AccuAir AS7812 Installation, Operation & Application Manual page 11

Cool Active
Reversing Valve
Transformer
HOT
120 VAC 24 VAC
Compressor
Contactor
Reversing
Valve
Fan
Relay
Note: Place jumper between "W" and "Y" terminals.
Place heat pump jumper to HP position.
Heat Pump
Reversing Valve
R
Transformer
T
HOT
C
H
120 VAC
E
W
R
M
Y
O
S
B
T
A
O
T
G
Heat Active
R
T
C
H
24 VAC
E
W
R
M
Compressor
Y
O
Contactor
S
Reversing
B
T
Valve
A
O
T
Fan
G
Relay
Cooling Only
4-Wire
Single Transformer
Transformer
HOT
120 VAC 24 VAC
Cooling
Control
Fan
Control
Note: Millivolt system may require a
transformer and/or an isolation
relay to operate properly
R
T
C
H
E
W
R
M
Y
O
S
B
T
A
O
T
G