Question about Ruud Heating & Cooling
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Posted on Jan 02, 2017
SOURCE: Ruud achiever heat pump
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
SOURCE: ruud heat pump
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
Hi, This sounds like it is cold enough, the ambient temperature outdoors and is bringing on the aux heat to help even at 1 degree. Nothing to be concerned about the energy you may use will be next to nothing.In the program of the stat as mentioned above, there is what they call a heat anticipator with should match the amps on a gas fired unit, and heat strip control on the heat pump. Gas setting from the factory would be at .04. Heat pump will be shown in the book. Don't even be concerned about this. Happy Thanksgiving,
Posted on Nov 26, 2009
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