heat pump cool only

[Pricer Air]

Hi:
How do I wiring a heat pump to cool only with 2 low volts cable from the air handler

[pecmsg]

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?

[Snapperhead]

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

[Snapperhead]

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"

[jbhenergy]

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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[Hurst11]

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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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. 😂

[pecmsg]

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!

[R600a]

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.

[jbhenergy]

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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