Thermo Pride GMD1-80N Installation And Service Manual page 32

All installations and services must be performed by qualified service personnel.
MAIN
BURNER
OPERATION
CALL
FOR HEAT
SATISFIED
END OF CYCLE
AFTER DELAY-TO-FAN--ON
PERIOD ENDS, CIRCULATING
AIR FAN IS ENERGIZED AT
HEATING SPEED. THE
(OPTIONAL) ELECTRONIC
AIR CLEANER AND
HUMIDIFIER ARE ENERGIZED.
WHEN THERMOSTAT IS
SATISFIED, CONTACTS
OPEN AND THE GAS
VALVE IS DE-ENERGIZED.
AFTER PROOF OF FLAME
LOSS, INDUCER STARTS
5 SECOND POST SURGE
AND (OPTIONAL) HUMIDIFIER
IS DE-ENERGIZED. THE
DELAY-TO-FAN-OFF PERIOD
BEGINS (180 SECONDS)
AFTER THE DELAY-TO-
FAN-OFF PERIOD ENDS,
THE CIRCULATING AIR
FAN AND (OPTIONAL)
ELECTRONIC AIR CLEANER
ARE DE-ENERGIZED.
PROVIDES A 60 SECOND
ADDITIONAL 10 SECONDS
OF IGNITOR WARM-UP TIME.
IF IGNITION ATTEMPT IS
UNSUCCESSFUL, ONE
MORE RETRY WILL BE
MADE BEFORE THE
CONTROL BOARD GOES
INTO SYSTEM LOCKOUT.
IF FLAME IS DETECTED,
THEN LOST, THE CONTROL
BOARD WILL REPEAT THE
INITIAL IGNITION SEQUENCE
RECYCLES. AFTER SIX
UNSUCCESSFUL RECYCLE
ATTEMPTS, THE CONTROL
WILL GO INTO SYSTEM
IF SYSTEM IS IN LOCKOUT, THE
MODULE WILL RESET ITSELF
AFTER 60 MINUTES OR MAY
BE MANUALLY RESET BY
INTERRUPTING THE POWER
TO THE FURNACE AT THE
DISCONNECT OR INTERRUPTING
THE CALL FOR HEAT AT THE
THERMOSTAT. IF THIS DOES
NOT RESTART THE SYSTEM,
REFER TO THE TROUBLESHOOTING
SECTION OF THIS MANUAL.
31
THE RETRY SEQUENCE
WAIT BEFORE IGNITION
RETRY. RETRY IS
ATTEMPTED WITH AN
FOR A TOTAL OF SIX
LOCKOUT.