ICM Controls SC 2000 Installation, Operation & Maintenance Manual page 13

3-Wire, Single Transformer
Transformer
HOT
120 VAC 24 VAC
Heating Only
Remove
Pre-Installed
Jumper
RH
RC
T
H
Heating
E
W
Control
R
M
Y
O
S
T
B
A
T
O
Fan
G
Control
2-Wire, Single Transformer or Millivolt
Thermopile
or
Transformer
Heating
Control
Remove
Pre-Installed
Jumper
RH
RC
T
H
E
W
R
M
Y
O
S
T
B
A
T
O
G