Question about Ruud UBHC Air Conditioner

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Frost on my heat pump

I've never had a heat pump before and I am wondering is there supposed to be so much frost on the "fins"? It has been heating for a couple months with our outside temps running in the 20 to 40 dogree range. House is set at 65. I just worried if it builds up too much it will fry the pump. Any info. wouuld be helpful. Thanks.

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All you are seeing is the moisture in the air outside starting to freeze on the fins there is no worries the system has a cycle time built in to check for freezing and will defrost itself if it does not thaw out it has a bad sensor or board

Posted on Nov 16, 2008

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I have a Lennex heat pump unit which was installed in 2008. Our area (Savannah, GA) has experienced some abnormal cold temps lately. Yesterday, I noticed the outside of the unit had frost on the unit. ...


Heat pumps are the same as an A/C unit only it works in reverse. Instead of blowing cold air inside and hot air outside it blows hot air inside and cold air outside. The heat being blown inside is extracted form the cold air outside. Its called Latent heat Latin for hidden. Believe it or not even though its 20 degrees outside there is still heat in the air. Example if you want to drop the temperature of a freezer from 20 to 10 degrees you have to remove heat .I know your getting unusal weather and that is the problem. Heat pumps can only work no lower then around 20 degrees outside.Heat pumps are never used above the freeze line. With your unusal temperatures thats basically where you are now. Ride it out. When your temps rise a little your be fine. Im in Chicago.

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To getproper heat, keep your temp setting at 25+ degree and also mode in "heat"position. If still no heat, check your heating sensor for closed circuit by anOHMs metre.It it's with RV, check power to RV And also check your compressor is not frosting due to -3 degree.

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Outside fins frosting over, in teens


Due to ambient temp on -. Check when you keep heat mode in your a/c the outside fan won't run unless the pressure build up. First, you defrost by heating torch or pouring hot water on your condenser. And also clean your condenser coil.

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W1 and E on stat need tied together. When W1 comes on wire where all heat elements come on. On the outside unit defrost board set the 45-60-90 to 45 and see if that takes care of the frost problem.

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On a heat pump the system reverses during the heat cycle to bring in outside heat that will cause the outside coils to ice up. There is a defrost timer or pc board to send the unit into defrost every so often. This is a common problem with heat pumps or possibly low or refrigerant. Heat pumps will freeze up at low outside temps, but unless your in the Artic right now that shouldn't be a problem.

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1 Answer

My cooper line outside on my air conditioner keeps freezing over causing my ac to blow warm air instead of cold air


The evaporator coil that is low pressure and low temperature needs an adequate supply of heat to absorb from air passing over the fins or a thin dusting of frost will begin to form further insulating the coil from the passing air and causing more ice to form. First you have to get rid of all the ice by allowing the coil to thaw you can use a heat gun or hairdryer or lamp to speed the thawing but the fins and copper tubing are thin and easily damaged so don't use tools on the coil to remove ice. After thawed the coil needs to be cleaned with an indoor evaporator cleaner ( I also use a small shopvac and nylon brush) Then be sure that the filter is clean and the blower is functioning properly then if the suction line is still frosting you will have to verify that the size of the outdoor section is not over sized in relation to the evaporator coil and that the system is charged to meet the compressors manufactures specifications.

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You are going to have to increase the amount of heat absorbed by the evaporator coil on the indoor section of your system. First change the filter. Second turn the power off to the outdoor section and leave the indoor fan running until all the ice on the evaporator coil has thawed this could take a few hours. Third you need to verify that you are getting adequate airflow across the indoor evaporator coil and the outdoor condenser coil both fans should be spinning at full speed and airflow should be unobstructed by dirty coil fins or debris Hopefully after you've done this you will have cold air blowing inside and the larger of the two lines entering the unit outside will be cool to the touch but not frozen or even frosted regardless of run time and the small one should be the slightly warm but not hot. If the larger line continues to freeze then it could indicate a number of problems but essentially your condensers cooling capacity is outrunning your evaporator coils ability to absorb heat from air stream circulating in your home.Hope it works out for you GL!

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pull cover off unit to expose the coil fins. on right side there may be a switch that turns with a screw driver that switches between heat pump and elec. heat. we use this to stop the heater from dripping water in the winter, for some people

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1 Answer

Hums and freezes up????


The fan motor must have been stopping. If the fan stops, for sure the fins will freeze because there is no air flowing. common Fan motor problems defective bearing or bushing and starting condenser. If the bearing is defective, it will heat up and seize. Have the fan motor checked. The fact that the fins are freezing, means that there is enough freon and the compressor is working.

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