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  1. #1

    Tecumseh AEA4440AXA HI TORQUE COMPRESSOR

    OK so most of my 30 year experience with HVAC has been in large commercial AC units so this little Tecumseh AEA4440AXA R-12 under counter hi temp refer box has got me stumped. Unit pulls down, satisfies & shuts down fine. Off cycle duration is about 12 - 20 minutes. When stat calls for cooling compressor won’t start (cuts out on klixon protection) until the HI - LO press differential is less than 22 psi. Compressor is new & all windings ohm out good, changed overload, start relay & capacitor with no change. By the time compressor is able to start the box temp is too warm. My question is this: With these small high torque compressors, what is the typical HI - LO pressure differential compressors can overcome @ start? Thanks Guys!!

    Jim

  2. #2
    Join Date
    Feb 2007
    Location
    Ohio
    Posts
    205
    I would suggest calling tecumseh for the exact pressure but to me that sounds typical at 20 -30 psig. I'm thinking partially restricted cap tube due your pressure should have equalized within the 12-20 minutes off cycle. I can't say that for sure but seems to me.

    Joe S.

  3. #3
    Join Date
    Jun 2003
    Location
    Tampa Bay, FL.
    Posts
    119
    12 minutes is plenty of time for that unit to equalize. I would suspect a restriction also. What are your pressures?

  4. #4
    Join Date
    Jun 2003
    Location
    Chicago, IL
    Posts
    4,325
    The high torque models can easily start against a 200 psi differential. They don't need any equalizing time.


    What is the supply voltage while it is attempting to start?

  5. #5
    Join Date
    Aug 2002
    Location
    Southold.calm
    Posts
    5,423
    Heres the tech sheet for that pump.

    http://www.tecumseh.com/en/united-st...?pdf=datasheet

    Whats the SH when running?

  6. #6
    Join Date
    Sep 2007
    Location
    British Columbia
    Posts
    13
    This unit isn't on an extension cord or anything like that is it?? that will create a voltage drop...

  7. #7
    Join Date
    Sep 2001
    Location
    prov.r.i.
    Posts
    1,437
    Make sure it's on it's own circuit,worked for coca cola for years,had them baby's all plugged in along with Pepsi coolers and what not,that's a 1/2 hp compressor any kind of voltage drop will cause that.
    if at first you dont succeed,then skydiving is not for you

  8. #8
    Join Date
    Jun 2003
    Location
    Tampa Bay, FL.
    Posts
    119
    We need more details. Is this a single door or multiple door cooler? Model? Manufacturer? Etc.

  9. #9
    Quote Originally Posted by craig1 View Post
    The high torque models can easily start against a 200 psi differential. They don't need any equalizing time.


    What is the supply voltage while it is attempting to start?
    Thank you for sharing. I assumed the hi torques didnt need much equalizing but didnt know so now I will check the integrity of my voltage. I know I have 116 VAC static (no load) but will check on load integrity next.

    Thanks again!
    Jim.

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