Question about Heating & Cooling
Its all relative to the ambient temperature, the hotter it is the higher the pressure. The best way to check for proper freon charge is to take the suction line temperature about 12" from the compressor. Convert the reading from pressure to the temp on the the low gauge band for R-22. Ideally, there should be a 20 degree difference between the two temperatures, this is called "superheat". First make sure the blower fan is on high speed (the black wire) and the air filter is new. The suction or low side pipe should have some sort of insulated wrap on it. Also the evaporator and condenser coils must be clean as well and unobstructed, all these can effect the reading of the gauges. Got it? Good luck. And people wonder why HVAC techs charge so much for their services.
Posted on Jul 08, 2008
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Posted on Jan 02, 2017
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