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  1. #1
    Join Date
    Feb 2006
    Location
    Phoenix,AZ
    Posts
    2,891

    Walk in Freezer!

    Had a odd one today. 404a Walk in running warm. I arrive and go inside box. Hear the liquid line hissing like it's low on gas. grab line and it's hot. Threw my low side gauge on the evap and suction pressures 80 psi. WTF is my condensor fans out. Well, i find out one of them is, But, other 2 are running and condensors is spotless. Head is close to 400. SG is flashing!! What do you think is wrong with it? This is a coldzone rack system. Other systems on same rack are doing ok even though one fan is out.

  2. #2
    Join Date
    Apr 2010
    Posts
    94
    Can you pump down that system? Make sure you don't have bad valves in that compressor.

  3. #3
    Join Date
    Dec 2010
    Location
    new jersey
    Posts
    366
    If the line is hot it's not condensing, which is probably the hissing that you here, or may have some blow by..

    did you try a sprinkler under the condenser until you can return w/ the motor?

    what was the amb. ? 404-a dosn't do well in hot weather....

    I had the same thing the other day, the condenser was a unicon with 4 other circuits on it.

    lost the fan opposite the header end...working w/ sprinkler over weekend.
    Last edited by sprmktrefertech; 06-06-2012 at 10:08 PM. Reason: spelling

  4. #4
    Join Date
    Feb 2006
    Location
    Phoenix,AZ
    Posts
    2,891
    It's running 400 head. I don't think bad valves are gonna give you 400 head. I actually got the unit running right in a couple minutes. This is just for fun!

  5. #5
    Join Date
    Feb 2006
    Location
    Phoenix,AZ
    Posts
    2,891
    Quote Originally Posted by sprmktrefertech View Post
    If the line is hot it's not condensing, which is probably the hissing that you here.

    did you try a sprinkler under the condenser until you can return w/ the motor?

    what was the amb. ? 404-a dosn't do well in hot weather....

    I had the same thing the other day, the condenser was a unicon with 4 other circuits on it.

    lost the fan opposite the header end...working w/ sprinkler over weekend.
    Outdoor ambient was 93

  6. #6
    Join Date
    Jun 2007
    Location
    Williamsport, PA
    Posts
    165
    does it have a head pressure control vale stuck in bypass.

  7. #7
    Join Date
    Feb 2006
    Location
    Phoenix,AZ
    Posts
    2,891
    Quote Originally Posted by johndief View Post
    does it have a head pressure control vale stuck in bypass.
    Yeah, it did. I cut the tit off the powerhead and high side fell to 280 and glass cleared right up. Gonna install a new one later in the week.

  8. #8
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,692

  9. #9
    Join Date
    Oct 2002
    Location
    Lexington, NC
    Posts
    5,144
    Quote Originally Posted by KB Cool View Post
    Yeah, it did. I cut the tit off the powerhead and high side fell to 280 and glass cleared right up. Gonna install a new one later in the week.
    I haven't dealt much with these. Is this an acceptable way to bypass the valve temporarily? No chance of leaks?
    The main thing is to keep the main thing the main thing!

    If "the grass is greener on the other side", it likely has been fertilized with Bull$hit!

  10. #10
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,692
    Quote Originally Posted by nchvac View Post
    I haven't dealt much with these. Is this an acceptable way to bypass the valve temporarily? No chance of leaks?
    It'll leak sometimes.

  11. #11
    Join Date
    Feb 2006
    Location
    Phoenix,AZ
    Posts
    2,891
    Quote Originally Posted by jpsmith1cm View Post
    It'll leak sometimes.
    Your absolutely right!!! I woke up this morning. Read your post and five minutes later Boss calls and said i got to go back to the walk-in first. Because, it's down again! I get there and the first thing i do is grab the soap bubbles out of my van and head to the roof. Sure thing it's leaking right where i snipped. Closed up the hole with my dykes recharged it and headed off to get the valve. Im changing it tomorrow morning! First thing!!! I can't see how the 404 is making it's way into the powerhead unless there is some kind of seal failure. That maybe caused the valve to stick open in the first place?
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