CONQUEST 90 - Page 88

I
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,,
MAIN BURNER I
NO
SYSTEM WILL ATTEMPT TO LIGHT 4 TIMES. VOLTAGE IS PRESENT AT THE
LIGHTS
I
-
VALVE FOR ONLY 8 SECONDS DURING EACH TRIAL FOR IGNITION (SYSTEM WILL
YES
GO INTO A 1-HOUR LOCKOUT AFTER 4 TRIES). THE BLOWER AND INDUCED
DRAFT BLOWER WILL RUN 180 SEC. IF THE SECOND IGNITION TRIAL FAILS TO
SENSE FLAME.
• CHECK FOR 24 VAC ACROSS THE VALVE
AND VALVE TERMINALS ON THE IFC
• CHECK IGNITER POSITION.
I
NO
• CHECK FOR GAS FLOW TO AND FROM VALVE.
'f
'f
REPLACE VALVE IF NO I
!
REPLACE IFC IF
FLOW THAU VALVE
WIRING TO VALVE IS OK
'
MAIN BURNER
I
NO
NOTE: IF IFC GOES INTO LOCKOUT WAIT 30 SECONDS THEN
REMAINS POWERED
I
-
RESET SYSTEM
AND LIT
• CHECK POLARITY OF 115 VAC SUPPLY
YES
• CHECK CONTINUITY OF GROUND WIRE
• CHECK INSULATION ON IGNITER
• 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 LEO FLASHES
• RESTORE POWER TO UNIT
,,
• IF CHECKS ARE OK, REPLACE IFC
INDOOR BLOWER MOTOR
I
NO
• CHECK FOR 115 VAC ACROSS BLOWER
NO
REPLACE IFC IF
STARTS 20 SECONDS
-
MOTOR ANO BLOWER MOTOR TERMINALS WIRING TO BLOWER
AFTER
MAIN BURNER LIGHTS
I
(HEAT AND NEUTRAL) ON IFC MOTOR IS OK
YES
+YES
'
REPLACE BLOWER MOTOR I
SYSTEM RUNS
I
NO
NOTE: IF IFC GOES INTO LOCKOUT WAIT 30 SECONDS THEN
UNTIL CALL FOR
-
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-
RESET SYSTEM
HEAT ENDS
YES
• CHECK CONTINUITY OF GROUND WIRE. NOTE: IF GROUND IS
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.
• TURN POWER OFF TO UNIT.
• CLEAN FLAME SENSOR WITH STEEL WOOL.
• RESTORE POWER TO UNIT.
• IF CHECKS ARE OK, REPLACE IFC
I
TURN THERMOSTAT TO OFF
NO
• CHECK FOR PROPER THERMOSTAT OPERATION.
VALVE SHUTS OFF
-
I
-
• REMOVE VALVE LEAD AT IFC
FLAME GOES OUT
IF VALVE CLOSED, RECHECK THERMOSTAT ANO
YES
WIRING. IF NOT, REPLACE VALVE .
DRAFT MOTOR STOPS AFTER 5 SEC.
I NO
• CHECK FOR OPEN LIMIT.
I
- IREPLACE IFC
-tYES
INDOOR BLOWER MOTOR
I
NO
• CHECK FOR OPEN LIMIT.
I
STOPS AFTER
-
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-
REPLACE IFC
90/120/160/180 SECONDS
YES
TROUBLESHOOTING ENDS
I
REPEAT PROCEDURE UNTIL TROUBLEFREE
OPERATION IS OBTAINED.
92-22744-18-01
NOTE:
STATIC DISCHARGE CAN DAMAGE INTEGRATED FURNACE CONTROL (IFC)
• "OK" LED BLINKS TO INDICATE EXTERNAL FAULTS:
(1) BLINK FOLLOWED BY A 2 SEC. PAUSE-1 HOUR LOCKOUT
(2) BLINKS FOLLOWED BY A 2
sec.PAUSE - PRESSURE SWITCH IS OPEN
(3) BLINKS FOLLOWED BY A 2 SEC. PAUSE- LIMIT SWITCH IS OPEN
(4} BLINKS FOLLOWED BY A 2 SEC. PAUSE- PRESSURE SWITCH CLOSED
(5) TWINNING FAULT
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