ICM Controls SC 2000 Installation, Operation & Maintenance Manual page 14

Cool Active
Reversing Valve
Pre-Installed
Jumper
Transformer
RH
HOT
RC
120 VAC 24 VAC
Compressor
Contactor
Reversing
Valve
Fan
Relay
Note: Place jumper between "W" and "Y" terminals.

Heat Pump
Heat Active
Reversing Valve
Transformer
HOT
T
120 VAC
H
E
W
R
M
Compressor
Y
O
S
Reversing
T
B
A
T
O
G
Pre-Installed
Jumper
RH
RC
T
24 VAC
H
E
W
R
M
Y
Contactor O
S
T
B
Valve
A
T
O
Fan
G
Relay
Cool Only
3-Wire,
Single Transformer
Remove
Pre-Installed
Jumper
Transformer
RH
HOT
RC
120 VAC 24 VAC
W
Cooling
Control
Fan
Control
Note: Millivolt system may require a
transformer and/or an isolation
relay to operate properly
T
H
E
R
M
Y
O
S
T
B
A
T
O
G