help wiring thermostat

8 years ago

last modified: 8 years ago

First time working on a 2 stage geothermal unit, already blew a transformer, don't want to blow another...

Primary line has R,C,G,Y1,W1
Secondary Has one Red wire running to a separate section of the geothermal as seen in bottom pic, assuming this is the auxiliary?

This is the best I can figure, what do you think?

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Comments (5)

HU-279670720
Original Author
8 years ago
the bottom left image with the red wire labeled aux? is a 24v terminal, that being said where should it go on the thermostat base plate?
HU-279670720
Original Author
8 years ago
rc?
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HU-279670720
Original Author
8 years ago
it was the "0"
weedmeister
8 years ago
Your colors are weird. But lets just list the (non)standard ones:

Red = Power

Green = G Fan

Yellow = Y Compressor (this can be AC or Heat in a heat pump system)

White = W Heat

Blue = O/B Reversing valve (for a heat pump system).

Something Else (Black maybe)= W2 Auxiliary Heat for a heat pump, or 2nd stage heat

Something Else (Orange maybe) = Y2 2nd stage cooling

Rc is for cooling systems that are separate and distinct from a heating system. Hence two transformers. Normally, R(h) and Rc are shorted together, which is probably what is going on when it says '1 WIRE'.

What do you mean by 'aux'?
weedmeister
7 years ago
Year old.