Surelight Control Heating Sequence Of Operation; Normal Heating Mode; Abnormal Heating Mode - Lennox G24M SERIES Unit Information

NORMAL HEATING MODE

CONTROL SELF--CHECK OKAY?
COMBUSTION AIR BLOWER ON FOR 1 SECOND.
TURN INDUCER ON FOR 1 SECOND.
SIGNAL IMPROPER
GROUND AT LED.
NO
SIGNAL HOLDS
UNTIL UNIT IS
PROPERLY
GROUNDED.
ROLLOUT SWITCH CLOSED?
(CONTINUOUS FLAME CHECK)
THERMOSTAT CALLS FOR HEAT:
PRESSURE SWITCH OPEN?
IS COMBUSTION AIR BLOWER ENERGIZED?
(HTG ACC TERMINAL IS ENERGIZED WITH C.A.B.)
HAS COMBUSTION AIR PRESSURE
SWITCH CLOSED IN 2.5 MINUTES?
15-SECOND COMBUSTION AIR BLOWER PREPURGE
INITIATED BY CLOSED PRESSURE SWITCH.
CONTINUED NEXT PAGE
SURELIGHT CONTROL HEATING
SEQUENCE OF OPERATION
POWER ON
IS POLARITY REVERSED?
NO
IS THERE YES
PROPER GROUND?
YES
BURNER OFF?
YES
NORMAL OPERATION:
LED #1 ---- SLOW FLASH
LED #2 ---- SLOW FLASH
LED #1 ---- FAST FLASH
LED #2 ---- FAST FLASH
YES
IS COMBUSTION AIR
YES
YES
YES
YES
GAS VALVE OFF. COMBUSTION AIR BLOWER ON.
NO
GAS VALVE OFF. COMBUSTION AIR BLOWER OFF.
YES
(RESET CONTROL BY TURNING MAIN POWER OFF.)
NO
IS VOLTAGE
ABOVE 75 VOLTS?
YES
NO
GAS VALVE OFF. COMBUSTION AIR BLOWER OFF.
NO
SEQUENCE HOLDS UNTIL ROLLOUT SWITCH CLOSES.
GAS VALVE OFF. COMBUSTION AIR BLOWER ON.
NO
PRESSURE SWITCH IS IN WATCHGUARD MODE.
NO
GAS VALVE OFF. COMBUSTION AIR BLOWER OFF.
LED #1 ---- OFF. LED #2 ---- SLOW FLASH.
IS 5-MINUTE RESET PERIOD COMPLETE?
3DJH 

ABNORMAL HEATING MODE

INDOOR BLOWER ON.
LED #1 ALTERNATING FAST FLASH
LED#2 ALTERNATING FAST FLASH
CHECK FOR BROKEN IGNITOR OR
OPEN IGNITOR CIRCUIT
INDOOR BLOWER DELAY OFF.
LED #1 ON
LED #2 ON
POLARITY REVERSED.
LED #1 ---- FAST FLASH
LED #2 ---- SLOW FLASH
LOW VOLTAGE SIGNAL AT LED HOLDS
UNTIL VOLTAGE RISES ABOVE 75 VOLTS.
INDOOR BLOWER OFF WITH DELAY.
LED #1 ---- ON. LED #2 ---- SLOW FLASH.
INDOOR BLOWER ON HEATING SPEED.
LED #1 ---- SLOW FLASH
LED #2 ---- OFF
GAS VALVE OFF.
COMBUSTION AIR BLOWER OFF.
INDOOR BLOWER OFF WITH DELAY.
LED #1 OFF
LED #2 SLOW FLASH
(Sequence holds until pressure switch
closes or thermostat resets control.)
INDOOR BLOWER OFF WITH DELAY.