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Thread: Wiring diagrams

  1. #1
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    Wiring diagrams

    I'm trying hard to get better at wiring diagrams. I'm using an ice machine at work to learn on, and the wiring diagram for it found online (ice o matic). One question that I have...is it common that a manufacturer to switch the neutral/common wire rather than the line side of a component to turn that component on/off? I know that's not commonly done with residential and commercial wiring, but when reading the schematic for this ice machine it seems it sometimes happens. Is this something that is common in hvac/r electrical design? Or is this never done, and I'm reading the schematics incorrectly?

  2. #2
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    Its done lots.... not sure why ... your probably reading correctly

  3. #3
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    is this 120v?, 220v?

    are you meaning neutral (120v)
    It`s better to be silent and thought the fool; than speak and remove all doubt.

  4. #4
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    Quote Originally Posted by dandyme View Post
    is this 120v?, 220v?

    are you meaning neutral (120v)
    Yes, the neutral (or common) wire. And it's 120...

  5. #5
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    Here's the diagram. http://www.iceomatic.com/uploadedFil...SERVICE910.pdf

    I'm interested in learning about the Low pressure initiate. If you look at how it is wired, you'll see that a wire goes from the COM terminal on the relay, to the low pressure initiate, then to the timer. From the timer, the wire goes back to the coil on the relay. If the low pressure initiate and timer both close, there is a complete circuit on the relay coil and it will pull in. But, what's confusing to me is that the line side of the relay coil is always hot...it's only the neutral side that's switched. I have to admit, I'm not as good with schematics as a lot of poeple, but I've only begun to learn....

    Edit: Just realized I posted the whole service manual. The diagram is on page "G1"...

  6. #6
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    Never mind
    With your chrome heart shining in the sun, long may you run.

  7. #7
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    the "com" you are looking at is "common" to the poles in that switch not common as in neutral


    that "com" is "hot"
    It`s better to be silent and thought the fool; than speak and remove all doubt.

  8. #8
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    Quote Originally Posted by dandyme View Post
    the "com" you are looking at is "common" to the poles in that switch not common as in neutral


    that "com" is "hot"
    Ah, I looked again and you're right. God, I hope I will get these sooner or later...need to get the lingo down pat first, I guess. Knowing what "COM" meant in that situation, for ex...

    Thanks for the help.

  9. #9
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    just takes time, don't know of anyone who "knew it" to begin with.
    It`s better to be silent and thought the fool; than speak and remove all doubt.

  10. #10
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    I think it great your being pro active. So many techs just learn on the job nowadays and let the customer pay for the training time.

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