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CALL FOR COOLING
1st Stage Cooling
Request Received
Energize 1st Stage
Cooling Contactor
(Compressor & Fan)
2nd Stage
Cooling
Request?
YES
2nd Stage
Cooling Request
Still Active?
De
−
Energize 1st
Stage Cooling
Contactor
(Compressor & Fan)
YES
1st Stage
Cooling Request
Still Active?
NO
YES
YES
Energize 2nd Stage
Cooling Contactor
(Compressor & Fan)
1st Stage
Cooling Request
Still Active?
De
−
Energize 2nd
Stage Cooling
Contactor
(Compressor & Fan)
Energize and
Low Cooling mode
(High Cooling mode)
(High Cooling mode)
Per Ramping Profile
NO
NO
YES
NO
5
1
2
1
2
2
2
1
Indoor Blower On
After 2
−
second delay
Energize Indoor Blower
(Per Ramping Profile)
Energize Indoor Blower
Maintain Indoor Blower
Maintain Indoor Blower at
De
−
Energize Indoor Blower
2nd stage cooling operation requires a 2
−
stage thermostat, a 2
−
stage cooling system and jumpers
W915 must be be cut. The control will not respond to a 2nd stage cooling request unless a 1st stage
cooling request is active
Indoor blower cooling mode and high cooling mode have a specific ON, OFF and speed ramping
profiles. The specific profile is selected using the DIP switches on the control.