Lennox G26 series Installation Instructions Manual page 27

SURELIGHT CONTROL
HEATING SEQUENCE O FOPEPu_,TION
NORMAL HEATING MODE
I POWERON I !
t
I
CONTROL SELF-CHECK OKAY? NI-NI-NI-NI-NI-NI-NoO
I COMBUSTION AIR INDUCER ON FOR 1 SECOND. I
ABNORMAL HEATING MODE
GAS VALVE OFE COMBUSTION AIR INDUCER ON.
INDOOR BLOWER ON.
LED #1 ALTERNATING FAST FLASH
LED#2 ALTERNATING FAST FLASH
CHECK FOR BROKEN IGNITOR OR
OPEN IGNITOR CIRCUIT
L GAS VALVE OFE COMBUSTION AIR INDUCER OFF.
[
TURN INDUCER ON FOR, SECOND. _ -_1 INDOOR B_EODWER DELAY OFF.
I ,s POLAR,TY REVERSED? / LEDON
- ,
I.o
I [ (RESET CONTROL BY TURNING MAIN POWER OFF.)
LED#1 AND LED#2 /
ALTERNATING FAST I _ / _ POLARITY REVERSED
FLASH. SIGNAL NO / LED #1 - FAST FLASH
HOLDS UNTIL UNIT ISI_ ISTHERE
I YES.J ISVOLTAGE I N° I LED #2- SLOW FLASH
PROPERLY GROUND.I _ PROPER GROUND? ABOVE 75 VOLTS? I_------"l I
g
YES I
II
I LED#1 AND LED#2 ALTERNATING FAST
• NO I _ FLASH. SIGNAL HOLDS UNTIL VOLTAGE
---_1 ROLLOUT SWITCH CLOSED? _ _ RISESAEOVE 75 VOLTS. I
wsI II
I
I_
GAS VALVE OFF. COMBUSTION AIR INDUCER OFF.
I_ _1 INDOOR BLOWER OFF WITH DELAY.
BURNER OFF? L- I LED #1 - ON. LED #2 - SLOW FLASH.
(CONTINUOUS FLAME CHECK) I_L ROLLOUT SWITCH CLOSES
YES _
LED #1 -- SLOW FLASH GAS VALVE OFF. COMBUSTION AIR INDUCER ON.
LED #2 -- SLOW FLASH INDOOR BLOWER ON HEATING SPEED.
LED #1 - SLOW FLASH
LED #2 - OFF
I THERMOSTAT CALLS FOR HEAT:
LED #1 - FAST FLASH
LED #2 - FAST FLASH
I
GAS VALVE OFF.
/
YES _ , : COMBUSTION AIR INDUCER OFF. I
I IS COMBUSTION AIR , NO _ INDOOR BLOWER OFF WITH DELAY.
I
PRESSURE SWITCH OPEN?
I"
LED #1 OFF
I
/ LED #2 SLOW FLASH
YES
(Sequence holds until pressure switch
I IS COMBUSTION AIR INDUCER ENERGIZED? I closes or thermostat resets control.)
I
(HTG ACC TERMINAL IS ENERGIZED WITH C.A.B.) I q
YEsYES T_ _ PRESSURE SWITCH IS IN WATCHGUARD MODE.
I HAS COMBUSTION AIR PRESSURE GAS VALVE OFF. COMBUSTION AIR INDUCER OFF.
SWITCH CLOSED IN 2.5 MINUTES? INDOOR BLOWER OFF WITH DELAY.
/ LED #1 - OFF. LED #2 - SLOW FLASH.
IS 5-MINUTE RESET PERIOD COMPLETE?
5-SECOND COMBUSTION AIR INDUCER PREPURGE
I
INITIATED BY CLOSED PRESSURE swITCH. I
YES _
CONTINUED NEXT PAGE
Page 27