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  1. #1
    Join Date
    Oct 2019
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    New AC 5 ton compressor over heating

    Hi Every one , I installed new compressor 5 ton R22 , starts good , runs about 45 minutes and trips on over heating. Return 55 psi and high at 200 , I dont know what is wrong with the unit it is taking 17 to 18 amps . Please advice me how to fix the problem ?

  2. #2
    Join Date
    Jun 2013
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    52
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    55 psi on the return is 30 degees in the evaporator, that will freeze evap and is too low for enough refrigerant returning to compressor
    You could have a restricción piston or Txv
    Or not enough refrigerant
    You should have around 70 psi depending on Ambient temperature


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  3. #3
    Join Date
    Jun 2013
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    It could be a dirty air filter too


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  4. #4
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    26,198
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    Quote Originally Posted by gilbert450 View Post
    Hi Every one , I installed new compressor 5 ton R22 , starts good , runs about 45 minutes and trips on over heating. Return 55 psi and high at 200 , I dont know what is wrong with the unit it is taking 17 to 18 amps . Please advice me how to fix the problem ?
    So whatever killed the old compressor is about to kill this one!
    SH
    SC
    readings are needed!

  5. #5
    Join Date
    Jun 2013
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    What do you mean sh and sc



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  6. #6
    Join Date
    Apr 2003
    Location
    St. Louis
    Posts
    1,269
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    Dirty evap coil, blower wheel, not moving enough air, bad expansion device or dirty condenser running head up still short of gas.

  7. #7
    Join Date
    Oct 2019
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    Thread Starter
    Thanks guys , its scroll compressor , there is one more unit running smoothly its return is 55 and high is 200 as this one. maybe oil present in evaporator ?

  8. #8
    Join Date
    Jun 2013
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    Oh superheat 10 to 20 depends
    Sub cooling 8 to 15 but that’s just a quick reference


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  9. #9
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
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    Quote Originally Posted by ARIOSTO1 View Post
    Oh superheat 10 to 20 depends
    Sub cooling 8 to 15 but that’s just a quick reference


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    10-20 where!
    What’s the discharge temp?
    Have you run the performance curve #’s yet?

  10. #10
    Join Date
    Jun 2013
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    Ok 55 the other unit, but that’s not right maybe your gauges not reading properly
    55 R22 suction psi is too low


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  11. #11
    Join Date
    Oct 2019
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    Thread Starter
    one more thing one tech came inspected the unit , went up in the Attic to check " any foul play , disruption " that is causing this problem ?

  12. #12
    Join Date
    Jun 2013
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    Ok you should have 65 psi or more in your suction line reading for r22
    Once you are sure your airflow is good
    That involve
    Proper ductwork
    Clean evaporator
    Blower wheel clean
    Blower motor rpm and capacitor
    Clean filter
    Try adding r22
    If no changes.... you have a refrigerant restriction
    Did you installed liquid or suction line filters


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  13. #13
    Join Date
    Jun 2013
    Posts
    52
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    Condenser clean too


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