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Old 06-17-2010, 06:49 PM   #1
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Help with Air Conditioner!

I am having what I believe are problems with my apartment's air conditioning unit, but the maintenance people keep telling me everything is fine. It is really frustrating and I would appreciate if you guys could give me information that I can tell them so that I can get a competent tech out here.

Here is my equipment: National Comfort Products 10 SEER, 1.5 ton condenser, Goodman GMP050 Furnace with Goodman U-29 Coil with R22 refrigerant. The apartment is 700 square feet.

The main problem is that the unit does not cool the apartment. I consistenly read temperature splits of 7 to 10 degrees F, depending on how hot/humid it is outside. I get 10 degrees when its 70 out and 7 when its 85 out. The supply vent is literally six feet from the evaporator coil. Am I incorrect in expecting better temperature splits?

The suction line does not have condensation on it and the dewpoint is normally in the 60's. When the guy came out, he hooked up some guages to check the charge and said, "It was reading 58 and a normal charge is from 60 to 90, so I added a little, but it seems ok." Does this seem right to you?

Thanks for your input here.


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Old 06-17-2010, 07:08 PM   #2
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The "guy" does not know what he is doing. There is a lot to properly charging an air conditioner. He should be doing it with proper readings and using a superheat or subcooling method. Doubt if he knows how. Read from page 22 and on in this Lennox manual for what is expected.

Sounds like it is low on freon. Should get at least 14-15 deg temp split or better.

Good Luck


"Cut it twice and it is still too short".
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Old 06-17-2010, 07:28 PM   #3
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Yep. he is out to lunch when it comes to knowing how to check an A/C.
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