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Thread: heat pump cool only

  1. #1
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    Question heat pump cool only

    Hi:
    How do I wiring a heat pump to cool only with 2 low volts cable from the air handler
    Last edited by Pricer Air; 08-14-2022 at 04:52 AM. Reason: mispelling

  2. #2
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    Quote Originally Posted by Pricer Air View Post
    Hi:
    How do I wiring a heat pump to cool only with 2 low volts cable from the air handler
    You’d listed as a contractor?

  3. #3
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    What Brand is the Outdoor Unit ?

    Most manufacturers energize the "Reversing Valve" on Cooling mode (Rheem & Ruud , maybe Ameristar , energize in "Heat") If the unit has an "O" terminal on the Board it means the Rev Valve energizes in Cooling , so it must get power when AC is needed , and if the unit has "B" means the Rev Valve energizes in Heating which means it wont need power at all, because its already in Cooling mode

    (Although sometimes B can be "common" on older units, so follow your wires to see where they go)

    So if your unit energizes in cooling "O" .... you just wire "O" to come on with "Y"

    We cannot give you any more information about wiring ... that is all you get
    Tell your Cat I said "Psst Psst Psst"

  4. #4
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    Quote Originally Posted by pecmsg View Post
    You’d listed as a contractor?
    Dude ... I know 2 contractors who are TERRIBLE when it comes to wiring

    Granted both are Foreigners

    1 called me last week "how do I bypass the door switch"
    Tell your Cat I said "Psst Psst Psst"

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  6. #5
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    Quote Originally Posted by Snapperhead View Post
    Dude ... I know 2 contractors who are TERRIBLE when it comes to wiring

    Granted both are Foreigners
    Maybe is resi comfort cooling adopted common wire colors it would be better.

    Did some amistar units (supplied by building owner) and they used purple wire for the w signal. Like really. Purple….
    And they used black wire to the common term where I see most people use blue.


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  8. #6
    Hurst11 is offline Professional Member/Membership Committee
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    Quote Originally Posted by jbhenergy View Post
    Maybe is resi comfort cooling adopted common wire colors it would be better.

    Did some amistar units (supplied by building owner) and they used purple wire for the w signal. Like really. Purple….
    And they used black wire to the common term where I see most people use blue.


    Sent from my iPhone using Tapatalk
    I say make em all black wires and do away with color coding, would force people do pay closer attention to what’s going on. 😂

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  10. #7
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    Quote Originally Posted by Hurst11 View Post
    I say make em all black wires and do away with color coding, would force people do pay closer attention to what’s going on. 😂
    and how to use a Meter!

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  12. #8
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    R600a is online now Professional Member*/Membership Committee
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    Quote Originally Posted by Hurst11 View Post
    I say make em all black wires and do away with color coding, would force people do pay closer attention to what’s going on.
    White with tiny letters like Carrier used to use.
    "Is this before or after you fired the parts cannon at it?" - senior tech
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  13. #9
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    Seen Trane rtus with all black wires and tiny white numbers. Not all the bad really. Find your part in the diagram and then look and see you need wire 423 and 424….


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