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INTEGRATED FURNACE CONTROL MODULE

Cooling Cycle Check

Place thermostat system switch in cooling mode and fan switch in AUTO position. Lower temperature selection lever to call for a cooling cycle. R & Y contacts close.

2C

2D

Does indoor blower energize at heating fan speed?

YES

Is thermostat terminal Y connected to furnace terminal Y?

NO

NO

Correct wiring from thermostat terminal Y to Y on furnace. Check operation.

2G

Is 24V present across control terminals Y & C?

YES

NO

2I

2J

Is 24V present at control terminals R & C?

NO

Is 24V present at control terminals G & C?

YES

YES

Repair low voltage wiring to thermostat. Check operation.

Repair low voltage wiring from transformer to control. Check operation.

YES

NO

CHART 2

2A

Does indoor blower energize at cooling fan speed?

NO

2E

With door switch closed, jumper control terminals R & Y.

2K

Is 120V present at primary of transformer?

NO

2L

Is 120V present at control terminals LINE & LINE NEUTRAL?

NO

Correct 120V power supply to control. Check operation.

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YES

YES

YES

TROUBLESHOOTING GUIDE

2B

Return thermostat to desired setting.

2F

Does indoor blower energize at cooling fan speed?

YES

Repair low voltage wiring to thermostat. Check operation.

NO

2H

Is 120V present at control terminals COOL & CIR NEUTRAL?

YES

Indoor blower fault. Repair or replace motor. Check operation.

NO

Replace control. Check operation.

Replace transformer. Check operation.

Repair wiring between control and transformer primary. Check operation.

!

WARNING

If diagnostic indicator (LED) shows continuous flashing, turn off gas supply at source before disconnecting electrical power!

267

TECHNICAL HELP

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