R – 24 VAC hot
C – 24 VAC common
W1/O/B – Configurable
W1 – 1st stage heat for non-heat pump systems
O – cool active reversing valve
B – heat active reversing valve
Y1 – 1st stage cool, 1st stage heat for heat pumps
W2 – 2nd stage heat for non-heat pump systems
Y2 – 2nd stage cool for 2 compressor systems, 2nd stage heat for 2 compressor heat pump systems
G – Fan
Terminal Designator Descriptions
1
ST
Cool
2
ND
Cool
1
ST
Heat
2
ND
Heat
Heat/Cool
Y1,G
YI,Y2,G
W1,G*
W1,W2,G*
Heat Pump (One Compressor)
Y1,G,O
Y1,G,O
Y1,G,B
Y1,W2,G,B
Heat Pump (Two Compressors)
Y1,G,O
Y1,Y2,G,O
Y1,G,B
Y1,Y2,G,B
Emergency Heat (Heat Pump Only)
N/A
N/A
W2,G
W2,G
* G not energized when configured as a gas/oil system
The SC4811 thermostat is configurable for all systems . The configuration directly affects the outputs .
Use the output chart to correctly configure and wire the thermostat to your system .
SC4811 Output Chart
