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  1. #1
    Join Date
    Jun 2004
    Posts
    11
    I just bought a 2 story 2400 sq.ft. house and I find that, even if noone is going in and out during the day, the A/C can't maintain 74F during the day. On a sunny day, the temp will creep as high as 80, starting from 74 in the morning, before the evening comes and it starts to cool down again. The A/C is a single York and I don't know the size or age of the unit. Where do I look for this info? I do know that the filter for the return vent is a 20x30, and I think it is too small, since a new filter is bowed up from airflow as soon as it is put in place.

    I have a 609 cert and have been doing automotive A/C for over 10 years, but I don't know much about HVAC. I am assuming the refrigerant is R-22, since my R12/22 manifold gauge connectors fit. The pressures last night, with it being 76 in the house and 82 outside, were 60 and 165. I was wondering if this indicates a problem such as low refrigerant.

    We have a home warranty, so I can will call them if I have a problem, but I'd like to know a little about the problem before calling them in.

    Thanks,

  2. #2
    Join Date
    Feb 2002
    Location
    Houston Tx
    Posts
    344
    low on r-22.

  3. #3
    Join Date
    Apr 2004
    Location
    Meridian, MS
    Posts
    268
    Most likely low charge,if so you have a leak and the home warranty co. will just want to charge the unit up,this may last through the warranty. then next year it will need freon again.Ask the service Co. to find and repair the leak.

  4. #4
    do not forget superheat and subcooling measurements, pressures pressures alone do not tell the whole story

  5. #5
    Join Date
    Dec 2003
    Location
    Kenilworth New Jersey
    Posts
    230
    Short on juice!!!!!!!! At 82* outdoor temp your head should be around 220# - 230 #

  6. #6
    Join Date
    Jun 2003
    Location
    Florida
    Posts
    9,548
    Originally posted by h2045
    Short on juice!!!!!!!! At 82* outdoor temp your head should be around 220# - 230 #

    That's not always true. I just checked one that was 205psig at 92 ambient. You need the subcooling/superheat measurements to know what's going on in the system. That 160 head pressure sounds low,but the suction isn't far off. Don't just ASSUME it's short of freon.
    If everything was always done "by the book"....the book would never change.

  7. #7
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,760
    I would have the duct system checked. It also sounds like you may have an air flow problem.
    After that is checked, and fixed if not right, the refrigerant part of the system can then be checked acurately.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  8. #8
    Join Date
    Jun 2004
    Posts
    11
    Thanks all!

    If it's flow I'll have to hire someone because the warranty specifically excludes installation issues. I've got a bad feeling about that though. That return is only 33% bigger than the one in my old 2 bedroom apartment and it seems like it's pulling way to much dp across a new filter. Guess I'll get the warranty people out and have them tell me exactly what is wrong. If I have to hire someone, I have to. The electric bill will eat me alive otherwise...

    Measured the pressures again today at 87F outside 77F inside and they were 185/65.

  9. #9
    Join Date
    Apr 2004
    Location
    Meridian, MS
    Posts
    268
    Originally posted by hittman
    Most likely low charge,if so you have a leak and the home warranty co. will just want to charge the unit up,this may last through the warranty. then next year it will need freon again.Ask the service Co. to find and repair the leak.

    vaderss
    My point is, if it is low on freon have them fix the problem or you will be paying out of your pocket when the warranty is gone next year.

  10. #10
    Join Date
    Nov 2003
    Location
    katy texas
    Posts
    157

    DUCT-OLIGIST

    find one of only 5 contractors in the free world that can read total external static pressure and CFM . Tyou will be amazed at what you find.
    yeaterday i measured a system that had been condemmed as too small by 3 other comapanys . this was a 3 ton system capable of 1200 CFM with perfect static pressure. it was actually only producing 855 CFM. We made 1500 bucks worth of duct modifications and guess what ? the undersized system works great .
    good luck on finding a duct-oligists we are a dying breed .

  11. #11
    Join Date
    Jun 2004
    Posts
    11
    Hittman, I understand what you are saying. I'll make sure they fix the leak if it's low on refrigerant. I know all about people charging for the summer and not worrying about where the leak is.

    Robinair, any reccomendations as where to look? I'm in Houston. Seems like I'd have a decent shot at finding a good one.

  12. #12
    Join Date
    May 2002
    Location
    Colorado
    Posts
    697
    Try Central City Air.

  13. #13
    Join Date
    Nov 2003
    Location
    katy texas
    Posts
    157

    air balance

    wayne call me mobile at 713 418 0181 24/7 we are in the north west area of houston. thanks robin

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