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How to tell if the compressor on your ac unit is running

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If you have a split unit, it is fairly simple, just feel the small refrigerant line coming out of the unit. The temperature should be warmer than the surrounding air. If is not running the temperature will be the same as the surrounding air. If you have a package unit, take off the access cover to where the compressor is located. Find the compressor discharge piping to the the condensing coil. It is the smaller of the two major pipes on the side of the compressor. Be careful the temperature of line coming out of a properly operating compressor will be hot enough to cause second degree burns. If the line is very warm to very hot the compressor is running. If you have a set of gauges, attach the RED hose to the high pressure service connection and the other low pressure hose BLUE to the bigger pipe low pressure connection. Make sure the gauges are isolated by shutting the valves. The pressure difference between high and low pressure is normally at least 150 psig diference.

Posted on Oct 14, 2014

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Compressor on ac unit


It could be a relay for the compressor is sticking in the run position.
If it is only about one week old take it back to the dealer for service or call them and tell them your problem. This should be covered by warranty and the dealer can refer you to someone authorized to do the work.

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