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HEATING SEQUENCE
NORMAL HEATING MODE
I POWER ON I
CONTROL | I_ |
COMBUSTION AIR iNDUCER ON FOR 1 SECOND. I
POLARITY OKAY?
YES _
OF OPERATION
ABNORMAL HEATING MODE
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
I | ROLLOUT SWITCH CLOSED? |
I | YES |
BURNER OFF? | |
(CONTINUOUS FLAME CHECK) | |
I | YES _ |
NORMAL OPERATION: | |
LED #1 | |
LED #2 - SIMULTANEOUS SLOW FLASH | |
| THERMOSTAT CALLS FOR HEAT: |
| LED #1 |
| LED #2 - FAST FLASH |
YF,_ _1
IPRIMARY LIMIT SWITCH CLOSED?
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
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| PREBSUREBW,TCHCONTACTSOPEN?I1 | ||||||||||
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| (HIGH AND LOW HEAT) |
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| GAS VALVE OFF. | |||
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| YES _ |
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| NO | COMBUSTION | AIR INDUCER OFE | ||
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| INDOOR BLOWER OFF DELAY. | ||||
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| ENERGIZEENERGIZECOMBUSTIONHTGACC TERMINALAIRINDUCER, | I |
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| LED #1 OFF | |||||
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| LED #2 SLOW FLASH | ||||||||
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| YES |
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| (Sequence holds until pressure switch | |||
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| doses or thermostat resets control.) | ||||
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| IS UNIT PROPERLY GROUNDED? | NO | |||||||||
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| YES_I |
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| COMBUSTION | AIR INDUCER OFE | ||
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| INDOOR BLOWER OFR | |||
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| LED #1 - ALTERNATING FAST FLASHES | |||
I | ..I1[ | IS LINE VOLTAGE_ABOVE 75 VOLTS?lr |
| LED #2 | - ALTERNATING FAST FLASHES | |||||||
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I | W2TtMEDMOOE |
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CALLPOR fST STAGEHEAT "l | SINGLESTAGE T'STAT | JL |
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I | ONCOMBUSTIONAIRLOWSPEED(t 2"5INDUCERMINUTES) I | I | COMBUSTIONAIR ,NDUCER |
| PRESSURE SWITCH WATCHGUARD | |||||||
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| ON HIGHSPEED(t 2,5 MINUTES) I |
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| (5 MINUTES) |
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| COMBUSTION AIR INDUCER OFF. | ||
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| INDOOR BLOWER OFR | |||
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| SWITCHCLOSED? |
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| SWffCH CLOSED? |
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| LED #1 OFF | |||
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| (75 kBtuhmodelonly) |
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| LED #2 SLOW FLASH | ||
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| YES_ |
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| _ YES |
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| WATCHGUARD | |||
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| (SIGNAL LIMIT OR IGNITION FAILURE) | |||
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| 15PREPURGESECONDS |
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| GAS VALVE OFF, COMBUSTION AIR | ||||
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| INDUCER AND INDOOR BLOWER OFF. | |||||||
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| CONTINUED | ON NEXT | PAGE |
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| LED #1 AND LED#2 | |||
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| ALTERNATING SLOW FLASHES | |||||||
Page 28
