Lennox G32V Series Service Literature page 58

NORMAL HEATING MODE
IGNITION SEQUENCE BEGINS
(Ignition trial counter initiated.)
TWO−STAGE MODE
CALL FOR 1st STAGE HEAT
MAIN GAS VALVE OPEN
LOW HEAT ONLY
4 SECONDS
FLAME RECTIFICATION CURRENT CHECK
(Response time −− 2 seconds maximum.)
"HEAT" LED−DS2 LIT INDOOR BLOWER ON DELAY BEGINS
TWO−STAGE MODE
CALL FOR 1st STAGE HEAT
CFM" LED−DS4 BLINKS ONCE
FOR EVERY 100CFM. INDOOR
BLOWER ON LOW SPEED
(Continuous flame check)
PRIMARY LIMIT SWITCH CLOSED?
ROLLOUT SWITCH CLOSED?
PROVE SWITCH CLOSED?
(CONTINUED ON NEXT PAGE)
CONTINUED ON NEXT PAGE
HEATING SEQUENCE CONTINUED
PREPURGE
15 SECONDS
IGNITOR WARM−UP
(20 SECONDS)
W2 TIMED MODE
SINGLE STAGE T'STAT
MAIN GAS VALVE OPEN
LOW HEAT ONLY
SECOND STAGE
TIME ON BEGINS
(u0.20 microamps)
FLAME PRESENT?
(45 seconds.)
W2 TIMED MODE
SINGLE STAGE T'STAT
CFM" LED−DS4 BLINKS ONCE FOR
EVERY 100CFM. INDOOR BLOWER
ON HIGH HEATING SPEED
FLAME PRESENT?
FLAME SIGNAL
(u0.61 microamps)
SINGLE−STAGE MODE
NO
HIGH HEAT ONLY
GAS VALVE OPEN
HIGH AND LOW HEAT
NO
GAS VALVE
DE−ENERGIZED
SINGLE−STAGE MODE
HIGH HEAT ONLY
NO
LOW FLAME SIGNAL
LED #1 −− SLOW FLASH
NO LED #2 −− FAST FLASH
GAS VALVE DE−ENERGIZED.
NO
COMBUSTION AIR INDUCER DE−ENERGIZED.
INDOOR BLOWER ON.
LED #1 − SLOW FLASH; LED #2 − ON.
NO
(See table 8 DIAGNOSTIC CODES for limit reset operation) YES
GAS VALVE DE−ENERGIZED.
COMBUSTION AIR INDUCER DE−ENERGIZED.
INDOOR BLOWER OFF DELAY (Selected time)
LED #2 −− SLOW FLASH
Page 58
ABNORMAL HEATING MODE
WATCHGUARD 60-MINUTE DELAY
(SIGNAL LIMIT OR IGNITION FAILURE)
GAS VALVE OFF. COMBUSTION AIR
AND INDOOR BLOWER OFF.
LED #1 AND LED #2
ALTERNATING SLOW FLASHES
WATCHGUARD −− FLAME FAILURE.
GAS VALVE OFF.
COMBUSTION AIR INDUCER OFF.
INDOOR BLOWER OFF.
LED #1 & LED #2 ALTERNATE FLASH.
YES
CONTROL CHECKS RETRY
FOR IGNITION COUNT.
HAVE FOUR RE-TRIES
BEEN COMPLETED?
WATCHGUARD 60-MINUTE DELAY
LIMIT SWITCH. GAS VALVE OFF.
COMBUSTION AIR AND INDOOR
BLOWER OFF. LED #1 SLOW FLASH
AND LED #2 ON. IS 60 MINUTE RESET
PERIOD COMPLETE?
HAS LIMIT RESET?
LED #1 −− ON
YES
NO