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Thread: capacitors

  1. #1
    Join Date
    Aug 2004
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    Is there a way to size run & start capacitors for compressors if you have a situation where there are no original capacitors?

  2. #2
    Join Date
    Aug 2003
    Location
    Fort Worth, TX
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    I would find compressor manufacturer's data and extract the information from that. Or get a parts house book and see if it provides capacitor info with the model of compressor you're working with. Johnstone's catalog is good about listing start and run caps with the single phase comps, plus which start relay to use.
    Building Physics Rule #1: Hot flows to cold.


    Building Physics Rule #2:
    Higher air pressure moves toward lower air pressure


    Building Physics Rule #3:
    Higher moisture concentration moves toward lower moisture concentration.

  3. #3
    Join Date
    Sep 2002
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    South Dakota
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    Originally posted by cbd33
    Is there a way to size run & start capacitors for compressors if you have a situation where there are no original capacitors?

    Yes, but you need an oscilloscope, a good command of trig, the equations and time. That is what the compressor manufacturers do when they determine the correct capacitor sizes. Get the information from them.


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