Residential HVAC Wiring Guides for Thermostats

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Below are the wiring guides for the more common thermostat systems.

 

Single Stage Cool, Electric Heat
C – Common Terminal – Connect if available

Y1 – Compressor

G – Fan

W2 – Not Used

W1/B – Heat

Y2/0 – Not Connected

RC – Power – Should be jumped to RH

RH – Power – Should be jumped to RC

 

Single Stage Cool, Gas Heat

C – Common Terminal – Connect if available

Y1 – Compressor

G – Fan

W2 – Not Used

W1/B – Heat

Y2/0 – Not Connected

RC – Power – Should be jumped to RH

RH – Power – Should be jumped to RC

 

2 Stage Cool, Electric Heat

C – Common Terminal – Connect if available

Y1 – Compressor

G – Fan

W2 – Not Used

W1/B – Heat

Y2/0 – 2nd Stage Cool

RC – Power – Should be jumped to RH

RH – Power – Should be jumped to RC

 

Single Stage Cool, Oil Heat(millivolt system)

C – Common Terminal – Connect if available

Y1 – Compressor

G – Fan

W2 – Not Used

W1/B – Heat

Y2/0 – Not Connected

RC – Power – Should be 24VAC source from unit

RH – Power – Should be millivolt source from unit (separate from cooling power)

 

Single Stage Cool, 2 Stages Heat – Energized on Heat

C – Common Terminal – Connect if available

Y1 – CompressorG – Fan

W2 – 2nd Stage Heat (Electric)

W1/B – Energized with Heat

Y2/0 – Not Connected

RC – Power – Should be jumped to RH

RH – Power – Should be jumped to RC

 

Single Stage Cool, 2 Stage Heat – Energized on Cool

C – Common Terminal – Connect if available

Y1 – Compressor

G – Fan

W2 – 2nd Stage Heat (Electric)

W1/B – Not Connected

Y2/0 – Energized on Cooling

RC – Power – Should be jumped to RH

RH – Power – Should be jumped to RC

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