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  1. #27
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,596
    Airflow? Unit have a belt drive blower? Have you tried heating up the expansion valve bulb with your hand to see if it will react at all?

  2. #28
    Join Date
    May 2011
    Location
    tallahassee,fl
    Posts
    380
    Need sub cooling measurement now to further diagnose.

  3. #29
    Join Date
    Aug 2012
    Location
    North Dakota
    Posts
    518
    yes in my world w/ txv you should be charging to subcooling

  4. #30
    Join Date
    Apr 2012
    Location
    winnipeg
    Posts
    1,330
    its still not right ...,..getting better though
    it was working.... played with it.... now its broke.... whats the going hourly rate for HVAC repair

  5. #31
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    4,479
    bad txv or clogged drier

  6. #32
    Join Date
    Sep 2012
    Location
    Melbourne, Australia
    Posts
    5
    Standing pressure of R22 of 200 PSI sounds a little high to lil old me. I'd expect more like 90-100 equalised. Would try rto reclaim some juice and see what happens to prove over charged thoery, before jumping to conclusion of a dead TXV. Could be non condensables too if someone doesn't consider a vacc pump worthy If it is over charged after taking some juice out, reclaim the lot just incase of non condensables, throw in a new liq drier, vacc the lot out way down low and crage her again. This time make sure the ambient is high enough or block some condenser not to over charge her. Head pressure is relative to suction!

    Assuming the obvious,the fan is running, and there is no other valve between high side and low side which might be DOA, closed blocked. TXV could then be the only blockage. Those ball valves are open right?

  7. #33
    Join Date
    Apr 2012
    Location
    winnipeg
    Posts
    1,330
    oh boy .... i am going to bed
    it was working.... played with it.... now its broke.... whats the going hourly rate for HVAC repair

  8. #34
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    4,479
    i know......i know.....

    90-100psi standing is ~ 60* outside temp.

    the OP never told us what the outdoor ambient is.

    also, whats this head pressure is relative to suction stuff?

  9. #35
    Join Date
    Jun 2004
    Posts
    896
    What's the subcooling?

  10. #36
    Change the TXV

  11. #37
    Join Date
    Oct 2007
    Location
    Austin Texas
    Posts
    1,828
    Missing way too much information to try to help. Besides this is the resi section. Who has a ten ton unit at their house?
    Nemo me impune lacessit.

    How much blood do I have to bathe in to get clean?

    Don't look down on anyone unless you're helping them up.

  12. #38
    Join Date
    May 2012
    Posts
    34
    Now it seems to be running right but can't lower low side line temp, its about 76degrees coming into the compressor.
    I don't see any insulation on your compressor suction line in that photo.

  13. #39
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,051
    Quote Originally Posted by John Culpepper View Post
    Missing way too much information to try to help. Besides this is the resi section. Who has a ten ton unit at their house?
    I do. Jk

    but its a two stage so I have that "extra " little bit you know.

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