CONQUEST 80 - Page 84

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NOTE: IF (IFC) GOES INTO LOCKOUT WAIT 30 SECONDS THEN
REMAINS POWERED
MAIN BURNER
NO
RESET SYSTEM
-
AND LIT
• CHECK POLARITY OF 115VAC SUPPLY
YES
• CHECK CONTINUITY OF GROUND WIRE
• CHECK INSULATION OF IGNITER LEADS
• CHECK FLAME SENSE CURRENT (YELLOW LED)
LED IS ON IF FLAME CURRENT IS GOOD.
IT FLASHES IF CURRENT IS MARGINAL.
• TURN POWER OFF TO UNIT
• CLEAN FLAME SENSOR WITH STEEL WOOL IF LED FLASHES
• RESTORE POWER TO UNIT
• IF CHECKS ARE OK, REPLACE (IFC)
·~
• CHECK FOR 115VAC ACROSS REPLACE (IFC) IF
STARTS 22 SECONDS
NO
INDOOR BLOWER MOTOR
NO
-
BLOWER MOTOR AND BLOWER
I------+- WIRING TO BLOWER
AFTER GAS VALVE OPENS
MOTOR TERMINALS ON (IFC) MOTOR IS OK
YES
• YES
REPLACE BLOWER MOTOR
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NOTE: IF (IFC) GOES INTO LOCKOUT WAIT 30 SECONDS THEN
UNTIL CALL FOR
SYSTEM RUNS
NO
RESET SYSTEM
HEAT ENDS
:-
• CHECK CONTINUITY OF GROUND WIRE. NOTE: IF GROUND IS
YES
POOR OR ERRATIC, SHUTDOWN MAY OCCUR OCCASIONALLY
EVEN THOUGH OPERATION IS NORMAL AT THE TIME
OF CHECKOUT.
• CHECK FLAME SENSE CURRENT
• CHECK FOR EXCESSIVE HEAT AT IGNITER BASE
(TEMP. ABOVE 1000 F (538 C) CAUSES SHORT TO GROUND)
• TURN POWER OFF TO UNIT
• CLEAN FLAME SENSOR WITH STEEL WOOL
• RESTORE POWER TO UNIT
• IF CHECKS ARE OK, REPLACE (IFC)
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• CHECK FOR PROPER THEMOSTAT OPERATION
VALVE SHUTS OFF
TURN THERMOSTAT TO OFF
NO
• REMOVE VALVE LEAD AT GAS VALVE
-
IF VALVE CLOSED, RECHECK THERMOSTAT AND
WIRING. IF NOT, REPLACE VALVE.
YES
NO
IDM MOTOR STOPS AFTER 5 SEC.
-
• CHECK FOR OPEN LIMIT.
FLAME OFF
• REPLACE (IFC)
YES
NO
-
• CHECK FOR OPEN LIMIT.
STOPS AFTER
INDOOR BLOWER MOTOR
• REPLACE (IFC)
90/120/160/180 SECONDS
YES
REPEAT PROCEDURE UNTIL TROUBLEFREE
OPERATION IS OBTAINED.
TROUBLESHOOTING ENDS
NOTE: STATIC DISCHARGE CAN DAMAGE INTEGRATED FURNACE CONTROL (IFC)
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