Installing digital thermostat

Discussion in 'HVAC' started by crabman531, Feb 27, 2012.

  1. Feb 27, 2012 #1

    crabman531

    crabman531

    crabman531

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    I'm trying to install a TempRite digital thermostat, replacing a 20-some-year-old mercury one. The house runs on a heat pump in the attic, with an A/C unit outside.
    Attached is a picture of the old themostat...my problem is, from this picture I'm not sure which wires are supposed to go where on the new stat. I've also attached a page in the new stat's manual which assigns labels to the functions of the old stat's wires (these labels I tag on the wires with stickers).
    Based on both pictures, can anyone please take a stab at what labels I might attach to the old stat's wires? Thanks in advance.

    manual.jpg

    stat.jpg
     
  2. Feb 27, 2012 #2

    crabman531

    crabman531

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    (Would delete this second post if able, accidentally posted picture twice)
     
    Last edited: Feb 27, 2012
  3. Feb 27, 2012 #3

    kok328

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    what is the make of the heat pump and can you remove the base plate for the old stat and post a pic of the remaining wires coming out of the wall?
     
  4. Feb 29, 2012 #4

    crabman531

    crabman531

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    Thanks for responding. Heat pump is Lennox GS18Q3-75-8. Photo attached.

    thermo-wires.jpg
     
  5. Feb 29, 2012 #5

    kok328

    kok328

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    Connect the wires coming out of the wall to the terminals on the new stat.
    Wire Terminal
    Red RH
    Green G
    Yellow Y
    White W

    However, this wires coming out of the wall do not appear to be typical combination of heat pump wires.
     
  6. Mar 4, 2012 #6

    crabman531

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    Worked well after moving around a couple jumpers on thermostat (not shown)... thank you!
     

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