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  1. #14
    Join Date
    May 2004
    Posts
    11,855

  2. #15
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    66,750
    Quote Originally Posted by Dad View Post
    Rough day at the spelling bee Jim?

    The last hot attic I was in today, killed me.
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    How many times must one fix something before it is fixed?

  3. #16
    Join Date
    Feb 2012
    Posts
    21
    Quote Originally Posted by ar_hvac_man View Post
    Make sure the coil is completely clear of ice. Many times once you get the back clear you will still have ice on the front. Measure your SH at the evaporator.

    Does the unit have an accumulator? There will be a very large diff in SH if you measure the line going into the accumulator and the line coming out and going into the compressor.
    Yes It has an accumulator

  4. #17
    Join Date
    Feb 2012
    Posts
    21
    When I add refrigerant low side pressures drop and it raises my superheat. Sight glass has no bubbles

  5. #18
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    24,933
    Quote Originally Posted by Lennyb View Post
    When I add refrigerant low side pressures drop and it raises my superheat. Sight glass has no bubbles
    You don't adjust superheat on a refrigeration system by adding or removing charge.

    You adjust the superheat by adjusting (or repairing the TEV).

    Now that we have a clear sightglass, let's dismiss the idea of low charge for now.

    Since the TEV regulates the amount of refrigerant that goes into the evaporator, thus controlling superheat, we might want to take a look at that before we add any more gas.

  6. #19
    Join Date
    Feb 2012
    Posts
    21
    Condensor ambient temp was approx 90 deg F

  7. #20
    Join Date
    Feb 2012
    Posts
    21
    I did try and turn off the TXV's cap, but I didn't have room to get any wrenches on it. It has been replaced sometime before and adjusting TXV obviously wasn't on the installers adgenda. It is an externally equalized TXV with a removeable power head. I wanted to open up TXV some but like I said impossible to get a wrench on it. I will try later when Im back to the Unit with a socket.
    Last edited by Lennyb; 08-13-2012 at 04:54 PM. Reason: Adding info

  8. #21
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    24,933
    Quote Originally Posted by Lennyb View Post
    I did try and turn off the TXV's cap, but I didn't have room to get any wrenches on it. It has been replaced sometime before and adjusting TXV obviously wasn't on the installers adgenda.
    There's always a way.

    It isn't always easy, but there IS a way.

    Oh, by "cap" you do mean the adjustment cap and not the power element, right? You take that off without pumping the system down first and

  9. #22
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    66,750
    R404A at 175 PSIG is a sat of 80F.

    Where did you take the LL pressure? Might have a restricted LLFD.
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  10. #23
    Join Date
    May 2004
    Posts
    11,855
    Let's go about this a different and much better way, shall we?

    OP...

    Model of condenser/compressor and age of this unit
    Amp draws of the compressor while under a load
    Model of evap and age of this unit
    TXV information and cartridge size along with location of bulb and how it is mounted
    Orifice size in distributor if there is one
    Head pressure
    Suction pressure
    Suction line temp at the evap coil outlet
    Any pertinent work preformed on this box and what was it doing before that required such work.


    Stop guessing guys. Let's get the facts first, yes?

  11. #24
    Join Date
    Sep 2005
    Location
    florida
    Posts
    5,495
    Quote Originally Posted by Dad View Post
    Let's go about this a different and much better way, shall we?

    OP...

    Model of condenser/compressor and age of this unit
    Amp draws of the compressor while under a load
    Model of evap and age of this unit
    TXV information and cartridge size along with location of bulb and how it is mounted
    Orifice size in distributor if there is one
    Head pressure
    Suction pressure
    Suction line temp at the evap coil outlet
    Any pertinent work preformed on this box and what was it doing before that required such work.


    Stop guessing guys. Let's get the facts first, yes?


    X2 we need info first.
    I love the smell of phosgene first thing in the morning:

    To apply for professional membership click here


    Educational forums are open.

    If you would like to submit a link or an article or other related info to the EF. click here

  12. #25
    Join Date
    Feb 2012
    Posts
    21
    No not the power head lol, yes the adjustment cap so I can get a refrigerant wrench on it.
    Last edited by Lennyb; 08-13-2012 at 05:26 PM. Reason: Adding pic

  13. #26
    Join Date
    Feb 2012
    Posts
    21
    175 PSIG was off the liquid line receiver. What would good low and high side PSIG be for a 404a freezer application ?

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