T
H
E
R
M
O
S
T
A
T
R
C
Y
G
W
B
O
T
H
E
R
M
O
S
T
A
T
R
C
Y
G
W
B
O
T
H
E
R
M
O
S
T
A
T
R
C
Y
G
W
B
O
24 VAC
120 VAC
HOT
Transformer
24 VAC
120 VAC
HOT
Transformer
24 VAC
120 VAC
HOT
Transformer
Fan
Relay
Fan
Relay
Fan
Control
Cooling
Control
Compressor
Contactor
Reversing
Valve
Compressor
Contactor
Reversing
Valve
Heat Active
Reversing Valve
Cool Active
Reversing Valve
4-Wire
Single Transformer
Place jumper between “W” and “Y” terminals.
Millivolt systems may require a
transformer and/or an isolation
relay to operate properly.
Heat Pump
Cooling Only
Содержание SC 2001
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