Lennox G60UHV Series - Page 49

CONTINUOUSLOW SPEED FAN SEQUENCE OF OPERATION
I=
YES
I THERMOSTAT CALLS FOR FIRST STAGE COOL.
YES
I INDOOR BLOWER RAMPS TO FIRST STAGE
COOLING SPEED AFTER A 2-SECOND DELAY,
FIRST-STAGE COOL DEMAND SATISFIED?
NO_
I SECONDSTAGECOOLDEMAND I
I INDOOR BLOWER RAMPS TO SECOND
STAGE COOL SPEED
I SECONDSTAGECOOLDEMANDSAT,SFIED?I
YES
I INDOOR BLOWER RAMPS DOWN TO FIRST STAGECOOL SPEED. p
MANUAL FAN SELECTION MADE AT THERMOSTAT
AFTER 2 SECOND DELAY, INDOOR BLOWER IS
ENERGIZED ON CONTINUOUS FAN SPEED.
I I
II
I
I
I
q
ii
YES
THERMOSTAT CALLS FOR FIRST-STAGE HEAT. I
YES
AFTER 45-SECOND DELAY, INDOOR BLOWER I
SWITCHES TO LOW HEAT SPEED,
FIRST-STAGE HEAT DEMAND SATISFIED. _YI
NO
THERMOSTAT CALLS FOR SECOND-STAGE HEAT. I
YES
INDOOR BLOWER SWITCHES TO HIGH HEAT SPEED I
AFTER 30-SECOND RECOGNITION PERIOD.
YES
SECOND-STAGE HEAT DEMAND SATISFIED. I
YES
INDOOR BLOWERHEATRAMPSsPEED.DOWNTO LOW I
Page 49