Posted by DH in Carolina on June 26, 2010 at 15:55:45 from (173.212.14.191):
In Reply to: House Central A/C posted by John in La on June 26, 2010 at 15:06:48:
There is no way to tell you what the normal reading would be without knowing outdoor temp, indoor temp, liquid line temp, or superheat. There should be a charging chart on the inside cover of the outdoor unit. Unless you know what you are doing and have the necessary test insturments you will probably do more harm than good by putting a set of gauges on the unit. I am not saying that you don't know how to check one but every time you remove a gauge hose you lose some freon. I would say that the unit may be slightly undersized for your house is why it runs all the time. A guesstimation of pressures would be: Indoor temp of 72 degrees- suction pressure 72-76 degrees. Outdoor temp of 95degrees head pressure around 220-230 degrees. With the new higher seer units you cannot guess. You have a 13 seer unit. The newer units are charged by weight for a matching air handler and outdoor unit, plus length of the lineset. DH
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