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  1. #1
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    Residential HVAC tech has question

    I sometimes repair domestic refrigerators. The last one had a defective motor start relay. It is a klixon, the compressor motor is a induction start and induction run. No capacitors.

    I went to an parts house and the counter help said we recomend to put a start capacitor in place of the relay. He said thats what all the appliance techs do, it's cheaper.

    I like to allways go back with OEM parts. I would think the start winding maybe damaged by the start cap. I know the start winding are dropped out by the relay, and the start cap has a relay.

    What do the refer techs say? Is it y'all policy to skip the relay and just put in a start cap?

    Thanks,
    STUD

  2. #2
    Join Date
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    Some appliance motors use a centrifugal switch to drop out the start winding.

    That said is is it any different putting a start relay on that motor than putting a hard start on a compressor ?

  3. #3
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    I would think a PSC motor would be built with stronger windings and can handle a hard start.

    A small HP IS/IR motor would not be built to handle a start cap.

    The key is to drop out the start winding. My question is it normal for ref tech to use a hard start instead of OEM relay to take out start winding.


    STUD

  4. #4
    Join Date
    Mar 2007
    Posts
    543
    Back when I did work on res. refrigerators, I would normally use a Supco RO-81 or 41 to replace the start components. Other options were a IC-G1 relay and a RSC-10 (when the others wouldn't work).

    Don't remember ever using oem relays.

  5. #5
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    When my PTCR decided to break into several small pieces on my home unit, I installed a 3 in 1, and it has worked great ever since.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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  6. #6
    Join Date
    Oct 2011
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    Chicagoland Area
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    Quote Originally Posted by timebuilder View Post
    When my PTCR decided to break into several small pieces on my home unit, I installed a 3 in 1, and it has worked great ever since.
    this
    Officially, Down for the count

    YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET

    I know enough to know, I don't know enough
    Liberalism-Ideas so good they mandate them

  7. #7
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    I don't put a start cap in when all you need is a relay.
    Seems like a waste of a start cap.

    I deal mostly with PSC motors, not induction start and induction run. Sometimes a shaded pole.

    I was just wondering what refrigeration pro's do when relays fail.

    STUD

  8. #8
    Join Date
    Nov 2006
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    Southeastern Pa
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    Quote Originally Posted by HVAC/Stud View Post
    I don't put a start cap in when all you need is a relay.
    Seems like a waste of a start cap.

    I deal mostly with PSC motors, not induction start and induction run. Sometimes a shaded pole.

    I was just wondering what refrigeration pro's do when relays fail.

    STUD
    That's what "I" did. Because of what I know about this stuff, and how the refrigerator is designed. I also knew that the PTCR was a cheap production cop-out, when in reality, they should have used a potential relay.

    Use the 3-in-1, and you're done.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







  9. #9
    Join Date
    Nov 2007
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    Sherman, TX
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    Quote Originally Posted by timebuilder View Post
    Use the 3-in-1, and you're done.
    Yup

    I used dozens of these while running service on ice merchandisers in the 80's and 90's....

    Just one part to carry on your truck, no ordering, no waiting....
    Technical incompetence is NOT a sales tool....

  10. #10
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    Do you leave the external overload on. The start cap doesn't include a over temp safety. Its dropped out of the system.

    If you remove O/L and install the start cap, where is your compress safety?

    STUD

  11. #11
    Join Date
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    Quote Originally Posted by HVAC/Stud View Post
    Do you leave the external overload on. The start cap doesn't include a over temp safety. Its dropped out of the system.

    If you remove O/L and install the start cap, where is your compress safety?

    STUD
    That's EXACTLY what I did, left the factory overload on there....
    Technical incompetence is NOT a sales tool....

  12. #12
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    Quote Originally Posted by HVAC/Stud View Post
    Do you leave the external overload on. The start cap doesn't include a over temp safety. Its dropped out of the system.

    If you remove O/L and install the start cap, where is your compress safety?

    STUD
    The 3 in 1 has an overload.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







  13. #13
    Join Date
    Jun 2012
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    az
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    Can never go wrong with oem.

    Sent from my SCH-I510 using Tapatalk 2

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