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Question

I have and old Honeywell thermostat (mercury) and want to replace it with an electronic thermostat. I have a conventional HVAC system air compressor/gas heat/fan/duct system. The wires connected are labeled on the existing thermostat as Green Yellow White and Red. I need to know what the colors correspond to as far as Y1/Y2, W1/W2, etc. Can you help?

Submitted: 22 days and 1 hours ago.
Category: HVAC
Value: $15
Status: CLOSED

Accepted Answer

Hi,

 

green is the fan G

 

red is power R , Rc or RH, tie all R terminals together.

 

white is heating W1

 

yellow is cooling Y1

 

You will not use W2 or Y2,

 

Thanks

 

Mark

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Expert: Mark Henley
Pos. Feedback: 99.2 %
Accepts: 
Answered: 11/2/2009

Journeyman Technician

UA Journeyman Pipefitter , HVAC, Refrigeration, DDC controls. 26 years.Commercial & residential

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