Question about Ruud UAMB Air Conditioner

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Ruud heat pump

Condenser does not come on. select cool on tstat then egage contactor ht pump mode comes on then select heat at tstat push contactor in cool mode. tstat is a braeburn furnace is coleman and condenser ruud. I am pretty confident low voltage is wired correctly. W/ a response i can give more info, help please, sincerely

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  • The HVAC Guy
    The HVAC Guy May 11, 2010

    from what i can understand from the post you have to manually push in the contactor to get it to run is that correct?

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Did you just install this heat pump? If so it sounds like you replace a regular a/c with a heat pump, which will require more wires for the reversing valve. First check to make sure you have 24v going to the condenser. Make sure you have a heat pump t-stat. You should have a orange t-stat wire for your reversing valve. At the t-stat you will have terminals R, Y, G, O, X or C or B, W1, and W2. R is half of your 24v circuit and is a red wire, Y is for cooling mode, G is the Fan green wire, O is for the reversing valve, orange wire, X or C or B is the other half of control circuit blue wire, W1 and W2 is the heat strips in the furnace tan and black wires. These are standard color code but remember electricity does not know colors and an installer may have used different colors. If all of this is correct possibly bad contactor.

Posted on Oct 31, 2008

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If I understand what you are saying, when your stat calls for cool the unit blows heat and when in heat mode it blows cool. Is this correct?

The problem is on a Ruud unit it does not use an "O" terminal it uses a "B" terminal (Reversing valve energized for heat) where all others use the "O" energized for cool mode.

As for the contactor not closing you need to determin if there is 24 volts between "Y" and "C" at the unit, if not then there is an issue somewhere up the line interupting the voltage, if there is then the fault lies at the unit, defrost boaard or pressure switch. call me and we can diagnose over the phone, this is what I do.

Richard (Rick) Drennan
Global HVAC Distributors
RUUD Field Support Representative / Instructor
rdrennan@globalhvac.com
900 Spreckels Ave
Manteca, Ca. 95336
Office (877)448-7263
Cell (209)456-0513

Posted on Jan 05, 2009

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