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How to hook up Honeywell rth 7600. have an extra wire

Ooking up a Honeywell rth7600 to a heat pump.
old wires (from ancient mercury tstat)
b= brown,
w2= white ,
o= orange,
x= blue,
r=red ,
y=yellow,
g=green,
e= blk and ialways seem to end up with an extra wire.
assuming that o,r,y and g arematching ....
b is then supposed to go to c.
aux = w2 (white),
e = e,
c = x orb

and i end up with both. ?? the manual then says to STOP EVERYthing and call a local contractor. ??

thanks!

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  • Thomas Woodburn
    Thomas Woodburn May 13, 2017

    Sorry, I found it. Brown was your common it should go to c. White and Blue will go to aux. The blue is the signal from the heat pump that it is in defrost. White goes to the actual heat strips. These should go together.

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  • Master
  • 1,202 Answers

From what I'm seeing the 7600 is not compatible with a heat pump. Where are you landing the orange wire?

Posted on May 12, 2017

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SOURCE: i have a honeywell focus

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Sorry Iasumed you had a heat pump t-stat. You will need to exchange to a heat pump t-stat

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Blue (C) or sometimes (B) should be your common wire. Look at your schematics and locate common. Your Brown wire is (E) and is emergency heat, white wire (W) is Auxilary Heat, green wire (G) is fan relay, red wire (R) is power, yellow wire (Y) is Cooling and orange wire (O) is reversing valve.

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SOURCE: i need a wire diagram of a central heat and air with a heat pump

W- White (heat)
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O/B (Only needed if system is a heat pump)

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my weathertron heat pump stopped putting out heat

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