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    thermostatMA's Avatar
    thermostatMA Posts: 2, Reputation: 1
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    #1

    Dec 9, 2008, 02:50 PM
    Thermostat change from carrier to honeywell
    I need to change a carrier (Y841A 1647 HH07AT215 class 2) thermostat to a honeywell (TH4210D - 2 heat/1cool heat pump). I can't find the wiring diagram for the carrier thermostat. I need to identify what terminal (and color wire) and function on the carrier corresponds to the honeywell.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Dec 9, 2008, 04:33 PM
    Quote Originally Posted by thermostatMA View Post
    I need to change a carrier (Y841A 1647 HH07AT215 class 2) thermostat to a honeywell (TH4210D - 2 heat/1cool heat pump). I can't find the wiring diagram for the carrier thermostat. I need to identify what terminal (and color wire) and function on the carrier corresponds to the honeywell.

    Look at this. Look at BDP or Carrier for help with wire. Do not worry about color use the letter or number where the old wire is placed on the old thermostat to go to the new..
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  1. File Type: pdf heat pump wiring.pdf (13.3 KB, 1371 views)
    2. thermostatMA's Avatar
    thermostatMA Posts: 2, Reputation: 1
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    #3

    Dec 11, 2008, 10:23 AM
    Quote Originally Posted by hvac1000 View Post
    Look at this. Look at BDP or Carrier for help with wire. Do not worry about color use the letter or number where the old wire is placed on the old thermostat to go to the new..
    Thank you. Another question: will the carrier terminals (letter where wire is attached) match the honeywell lettering? For example, the carrier lettering is E G Y O R W2 C whereas the honeywell lettering is E Aux Y G O L R B C. So what letter corresponds to what? Is the following correct? E-E G-G Y-Y O-O L- leave blank R-R W2-Aux C-C B-leave blank.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #4

    Dec 11, 2008, 10:34 AM
    That is why I posted the heat pump change over wiring diagram. Some letters/colors might use a different designation/letter/color.

    The only true way to make sure all is absolutely correct is to trace all the wires down,see where they go, and pick the correct post to land the wire on. This is what professionals do many times when there is a question with thermostat wiring. I supplied you the cheat sheet to help you prevent having to do that.
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