4 way valve testing question
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  1. #1
    Join Date
    Jun 2009
    Location
    Mount Juliet, Tn
    Posts
    19

    4 way valve testing question

    Hi everyone,
    Getting some mixed messages on 4 way valve testing. What is generally acceptable on the temp pass through? I was always told 3 degrees?

    Today I had one that was losing 20 degress on the high side pass thru, 199 to 179. But the low side was right on the money. No temp increase. So where did this 20 degress of heat go?

    On this same unit the TXV that is on the indoor coil is blocked, it shoud allow free flow in heat mode but it is major blocked. Losing 40 degress across the txv (80-40). Im talking about the TXV that meters in AC mode but should not in heat mode. Maybe this has something to do with the 4 way problem because it has my pressures down to nothing. Im going to change the TXV and then double check the 4 way. Just seems strange.

    Thanks for any advice

  2. #2
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,630
    Can't check a RV if a TXV is restricting.
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    How many times must one fix something before it is fixed?

  3. #3
    Join Date
    Mar 2007
    Location
    Myrtle Beach, SC
    Posts
    2,919
    I was always told 5 degrees.
    Remember, Air Conditioning begins with AIR.

  4. #4
    Join Date
    Jun 2003
    Location
    Virginia
    Posts
    376
    The temp difference you get depends on whether you're in heating or A/C and what loading you have. If in A/C mode at near full load, I would think you should see less than 1F difference on the suction side and maybe up to 3 degrees on the discharge side if that....

  5. #5
    Join Date
    Jan 2010
    Location
    North Huntingdon,Pa
    Posts
    356

    ?

    Quote Originally Posted by Kevin O'Neill View Post
    I was always told 5 degrees.
    ditto - threshhold of most mfg ratings
    PA#9377
    Your Satisfaction...Our Goal.

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