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Dual Run Capacitors for DIY RPC?

Discussion in 'ELECTRICAL ISSUES - POWER YOUR MACHINES & SHOP' started by Investigator, Jul 13, 2017.

  1. Investigator

    Investigator United States Active Member Active Member

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    I'm looking at options and need to know if I can use dual run capacitors in place of typical run capacitors in an RPC build.

    I think I can, by just connecting two wires, and not hooking up to the smaller uF terminal on the cap.

    Am I correct that a 30/5 uF dual run capacitor will have 30 uF hooked up to HERM and COM, and that it will have 5 uF hooked up between F and Com? So I could use a dual run and only use 2 of the connections on top?
     
  2. GA Gyro

    GA Gyro H-M Supporter - Premium Content H-M Supporter-Premium

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    Yes, that is correct... I would only use 440V rated caps... or higher if you find them.

    Having said that: HVAC and refrigeration grade run capacitors are not the best quality... I would have a couple of spares available.
    You can also connect the 30 + 5 together, along with the common, and have a 35uF cap.
    OTOH... not using the 5 segment, probably would put less load on the cap.
     
  3. Investigator

    Investigator United States Active Member Active Member

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    How do you tell the difference in HVAC/Refrigeration grade capacitors?
     
  4. GA Gyro

    GA Gyro H-M Supporter - Premium Content H-M Supporter-Premium

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    Most of the 'run' caps (single and dual value) I see, are HVAC/refrigeration quality (mass produced and sold very price competitive.
    Start caps seem to be better quality.

    IMO... this is a place to 'buy American'... :)
    As the cheap ones (read that low quality) are almost always from a place which is in a significantly different time zone than we are... grin!
     

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