CALLFOR COOLING
1st Stage Cooling
Request Received
Energize 1st Stage
Cooling Contactor
Compressor & Fan
A_tned°2°-rseE_c°W_rdO'naYI
Energize Indoor Blower
A_
Per
Ramp ng Prof e z_\
4 YES
_'_YES-- --YES'_
Energize 2nd Stage I ,[Energize Indoor BlowerCooling Contactor I (High Cooling mode)
(Compressor & Fan) NO
I I
_ES__%n:%_,dn;':&%er1
NO
÷
De-Energize 2nd I
Stage Cooling I
Contactor
(Compressor & Fan)l
Energ,zeand,
MaLnt:nclonodiOlCgrB_oOdVratJ
NO
l'
De-Energize 1st I
Stage Cooling I
Contactor
(Compressor & Fan)I
!
IDe-Energize'nd°°rBl°wer
Per Ramping Profile
2nd stage cooling operation requires a 2-stage thermostat, a 2-stage cooling system and
on-board link 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.
Page 64
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