ICM Controls SC 2311 Installation, Operation & Application Manual page 16

SimpleComfort
Rheem/Ruud: -PGB, -PFA, -PCB, -PLA, and -PKA Series Heat Pump Systems
Note 1: L terminal on PCB capped
24 VAC, return
R
24 VAC, common
X
Reversing valve (heating mode)
B
Compressor contactor
Y
2nd stage heating circuit
W2
Fan contactor circuit
G
Emergency heating circuit
E
System monitor LED
L

2311 Electronic Thermostat Conversion to:
®
SC 231 1
Electronic Thermostat
W1
R C Y W2
O/B
(capped)
E G