Residential Gas Furnace Operation - HVAC.Amickracing

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Component Identification – ✽UD/ ✽DD-R ModelsINDUCED DRAFTBLOWER (2 SPEED)1ST STAGEPRESSURE SWITCHHIGH TEMPERATURELIMIT (TCO)HIGH VOLTAGEAND ACCESSORYHOOK-UPFLAME ROLL-OUTMAY BE A FUSE LINKOR A BIMETAL SWITCHFLAME SENSOR2ND STAGEPRESSURE SWITCHGAS VALVE(2 STAGE)FLAME ROLL-OUTMAY BE A FUSE LINKOR A BIMETAL SWITCHHOT SURFACEIGNITORINSHOT BURNERTRANSFORMERDOOR SWITCHINTEGRATEDFURNACE CONTROLDIRECT DRIVEBLOWERREVERSE FLOWSWITCH TCO-B✽ Models maybe an A or T5
Component Identification – ✽UY/ ✽DY-R ModelsHIGH TEMPERATURELIMIT SWITCHBURNERSIGHT GLASSELECTRICALJUNCTION BOXFLAME ROLL-OUTSWITCH(MANUAL RESET)2ND STAGEPRESSURE SWITCH1ST STAGEPRESSURE SWITCH2 STAGEGAS VALVEINDUCED DRAFTBLOWER(2 SPEED)TCO (LIMIT)LINE CHOKE(NOT ON ALL MODELS)TRANSFORMERDOOR SWITCHECM TM MOTORCONDENSATETRAPIGNITIONCONTROLECM TM INTERFACEBOARD(MOTOR ONLY)✽ Models maybe an A or T6
Page 1 and 2: 40” Residential GasFurnace Operat
Page 3 and 4: Contents - continuedManifold Pressu
Page 5: Model Nomenclature✽ U C 0 4 0 C 9
Page 9 and 10: White-Rodgers Integrated Furnace Co
Page 11 and 12: White-Rodgers Integrated Furnace Co
Page 13 and 14: White-Rodgers 50A50/50A51 Fault Dia
Page 15 and 16: Single Stage 50A50 and 50A55 Sequen
Page 17 and 18: Two Stage 50A51 Sequence of Operati
Page 19 and 20: Two Stage Variable Speed Sequence o
Page 21 and 22: Integrated Control Quick ReferenceS
Page 23 and 24: ECM TM 2 Variable Speed Furnace Mot
Page 25 and 26: Furnace Motor Control Board Schemat
Page 27 and 28: White-Rodgers Flame Current Tester/
Page 29 and 30: Furnace Pressure Switch SettingsClo
Page 31 and 32: Gas Valves - continuedReplacement P
Page 33 and 34: Direct Vent Manifold Pressure Check
Page 35 and 36: Single Stage Twinning KitBAYTWIN400
Page 37 and 38: Two Stage Twinning KitBAYTWIN300A -
Page 39 and 40: Single Wire Twinning - For Models w
Page 41 and 42: Identifying Radiant Sense Controls5
Page 43 and 44: White-Rodgers 50A52-100 Sequence of
Page 49 and 50: White-Rodgers 50A52-100/101/102 Seq
Page 51 and 52: White-Rodgers Troubleshooting Proce
Page 53 and 54: 50A50 Flow Chart 22CCooling CycleCh
Page 55 and 56: 50A50 Flow Chart 4Main burnerigniti
Page 57 and 58:
50A51 Flow Chart 1Inducer BlowerChe
Page 59 and 60:
50A51 Flow Chart 33AIs diagnosticLE
Page 61 and 62:
50A51 Flow Chart 5Heat thermostatco
Page 63 and 64:
50A52 Flow Chart 2Inducer Draft Mot
Page 65 and 66:
50A52 Flow Chart 4RadiantSensorChec
Page 67 and 68:
Legend - System Wiring50A52 ModelTe
Page 69 and 70:
Notes68
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Residential Gas Furnace Operation - HVAC.Amickracing

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