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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)
O Output Reversing Valve (Cool Active)
B Output Reversing Valve (Heat Active)
Y1 Output Compressor Relay
G Output Fan Control
W1 Output Conventional Heat Relay
C Input 24 Volt AC Transformer Common
Connect Your Wires
3
Wiring Terminations
Terminal Function Description
W1/E Output (W1) 1st Stage Conventional Heat
(E) Emergency Heat Relay
W2 Output 2nd Stage Heat / Auxiliary Heat
Additional Terminations (2220NC only)
Provide Power
• For 24 Volt AC power, you must connect the common side of the trans-
former to the C terminal on the thermostat sub-base.
• For primary or back-up power, insert the 2 supplied “AA” type alkaline
batteries into the battery compartment located in the rear housing of the
thermostat. Make sure to position the Positive (+) and Negative (-) sides
of the batteries correctly with the +/- symbols in the battery compartment.
24VAC Power
Terminal (C)
2
C
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