Installation Manual

Installer Guide 4
Wiring Terminations for model 5220
Connecting Your Wires (continued)
3
Terminal Function Description
Rc Input 24 Volt AC Cooling Transformer
(Dual Transformer Systems Only)
Rh Input Power Connection (24 Volt AC Heating
Transformer or Millivolt Power Source)
G Output Fan Control
W1 / E / W3 Output (W1) 1st Stage Conventional Heat,
(E) Emergency Heat,
(W3) 3rd Stage Auxiliary Heat
W2 Output 2nd Stage Conventional Heat
O / B / V3 Output (O) Cool Active Reversing Valve
(B) Heat Active Reversing Valve
(V3) Zone Valve Power Close
Y1 Output 1st Stage Compressor
Y2 Output 2nd Stage Compressor
L Input System Malfunction Indicator
C Input 24 Volt AC Transformer Common
S1
S2
Input Optional Remote Sensor (indoor or outdoor)