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HEATING SEQUENCE OF OPERATION
NORMAL HEATING MODE
ABNORMAL HEATING MODE
I
I
I
I
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I POWER ON I
CONTROL SELF-CHECK OKAY? I_
COMBUSTION AIR iNDUCER ON FOR 1 SECOND. I
POLARITY OKAY?
YES _
ROLLOUT SWITCH CLOSED?
YES
BURNER OFF?
(CONTINUOUS FLAME CHECK)
YES _
NORMAL OPERATION:
LED #1 -- SIMULTANEOUS SLOW FLASH
LED #2- SIMULTANEOUS SLOW FLASH
THERMOSTAT CALLS FOR HEAT:
LED#1 -- FAST FLASH
LED #2 - FAST FLASH
YF,_ _1
I PRIMARY LIMIT SWITCH CLOSED?
I PREBSUREBW,TCHCONTACTSOPEN?I_1
(HIGH AND LOW HEAT)
YES _ NO
I ENERGIZE COMBUSTION AIR INDUCER,ENERGIZE HTG ACC TERMINAL I
YES
IS UNIT PROPERLY GROUNDED? 1--1 NO
YES_I , h
I ..I1[ IS LINE VOLTAGE_ABOVE 75 VOLTS?lr --_-_
I
I TWO-STAGEMODE "ilI" W2TtMEDMOOE II SI_LE-STAGEMODE 1
CALLPORfST STAGEHEAT "l SINGLESTAGET'STAT HIGHHF-.ATONLY I
JL J
,.......
I COMBUSTIONAIRINDUCERON LOWSPEED(t 2"5MINUTES) I I COMBUSTIONAIR,NDUCER
ON HIGHSPEED(t2,5MINUTES) I
LOW-HEATPRESSURE
SWITCHCLOSED?
(75kBtuhmodelonly)
YES_
[
"'OR-" PRESSOREI "
SWffCH CLOSED?
_ YES
PREPURGE I15SECONDS
CONTINUED ON NEXT PAGE
GAS VALVE OFF. COMBUSTION AIR INDUCER OFF.
INDOOR BLOWER DELAY OFF,
LED #1 ON
LED #2 ON
(RESET CONTROL BY TURNING MAIN POWER OFF,)
POLARITY REVERSED.
LED #1 - FAST FLASH
LED #2 -- SLOW FLASH
GAS VALVE OFE COMBUSTION AIRINDUCER OFE
INDOOR BLOWER OFF DELAY.
LED #1- ON
LED #2 - SLOW FLASH
GAS VALVE OFF. COMBUSTION AIR INDUCER ON.
INDOOR BLOWER ON.
LED #1 - SLOW FLASH
LED #2 - OFF
COMBUSTION AIR INDUCER OFF.
INDOOR BLOWER ON.
LED #1 - SLOW FLASH
LED #2 - ON
GAS VALVE OFF.
COMBUSTION AIR INDUCER OFE
INDOOR BLOWER OFF DELAY.
LED #1 OFF
LED #2 SLOW FLASH
(Sequence holds untilpressure switch
doses or thermostat resets control.)
COMBUSTION AIR INDUCER OFE
INDOOR BLOWER OFR
LED #1 - ALTERNATING FAST FLASHES
LED#2 - ALTERNATING FAST FLASHES
PRESSURE SWITCH WATCHGUARD
(5 MINUTES)
COMBUSTION AIR INDUCER OFF.
INDOOR BLOWER OFR
LED #1 OFF
LED #2 SLOW FLASH
WATCHGUARD 60-MINUTE DELAY
(SIGNAL LIMIT OR IGNITION FAILURE)
GAS VALVE OFF, COMBUSTION AIR
INDUCER AND INDOOR BLOWER OFF.
LED #1 AND LED#2
ALTERNATING SLOW FLASHES
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