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Old 05-29-2010, 03:08 PM   #1
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How Long Do I Run Central Air Before Testing?


I have read that in a Central Air unit that has enough Freon, the supply temperature should be 20 degrees Fahrenheit colder than the return air.

When I have run my unit for 15 minutes the supply air at the first duct connected to the unit about 3 feet away is 65 degrees when the return air is 80 degrees.

Do I need Freon or do I need to run the unit longer before testing the temperatures?

TIA

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Old 05-29-2010, 03:16 PM   #2
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How Long Do I Run Central Air Before Testing?


You are getting 15 deg cooling and a lot of units run at 16 deg so you are borderline. You may need freon and also the evaporator coil and condensor coils should be cleaned and inspected. Dirty coils will reduce your cooling. A worn out compressor will lose cooling as well. Need a Pro to check the freon level and compressor pumping ability.

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Old 05-29-2010, 03:36 PM   #3
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How Long Do I Run Central Air Before Testing?


Depends on how hot it was outside too.
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Old 05-30-2010, 05:01 PM   #4
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How Long Do I Run Central Air Before Testing?


Thanks for the replies.

Outside temp was around 80 also.

Outdoor coils look clean.

Unit is only about 5 years old and was not used much by previous homeowner.

I guess I'll have to get the freon level checked.'

Does anyone know whether there is a filter inbetween these two units
G2FD042H21G and
RBHA-21A00NHEA
?

Thanks.
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Old 05-30-2010, 05:07 PM   #5
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How Long Do I Run Central Air Before Testing?


You got a York coil and a Rheem air handler.

Should be before the coil.
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Old 05-30-2010, 05:25 PM   #6
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How Long Do I Run Central Air Before Testing?


Okay, so then there is only one filter and it is at the air return grating that feeds air to the coil.

The previous owner led me to believe that there was a second filter inbetween the coil and the air handler, but the only way that I could get to it was to unscrew a plate that covers the junction of the coil to the air handler. It just seemed unlikely to me that a person would have to do that for a maintenance item like a filter. I'm glad I asked and I'm glad you responded.

Thanks again.
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Old 05-30-2010, 06:13 PM   #7
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How Long Do I Run Central Air Before Testing?


It should be set up coil then blower in the direction of air flow.
If its a scabbed together system. No telling what they did.
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Old 05-31-2010, 11:00 AM   #8
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How Long Do I Run Central Air Before Testing?


Thanks beenthere.

It looks like: a grate covered filter (where air goes into the units) connects to the coil which is bolted to the airhandler which supplies cool air to the ducts in each room. So it seems correct based on your description.

With Appreciation,
FixingEverythin

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