Lennox G60UHV Series User Manual

CONTINUED
HEATING SEQUENCE OF OPERATION
NO
NO
I FIRST-STAGE(LOWF,RE)PRESSUREISWITCH CLOSED WITHIN 2.5 MINUTES?
YES _
15-SECOND COMBUSTION AIR INDUCER I
m
PRE-PURGE INITIATED BY CLOSED FIRST-STAGE
i
PRESSURE SWITCH (or 15 SECOND
INTER-PURGE PERIOD.)
STATUS LED -- HEARTBEAT.
[ IGNITORWARM-UPI_0SECONDStJSTATUS LED -- HEARTBEAT.
YES _
I is IGNITOR INTACT AND CONNECTED? i
YES
I AT END OF IGNITOR 20 SECOND WARM UP I
I
PERIOD, 4-SECOND TRIAL FOR IGNITION. I
GAS VALVE OPENS, IGNITOR ENERGIZED DURING
4-SECOND TR AL UNT L FLAME SENSED,
YES
I 4-SECOND FLAME STABILIZATION PERIOD. I NO
I FLAME RECTIFICATION CURRENT CHECK
CAN FLAME BE PROVEN WITHIN 4
SECONDS AFTER GAS VALVE OPENS?
( > 0.20 microamps)
FLAMEyESPRESENT?_ IN--_-_°
CONTINUED ON NEXT PAGE J
I
[
---4
THERMOSTAT CALLS FOR HEAT
STATUS LED - HEARTBEAT.
(Refer to box A on previous page)
GAS VALVE OFR COMBUSTION AIR INDUCER
OFF. INDOOR BLOWER OFF. UNIT WILL RETRY
AFTER 5-MINUTE WAIT PERIOD,
STATUS ERROR CODE 2 + 3.
COMBUSTION AIR INDUCER OFF, IGNITOR OFF.
SIGNAL HOLDS UNTIL IGNITOR IS REPLACED
OR RECONNECTED,
STATUS ERROR CODE 4 + 7.
IS VOLTAGE ABOVE 90 VOLTS?
.o_
COMBUSTION AIR INDUCER OFF, IGNITER OFF.
SIGNAL HOLDS UNTIL VOLTAGE RISES ABOVE 95
VOLTS, STATUS ERROR CODE 4 + 8.
GAS VALVE OFF. COMBUSTION AIR Lt _r
INDUCER ON. INDOOR BLOWER OFF.
I
STATUS LED -- HEARTBEAT.
HAS CONTROL FAILED TO SENSE
FLAME FOR FIVE CONSECUTIVE TRIES NO
DURING A SINGLE HEAT DEMAND?
YES lr
WATCHGUARD MODE. GAS VALVE OFF,
COMBUSTION AIR INDUCER OFR
INDOOR BLOWER OFF.
STATUS ERROR CODE 4 + 1.
IS 60-MINUTE RESET PERIOD COMPLETE?
YES _
HAS CONTROL RESET IGNITION SEQUENCE
FOUR (4) TIMES?
WATCHGUARD MODE,
STATUS ERROR CODE 4 + 3.
I
J
I
YES
NO
Page 45

Lennox G60UHV Series Specifications

General

Brand	Lennox
Model	G60UHV Series
Category	Furnace
Language	English