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  1. #1
    Join Date
    Jun 2001
    Location
    Tracy, California
    Posts
    15

    Unhappy How do I set a Traulsen CPR valve ?

    Hi-

    It's been a while since my last post, but I goofed ... quick background ...
    I've been self-maintaining refers, etc at my 2 bar/restaurants in No. Calif
    for the last 10 years or so.

    I was working on an old Traulsen Freezer (R-12 Model ALT 2-32NUT).
    that was having minor troubles maintaining temp on the particularly hot
    days we've had recently. I thought I was doing good by cleaning
    cond coils & replacing one of the 2 cond fans that I discovered had
    stopped working. Unfortunately & surprisingly nothing improved.

    I threw my gauges on and saw high side at 150 & suction at 0.
    Not realizing there was a crankcase pressure regulating valve
    just upstream of the suction side (covered with insulation) I thought
    it just needed a little more R12.

    Long story short, along with other things, I went and messed with
    the regulating valve's adjusting screw (there's no access port upstream
    of the valve on the evap side). That didn't quite work out.

    Come tomorrow I'm going to suck the system and charge by weight,
    but after I do that how do I get the CPR valve back to where it should be ?
    Just playing around with it in its current state, it seems quite sensitive.

    Thanks,
    -brad a.

    P.S. I already thought about "try not touching the blanking thing
    in the first place !"

  2. #2
    Join Date
    Aug 2000
    Location
    USA
    Posts
    4,993
    Comp amperage.

  3. #3
    Join Date
    Jun 2001
    Location
    San Diego, CA
    Posts
    1,149
    back it off to start with, then:
    put it in defrost.
    get your tools ready and your amp clamp on while its defrosting.
    soon as it kicks out of defrost - crank down on the CPR until your amp clamp reads the LRA as posted on the motor. Be fast.

  4. #4
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    10,426
    Quote Originally Posted by gbfromsd View Post
    back it off to start with, then:
    put it in defrost.
    get your tools ready and your amp clamp on while its defrosting.
    soon as it kicks out of defrost - crank down on the CPR until your amp clamp reads the LRA as posted on the motor. Be fast.
    I'm sure you meant to say the compressor RLA, not LRA.

  5. #5
    Join Date
    Nov 2005
    Location
    Haymarket VA
    Posts
    642
    I'm sure you meant to say the compressor RLA, not LRA.
    one more vote

  6. #6
    Join Date
    Nov 2006
    Location
    long island city
    Posts
    111
    So what was the verdict? Did you replace the CPR? I have the same problem on mine. Suction -10 head 120psi. R502 though with a semi-hemi. I cannot for the life of me get a tool that can turn that beast. Very tight against the wall. Also someone left the discharge service valve open with the hose port closed. My guess the refrigerant is low as well. What refrigerant did you use? 408a/404a?

    jp
    like it love it live it

  7. #7
    Join Date
    Feb 2008
    Location
    California
    Posts
    2,066
    Do you remember any service calls you ran 5 years ago?

  8. #8
    Join Date
    Nov 2006
    Location
    long island city
    Posts
    111
    only the good ones. lol did not check the date.
    like it love it live it

  9. #9
    Join Date
    Dec 2007
    Location
    East Coast
    Posts
    19
    remember...full defrost!!!

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