Lennox SL280UHNV Series Unit Information page 53

Troubleshooting: Continuous Fan Sequence of Operation
CALL FOR FAN
1
CALL FOR FAN
INDOOR BLOWER ON
CONTINUOUS FAN
SPEED
NO
CALL FOR FAN
MAINTAIN INDOOR
REMOVED?
BLOWER AT
CONTINUOUS FAN
YES
REQUEST
YES
MAINTAIN INDOOR
FOR COOLING
BLOWER AT
RECEIVED?
CONTINUOUS FAN
NO
REQUEST
MAINTAIN INDOOR
YES
FOR HEAT
BLOWER AT
RECEIVED?
CONTINUOUS FAN
NO
DE-ENERGIZE INDOOR
BLOWER
1
Page 53
4 GO TO CALL FOR COOLING
1
GO TO CALL FOR 1ST STAGE HEAT
1 - If continuous fan is active, unit will light and run at high fire
for 60 seconds to improve heat exchanger warm up.
1