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HEATING SEQUENCE OF OPERATION
NORMAL HEATING MODE
ABNORMAL HEATING MODE
POWER ON ]
No
I CONTROL SELF-CHECK OKAY?
I COMBUSTION AIR SLOWER ON FOR I SECOND. I
TURN INDUCER ON FOR 1 SECOND. I_
I IS POLARITY REVERSED?
GAS VALVE OFF. COMBUSTION AIR BLOWER OFF.
INDOOR BLOWER DELAY OFF.
LED#1 ON
LED #2 ON
(RESET CONTROL BY TURNING MAIN POWER OFF,)
POLARITY REVERSED.
LED #1 - FAST FLASH
LED #2 - SLOW FLASH
I SIGNAL IMPROPERI / NO
GROUND AT LED NO • NO
SIGNAL HOLDS _1 IS THERE I YES I S VOLTAGE _ LOW VOLTAGE SIGNAL AT LED HOLDS
UNTIL UNIT IS "_1 PROPER GROUND?r_I ABOVE 75vOLTS? _ UNTIL VOLTAGE RISES ABOVE75 VOLTS'I
PROPERLY
GROUNDED. NO I GAS VALVE OFF. COMBUSTION AIR BLOWER OFF, I
ROLLOUT SWITCH CLOSED_ i l INDOOR BLOWER OFF WITH DELAY. I
"_ll" I • t'il'_ I LED #1 - ON. LED #2 - SLOW FLASH. I
YES I | SEQUENCE HOLDS UNTIL ROLLOUT SWITCH CLOSESt
GAS VALVE OFF. COMBUSTION AIR BLOWER ON,
NO
I
INDOOR BLOWER ON HEATING SPEED. I
LED #1 - SLOW FLASH
I
LED #2 - OFF
GAS VALVE OFF.
COMBUSTION AIR BLOWER OFF.
INDOOR BLOWER OFF WITH DELAY
LED #1 OFF
I LED #2 SLOW FLASH
(Sequence ho_dsuntil pressure switch
closes or thermostat resets contmt.)
PRESSURE SWITCH WATCHGUARD MODE. IT
GAS VALVE OFF. COMBUSTION AIR BLOWER OFF.I I
INDOOR BLOWER OFF WITH DELAY. r-
LED #1 -- OFF. LED #2 - SLOW FLASH. |
IS S-MINUTE RESET PERIOD COMPLETE? l
[
BURNER OFF?
(CONTINUOUS FLAME CHECK)
YES
NORMAL OPERATION: I
LED #1 - SLOW FLASH
LED #2 - SLOW FLASH
+
THERMOSTAT CALLS FOR HEAT:
LED #1 - FAST FLASH
LED #2 - FAST FLASH
YES
i
I IS COMBUSTION AIR I
PRESSURE SWITCH OPEN? I-
YES
I IS COMBUSTION AIR BLOWER ENERGIZED?
I
(HTG. ACC. ENERGIZED WITH CAB.) =,I
YES _
I HAS COMBUSTION AIR PRESSURE
SWITCH CLOSED IN 2.5 MINUTES?
YES
15-SECOND COMBUSTION AIR BLOWER PREPURGEI
INITIATED BY CLOSED PRESSURE SW TCH. /
YES _
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Page 29
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