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  1. #1
    Join Date
    Feb 2012
    Posts
    21

    404A Freezer Issue

    I have a 404A split system walkin with line setts approx 30 ft, I have a box temp of 12 deg F and dropping. System Pressures are 25 PSIG Low side and 175 PSIG High side. 12 inches from Compressor I get a 45 deg F. When adding 404A the low side pressures temp and PSIG drop raising my superheat. Currently my superheat is approx 55 deg F. After de-Iceing evap coil and TXV and Selnoid valve I noticed TXV is frosting up imediately. I changed the selnoid coil and no change.
    My thoughts are recovery refridgerant and change both TXV and selniod valve. Approximately 6 months ago the coil went bad on the valve... Any suggestions or thoughts???

  2. #2
    Join Date
    Dec 2009
    Posts
    147
    You have a low refrigerant charge.

  3. #3
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,741
    Quote Originally Posted by KickedGinger View Post
    You have a low refrigerant charge.
    looks that way.
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    How-to-apply-for-Professional

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

  4. #4
    Join Date
    May 2004
    Posts
    11,967

  5. #5
    Join Date
    Feb 2006
    Location
    USA
    Posts
    4,381
    Your SOLENOID shouldn't be icing up. I am reading this right that you de-iced it right?

    Sent from my SCH-I800 using Tapatalk

  6. #6
    Join Date
    Aug 2012
    Location
    Georgia
    Posts
    27
    Do you happen to have a sight glass installed? I'm surprised your box temp is 12 with that superheat.

  7. #7
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,400

  8. #8
    Join Date
    Feb 2008
    Location
    California
    Posts
    2,064
    low on gas, restricted drier, restricted TEV.

    Do you have a liquid sight glass?

    Need to dig deeper.

    55* superheat and a 12* box is fishy

  9. #9
    Join Date
    Aug 2012
    Location
    Palmyra, Missouri, United States
    Posts
    224
    Is the coil still froze up. Make sure both sides of the coil are free of ice.

  10. #10
    Join Date
    Feb 2012
    Posts
    21
    Quote Originally Posted by drife678 View Post
    Is the coil still froze up. Make sure both sides of the coil are free of ice.
    Sight glass yes, no bubbles....
    Selnoid was frozen up because the whole side with TXV, seloid, and fan delay all were under a solid block of ice.

  11. #11
    Join Date
    Feb 2012
    Posts
    21
    Both sides of evap coil were cleared.

  12. #12
    Join Date
    Mar 2007
    Location
    NW AR
    Posts
    2,478
    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.

  13. #13
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,741
    Whats the ambient temp at the condenser.
    Last edited by beenthere; 08-13-2012 at 04:33 PM. Reason: spelling
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