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Old 06-27-2011, 09:19 PM   #1
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Cold Refrigerant Line...Warm Supply


I've got a York, 2 ton, A/C system that handles my 3rd and 4th floors of my town house. Rooms were mild at the beginning of summer with air supply coming out at 68 to 70 degrees.

Technician came a few days ago and charged up outside unit. Refrigerant line temperature was 54 degrees when he left, but supply only got down to 66 degrees. Return air is about 74. Tech said the supply would get cooler as the system ran and the new coolant circulated. Not much of a change now.

Inside coil is clean and shiny as far as I can tell and was replaced two summers ago.
Filter is clean and changed monthy.
Refrigerant line going into inside coil is 55 degrees.
Ducts are as sealed as I can see having also added some foil tape to seams.
Units (apart from inside coil) are about 10 years old.

Any ideas as to why the supply won't get any colder?

I have a smaller A/C unit that run the 1st and 2nd floor and it puts out supply at 59 degrees and feels great.

Thanks for the help.

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Old 06-27-2011, 10:09 PM   #2
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Cold Refrigerant Line...Warm Supply


You need to check the temp just after the Evap Coil. The temp between this point and the supply should be very small.

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Old 06-28-2011, 07:09 AM   #3
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Cold Refrigerant Line...Warm Supply


Could be overcharged now or still undercharged. Outdoor coil clean? No way to know exactly what the problem is from here with such limited info. I'd suggest calling the guy back out since it's still not working right.
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Old 06-28-2011, 08:26 AM   #4
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Cold Refrigerant Line...Warm Supply


I stuck a digital thermometer above the coil and the temperature was averaging 65 to 66 degrees.

Yes, outside coil and unit is clean. Will probably just end up calling the tech back to troubleshoot some more. Ugh.
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Old 06-30-2011, 09:05 AM   #5
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Cold Refrigerant Line...Warm Supply


A/C tech thought the piston near the inside coil was stuck with possible water in line and was going to test by emptying refrigerant into outdoor system and pulling a new vacuum. When trying to pull the vacuum, he said it couldn't happen because the compressor seals were shot and is now recommending a new A/C system. Is this legit? The company is reputable with good ratings and their techs don't work on commission. I'll get a second opinion but wanted to pass this along to the board. Thanks!
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Old 06-30-2011, 11:01 AM   #6
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Cold Refrigerant Line...Warm Supply


How old is the compressor ?? 66 in, 74 out, give you 8 degree split. not good. don't know why he can not pull a vacuum unless there is a leak. your smaller unit has 59 in, 74 out(?), 15 degree split is just borderline, but OK for a 10+ year old unit.
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Old 06-30-2011, 01:02 PM   #7
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Cold Refrigerant Line...Warm Supply


Yes, refrigerant level was already down some from last Thursday when it was pumped up; so tech also suspects another system leak.

Both units are about 10 years old. Smaller unit supply is 59 degrees and return of 74. No complaints on that one.
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Old 06-30-2011, 06:29 PM   #8
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Cold Refrigerant Line...Warm Supply


Time for a second opinion . Call the service manager and ask that a senior tech be sent out to find the leak, check the charge and check the compressor. Not a good idea to put a bunch of money into that system IMO but you have to know exactly what's wrong before a decision can be made.

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