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Ruud achiever heat pump

Brand new heat pump just installed all wiring is correct high voltage and low voltage but while its in cooling mode the back up heat is running. Why is the back up heat coil coming on while the heat pump is in cooling mode?

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  • quickair Jun 15, 2008

    Yea i wired it myself the b terminal is a direct wire from the stat and to the heat pump y to y r to r g to g purple is aux heat that links from the heat pump to white on air handler. While in cooling mode I tested the heat pump I had 24v at the r terminal 24v at the y terminal and no power to the b terminal but still the back up heat is running while the stat is calling for cooling. the suction line is sweating the status light on the heat pump is reading normal operation.

  • Anonymous Mar 28, 2009

    My Ruud heat pump fan is not running, air temp is 30F and it is snowing, compressor is running. Is this ok and normal or should the fan run anytime the system is operating.

  • Anonymous May 15, 2009

    Hello
    I got new Ruud heat pump installed and run good on a/c when system stop after cycle unit outside make some noise for 10 sec Is that normal ?

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If back-up heat comes on when a/c is turned on and then the back up heat turns off shortly after the a/c turns off, then the low voltage wiring is NOT correct. Your "R" terminal is basically your "hot" and your "C" terminal is basically your "neutral" to simplify explanation. The Furnace supplies the "R" power to the thermostat and then depending on what wire the thermostat sends the power back on determines what the system does. The thermostat terminals are as follows "G" is fan, "W" or "aux" is elect heat, "Y" tells the outdoor unit to run, "O" or "B" tells the outdoor unit whether it is heating or cooling, and "E" is emergency heat. "G" should connect from the t-stat directly to the furnace and go no further. "W" or "aux" AND "E" should both connect to your "W" or "W1" terminal in the furnace, there should also be a "W" connection to the heat pump ( this allows the H/P to turn on the elect heat when the unit defrosts) "Y" and "O" or "B" may or may not connect to a terminal in the furnace, usually they just pass through the furnace from the t-stat to the H/P and get wire nutted in the furnace. Now, here is the key. As I mentioned previously "O" or "B", a system will only use one or the other. The entire industry (except for Rheem and Ruud) uses the "O" terminial which has 24v on it when you are cooling and no power when you are heating. Rheem and Ruud use the "B" terminal which is just backwards, 24v in heating and no power in cooling. this could also be your problem if the t-stat thinks it is telling the H/P to cool but the H/P is actuall interpreting the signal to heat. Check your amp draw on the furnace, if you have anything drawing 15 amps+ then it is most likely the actual elect heat running, if not then check the "B" terminal. Most universal t-stats come set from the factory to use the "O" terminal which is more common. Usually this can be changed in the installer setup menu on the stat or sometimes the stat will have separate "O" and "B" terminals

Posted on Jun 15, 2008

  • Chris Lyon
    Chris Lyon Jun 15, 2008

    Okay, then the next thing is do you have 24v at w in the furnace if not, then check the sequencer that controls the elements, use an amp clamp to find out which elements are on and the check that sequencer. If you have power at w, look for any factory jumpers in the furnace, if no power and the sequencer is still feeding the elements, then the sequencer is bad

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Check all of the factory wiring and compare to diagram. they do mess up at the factory

Posted on Jan 08, 2010

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