CONQUEST 80 - Page 88

•
,,
MAIN BURNER
I
LIGHTS
YES
,~
I
MAIN BURNER
REMAINS POWERED
ANO LIT
I
NO
-
I
I
NO
I
YES
t
INDOOR BLOWER MOTOR
I
NO
STARTS 20 SECONDS
AFTER
MAIN GAS VAL VE OPENS
I I
YES
SYSTEM RUNS
UNTIL CALL FOR
I
HEAT ENDS
YES
t
I
TURN THERMOSTAT TO OFF
VAL VE SHUTS OFF
FLAME GOES OUT
tYES
I
DRAFT MOTOR STOPS AFTER 5 SEC.
wYES
REPLACE BLOWER MOTOR I
I
NO
NOTE: IF IFC GOES INTO LOCKOUT
WAIT 30 SECONDS THEN
-
I
-
RESET SYSTEM
• 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.
I
NO
-
• IF CHECKS ARE OK, REPLACE IFC
• CHECK FOR PROPER THERMOSTAT OPERATION.
I
-
• REMOVE VALVE LEAD AT IFC
IF VALVE CLOSED, RECHECK THERMOSTAT ANO
WIRING. IF NOT, REPLACE VALVE .
NO
• CHECK FOR OPEN LIMIT.
I
-
REPLACE IFC
I
INDOOR BLOWER MOTOR
STOPS AFTER
I
90/120/160/180 SECONDS
YES
I
TROUBLESHOOTING ENOS
I
NOTE:
REPLACE IGNITER
I
SYSTEM WILL ATTEMPT TO LIGHT 4 TIMES .
VOLTAGE IS PRESENT AT THE VALVE FOR
ONLY 8 SECONDS DURING EACH TRIAL FOR
IGNITION (SYSTEM WILL GO INTO A 1-HOUR
LOCKOUT AFTER 4 TRIES). THE BLOWER ANO
IOM WILL RUN 180 SEC. IF THE SECOND
IGNITION TRIAL FAILS TO SENSE FLAME.
• CHECK FOR 24 VAC ACROSS THE VALVE
ANO VALVE TERMINALS ON THE IFC
f YES
• CHECK IGNITER POSITION.
I
• CHECK FOR GAS FLOW TO ANO FROM VALVE.
f NO
REPLACE VALVE IF NO
I
FLOWTHRU VALVE
NOTE: IF {IFC) GOES INTO LOCKOUT WAIT 30 SECONDS THEN
-
RESET SYSTEM
-
• CHECK POLARITY OF 115 VAC SUPPLY
• CHECK CONTINUITY OF GROUND WIRE
• CHECK INSULATION ON IGNITER
• CHECK FLAME SENSE CURRENT (YELLOW LEO)
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
• CHECK FOR 115 VAC ACROSS BLOWER ~REPLACE IFC IF
MOTOR ANO BLOWER MOTOR TERMINALS NO WIRING TO BLOWER
(HEAT AND NEUTRAL) ON IFC MOTOR IS OK
+YES
-
I
NO
-
-
• CHECK FOR OPEN LIMIT. I
REPLACE IFC
REPEAT PROCEDURE UNTIL TROUBLEFREE
OPERATION IS
OBTAINED.
STATIC DISCHARGE CAN DAMAGE INTEGRATED FURNACE CONTROL (IFC)
• "OK" LEO 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
92-22744-12-03
J
87