Lennox G60UHV Series Installation Instructions Manual page 44

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HEATING SEQUENCE OF OPERATION
NORMAL AND ABNORMAL HEATING MODE
I POWER ON I
CONTROL SELF-CHECK OKAY?
1
POLARITY OKAY?
YES
IS THERE A
PROPER GROUND?
YES
_
I._ POLARITY REVERSED,
STATUS ERROR CODE 5 + 4,
.__.1 SIGNAL HOLDS UNTIL UNIT IS PROPERLY GROUNDED.
STATUS ERROR CODE 5 + 3.
A
NORMAL OPERATION:
STATUS LED -- PULSE
,1
B
GAS VALVE OFF. COMBUSTION AIR INDUCER OFF.
INDOOR BLOWER OFF. (RESET CONTROL BY
TURNING MAIN POWER OFF.)
COMBUSTION AIR INDUCER OFF.
INDOOR BLOWER ON. HAS PRIMARY OR
THERMOSTAT CALLS FOR HEAT:
STATUS LED -- HEARTBEAT
YES
PRIMARY AND SECONDARY LIMIT
SWITCHESyEs _ LOSED?
ROLLOUT SWITCH CLOSED?
YES _
FIRST (LOW) STAGE PRESSURE SWITCH [.NO
CONTACTS OPEN?
YES
_
I SECOND (HIGH)coNTACTS YES STAGE _ PRESSURE OPEN? SWITCH I_
r I
I TWO-STAGE OR SINGLE-STAGE THERMOSTAT i._..._
L CALL FOR HEAT 1
STATUS LED -- HEARTBEAT
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CONTINUED ON NEXT PAGE
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60-MINUTE LIMIT WATCHGUARD MODE.
GAS VALVE OFF, COMBUSTION AIR INDUCER
OFF, INDOOR BLOWER OFF WITH DELAY.
STATUS ERROR CODE 4 + 5.
/
SECONDARY LIMIT RESET WITHIN 3 MINUTES? I y_:.q
STATUS ERROR CODE 3 + 1.
GAS VALVE OFR COMBUSTION AIR INDUCER ON.
INDOOR BLOWER ON.
STATUS ERROR CODE 5 + 1.
SEQUENCE HOLDS UNTIL ROLLOUT SWITCH IS
RESET AND MAIN POWER IS INTERRUPTED OR
T'STAT IS CYCLED OFF/ON FOR 3 SEC. MINIMUM,
GAS VALVE OFF. COMBUSTION AIR INDUCER OFR
INDOOR BLOWER OFR CONTROL REMAINS UNTIL
PRESSURE SWITCH IS DETECTED OPEN.
STATUS ERROR CODE 2 + 4
GAS VALVE OFR
COMBUSTION AIR INDUCER OFF.
INDOOR BLOWER OFR
CONTROL WILL NOT ATTEMPT SECOND-STAGE
OPERATION DURING THIS HEAT DEMAND.
FIRST-STAGE OPERATION WILL BE ATTEMPTED.
STATUS ERROR CODE 2 + 6.
YES
Page 44