d E E OFF OFF OFF 1 h E OFF ON OFF 2 h ON ON OFF OFF OFF ON 3 h ON OFF ON OF...

Page 80: ...o 3 No 4 No 5 0 h d E E OFF OFF OFF 1 h E OFF ON OFF 2 h OFF OFF ON 3 h ON OFF ON 4 Consult our Technical Services Department E ON OFF OFF d E K d d E Level Elevation Output reduction Fan motor speed...

Page 81: ...ion Fan motor speed change DIPswitch settings No 2 No 3 No 4 0 h d E E OFF OFF OFF 1 h E OFF ON OFF 2 h ON ON OFF OFF OFF ON 3 h ON OFF ON OFF ON ON 4 h ON ON ON E ON OFF OFF d E Level Elevation Outpu...

Page 82: ...o 2 No 3 No 4 0 h d E E OFF OFF OFF 1 h E OFF ON OFF 2 h OFF OFF ON 3 h ON OFF ON 4 Consult our Technical Services Department E ON OFF OFF d E K d E Level Elevation Output reduction Fan motor speed ch...

Page 83: ...tton press either the Increase or Decrease Z desired value replace the port screw Adjusting minimum manifold pressure Z secure enough to prevent gas leak Z 5 Press and hold down the MIN t D E button p...

Page 84: ...nd 540 T H3 models Service Manial Ver 1 00 CONFIDENTIAL Fig 3 240 T H3J 340 T H3S models computer board D y D E Decrease button 540 T H3 models computer board D E D y Decrease button Fig 1 D Computer...

Page 85: ...r speed t W E d KE K Z Section 12 1 3 Press and hold down the MAX t D y button press either the Increase or Decrease Z desired value W E d K Adjusting minimum fan motor speed t W E d KE K Z Section 12...

Page 86: ...d d d d d d d d d d Automatic firing system K 540 Direct Vent Indoor T H3 DV d W E K s d s s d s d minutes have elapsed t d 32 F d To sum it up in a chart Case 5 minutes have elapsed since prior opera...

Page 87: ...87 Page 240 T H3J 340 T H3S and 540 T H3 models Service Manial Ver 1 00 CONFIDENTIAL Ceramic heating blocks d d d s K d below 36 5 F K above 46 4 F...

Page 88: ...CONFIDENTIAL 12 17 Draining and cleaning the inlet water filter d t d Unscrew the drain plugs to t 8 t 9 Securely screw the drain plugs back into place Hand tighten only 5 Open all hot water taps in t...

Page 89: ...er 1 00 CONFIDENTIAL 13 Components diagram Indoor models Outdoor models Case assembly 052 052 003 007 002 050 006 704 005 052 702 704 008 052 050 052 717 702 713 004 002 001 001 004 Temperature remote...

Page 90: ...1 00 CONFIDENTIAL Computer board assembly Surge box assembly 540 T H3 models 240 T H3J and 340 T H3S models 710 701 713 103 709 402 707 708 714 721 407 408 701 714 403 715 721 707 722 715 402 402 103...

Page 91: ...Manial Ver 1 00 CONFIDENTIAL Burner assembly 101 104 115 106 107 108 110 109 111 712 112 062 053 053 709 053 401 103 105 065 054 113 114 102 708 119 151 118 055 051 150 057 055 120 711 712 063 117 053...

Page 92: ...052 059 052 409 417 Water outlet section Water inlet section 403 456 460 458 462 B A Bypass section 540 T H3 models D A B E E 459 454 411 F 412 058 F 413 452 450 414 451 414 451 414 401 416 009 464 C...

Page 93: ...t 005 319143 510 006 319143 511 Power suuply code assembly 007 319143 512 Back guard panel 008 319143 513 009 319143 018 Condensate drain port 520 320 d s K d s K 050 319143 025 t D t t 051 319143 325...

Page 94: ...E d h E d h E 319143 043 K 910 710 520 320 310 510 h K h K h K d d W d W T M50 T M32 d s K d s K d E d E d h K d h K d h K 104 319143 031 y Burner gasket 520 320 110 310 510 d d W d W K d s K d s K d...

Page 95: ...d s K d E K d E K 110 319143 036 Rod holder 910 710 520 320 310 510 d d W d W K T M50 T M32 d s K d s K d E K d E K 111 319143 038 E Rod cap 910 710 520 320 110 310 510 d d W d W K T M50 T M32 d s K d...

Page 96: ...0 320 310 510 h h h d d W d W T M50 T M32 d s K d s K d E K d E K d h E K d h E K d h E K 117 319143 520 y Combustion chamber tube 910 310 510 T M50 d K T D2 OS 118 319143 455 Gas inlet h h h d h E K...

Page 97: ...d s 319143 528 K d K 402 319143 463 h h h d h E K d h E K d h E K 403 319143 464 d h d h E K 404 319143 193 h Water inlet 110 310 510 h h h d d W d W K d E K d E K d E K d h E K d h E K d h E K 405 31...

Page 98: ...d d W d W K T M50 d E K d E K d E K d h E K d h E K d h E K 411 319143 096 d d 910 710 520 320 510 h d d W T M50 T M32 d s K d s K d E K d h E K 412 319143 228 D d d 110 310 h h d E K d E K d h E K d...

Page 99: ...s K d s K d E K d E K d E K d h E K d h E K d h E K 451 319143 125 910 710 520 320 110 310 510 h h h T M50 T M32 d s K d s K d E K d E K d E K d h E K d h E K d h E K 452 319143 066 910 710 520 320 11...

Page 100: ...320 110 310 510 h h h d d W d W K T M50 T M32 d s K d s K d E K d E K d E K d h E K d h E K d h E K 456 319143 100 D K W D 520 320 110 310 510 h h h d d W d W K d s K d s K d E K d E K d E K d h E K d...

Page 101: ...320 110 310 510 h h h d d W d W K d s K d s K d E K d E K d E K d h E K d h E K d h E K 461 319143 226 D 110 310 510 h h h d d W d W K d E K d E K d E K d h E K d h E K d h E K 462 319143 205 510 h d...

Page 102: ...K 704 319143 427 s h h h d E d E d E d h E d h E d h E 319143 546 s K 706 319143 141 s 120 VAC Power ON OFF switch 520 320 110 310 510 h h h d W K d s K d s K d E K d E K d E K d h E K d h E K d h E...

Page 103: ...for other models 240 340 and 540 models T H3J T H3S and T H3 models 240 340 and 540 models T H3J T H3S and T H3 models 717 319143 500 y 718 319143 131 T H2 DV T H2S DV 719 319143 484 Z d h d h E K 721...

Page 104: ...104 Page 240 T H3J 340 T H3S and 540 T H3 models Service Manial Ver 1 00 CONFIDENTIAL 15 Revisions Version Date 1 00 First edition...

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A.O. Smith 240 T-H3J, Service Manual

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