Thermo Pride CMA4-50D36N Installation And Service Manual page 47

MAIN
BURNER
OPERATION
HEATING SPEED. THE (OPTIONAL)
CALL
FOR
HEAT LOSS, INDUCER STARTS 5 SECOND
SATISFIED
END
OF CYCLE
AFTER DELAY-TO-FAN-ON
PERIOD ENDS, CIRCULATING
AIR FAN IS ENERGIZED AT
ELECTRONIC AIR CLEANER
AND HUMIDIFIER ARE
ENERGIZED.
WHEN THERMOSTAT IS
SATISFIED, CONTACTS
OPEN AND THE GAS
VALVE IS DE-ENERGIZED.
AFTER PROOF OF FLAME
POST SURGE AND (OPTIONAL)
HUMIDIFIER ARE
DE-ENERGIZED. THE DELAY-
TO-FAN-OFF PERIOD
BEGINS (120 SECONDS)
AFTER THE DELAY-TO-
FAN-OFF PERIOD ENDS,
THE CIRCULATING AIR
FAN AND (OPTIONAL)
ELECTRONIC AIR CLEANER
ARE DE-ENERGIZED.
THE RETRY SEQUENCE
PROVIDES A 60 SECOND
WAIT BEFORE IGNITION
ATTEMPTED WITH AN
ADDITIONAL 10 SECONDS
OF IGNITOR WARM-UP
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 FOR A TOTAL OF SIX
RECYCLES. AFTER SIX UNSUCCESSFUL
RECYCLE ATTEMPTS, THE CONTROL
WILL GO INTO SYSTEM LOCKOUT.
IF SYSTEM IS IN LOCKOUT, THE
MODULE WILL RESET ITSELF AFTER
60 MINUNTES 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.
42
RETRY. RETRY IS
TIME.