ICM Controls SC 2811 Installation, Operation & Application Manual page 23

SimpleComfort
Lennox HP22 With CB19 PCB Heat Pump Systems
Note 1: E terminal on PCB capped
Note 2: L terminal on PCB capped
24 VAC, return
R-VR
24 VAC, common
X
Reversing valve (cooling mode)
R
Compressor contactor
M
2nd stage heating circuit
Y
2nd stage cooling circuit
Y2
Fan contactor circuit
F
Emergency heating circuit
E
System monitor LED
L
2811 Electronic Thermostat Conversion to:
®
SC 281 1
Electronic Thermostat
W1
R C Y1 W2 Y2
O/B
(capped)
(capped)
G W3