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A.O. Smith 240 T-H3J Service Manual

Summary of 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: Table of Contents

    2 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential table of contents പϭ͘^ƉĞĐŝĨŝĐĂƚŝŽŶƐ͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘ പϮ͘džƚĞƌŝŽƌǀŝĞǁ͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘...

  • Page 3: 1. Specifications

    3 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 1. Specifications model 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) dimensions inch ,ϮϮ͘ϰdžtϭϳ͘ϳdžϭϬ͘ϳ ϱϳϬ;,ͿdžϰϱϬ;tͿdžϮϳϮ;...

  • Page 4: 2. Exterior View

    4 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 2. Exterior view direct vnet indoor models side view front view 7-7/8" (199 mm) gas 5-1/8" (131 mm) c old 6-3/4" (172 mm) ho t 5-1/2" (140 mm) 7-1/2" (189 mm) gas 5-7/8" (147 mm) condensate drain port cold 5/...

  • Page 5

    5 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential outdoor models side view front view 17-5/8" (448 mm) 6-1/4" (159 mm) cold 5/8" (17 mm) 120 v a c 3" (77 mm) ho t 5-1/2" (140 mm) hot 4-3/4" (120 mm) 7-1/2" (189 mm) condensate drain port gas 5-1/8" (131 mm) c...

  • Page 6: 3. Interior View

    6 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models 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 32 32 remo te c o ntr oller off on ac120v 8 ...

  • Page 7

    7 page 240 (t-h3j), 340 (t-h3s) and 540 (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 remo te c o ntr oller off on ac120v.

  • Page 8

    8 page 240 (t-h3j), 340 (t-h3s) 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 ac120v remo te c o ntr oller off on.

  • Page 9

    9 page 240 (t-h3j), 340 (t-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 remo te c o ntr oller ac120v off on.

  • Page 10

    10 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 4. List of main components in the interior view no. Description items# in components diagram part # 240, 340 and 540 models t-h3j, t-h3s and t-h3 models 1. Case assembly /ŶĚŽŽƌ models 001 eͬ outdoor models e...

  • Page 11

    11 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential no. Description items# in components diagram part # 240, 340 and 540 models t-h3j, t-h3s and t-h3 models 13. Fan motor /ŶĚŽŽƌ models 103 319143-443 outdoor models 319143-043 14. Freeze protection thermostat ...

  • Page 12

    12 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential no. Description items# in components diagram part # 240, 340 and 540 models t-h3j, t-h3s and t-h3 models 27. DĂŶŝĨŽůĚƉŽƌƚ eͬ eͬ eͬ 28. Gas inlet port eͬ eͬ eͬ 29. džŚĂƵƐƚ chamber /ŶĚŽŽƌ models /ŶĐůƵĚĞĚŝŶ #401...

  • Page 13: 5. Schematic Diagram

    13 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 5. Schematic diagram dŚĞĚŝĂŐƌĂŵďĞůŽǁƌĞĨĞƌƐƚŽďŽƚŚƚŚĞŝƌĞĐƚsĞŶƚ/ŶĚŽŽƌŵŽĚĞůƐĂŶĚkƵƚĚŽŽƌŵŽĚĞůƐ͘ 1. When a hot water tap is opened, cold water enters the water heater. Ϯ͘dŚĞǁĂƚĞƌĨůŽǁƐĞŶƐŽƌĚĞƚĞĐƚƐƚŚŝƐǁĂƚĞƌĨůŽǁĂŶĚƐĞŶ...

  • Page 14: 6. Wiring Diagram

    14 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 6. Wiring diagram w: white r: red bk: black p: purple lb: light blue bl: blue g: green y: yellow o: orange br: brown 240 (t-h3j) models / 340 (t-h3s) models 9 8 7 6 5 4 3 2 1 10 off temperature remote contro...

  • Page 15

    15 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 540 (t-h3) models w: white r: red bk: black p: purple lb: light blue bl: blue g: green y: yellow o: orange br: brown 8 7 6 5 4 3 2 1 on 6 5 4 3 2 1 on r w g y pcb w 120 vac g ground sw ground bk w g bk w sur...

  • Page 16

    16 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 7. Wiring diagram check points for diagnosis dŚĞƚĂďůĞďĞůŽǁĂƉƉůŝĞƐƚŽďŽƚŚƚŚĞƚŚĞŝƌĞĐƚsĞŶƚ/ŶĚŽŽƌŵŽĚĞůƐĂŶĚkƵƚĚŽŽƌŵŽĚĞůƐ͘ check- point part and description color of wires normal range a 120v power supply white – b...

  • Page 17

    17 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential check- point part and description color of wires normal range f remote controller white – black 11 to 25 vdc g fan motor red - blue 132 to 192 vdc yellow - blue 13 to 17 vdc orange - blue 2.0 to 6.5 vdc h1 g...

  • Page 18

    18 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 8. (a) resistance values of the temperature thermistors dŚĞƚŚĞŝƌĞĐƚsĞŶƚ/ŶĚŽŽƌŵŽĚĞůƐĂŶĚkƵƚĚŽŽƌŵŽĚĞůƐƵƐĞƚŚĞƐĂŵĞƚŚĞƌŵŝƐƚŽƌƐ͘ temperature (°f ͿǀƐzĞƐŝƐŝƚĂŶĐĞ;Ŭɏ) temperature (°c ͿǀƐzĞƐŝƐŝƚĂŶĐĞ;Ŭɏ) 0.00 5.00 10.00...

  • Page 19

    19 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 8. (b) resistance values of the temperature exhaust thermistor kŶůLJƚŚĞŝƌĞĐƚsĞŶƚ/ŶĚŽŽƌŵŽĚĞůƐĂƌĞĞƋƵŝƉƉĞĚǁŝƚŚƚŚĞĞdžŚĂƵƐƚƚŚĞƌŵŝƐƚŽƌ͘ temperature (°f ͿǀƐzĞƐŝƐŝƚĂŶĐĞ;Ŭɏ) temperature (°c ͿǀƐzĞƐŝƐŝƚĂŶĐĞ;Ŭɏ) resisitan...

  • Page 20: 9. Operational Flow Chart

    20 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 9. Operational flow chart dŚĞĚŝĂŐƌĂŵďĞůŽǁƌĞĨĞƌƐƚŽďŽƚŚƚŚĞŝƌĞĐƚsĞŶƚ/ŶĚŽŽƌŵŽĚĞůƐĂŶĚkƵƚĚŽŽƌŵŽĚĞůƐ͘ power supply on kƉĞƌĂƟŽŶ^tke &sΘsŽƉĞŶ pre-check normal? &ĂƵĐĞƚŽƉĞŶƐ tĂƚĞƌ&ůŽǁ above 0.5gpm? Fm speed (below 1,00...

  • Page 21: 10. Component Specifications

    21 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10. Component specifications പϭϬͲϭ͘ƵƌŶĞƌƐ͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘ പϭϬͲϮ͘'ĂƐŵĂŶŝĨŽůĚ͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘͘...

  • Page 22: 10-1. Burners

    22 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10-1. Burners part # ͻഩϯϭϵϭϰϯͲϱϭϰ; unit part# #101 function dŚĞƌĞ ĂƌĞ Ϯ ƚLJƉĞƐ ŽĨ ďƵƌŶĞƌƐ ŝŶ ƚŚĞ ďƵƌŶĞƌ ĂƐƐĞŵďůLJ͗ ƚŚĞ ŐĂƐͲƌŝĐŚ ďƵƌŶĞƌ ƐƚĂďŝůŝnjĞƐƚŚĞĨůĂŵĞƐǁŝƚŚŝŶƚŚĞĐŽŵďƵƐƚŝŽŶĐŚĂŵďĞƌĂŶĚƚŚĞĂŝƌͲƌŝĐŚďƵƌŶĞƌ ƉƌŽĚƵĐĞƐ...

  • Page 23: 10-2. Gas Manifold

    23 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10-2. Gas manifold part # ͻഩϯϭϵϭϰϯͲϱϭϱ; ͻഩϯϭϵϭϰϯͲϱϭϲ; unit part# included in #102 function ϭ͘dŚĞŵĂŶŝĨŽůĚĚŝƐƚƌŝďƵƚĞƐŐĂƐĨƌŽŵƚŚĞŐĂƐǀĂůǀĞƐƚŽƚŚĞďƵƌŶĞƌƐ͘dŚĞ ŵĂŶŝĨŽůĚŚĂƐƚǁŽƚLJƉĞƐŽĨƚŚĞŶŽnjnjůĞƐ͗ŽŶĞƚLJƉĞĨŽƌŐĂƐͲƌŝĐŚďƵƌŶĞƌ...

  • Page 24: 10-3. Fan Motor

    24 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10-3. Fan motor part # ͻഩϯϭϵϭϰϯͲϰϰϯ; ͻഩϯϭϵϭϰϯͲϬϰϯ; unit part# #103 function dŽ ƉƌŽǀŝĚĞ ĐŽŵďƵƐƚŝŽŶ Ăŝƌ ŝŶƚŽ ƚŚĞ ĐŽŵďƵƐƚŝŽŶ ĐŚĂŵďĞƌ ĂŶĚ ƚŽ ĞdžŚĂƵƐƚ ĨůƵĞŐĂƐ͘ failure events ϭ͘&ĂŶƐƉĞĞĚĨĂŝůƵƌĞ͕ĐĂƵƐŝŶŐĂďŶŽƌŵĂůƐŽƵŶĚ...

  • Page 25: 10-4. Gas Valve Assembly

    25 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10-4. Gas valve assembly part# ͻഩϯϭϵϭϰϯͲϱϭϱ; ͻഩϯϭϵϭϰϯͲϱϭϲ; unit part# included in #102 function kƉĞŶƐĂŶĚĐůŽƐĞƐƚŚĞŐĂƐƉĂƚŚǁĂLJƐŽĨƚŚĞǁĂƚĞƌŚĞĂƚĞƌ;ŵĂŝŶĂŶĚƐŽůĞŶŽŝĚ gas valves) dŽĚƵůĂƚĞƐƚŚĞŐĂƐĨůŽǁĨƌŽŵƚŚĞŐĂƐŝŶůĞƚ;ƉƌŽ...

  • Page 26: 10-5. Flame Rod

    26 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10-5. Flame rod part # ͻഩϯϭϵϭϰϯͲϱϭϳ; unit part# #108 function dŽĚĞƚĞĐƚĨůĂŵĞƐǁŚŝůĞƚŚĞǁĂƚĞƌŚĞĂƚĞƌŝƐŝŶŽƉĞƌĂƚŝŽŶ͘ failure events ϭ͘hŶĂďůĞƚŽĚĞƚĞĐƚĨůĂŵĞƐǁŚĞŶĨůĂŵĞƐĂĐƚƵĂůůLJĚŽŽĐĐƵƌ͘ Ϯ͘ĞƚĞĐƚŝŶŐĂĨĂůƐĞĨůĂŵĞǁŚĞŶŶŽĨůĂŵĞƐ...

  • Page 27: 10-6. Afr Rod

    27 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10-6. Afr rod part # ͻഩϯϭϵϭϰϯͲϱϭϳ; unit part# #108 function ŚĞĐŬƐĨůĂŵĞĐŽŶĚŝƚŝŽŶƐĚƵƌŝŶŐĐŽŵďƵƐƚŝŽŶ͘ tŚĞŶ&zƌŽĚĚĞƚĞĐƚƐƵŶĞdžƉĞĐƚĞĚĨůĂŵĞĐŽŶĚŝƚŝŽŶƐ͕ƚŚĞĐŽŵƉƵƚĞƌŽĨƚŚĞ ǁĂƚĞƌŚĞĂƚĞƌŵĂŬĞƐĂĚũƵƐƚŵĞŶƚƐŝŶƚŚĞĨĂŶŵŽƚŽƌƐƉĞĞĚƚŽĐŽŵ...

  • Page 28: 10-7. Heat Exchanger

    28 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10-7. Heat exchanger part# *see the table below unit part# #401 function ďƐŽƌďƐ ŚĞĂƚ ĨƌŽŵ ĐŽŵďƵƐƚŝŽŶ ĂŶĚ ƚƌĂŶƐĨĞƌ ŝƚ ƚŽ ǁĂƚĞƌ ƚŚƌŽƵŐŚ ƚŚĞ ŚĞĂƚ ĞdžĐŚĂŶŐĞƌƉŝƉĞƐ͘ failure events ϭ͘ůŽŐŐĞĚŚĞĂƚĞdžĐŚĂŶŐĞƌĨŝŶƐĂŶĚͬŽƌĐƌ...

  • Page 29: 10-7. Heat Exchanger

    29 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10-7. Heat exchanger dŚĞŚĞĂƚĞdžĐŚĂŶŐĞƌŽĨƚŚĞϮϰϬ;dͲ,ϯ:ͿĂŶĚϯϰϬ;dͲ,ϯ^ͿŵŽĚĞůƐŚĂǀĞƚŚĞ͞ϳϳ͟ŵĂƌŬ͕ and 540 (t-h3) models have the "p77" mark as shown below. ϱϰϬ/ŶĚŽŽƌ;dͲ,ϯͲsͿ 15" (461 mm) 24-1/2" (625 mm) 11" (282 mm) ...

  • Page 30

    30 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10-8. Secondary heat exchanger part# *see the table below unit part# #401 function ďƐŽƌď ůĂƚĞŶƚ ŚĞĂƚ ĨƌŽŵ ĞdžŚĂƵƐƚ ŐĂƐ ĂŶĚ ƚƌĂŶƐĨĞƌ ƚŚĞ ǁĂƚĞƌ ƚŚƌŽƵŐŚ ƚŚĞ ƐĞĐŽŶĚĂƌLJŚĞĂƚĞdžĐŚĂŶŐĞƌƉŝƉĞƐ͕ǁŚŝĐŚĐĂŶŝŵƉƌŽǀĞŚĞĂƚĞĨĨŝĐŝĞ...

  • Page 31

    31 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10-8. Secondary heat exchanger dŚĞŚĞĂƚĞdžĐŚĂŶŐĞƌŽĨƚŚĞϮϰϬ;dͲ,ϯ:ͿĂŶĚϯϰϬ;dͲ,ϯ^ͿŵŽĚĞůƐŚĂǀĞƚŚĞ͞ϳϳ͟ŵĂƌŬ͕ and 540 (t-h3) models have the "p77" mark as shown below. ϱϰϬ/ŶĚŽŽƌ;dͲ,ϯͲsͿ 15" (461 mm) 24-1/2" (625 mm) 11"...

  • Page 32: 10-9. Flow Adjustment Valve

    32 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10-9. Flow adjustment valve part# ͻഩϯϭϵϭϰϯͲϰϲϯ; unit part# #402 function ŽŶƚƌŽůƐǁĂƚĞƌĨůŽǁƚŽƉƌŽƉĞƌůLJĐŽŶƚƌŽůƚŚĞŽƵƚƉƵƚŚŽƚǁĂƚĞƌƚĞŵƉĞƌĂƚƵƌĞ͘ failure events ϭ͘tĂƚĞƌůĞĂŬĂŐĞĨƌŽŵǀĂůǀĞ͘ Ϯ͘dŚĞǀĂůǀĞĐĂŶŶŽƚŵŽĚƵůĂƚĞŽƌŵĂŬĞŽ...

  • Page 33: 10-10. Flow Sensor

    33 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10-10. Flow sensor part# ͻഩϯϭϵϭϰϯͲϰϲϯ; unit part# #402 function ĞƚĞĐƚƐ ĂŶĚ ŵĞĂƐƵƌĞƐ ǁĂƚĞƌ ĨůŽǁ ƌĂƚĞ ƵƐŝŶŐ Ă ƐƉŝŶŶŝŶŐ ŝŵƉĞůůĞƌ ĂŶĚ magnetic pick-up. Failure events hŶĂďůĞƚŽĚĞƚĞĐƚŽƌŵĞĂƐƵƌĞĂŶLJǁĂƚĞƌĨůŽǁƌĂƚĞ͘ eff...

  • Page 34

    34 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10-11. Bypass valve (540 (t-h3) models only) part # ͻഩϯϭϵϭϰϯͲϰϲϰ; 540 (t-h3) models only unit part# #403 function ϭ͘dŝdžĞƐŚŽƚǁĂƚĞƌĨƌŽŵƚŚĞŚĞĂƚĞdžĐŚĂŶŐĞƌǁŝƚŚĐŽůĚǁĂƚĞƌĨƌŽŵƚŚĞǁĂƚĞƌ inlet in order to modulate and c...

  • Page 35: 10-12. Thermistors

    35 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10-12. Thermistors part # *see the table below unit part# #407 (inlet) #408 (outlet ) #411 (heat exchanger) function dĞĂƐƵƌĞƐĐŽůĚͬŚŽƚǁĂƚĞƌƚĞŵƉĞƌĂƚƵƌĞƐŝŶƚŚĞǁĂƚĞƌŚĞĂƚĞƌ͘ failure events hŶĂďůĞƚŽƉƌŽƉĞƌůLJŵĞĂƐƵƌĞǁ...

  • Page 36: 10-12. Thermistors

    36 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10-12. Thermistors 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 / ºf resisitance / k ȍ resistance values of thermistors as a functi...

  • Page 37: 10-13. Exhaust Thermistor

    37 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10-13. Exhaust thermistor part# ͻഩϯϭϵϭϰϯͲϭϯϭ; unit part# #718 function dĞĂƐƵƌĞƐƚŚĞĞdžŚĂƵƐƚƚĞŵƉĞƌĂƚƵƌĞƐŝŶƚŚĞƐĞĐŽŶĚĂƌLJŚĞĂƚĞdžĐŚĂŶŐĞƌ͘ failure events hŶĂďůĞƚŽŵĞĂƐƵƌĞĞdžŚĂƵƐƚƚĞŵƉĞƌĂƚƵƌĞŝŶƚŚĞĞdžŚĂƵƐƚĐŚĂŵďĞƌƉƌŽƉĞƌůLJ͘ ...

  • Page 38: 10-14. Hi-Limit Switch

    38 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10-14. Hi-limit switch part# ͻഩϯϭϵϭϰϯͲϮϮϴ;dϮϭϮͿ 240 (t-h3j) /340 (t-h3s) models ͻഩϯϭϵϭϰϯͲϬϵϱ; 540 (t-h3) models unit part# #412 function ͲĂƐĞĚŽŶďŝͲŵĞƚĂůƚŚĞƌŵĂůĞdžƉĂŶƐŝŽŶ͘ ͲĞƚĞĐƚƐĞdžĐĞƐƐŝǀĞůLJŚŝŐŚǁĂƚĞƌƚĞŵƉĞƌĂƚƵƌ...

  • Page 39: 10-14. Hi-Limit Switch

    39 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10-14. Hi-limit switch ĞĨŽƌĞƉƌĞƐƐŝŶŐƚŚĞďƵƚƚŽŶŽŶƚŚĞŚŝͲůŝŵŝƚƐǁŝƚĐŚ͘ after the hi-limit switch was working, refer to the following procedure. 1. T ƵƌŶŽĨĨƚŚĞĐŽŶƚƌŽůůĞƌ. 2. KƉĞŶĂŚŽƚǁĂƚĞƌƚĂƉĂŶĚůŽǁĞƌƚŚĞƚĞŵƉĞƌĂƚƵƌĞŽ...

  • Page 40

    40 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10-15. Hi-limit switch for exhaust part# ͻഩϯϭϵϭϰϯͲϭϬϰ; unit part# #472 function ͲĂƐĞĚŽŶďŝͲŵĞƚĂůƚŚĞƌŵĂůĞdžƉĂŶƐŝŽŶ͘ ͲĞƚĞĐƚƐ ĞdžĐĞƐƐ ƚĞŵƉĞƌĂƚƵƌĞ ;ŵŽƌĞ ƚŚĂŶ ϭϱϭȗ& Žƌ ϲϲȗͿ ŽĨ ĞdžŚĂƵƐƚ ŐĂƐ ŝŶ ƚŚĞĞdžŚĂƵƐƚĐŚĂŵďĞƌ͘ failu...

  • Page 41: 10-16. Overheat Cut Off Fuse

    41 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10-16. Overheat cut off fuse part# ͻഩϯϭϵϭϰϯͲϭϰϵ; unit part# #413 function ͲdŚĞŽǀĞƌŚĞĂƚĐƵƚŽĨĨĨƵƐĞĐŽŶƚĂŝŶƐƐŽůĚĞƌǁŝƚŚĂŵĞůƚŝŶŐƉŽŝŶƚŽĨϰϯϬȗ& ;ϮϮϭȗͿ͘ ͲĞƚĞĐƚƐĞdžĐĞƐƐŝǀĞƚĞŵƉĞƌĂƚƵƌĞƐǁŝƚŚŝŶƚŚĞǁĂƚĞƌŚĞĂƚĞƌ͕ĞƐƉĞĐŝĂůůLJ ĂƌŽƵ...

  • Page 42

    42 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10-17. Freeze protection heaters part# ͻഩϯϭϵϭϰϯͲϱϯϭ; ͻഩϯϭϵϭϰϯͲϱϯϮ; ͻഩϯϭϵϭϰϯͲϱϯϯ; ͻഩϯϭϵϭϰϯͲϰϲϴ; ͻഩϯϭϵϭϰϯͲϱϯϱ; unit part# #414 #415 #417 #464 function wƌĞǀĞŶƚƐƚŚĞŚĞĂƚĞdžĐŚĂŶŐĞƌ͕ǁĂƚĞƌǀĂůǀĞƐ͕ĂŶĚǁĂƚĞƌƉŝƉĞƐǁŝƚŚŝŶƚŚ...

  • Page 43: 10-18. Computer Board

    43 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10-18. Computer board part# ͻഩϯϭϵϭϰϯͲϱϰϯ;240 (t-h3j) models ͻഩϯϭϵϭϰϯͲϱϰϰ;340 (t-h3s) models ͻഩϯϭϵϭϰϯͲϱϰϱ;540 (t-h3) models unit part# #701 function ŽŶƚƌŽůƐƚŚĞĨƵŶĐƚŝŽŶƐŽĨŵŽƐƚŽĨƚŚĞƉĂƌƚƐŝŶƚŚĞǁĂƚĞƌŚĞĂƚĞƌ͘ failur...

  • Page 44: 10-19. Igniter

    44 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10-19. Igniter part # ͻഩϯϭϵϭϰϯͲϰϳϵ; unit part# #711 function ͲdŽŝŐŶŝƚĞƚŚĞŐĂƐͬĂŝƌŵŝdžƚƵƌĞƐǁŚĞŶƚŚĞǁĂƚĞƌŚĞĂƚĞƌŝƐƌĞĂĚLJƚŽďƵƌŶŐĂƐ ŽŶŝƚƐďƵƌŶĞƌƐƵƌĨĂĐĞ͘ ͲdŚĞŽƵƚƉƵƚǀŽůƚĂŐĞŽĨƚŚĞŝŐŶŝƚĞƌŝƐŵŽƌĞƚŚĂŶϭϰŬs͘ failure events ϭ͘hŶ...

  • Page 45

    45 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10-20. Freeze protection thermostat part# ͻഩϯϭϵϭϰϯͲϰϵϲ; ͻഩϯϭϵϭϰϯͲϰϵϳ; unit part# #713 function temperature detecting device which prevents the pipes within the water ŚĞĂƚĞƌĨƌŽŵĨƌĞĞnjŝŶŐ͘tŚĞŶƚŚŝƐĚĞǀŝĐĞĚĞƚĞĐƚƐƚ...

  • Page 46: 10-21. Surge Box

    46 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 10-21. Surge box part# ͻഩϯϭϵϭϰϯͲϱϮϮ (ek163) unit part# #121 function wƌŽƚĞĐƚƐƚŚĞƵŶŝƚĨƌŽŵŚŝŐŚǀŽůƚĂŐĞĂŶĚͬŽƌŚŝŐŚĞůĞĐƚƌŝĐĐƵƌƌĞŶƚĐĂƵƐĞĚďLJ lightning. DŚĞƌĞĂƌĞϮƚLJƉĞƐŽĨƐƵƌŐĞĂďƐŽƌďĞƌƐŝŶƚŚĞǁĂƚĞƌŚĞĂƚĞƌ͘^ƵƌŐĞĂďƐŽƌďĞƌ a ...

  • Page 47

    47 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 11. Fault analysis & specifications remarks: ϭ͘wƌŽƉĞƌƌĂŶŐĞŽĨǀĂůƵĞƐŽĨǀŽůƚĂŐĞΘƌĞƐŝƐƚĂŶĐĞƐŚŽǁŶďĞůŽǁ͘ Ϯ͘wůĞĂƐĞƌĞĨĞƌƚŽƚŚĞǁŝƌŝŶŐĚŝĂŐƌĂŵĨŽƌĐŚĞĐŬƉŽŝŶƚƉŽƐŝƚŝŽŶƐ͘ ϯ͘zĞŵŽǀĞƉŽǁĞƌƚŽƚŚĞǁĂƚĞƌŚĞĂƚĞƌǁŚĞŶĐŚĞĐŬŝŶŐĨŽƌĐŽŶƚŝŶƵŝƚLJ...

  • Page 48

    48 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential natural of fault diagnosis check point ͻdŚĞŚŽƚǁĂƚĞƌƚƵƌŶƐ cold and stays cold ϭŚĞĐŬǁŚĞƚŚĞƌƚŚĞĨůŽǁƌĂƚĞŝƐŚŝŐŚĞŶŽƵŐŚƚŽŬĞĞƉƚŚĞǁĂƚĞƌŚĞĂƚĞƌ running. ϮŚĞĐŬŝĨƚŚĞƌĞŝƐĂƌĞĐŝƌĐƵůĂƚŝŽŶƐLJƐƚĞŵŝŶƐƚĂůůĞĚĂŶĚĐŚĞĐŬĂůƐŽŝĨƚŚĞ reci...

  • Page 49

    49 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential natural of fault diagnosis check point ͻ&ůƵĐƚƵĂƚŝŽŶŽĨŚŽƚ water temperature ϲ&ĂƵůƚŽĨwŝŶƚŚĞǁĂƚĞƌŚĞĂƚĞƌ eŽǀŽůƚĂŐĞĨůŽǁĂĚũƵƐƚŵĞŶƚǀĂůǀĞ normal: 7.0 to 16 vdc between (red-black) j ϳ&ůŽǁĂĚũƵƐƚŵĞŶƚǀĂůǀĞĨĂƵůƚ eŽƌŵĂů͗...

  • Page 50

    50 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential error code malfunction description cancellation method 111 ƌƌŽƌĐŽĚĞŝƐƐŚŽǁŶ ĂĨƚĞƌƚŚƌĞĞĨĂŝůĞĚ attempts at ignition /ŐŶŝƚŝŽŶĨĂŝůƵƌĞ dƵƌŶŽĨĨƚŚĞƉŽǁĞƌŽƌǁĂƚĞƌƐƵƉƉůLJ diagnosis check point 1 check gas supply and inle...

  • Page 51

    51 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential error code malfunction description cancellation method 121 ƌƌŽƌĐŽĚĞŝƐƐŚŽǁŶ ĂĨƚĞƌƚŚƌĞĞĨĂŝůĞĚ attempts at ignition >ŽƐƐŽĨĨůĂŵĞ dƵƌŶŽĨĨƚŚĞƉŽǁĞƌŽƌǁĂƚĞƌƐƵƉƉůLJ diagnosis check point 1 check gas supply and pressure...

  • Page 52

    52 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) sŝƐƵĂůŝŶ...

  • Page 53

    53 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential error code malfunction description cancellation method 441 &ůŽǁƐĞŶƐŽƌĨĂŝůƵƌĞ;kŶůLJĂƐLJͲůŝŶŬƐLJƐƚĞŵͿ dƵƌŶŽĨĨƚŚĞƉŽǁĞƌŽƌǁĂƚĞƌƐƵƉƉůLJ diagnosis check point ϭ&ůŽǁƐĞŶƐŽƌĨĂƵůƚ(refer to section 10-10) sŝƐƵĂůŝŶƐƉĞĐƚŝŽŶ͗Đ...

  • Page 54

    54 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential error code malfunction description cancellation method 651 &ůŽǁĂĚũƵƐƚŵĞŶƚǀĂůǀĞĨĂƵůƚ ;kŶůLJĂƐLJͲůŝŶŬƐLJƐƚĞŵͿ dƵƌŶŽĨĨƚŚĞƉŽǁĞƌŽƌǁĂƚĞƌƐƵƉƉůLJ diagnosis check point ϭwĂŶĚĨůŽǁĂĚũƵƐƚŵĞŶƚǀĂůǀĞĨĂƵůƚ (refer to section 10-...

  • Page 55

    55 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential error code malfunction description cancellation method 721 &ĂůƐĞĨůĂŵĞĚĞƚĞĐƚŝŽŶ dƵƌŶŽĨĨƚŚĞƉŽǁĞƌŽƌǁĂƚĞƌƐƵƉƉůLJ diagnosis check point ϭ&ĂůƐĞĨůĂŵĞĚĞƚĞĐƚŝŽŶ;ϱƐĞĐ͘Ϳ ϮŚĞĐŬĨŽƌĚĂŵƉŽĨĨůĂŵĞƌŽĚ͘ / error code malfunction ...

  • Page 56

    56 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential error code malfunction description cancellation method 761 miscommunication between parent and child ƵŶŝƚƐĨŽƌĂƐLJͲ>ŝŶŬƐLJƐƚĞŵƐ restoring proper cable connections among all the water heaters. When the computer ...

  • Page 57

    57 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential error code malfunction description cancellation method 941 ďŶŽƌŵĂůĞdžŚĂƵƐƚƚĞŵƉĞƌĂƚƵƌĞ ;ŝƌĞĐƚsĞŶƚ/ŶĚŽŽƌŵŽĚĞůƐŽŶůLJͿ dƵƌŶŽĨĨƚŚĞƉŽǁĞƌŽƌǁĂƚĞƌƐƵƉƉůLJ diagnosis check point 1 check how long the water heater has been ...

  • Page 58: 12. Controls and Settings

    58 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 12. Controls and settings 12-1. Diagnosis using the temperature controller and temperature remote controller..........59 12-2. SĞƌŝĨLJŝŶŐĨƵŶĐƟŽŶĂůŝƚLJŽĨĐŽŵƉƵƚĞƌďŽĂƌĚ...............................................

  • Page 59

    59 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 12-1. Diagnosis using the temperature controller and temperature remote controller പ 1. Press the "hot"ďƵƩŽŶĂŶĚƚŚĞ"cold"ďƵƩŽŶƐŝŵƵůƚĂŶĞŽƵƐůLJĨŽƌĂƚůĞĂƐƚϱƐĞĐŽŶĚƐƚŽĞŶƚĞƌ ͞ŝĂŐŶŽƐƟĐŵŽĚĞ͘͟ പϮ͘^ĐƌŽůůƵƉŽƌĚŽǁŶƚŽƚŚĞŶĞĞĚ...

  • Page 60

    60 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential ф&ŽƌŵƵůƟƉůĞƵŶŝƚƐŝŶĂŶĂƐLJͲ>ŝŶŬƐLJƐƚĞŵх പ 1. Press and hold the "hot" and "cold" ďƵƩŽŶƐƐŝŵƵůƚĂŶĞŽƵƐůLJĨŽƌĂƚůĞĂƐƚϱƐĞĐŽŶĚƐƚŽĞŶƚĞƌ ͞ŝĂŐŶŽƐƟĐƐdŽĚĞ͘͟ പϮ͘ΗϬΗǁŝůůďĞĚŝƐƉůĂLJĞĚŽŶƚŚĞĐŽŶƚƌŽůůĞƌ͘;^ĞĞ&ŝŐ͘ϭͿ പϯ͘^ĐƌŽůůƚŽƚŚĞĚĞƐŝƌ...

  • Page 61

    61 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential mode # whole multi-unit system information (#0) unit information (#1 to #4) 1 dŽƚĂůƐLJƐƚĞŵĨůŽǁƌĂƚĞ 0 to 999 (gpm) total operation time ϬƚŽϵϵϵ;džϭϬϬŚŽƵƌƐͿ 2 dhƌĞƋƵŝƌĞŵĞŶƚĨŽƌ the multi-system 0 to 999 ( пŬdhͬŚͿ ...

  • Page 62

    62 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential mode # whole multi-unit system information (#0) unit information (#1 to #4) 19 eͬ bypass valve position** ϬƚŽϵϵϵ;džϭϬƐƚĞƉƐͿ closed position = 0 20 zĂƚŝŽŽĨŚŽƚǁĂƚĞƌĂŶĚ cold water** ϬƚŽϵϵϵ;йͿ 21 eͬ 22 23 24 25 w...

  • Page 63

    63 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 12-2. Verifying functionality of computer board a. How to check if the computer board works properly 1. Check the power on-off switch ŽĨƚŚĞǁĂƚĞƌŚĞĂƚĞƌ͘ dŚĞĨĂĐƚŽƌLJƐĞƫŶŐŝƐkeƉŽƐŝƟŽŶ͘ ϯ͘ /ĨƚŚĞĐŽŵƉƵƚĞƌďŽĂƌĚǁŽƌŬƐƉ...

  • Page 64

    64 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 12-3. Displaying error code history, clearing error code history memory and display patterns for error codes displaying error code history green led error indication on the controller green led error indicat...

  • Page 65

    65 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 12-4. Clearing the “101” and “991” error code dŚĞ͞ϭϬϭ͟ĂŶĚ͞ϵϵϭ͟ĞƌƌŽƌĐŽĚĞƐƐŝŐŶŝĨLJŝŵƉĞƌĨĞĐƚ;ĂďŶŽƌŵĂůͿĐŽŵďƵƐƟŽŶ͕ĐĂƵƐĞĚďLJŝŶƐƵĸĐŝĞŶƚŝŶƚĂŬĞ ĂŝƌĂŶĚͬŽƌŽďƐƚƌƵĐƟŽŶƐŝŶƚŚĞĞdžŚĂƵƐƚ͘ ͘/ĨƚŚĞ͞ϭϬϭ͟ĂŶĚ͞ϵϵϭ͟ĞƌƌŽƌĐŽĚĞŽĐĐƵƌƐ͕ƉůĞĂƐ...

  • Page 66: 12-5. Afr Rod Function

    66 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 12-5. Afr rod function ф&ƵŶĐƟŽŶх dŚĞ&zƌŽĚĐŚĞĐŬƐŇĂŵĞĐŽŶĚŝƟŽŶƐĚƵƌŝŶŐĐŽŵďƵƐƟŽŶ͘tŚĞŶƚŚĞ&zƌŽĚĚĞƚĞĐƚƐƵŶĞdžƉĞĐƚĞĚŇĂŵĞ ĐŽŶĚŝƟŽŶƐ͕ƚŚĞĐŽŵƉƵƚĞƌďŽĂƌĚŽĨƚŚĞǁĂƚĞƌŚĞĂƚĞƌĂĚũƵƐƚƐƚŚĞĨĂŶŵŽƚŽƌƐƉĞĞĚƚŽĞŶƐƵƌĞƚŚĂƚĂŝƌĂŶĚ ĨƵĞůĂƌĞĂůǁĂLJƐ...

  • Page 67: 12-6. Dipswitch Settings

    67 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 12-6. Dipswitch settings dŚĞϮϰϬ;dͲ,ϯ:ͿͬϯϰϬ;dͲ,ϯ^Ϳ/ŶĚŽŽƌƐŚĂƌĞƐƚŚĞĐŽŵƉƵƚĞƌ ďŽĂƌĚǁŝƚŚƚŚĞϮϰϬ;dͲ,ϯ:ͿͬϯϰϬ;dͲ,ϯ^ͿkƵƚĚŽŽƌ͘dŚĞ /wƐǁŝƚĐŚĞƐŚĂǀĞĐĞƌƚĂŝŶƐƉĞĐŝĂůĨƵŶĐƟŽŶƐĂƐƐŚŽǁŶ ŽŶƚŚĞĨŽůůŽǁŝŶŐƚĂďůĞĂŶĚŐĞŶĞƌĂůůLJƐŚŽƵůĚŶŽƚŶĞĞĚ ...

  • Page 68: 540 (T-H3) Models

    68 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential dŚĞϱϰϬ/ŶĚŽŽƌ;dͲ,ϯͲsͿƐŚĂƌĞƐƚŚĞ computer board with the 540 outdoor ;dͲ,ϯͲk^Ϳ͘dŚĞƌĞĂƌĞƚǁŽďĂŶŬƐŽĨ/wƐǁŝƚĐŚĞƐ (upper and lower bank) on the computer board. DŚĞƵƉƉĞƌďĂŶŬŚĂƐĐĞƌƚĂŝŶƐƉĞĐŝĂůĨƵŶĐƟŽŶƐ ĂƐƐŚŽǁŶŽŶƚŚĞĨŽůůŽǁ...

  • Page 69

    69 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential the lower bank of dipswitches no. Functions on position off position 1 wĂƌĞŶƚͬŚŝůĚƐĞƚƚŝŶŐĨŽƌĂƐLJͲ>ŝŶŬƐLJƐƚĞŵƐ parent child ;ĞĨĂƵůƚͿ 2 3 4 &dн͕&dͲĂŶĚ/ŶƉƵƚͲ (fm speed is increased automatically. See section 12-1...

  • Page 70: Only 540 (T-H3) Models

    70 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 12-7. Assigning unit numbers in the easy-link system only 540 (t-h3) models a. How to display the unit number പഩ press the “increase” ďƵƚƚŽŶŽŶƚŚĞĐŽŵƉƵƚĞƌďŽĂƌĚŽĨ child unit. DŚĞĐŽŶƚƌŽůůĞƌŽĨƚŚĞĐŚŝůĚƵŶŝƚǁŝůůƚŚĞ...

  • Page 71

    71 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 12-8. (a) on/off conditions: overview dŚĞĨŽůůŽǁŝŶŐƚĂďůĞƐŚŽǁƐƚŚĞkeͬk&&ĐŽŶĚŝƚŝŽŶƐŽĨƚŚĞǁĂƚĞƌŚĞĂƚĞƌ͘ ΎkŶůLJŝĨƚŚĞƐĞƚƚĞŵƉĞƌĂƚƵƌĞŝƐďĞůŽǁϭϭϱΣ&;ϰϲȗͿ͘ on / off conditions conditions needed to turn on. DŚĞdhƌĞƋƵŝƌĞŵĞŶƚŝ...

  • Page 72

    72 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 12-8. (b) on/off conditions: btu requirements a. Calculating the on/off conditions of the water heater പ ഩΗŽŶĚŝƚŝŽŶŶĞĞĚĞĚƚŽƚƵƌŶƚŚĞǁĂƚĞƌŚĞĂƚĞƌkeΗ ( t set – t in Ϳп'wdпϱϬϬхϭϰ͕ϴϴϬ "condition needed to turn the ...

  • Page 73: Only 540 (T-H3) Models

    73 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 12-9. Multi-unit system on/off conditions only 540 (t-h3) models /ŶĂŶĂƐLJͲ>ŝŶŬƐLJƐƚĞŵ͕ƚŚĞĂŵŽƵŶƚŽĨϱϰϬ;dͲ,ϯͿŵŽĚĞůƐĐĂůůĞĚŽŶƚŽĂĐƚŝǀĂƚĞĚĞƉĞŶĚƐŽŶƚŚĞflow rate and the set temperature. ϭ͘ŽŶĚŝƚŝŽŶƌĞƋƵŝƌĞĚƚŽĂĐƚŝǀĂƚĞĂŶĂĚ...

  • Page 74: Only 540 (T-H3) Models

    74 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 12-10. Operation time for unit rotation only 540 (t-h3) models dŚĞƵŶŝƚƚŚĂƚƚƵƌŶƐŽŶĨŝƌƐƚŝƐǁŚŝĐŚĞǀĞƌƵŶŝƚƚŚĞϱϰϬ;dͲ,ϯͿŵŽĚĞůƐĚĞĐŝĚĞƐŝƐƚŚĞƉƌŝŵĂƌLJƵŶŝƚ͘ dŚĞƉƌŝŽƌŝƚLJƵŶŝƚǁŝůůƌŽƚĂƚĞǁŚĞŶŝƚƌĞĂĐŚĞƐϭϬϬkeͬk&&ĐLJĐůĞƐŽƌĂĨƚĞƌϭϮŚ...

  • Page 75: Only 540 (T-H3) Models

    75 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial 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 /ŶĂŶĞĂƐLJͲůŝŶŬƐLJƐƚĞŵ͕ŝĨĂƉĂƌĞŶƚƵŶŝƚƵŶĚĞƌŐŽĞƐĂďŶŽƌŵĂůĐŽŶĚŝƚ...

  • Page 76

    76 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 12-12. Easy-link connections with previous models dŚĞϱϰϬ;dͲ,ϯͿĐĂŶďĞĐŽŶŶĞĐƚĞĚǁŝƚŚƚŚĞƉƌĞǀŝŽƵƐŵŽĚĞůƐ͖ϱϮϬ;dͲ,ϮͿ͘ a. Dipswitch setting on the computer board of the 540 (t-h3) b. Basic diagram of connections betwe...

  • Page 77

    77 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential c-1. Temperature settings tŚĞŶƚŚĞϱϰϬ;dͲ,ϯͿŝƐĐŽŶŶĞĐƚĞĚǁŝƚŚĂŶLJϱϮϬ;dͲ,ϮͿĂƐƉĂƌƚŽĨĂŶĂƐLJͲ>ŝŶŬƐLJƐƚĞŵ͕ƚŚĞĂǀĂŝůĂďůĞ ƐĞƚƚĞŵƉĞƌĂƚƵƌĞƐǁŝůůĚĞĨĂƵůƚƚŽǁŚĂƚŝƐĂǀĂŝůĂďůĞŽŶĂϱϮϬ;dͲ,ϮͿ;ĨƌŽŵϭϬϬ°f to 175 °fͬϭϴϱ°f as shown below). ͻ...

  • Page 78

    78 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential high temperature mode d. Diagnostic mode with previous models tŚĞŶƚŚĞϱϰϬ;dͲ,ϯͿŝƐĐŽŶŶĞĐƚĞĚǁŝƚŚϱϮϬ;dͲ,ϮͿĂƐƉĂƌƚŽĨĂŶĂƐLJͲ>ŝŶŬƐLJƐƚĞŵ͕LJŽƵĐĂŶ normally see the ͞ŝĂŐŶŽƐƟĐƐdŽĚĞ͘͟,ŽǁĞǀĞƌ͕ŝĨƚŚĞϱϰϬ;dͲ,ϯͿŝƐĐŽŶŶĞĐƚĞĚǁŝƚŚdͲ,...

  • Page 79

    79 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 12-13. High-altitude region support functions dŚĞŚŝŐŚͲĂůƚŝƚƵĚĞƌĞŐŝŽŶƐƵƉƉŽƌƚĨƵŶĐƚŝŽŶƐŚĂǀĞĨŽƵƌ operation levels, with the appropriate level being set up by the installer until the abnormal sound problem is sol...

  • Page 80

    80 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential kƵƚĚŽŽƌŵŽĚĞůƐŽĨϮϰϬ;dͲ,ϯ:ͿͬϯϰϬ;dͲ,ϯ^Ϳ͗wƌŽƉĂŶĞ level elevation output reduction fan motor speed change dipswitch settings no.3 no.4 no.5 0 Ϭ;&h>dͿ eͬ eͬ off off off 1 hƉƚŽ Ϯ͕ϬϬϬĨƚ eͬ ϯй off on off 2 hƉƚŽ ϰ͕ϬϬϬ...

  • Page 81

    81 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential dŚĞĚĞƐŝƌĞĚůĞǀĞůĐĂŶďĞƐƉĞĐŝĨŝĞĚĂƚƚŚĞ>ŽǁĞƌďĂŶŬŽĨ /wƐǁŝƚĐŚĞƐ;eŽ͘Ϯ͕eŽ͘ϯĂŶĚeŽ͘ϰͿŽŶƚŚĞĐŽŵƉƵƚĞƌďŽĂƌĚ͘ see the table below. фhƐŝŶŐƚŚĞƐĞĨƵŶĐƚŝŽŶƐх 540 (t-h3) models computer board >ŽǁĞƌďĂŶŬŽĨ /wƐǁŝƚĐŚĞƐ /ŶĚŽŽƌŵŽĚĞůƐŽĨ...

  • Page 82

    82 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential kƵƚĚŽŽƌŵŽĚĞůƐŽĨϱϰϬ;dͲ,ϯͿ͗wƌŽƉĂŶĞ level elevation output reduction fan motor speed change dipswitch settings no.2 no.3 no.4 0 Ϭ;&h>dͿ eͬ eͬ off off off 1 hƉƚŽ Ϯ͕ϬϬϬĨƚ eͬ ϯй off on off 2 hƉƚŽ ϰ͕ϬϬϬĨƚ Ͳϭϭй ϳй o...

  • Page 83

    83 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 12-14. Adjusting manifold gas pressure dŚĞŵĂŶŝĨŽůĚŐĂƐƉƌĞƐƐƵƌĞŽŶƚŚĞǁĂƚĞƌŚĞĂƚĞƌĐĂŶďĞĂĚũƵƐƚĞĚďLJĨŽůůŽǁŝŶŐƚŚĞƉƌŽĐĞĚƵƌĞƐďĞůŽǁ͘ adjusting maximum manifold pressure ϭ͘ŶƐƵƌĞƚŚĂƚǁĂƚĞƌŚĞĂƚĞƌŝƐŶŽƚŝŶŽƉĞƌĂƚŝŽŶ͘ Ϯ͘zĞŵŽǀĞƚŚ...

  • Page 84

    84 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential fig. 3 240 (t-h3j) / 340 (t-h3s) models computer board dyďƵƚƚŽŶ d/eďƵƚƚŽŶ /ŶĐƌĞĂƐĞďƵƚƚŽŶ decrease button 540 (t-h3) models computer board d/eďƵƚƚŽŶ dyďƵƚƚŽŶ /ŶĐƌĞĂƐĞďƵƚƚŽŶ decrease button fig. 1 dĂŶŝĨŽůĚƉŽƌƚ...

  • Page 85: Only 540 (T-H3)Models

    85 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 12-15. Manually adjusting the fan motor speed only 540 (t-h3)models while the fm+ dipswitch will automatically increase the fan speed by 6%, the fan motor speed on the 540 (t-h3) models can also be manually ...

  • Page 86

    86 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 12-16. Freeze protection system dŚĞϮϰϬ;dͲ,ϯ:ͿŵŽĚĞůƐ͕ϯϰϬ;dͲ,ϯ^ͿŵŽĚĞůƐĂŶĚϱϰϬkƵƚĚŽŽƌ;dͲ,ϯͲk^ͿŵŽĚĞůƐĨƌĞĞnjĞƉƌŽƚĞĐƚŝŽŶƐLJƐƚĞŵ ŝƐĐŽŵƉƌŝƐĞĚŽĨƚŚĞĐĞƌĂŵŝĐŚĞĂƚŝŶŐďůŽĐŬƐ͘dŚĞĐĞƌĂŵŝĐŚĞĂƚŝŶŐďůŽĐŬƐǁŝůůŚĞĂƚƵƉǁŚĂƚĞǀĞƌƉŽƌƚŝŽŶŽĨ ...

  • Page 87

    87 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential ceramic heating blocks dŚĞƚǁŽŚĞĂƚŝŶŐďůŽĐŬƐĨŽĐƵƐŽŶƉƌŽƚĞĐƚŝŶŐƚŚĞŝŶůĞƚĂŶĚŽƵƚůĞƚƉŝƉŝŶŐŝŶƐŝĚĞƚŚĞǁĂƚĞƌŚĞĂƚĞƌ͕ĂƐǁĞůůĂƐ ƚŚĞĨƌŽŶƚĚƌƵŵƉŝƉĞ͘ dŚĞďůŽĐŬƐǁŝůůŽŶůLJĂĐƚŝǀĂƚĞďĂƐĞĚŽŶǁŚĂƚƚŚĞĨƌĞĞnjĞƉƌŽƚĞĐƚŝŽŶƚŚĞƌŵŽƐƚĂƚƐĞŶƐĞƐ͘dŚĞƚŚ...

  • Page 88

    88 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 12-17. Draining and cleaning the inlet water filter ϭ͘ůŽƐĞƚŚĞŵĂŶƵĂůŐĂƐƐŚƵƚŽĨĨǀĂůǀĞ͘ Ϯ͘dƵƌŶŽĨĨƉŽǁĞƌƚŽƚŚĞǁĂƚĞƌŚĞĂƚĞƌ͕ǁĂŝƚĂĨĞǁƐĞĐŽŶĚƐ͘ŶĚƚŚĞŶƚƵƌŶŽŶĂŐĂŝŶ͘ ϯ͘tĂŝƚϯϬƐĞĐŽŶĚƐĨŽƌǁĂƚĞƌǀĂůǀĞƐƐƚĂƌƚƐƚŽĐŽŵƉůĞƚĞůLJŽƉĞŶ͘ dŚĞŶ...

  • Page 89: 13. Components Diagram

    89 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 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 controller 724 723 722 056...

  • Page 90: Computer Board Assembly

    90 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential computer board assembly surge box assembly 540 (t-h3) models 240 (t-h3j) and 340 (t-h3s) models 710 701 713 103 709 402 707 708 714 721 407 408 701 714 403 715 721 707 722 715 402 402 103 713 708 710 709 716...

  • Page 91: Burner Assembly

    91 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential burner assembly 101 104 115 106 107 108 110 109 111 712 112 062 053 053 709 053 401 103 105 065 054 113 114 102 708 119 151 118 055 051 150 057 055 120 711 712 063 117 053 116 062 121 714 719 707 117 dĂŶŝĨŽů...

  • Page 92: Water Way Assembly

    92 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 402 460 456 461 458 404 417 407 454 405 457 406 410 455 408 458 454 462 c d 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 4...

  • Page 93: 14. Parts List

    93 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential 14. Parts list item # part # description common parts 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 001 eͬ ĂƐĞĂƐƐĞŵďůLJĨŽƌ/ŶĚŽŽƌŵŽĚ...

  • Page 94

    94 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential item # part # description common parts 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 101 319143-514 burner assembly 102 319143-515...

  • Page 95

    95 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential item # part # description common parts for other models 240, 340 and 540 models t-h3j, t-h3s and t-h3models 240, 340 and 540 models t-h3j, t-h3s and t-h3 models 109 319143-037 /ŐŶŝƚĞƌƌŽĚ 910, 710, 520, 320, ...

  • Page 96

    96 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential item # part # description common parts 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 115 319143-032 burner holder gasket 910, 520,...

  • Page 97

    97 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential item # part # description common parts 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 152 319143-523 ^ŝůŝĐŽŶƌŝŶŐĨŽƌkƵƚĚŽŽƌŵŽĚĞůƐ 15...

  • Page 98

    98 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential item # part # description common parts 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 409 319143-530 water outlet 410 319143-199 ou...

  • Page 99

    99 page 240 (t-h3j), 340 (t-h3s) and 540 (t-h3) models service manial ver. 1.00 confidential item # part # description common parts 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 450 319143-088 wŝƉĞŚĞĂƚĞƌĨŝdžŝŶŐƉůĂƚĞ 910, 710...

  • Page 100

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