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  1. #1
    Join Date
    Jul 2004
    Location
    NJ
    Posts
    1,801
    I helped a friend of mine this weekend to put a walk-in cooler together.From supplyhouse they gave him a crankcase heater among other stuff.Its a pumpdown sytem.I wired the t-stat to control the LLSV.And LPC to pumpdown.I try to convince him that we don`t need to install the CCH.What say you?

  2. #2
    use it
    Don't interrupt me while i'm talking to myself

  3. #3
    Join Date
    Dec 2003
    Location
    Nevada
    Posts
    1,815
    You need it
    Quote
    “Engineers like to solve problems. If there are no problems handily available, they will create their own." Scott Adams

    "We can't solve problems by using the same kind of thinking we used when we created them."
    Albert Einstein

  4. #4
    Join Date
    Jul 2004
    Location
    NJ
    Posts
    1,801
    Originally posted by hvacbear
    You need it
    If CCH is needed to keep the R22 out of oil during of cycle,the LPC is gonna ensure it anyway.So tell me why you think I need it?

  5. #5
    Join Date
    Nov 2003
    Posts
    501
    In low temps, it also keeps the oil warm and "oily." Sorry, I forgot the term.

    It's the same thing as a block heater for a truck.

  6. #6
    Join Date
    Jul 2004
    Location
    NJ
    Posts
    1,801
    Originally posted by dorrmann
    In low temps, it also keeps the oil warm and "oily." Sorry, I forgot the term.

    It's the same thing as a block heater for a truck.
    viscosity?

  7. #7
    Join Date
    Dec 2003
    Location
    Nevada
    Posts
    1,815
    Yes viscosity, some refrigerant will become entrained in the oil and the heat will drive it out. Also solenoid valve fail so a crankcase heater is a little insurance.
    Quote
    “Engineers like to solve problems. If there are no problems handily available, they will create their own." Scott Adams

    "We can't solve problems by using the same kind of thinking we used when we created them."
    Albert Einstein

  8. #8
    Join Date
    Oct 2002
    Posts
    970
    In a perfect world , compressor valves don't leak, solenoids don't leak, customers don't shut off breakers by mistake.

    Sure, a continuous pumpdown system controls liquid migration on the off-cycle, but it doesn't mean chuck the cch. It's cheap insurance as bear mentioned

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