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Bench test a 3 in 1

Bench test a 3 in 1

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Thread: Bench test a 3 in 1

  1. #1
    Join Date
    May 2013
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    1,465

    Default Bench test a 3 in 1

    Model - frs23r4cw0
    Serial - la31516278
    If this 3 in 1 is attached to the refrigerator, shouldn't it show voltage beteen the common and the start and run leads? Okay, from looking at the wiring diagram, it looks like the line is coming from the Freezer Control,Adaptive Defrost then to the compressor and the condenser fan. Since neither the fan nor the compressor is running, I guess I need to check these other parts. BUt, I have a feeling the compressor is stuck. Someone had already put a 3 in 1 on it at some point. When I apply power directly to the compressor, it seems to only hum and the fan still does not come on.

    When I ohmed the compressor, my readings were like 003,005 and 008 or something close. The start and run total is pretty close to the separate readings to the common. But I would think the readings should be 3.**, 5.**, and 8.** or something close to that.

    Comments appreciated.

    Thanks

  2. #2
    Join Date
    Feb 2012
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    Canada
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    Default

    If this 3 in 1 is attached to the refrigerator,
    Shouldn't use a 3-1 on a PTC start compressor.

    When I ohmed the compressor, my readings were like 003,005 and 008 or something close. The start and run total is pretty close to the separate readings to the common. But I would think the readings should be 3.**, 5.**, and 8.** or something close to that.
    Windings sound correct, could be mechanically locked up if the compressor will not start when direct powered.

    shouldn't it show voltage beteen the common and the start and run leads?
    It should...unless the relay is bad. Does it show 110-120 volts AC to the 2 black wires?

    from looking at the wiring diagram, it looks like the line is coming from the Freezer Control,Adaptive Defrost then to the compressor and the condenser fan. Since neither the fan nor the compressor is running, I guess I need to check these other parts.
    Neutral right from the power plug, line is from temp control, adaptive defrost board to the fan and compressor...

    Bench test a 3 in 1-xu4xjdpd-jpg

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

  3. #3
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    Default

    Shouldn't use a 3-1 on a PTC start compressor.
    Yep, I remembered you telling me this when I saw this.

    could be mechanically locked up
    That is what I am thinking. Either that or it runs with a very quiet hum and very little vibration.

    It should...unless the relay is bad. Does it show 110-120 volts AC to the 2 black wires?
    i will recheck, but I think I disconnected the wires that were going to the relay and got nothing. This is when I started to suspect one of the other parts shown in the diagram.

    I was a little disappointed when I saw someone had already installed the 3-in-1.
    I guess it will go to the scrap yard.

    If I use a cheater wire on the compressor, should I let it start then pull the start lead off? I had a cheater wire with two lines coming off the hot side and one on the neutral side. I would connect the neutarl to the Common terminal on the compressor and the hots on the Start and Run terminals.

  4. #4
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    Default

    If I use a cheater wire on the compressor, should I let it start then pull the start lead off?
    Yes.
    You can also install a switch....hold for start, let go and the start is removed.
    In a PTC relay the start and run are always energized with the run capacitor.....might even be a good idea to make a test cord with the relay, overload and capacitor.

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

  5. #5
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    Default

    If it was just the compressor or relay, shouldn't the fan still come on?

  6. #6
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    It should be on yes.

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

  7. #7
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    Default

    Okay, the evaporator fan runs but the condenser fan does not. If I can figure how to get this thing apart, I will check the other parts out.

  8. #8
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    Check defrost board for sure.

    Bench test a 3 in 1-r0305035-00005-png



    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

  9. #9
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    Default

    Trying to get to it. The 1/4" nut driver does not seem to want to work. Someone ma have changed them, hard to see. How do I go about checking this board?
    I did unknowingly remove the screws holding the board itself.

  10. #10
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    Default

    Well, the cold control checks open. Can I cross the two wire to see if the compressor and condenser fan come on?

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