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  1. #14
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    Quote Originally Posted by Phase8 View Post
    Can never go wrong with oem.

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    I would say that when a resi fridge has a broken PTCR, the one thing you DON'T want to do is install another PTCR.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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  2. #15
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    Quote Originally Posted by timebuilder View Post
    I would say that when a resi fridge has a broken PTCR, the one thing you DON'T want to do is install another PTCR.
    Why?

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  3. #16
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    Quote Originally Posted by Phase8 View Post
    Why?

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    Simply put, a PTCR in this kind of application is a manufacturer compromise to save money, when a proven, better method, used for years, is readily available.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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  4. #17
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    Quote Originally Posted by timebuilder View Post
    Simply put, a PTCR in this kind of application is a manufacturer compromise to save money, when a proven, better method, used for years, is readily available.
    What is the best way?

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  5. #18
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    Quote Originally Posted by Phase8 View Post
    What is the best way?

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    A potential relay gives better performance and repeatability than a PTCR, and a 3-in-1 is a great choice in that situation.
    [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. #19
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    Quote Originally Posted by timebuilder View Post
    A potential relay gives better performance and repeatability than a PTCR, and a 3-in-1 is a great choice in that situation.
    yep. most oem start relays go out due to very short power outages. The power flickers, there is no delay on fridges that dont have the microprocessor board, so the unit tries to start back up...over and over and over. Sometimes it takes 10 minutes for the pressures to equalize in a domestic fridge and the whole time the unit is trying to start up under pressure. It eventually overheats and breaks the little disc inside the oem relay.

  7. #20
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    Okay, I have definitely learned something. Thank you.

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  8. #21
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    A couple of things: A 3 in 1 (like a Supco) IS a PTC start device. Also, the "klixon" used with standard starting components is an overload, not a relay. It intentionally overheats when there is a high amp draw across it and opens the circuit until it cools down. It does not provide any measurable thermal protection for the compressor itself. Thermally protected devices have switches mounted within the motor windings.

    There is nothing better than the OEM current or potential relay. I use 3 in 1's fairly often, but I will replace all starting components with OEM in most circumstances.

  9. #22
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    Also, I have never heard of an "induction start, induction run" motor.

  10. #23
    Join Date
    Jun 2012
    Location
    Tenn
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    139
    "My question is it normal for ref tech to use a hard start instead of OEM relay to take out start winding."

    The company that I work for has that for a policy. Personally, I would only use it for the last ditch troubleshoot before condemning the compressor, but, I work for a company with that policy, and it is a viable option as it includes thermal overload, relay and start cap.

  11. #24
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    Quote Originally Posted by MicahWes View Post
    A couple of things: A 3 in 1 (like a Supco) IS a PTC start device. Also, the "klixon" used with standard starting components is an overload, not a relay. It intentionally overheats when there is a high amp draw across it and opens the circuit until it cools down. It does not provide any measurable thermal protection for the compressor itself. Thermally protected devices have switches mounted within the motor windings.

    There is nothing better than the OEM current or potential relay. I use 3 in 1's fairly often, but I will replace all starting components with OEM in most circumstances.

    I'm not able to find a sheet that reveals this information. My supply house said it's a relay.

    Can you give me a link to something?
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

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  12. #25
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    Mar 2007
    Location
    NW AR
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    The white piece that goes on common is an overload. It will say klixon. The other piece, with the disc in it, is the relay. It is usually black or brown, sometimes white on certain models.

    http://www.partselect.com/PS2004058-...-Relay-Kit.htm

  13. #26
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    Quote Originally Posted by ar_hvac_man View Post
    The white piece that goes on common is an overload. It will say klixon. The other piece, with the disc in it, is the relay. It is usually black or brown, sometimes white on certain models.

    http://www.partselect.com/PS2004058-...-Relay-Kit.htm

    I'm talking about the Supco type unit, the 3-in-1 or one of their similar units..

    The PTCR is usually a tablet-sized chunk of semiconductor material. I usually see them fall out in pieces when I take to cover off of the side of the compressor.
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    2 Tim 3:16-17

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