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  1. #1

    A Walkin Mystery?

    I'll try to make this as short as possible. Customer buys a used Walkin ( I actually call it a reachin because of its size) 4x6 that is in working order. The guy that disassembled it took it to customers work in pieces (refrigeration unit is a drop in roof mount so no lines cut etc.) before he left he leaned the refrigeration unit up against a wall and broke a line. It sat like that for a few weeks. I was called to install it. I replaced the filter/dryer and repair the broken line. Evac was for about 2 hours. The unit was originally r12 so I charged it with hot shot. Put exact amount it called for (@ 80% volume). The evap coil was only getting slightly cool on one side similar to a low refrigerant level. It was a favor and I was real busy so another guy came and evacuated it again and charged it and supposedly got it working right? Apparently now it is cooling properly except when it starts to get hot outside the unit will only cool to about 50 degs. ( outside temp 80+ degs) when it is cooler outside it apparently pulls down to proper temp easily. It is kind of out of my way to look at it or I would have done the work myself.

    Just to pick your brains does anyone have a guess as to what is wrong with it? It's a long trip and I would love to have some ideas before I make the trip to look at it.

    The guy is telling customer that compressor is bad but I think there may be blockage in one of the lines or possibly this unit just doesn't like hot shot. Any thoughts?

    R12 Walk In COOLER running hot shot. Coils are clean, fans are functioning properly. I think the suction line was freezing from compressor to evap coil only and of course only getting slightly cold on the part of evap coil (little less than a 1/4 of coil getting cold)

    Thanks, I appreciate any thoughts!

  2. #2
    Join Date
    Feb 2008
    Location
    California
    Posts
    2,064
    Quote Originally Posted by jwsav View Post
    I think the suction line was freezing from compressor to evap coil only and of course only getting slightly cold on the part of evap coil (little less than a 1/4 of coil getting cold)
    Based off of that...

    It sounds like liquid refrigerant is bypassing your evaporator coil through your TEValve equalizer line

  3. #3
    Join Date
    Sep 2005
    Location
    florida
    Posts
    5,501
    Quote Originally Posted by Phase Loss View Post
    Based off of that...

    It sounds like liquid refrigerant is bypassing your evaporator coil through your TEValve equalizer line

    I agree.
    I love the smell of phosgene first thing in the morning:

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  4. #4
    Join Date
    Aug 2002
    Location
    Southold.calm
    Posts
    5,430
    You did a lot of typing but gave us very little information.

    Read this.

    http://hvac-talk.com/vbb/showthread.php?t=158850

  5. #5
    Join Date
    Oct 2008
    Location
    mid-Tennessee
    Posts
    694

    Talking

    You said he said the guy said the compressor is bad?
    If he tried pumping it down to the receiver and it doesn't, then it is. That'd be what I'd do first.
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  6. #6
    Join Date
    Jul 2009
    Location
    Northern area between Alantic and Pacific
    Posts
    107
    bad txv is my thought.

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