Wiring
24VAC
Common
Single-Transformer
System:
Conn
ect the common side of the transformer to the C screw terminal of the thermostat
wallplate. Leave the metal jumper wire in place between RC and R.
Two Transformer System:
Connect power side of "Cooling" transformer to RC terminal. Remove factory installed
jumper. Connect common side of "COOLING" transformer to the compressor contactor,
relay, etc. Connect power side of "HEATING" transformer to the R terminal. Connect
the common side of the Heat relay to the C terminal.
You can choose from three methods to power the thermostat.
Batteries only (AA alkaline).
24VAC common wire only.
24VAC common wire with battery backup (AA alkaline).
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