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CONTINUOUS LOW SPEED FAN SEQUENCE OF OPERATION
MANUAL FAN SELECTION MADE AT THERMOSTAT.
AFTER 2 SECOND DELAY, INDOOR BLOWER IS
ENERGIZED ON CONTINUOUS FAN SPEED
(LOW HEAT / LOW COOL).
THERMOSTAT CALLS FOR FIRST−STAGE HEAT.THERMOSTAT CALLS FOR FIRST STAGE COOL.
YES
YES
BURNERS IGNITE AND INDOOR BLOWER
CONTINUES TO OPERATE IN CONTINUOUS
LOW (LOW HEAT / LOW COOL) MODE.
FIRST−STAGE HEAT DEMAND SATISFIED.
YES
NO
THERMOSTAT CALLS FOR SECOND−STAGE HEAT.
YES
INDOOR BLOWER SWITCHES TO HIGH HEAT SPEED
AFTER 30−SECOND RECOGNITION PERIOD.
SECOND−STAGE HEAT DEMAND SATISFIED.
YES
YES
INDOOR BLOWER RAMPS DOWN TO LOW
HEAT SPEED.
COMPRESSOR IS ENERGIZED AND INDOOR
BLOWER CONTINUES TO OPERATE IN LOW
COOL SPEED.
FIRST−STAGE COOL DEMAND SATISFIED?
YES
NO
SECOND STAGE COOL DEMAND SATISFIED?
INDOOR BLOWER RAMPS TO SECOND
STAGE COOL SPEED
YES
SECOND STAGE COOL DEMAND
INDOOR BLOWER RAMPS DOWN TO FIRST STAGE
COOL SPEED.
YES YES
NOTE − Continuous low speed fan and cooling low
speed are equal to the low heat fan speed.
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