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  1. #1

    Fluctuating Gage Readings

    I've been in the AC business for a short time and have solved most problems I've come across. This one is bugging me, though.

    3.5 ton Rheem Corsaire R-22 (yeah, I know, cheap), condensing unit < 2 years old with a Ruud air handler - fixed orifice. The system worked fine until about a month ago when the temp in the house would no longer go below 76-77'F. The gage readings fluctuate between 230 and 300 high side and 58-67 low side. The readings fluctuate at a regular interval, i.e. high side goes low, then low side goes low, high side goes back up, then low side goes up. This repeats approx. 2-3 per minute. I checked the orifice - no clog. Temp difference across filter dryer is 0'F.

    Any clues?

  2. #2
    Join Date
    Mar 2003
    Posts
    1,234
    What are the sh and sc readings? Is it a txv or fixed metering device?

  3. #3
    SH is about 7-9'F. SC seemed to be a bit high at 35'F. However, these numbers fluctuate with the gage readings. Also, air handler is a fixed orifice metering device.........

  4. #4
    Join Date
    Feb 2008
    Location
    Dallas & Longview, TX
    Posts
    629
    get your post count up and apply for pro status. This forum isn't the place for this but there is a wealth of knowledge to help you on the pro side. You need 15 posts to apply.

    What is the indoor WB and the OD ambient?

  5. #5
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,104
    How old is the Ruud air handler. Is this a 13SEER condenser on a 10 SEER air handler?
    How do you know it worked fine until a month ago? Is it your house.

    Besides checking the piston, and LLFD, what else did you check.

    Who worked on it last month before you?
    Contractor locator map

    How-to-apply-for-Professional

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

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