Lennox DAVE SIGNATURE SL280DFV Installation Instructions Manual page 55

Troubleshooting: Cooling Sequence of Operation
CALL FOR COOLING
1ST STAGE COOLING
REQUEST RECEIVED
WAIT FOR COMPRESSOR TIMED
ENERGIZE INDOOR BLOWER
(LOW COOLING MODE)
ENERGIZE 2ND STAGE
COOLING CONTACTOR
(COMPRESSOR & FAN)
DE−ENERGIZE INDOOR
1
1
OFF DELAY TO EXPIRE
ENERGIZE 1ST STAGE
COOLING CONTACTOR
(COMPRESSOR & FAN)
INDOOR BLOWER 2
SECOND ON DELAY
2
MAINTAIN INDOOR
BLOWER
(LOW COOLING MODE)
1
2ND STAGE
NO
COOLING
REQUEST?
YES YES
ENERGIZE INDOOR BLOWER
(HIGH COOLING MODE)
2ND STAGE
MAINTAIN INDOOR BLOWER
COOLING REQUEST YES
STILL ACTIVE?
NO
DE−ENERGIZE 2ND
STAGE COOLING
CONTACTOR
(COMPRESSOR & FAN)
1ST STAGE
ENERGIZE AND MAINTAIN
COOLING REQUEST YES
STILL ACTIVE?
NO
DE−ENERGIZE 1ST
STAGE COOLING
CONTACTOR
1
CONTROL WILL NOT RESPOND TO A 2ND STAGE COOLING REQUEST UNLESS A 1ST STAGE
(COMPRESSOR & FAN)
COOLING REQUEST IS ACTIVE.
INDOOR BLOWER LOW COOLING MODE AND HIGH COOLING MODE HAVE SPECIFIC ON, OFF
2
AND SPEED RAMPING PROFILES. THE SPECIFIC PROFILE IS SELECTED USING THE
2
BLOWER
DIP SWITCHES ON THE CONROL.
1
YES
YES
1ST STAGE
COOLING REQUEST
STILL ACTIVE?
2
NO
(HIGH COOLING MODE)
INDOOR BLOWER AT
(LOW COOLING MODE)
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