Lennox G26 series Installation Instructions Manual page 29

SURELIGHT CONTROL
COOLING SEQUENCE O FOPERATION
NORMAL COOLING MODE ABNORMAL C OOLING MODE
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I POWER ON I
IGNITION CONTROL MAIN POWER ON. I
CONTROL SELF DIAGNOSTIC CHECK.
IS CONTROL OPERATING NORMALLY?
YES JI
TURN INDUCER ON FOR 1 SECOND. I
YES r
IS POLARITY REVERSED? L-_=-z--_l
/
LED#1 AND LED#2
1
NO J,
ALTERNATING FAST I NO , IS THERE • ' '
FLASH, SIGNAL _
I YE&I
IS VOLTAGE
HOLDS UNTIL UNIT IS _ PROPER GROUND? I_"WlABOVE 75 VOLTS?
PROPERLY GROUND. J
GAS VALVE OFF. COMBUSTION AIR INDUCER OFE
INDOOR BLOWER OFF WITH NORMAL DELAY.
SIGNAL CIRCUIT BOARD FAILURE AT LED.
INTERRUPT MAIN POWER TO RESET CONTROL•
LED#1 FAST FLASH LED#2 SLOW FLASH ]
N I LED#1 AND LED#2 ALTERNATING FAST
I_O-_ FLASH. SIGNAL HOLDS UNTIL VOLTAGE
I<_1 RISES ABOVE 75 VOLTS•
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ROLLOUT SWITCH MONITORED CONTINUOUSLY.
IS ROLLOUT SWITCH CLOSED?
YES_
CHECK FOR MAIN BURNER FLAME SENSE.
IS MAIN BURNER FLAME OFF?
LED: SLOW FLASH RATE REMAINS UNCHANGED
THROUGHOUT COOLING CYCLE.
THERMOSTAT CALLS FOR COOLING,
€
COMPRESSOR CONTACTOR AND SYSTEM FAN
ENERGIZED WiTH 0-SECOND DELAY, ACB
COOL SPEED TERMINAL IS ENERGIZED. ACC,
TERMINAL IS ENERGfZED.
€
THERMOSTAT OPENS•
COMPRESSOR OFE
€
SYSTEM FAN AND ACC. TERM. OFF
WITH 0_ECOND DELAY,
GAS VALVE OFF. COMBUSTION AIR INDUCER OFF.
INDOOR BLOWER OFF WITH NORMAL DELAY.
SIGNAL CIRCUIT BOARD FAILURE AT LED,
SEQUENCE HOLDS UNTIL ROLLOUT SWITCH CLOSES
GAS VALVE OFF. COMBUSTION AIR INDUCER OFE
INDOOR BLOWER OFF WITH NORMAL DELAY.
SIGNAL CIRCUIT BOARD FAILURE AT LED.
SEQUENCE HOLDS UNTIL FLAME IS NOT SENSED.
Page 29