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Emerson 50A55 manual

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Table of contents for the manual

  • Page 1

    INTEGRA TED FURNA CE CONTROL MODULE TROUBLESHOO TING GUIDE 50A55 INTEGRA TED FURNACE CONTR OL MODULE QualiedServiceman’s T roubleshootingGuide TROUBLESHOO TING PROCEDURE Ifthelightonthemoduleisoncontinuously ,thefaultislikelytobeinternaltothe module.T omakesure,interrup[...]

  • Page 2

    Place thermostat fan s witch in the ON position. Return fa n switch to AU TO position. Indoor Blo we r Check Does indoor bl ow er r un at HEA T speed? YES YES NO NO YES NO YES NO YES NO Indoor blo wer fault. Repair or replace . Check operation. Is 24V present at control terminals G & C? Is 120V present at control terminals COOL & CIR NEUTRA[...]

  • Page 3

    INTEGRA TED FURNA CE CONTROL MODULE TROUBLESHOO TING GUIDE Place thermostat system switch in cooling mode and fa n switch in AU TO position. Lo we r temperature selection lev er to call for a cooling cycle . R & Y contacts close. Return ther mostat to desired setting. With door switch closed, jumper control terminals R & Y. Cooling Cycle Ch[...]

  • Page 4

    Inducer Draft Motor and Pressure Switch Check Is induced draft motor energized? YES YES NO Is diagnostic LED flashing 3 times? Call for heat. Thermostat contacts R & W close. Jumper pressure switch. Disconnect electric po we r at fuse or circuit breaker . Is pressure switch welded closed? Correct blocked or incorrectly installed vent. Check ope[...]

  • Page 5

    Main Burner Ignition Check. Inducer ON. Does ignitor wa rm up and glow? YES YES NO NO Does bu r ner ignite? Tu rn power OFF to furnace. Unplug ignitor from wire harness . Connect voltmeter across ignitor wiring harness leads from control. Energize system. Tu rn manual knob to OFF position. Connect manometer to outlet pressure tap . Tu rn knob to ON[...]

  • Page 6

    Flame Sensor Check Does main bu r ner remain lit? YES NO YES NO Is bl ow er at heat speed within 1 minute of bu r ner ignition? Does ignitor remain energized with flame present? De-energize system. Disconnect 12-pin connector . Connect ohmmeter from flame sensor pin FP to bu r ner GROUND . Replace sensor . Energize system. Check operation. NO Repla[...]