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  1. #1
    Join Date
    Jan 2008
    Location
    Fuquay-Varina, NC
    Posts
    22

    Crankcase Heater

    What is an approxiamate temp. a CCH gets up to?

  2. #2
    Join Date
    Apr 2008
    Location
    On the roof
    Posts
    136
    If you can touch it, its not hot enough
    If you didn't do it right the first time it probably makes sense that your here asking the right way to do it now

  3. #3
    Join Date
    Oct 2007
    Location
    Austin Texas
    Posts
    1,828
    If you can hold your hand on it , it probably needs replacing.
    Nemo me impune lacessit.

    How much blood do I have to bathe in to get clean?

    Don't look down on anyone unless you're helping them up.

  4. #4
    Join Date
    Jan 2008
    Location
    Fuquay-Varina, NC
    Posts
    22
    Ok, just wondering...I am at student at a technical school, and my unit at home had a bad crankcase heater...Every Trane I see has a bad one...I guess you only really need it in the winter, right...

  5. #5
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,770
    Winter, and lower temp cooling days, were the night temp may have been low enough for liquid refrigerant to mix with the oil.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  6. #6
    Join Date
    Apr 2007
    Posts
    6,285
    Bristol has some specific instructions and Copeland provides a part# for CCH for compressor model numbers. I thought Trane used the trickle CCH.


    NM i see the Trane one now or at least one version.
    Last edited by BigJon3475; 04-30-2008 at 10:50 AM.

  7. #7
    Join Date
    Jan 2007
    Location
    Charm City--the city that bleeds
    Posts
    2,790
    hot enough to give you a tattoo

    but even if it's not hotter than your hand, that's a Class One indicator ...

    I wonder if any engineers would shed some light on the specifics. Some low ambient kits call for a second CCH.
    It's great to be alive and pumping oxygen!

  8. #8
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,770
    CCH aren't rated by a *F, or C. They are rated by wattage. The wattage required to keep the oil at X*. The temperature they reach in *F/C, is determined more by their physical size, and what surrounds them to absorb the heat.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  9. #9
    Join Date
    Apr 2007
    Posts
    6,285
    Bristol had (kinda old now) a .pdf that basically says 20ºF warmer than the coldest section of the system.

    It's suppose to be to inform the public and last revision was 2/27/98

    "1.0 Purpose
    To inform the customer of the following:
    ¨ Importance of a crankcase heater and the need for system evaluation to assure necessity
    and proper sizing of the heater for each application.
    ¨ Compressor charge limitation.
    ¨ Systems exceeding the compressor charge limitation.
    ¨ High and low ambient liquid refrigerant migration and methods to correct.
    ¨ Important factors and test procedures to determine need and/or sizing of a crankcase
    heater."

    "The crankcase heater size (in watts) depends on the following factors:
    ¨ Differential temperature (between compressor sump and system) which is necessary to
    move/keep liquid refrigerant out of the compressor.
    ¨ Total system charge and potential overcharge.
    ¨ Time the heater is energized before compressor starts up.
    ¨ Maximum system ambient (indoor section and outdoor section).
    ¨ Sun load on condenser (louvered, covered or exposed coil).
    ¨ Type of system: split, package, air conditioning, heat pump, chiller, close coupled, long
    line sets, etc.
    ¨ CFM of air across compressor.
    ¨ Type/location of heater – in well or wrap around."



    Pretty interesting it talks about reverse migration in high ambient conditions.That's was new to me.....didn't know it could help in high ambient also.

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