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  1. #1
    Join Date
    Feb 2005
    Posts
    15
    when checking ohms on a compressor the highest reading is between run and start, middle reading start and common, and lowest reading between common and run. is this correct?
    how does it read on the schematic

    R S C R S C

    C S R


    C S R

    R S C R S C

    what is the purpose of the run capcitor and the start capacitor?

  2. #2
    It's been many years since I have used this, but if I am wrong I'm sure there will be some people here happy to correct me.

    R to C = lowest reading
    S to R = Highest reading
    S to C = middle reading

    In general the two lowa should add up to the high (approx.)

    [Edited by fat eddy on 02-26-2005 at 08:39 AM]

  3. #3
    Join Date
    Feb 2005
    Posts
    15

    ohming compressor

    Originally posted by lmtd
    Originally posted by fat eddy
    It's been many years since I have used this, but if I am wrong I'm sure there will be some people here happy to correct me.

    R to C = lowest reading
    S to C = Highest reading
    S to R = middle reading

    In general the two lowa should add up to the high (approx.)
    Nope, you messed up eddy:

    R to C = lowest reading
    S to C = middle reading
    S to R = Highest reading
    thank you for the information, very usefull

  4. #4
    Join Date
    Dec 2004
    Location
    louisville
    Posts
    46
    I ohm out compressor windings ferquently and have never had any problems, but I'm sure I will now!

  5. #5
    LMTD,

    You said I was wrong then posted the same readings that I did go figure

  6. #6
    Join Date
    Aug 2003
    Location
    Fort Worth, TX
    Posts
    11,292
    Originally posted by fat eddy
    LMTD,

    You said I was wrong then posted the same readings that I did go figure
    Eddy,

    Yours:

    R to C = lowest reading
    S to C = Highest reading
    S to R = middle reading


    His:

    R to C = lowest reading
    S to C = middle reading
    S to R = Highest reading


    Um... I see a difference.

    • Electricity makes refrigeration happen.
    • Refrigeration makes the HVAC psychrometric process happen.
    • HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.


    A building is NOT beautiful unless it is also comfortable.

  7. #7
    Join Date
    May 2004
    Posts
    39
    C and R - Lowest
    C and S - Low
    S and R - Highest and MUST be equal to the sum of the resistenace of C & R plus C & S

  8. #8
    Sorry LMTD,

    You were right my original post did state the wrong information, thank you for catching that typo. I have since edited the typo to reflect my original intention.

    Thank You,

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