heat pump cool only

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

Originally Posted by Pricer Air

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?

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

Originally Posted by pecmsg

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”

Originally Posted by Snapperhead

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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