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  1. #14
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    Sep 2014
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    Portland, Oregon, United States
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    Thread Starter
    Thanks for the info guys!!

    How about the ones that have a temp sensor, seen several on the Trane units that close at like 40 degrees or something.. any benefit to that instead of on 24/7?

  2. #15
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    May 2014
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    I think it's closer to 60*F. Seems to work out good. Compressors have a long life with just the minimal service.


    Quote Originally Posted by heatingelement View Post
    Thanks for the info guys!!

    How about the ones that have a temp sensor, seen several on the Trane units that close at like 40 degrees or something.. any benefit to that instead of on 24/7?
    If you were a real tech, you'd solder a relay on that board and call it good to go.

    I do a triple evac with nitro to remove non condensables.

    I use 56% silver on everything except steel.

    Did you really need the " If you were a real tech " ??

  3. #16
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    Mar 2015
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    Medford, N.Y.
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    Quote Originally Posted by heatingelement View Post
    Thanks for the info guys!!

    How about the ones that have a temp sensor, seen several on the Trane units that close at like 40 degrees or something.. any benefit to that instead of on 24/7?
    Thats a 60* CCH on/off temp control or a CompContactor lock out sw?

  4. #17
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    Aug 2002
    Location
    Southold, NY
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    Quote Originally Posted by heatingelement View Post
    Thanks for the info guys!!

    How about the ones that have a temp sensor, seen several on the Trane units that close at like 40 degrees or something.. any benefit to that instead of on 24/7?
    RayChem is self regulating. No need for a control to fail.

  5. #18
    Join Date
    Jun 2006
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    At Copeland school 25 years (Gene maybe?) ago we were told crankcase had no effect below 50F.

  6. #19
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    May 2014
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    Bay Area California
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    I think you got that backwards. Because if you are correct, then CCH's would be most important when it was 120*F outside. Just sayin'.


    Quote Originally Posted by stat View Post
    At Copeland school 25 years (Gene maybe?) ago we were told crankcase had no effect below 50F.
    If you were a real tech, you'd solder a relay on that board and call it good to go.

    I do a triple evac with nitro to remove non condensables.

    I use 56% silver on everything except steel.

    Did you really need the " If you were a real tech " ??

  7. #20
    Join Date
    Nov 2011
    Location
    East Side
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    I could see less effective below 50*. The actual small amount of heat they generate (especially back then) prolly couldn’t combat extreme cold.

    Kinda like cooling tower heaters. When it’s 5* outside, 50 amps isn’t gonna keep 500 gallons above freezing.

  8. #21
    Join Date
    May 2014
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    Bay Area California
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    Poorly insulated ?
    If you were a real tech, you'd solder a relay on that board and call it good to go.

    I do a triple evac with nitro to remove non condensables.

    I use 56% silver on everything except steel.

    Did you really need the " If you were a real tech " ??

  9. #22
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    Nov 2011
    Location
    East Side
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    Well, If you have a 3 watt heater, with the mass of a compressor, and 5* ambient.....what’s going to win?

  10. #23
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    Dec 2014
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    New Mexico
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    The little bit of heat that is put in even at 5 degrees OSA will still cause the refrigerant to migrate else where in the system. The refrigerant wants to go where it’s colder.


    Sent from my iPhone using Tapatalk

  11. #24
    Join Date
    Oct 2002
    Location
    Plano, TX
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    Quote Originally Posted by heatingelement View Post
    Thanks for the info guys!!

    How about the ones that have a temp sensor, seen several on the Trane units that close at like 40 degrees or something.. any benefit to that instead of on 24/7?
    Energy savings. 480 volt unit have a transformer with stat to power CCH. Way to many parts. Trane use to trickle current through windings to generate heat

  12. #25
    Join Date
    Oct 2002
    Location
    Plano, TX
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    Allied RTU do not come with CCH. Ordered a factory low ambient kit for RTU. Still not included. So, I guess they don't think it the risk is there for damaged compressors.

  13. #26
    Join Date
    Mar 2015
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    Medford, N.Y.
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    Quote Originally Posted by stat View Post
    At Copeland school 25 years (Gene maybe?) ago we were told crankcase had no effect below 50F.
    Gene? Or Glenn Hannagan?

    My Copeland info in a Application Engineering Bulletin states that 0*F ambient is the boarder line for overpowering the heat produced by the properly sizes CCH.

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