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Problem: How do I wire up a dual capacitor that I purchased from you?

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Problem: I forgot how to wire up the dual round capacitor that I purchased from you. How do I go about wiring it up so it doesn’t blow the capacitor up again? How do I wire up a dual capacitor?

Answer: Thanks for your interest in our website! You would need to look at the wiring diagram that came with the unit. Usually, the wiring diagram is glued to one of the panels on the air conditioner. Hope you can read it. Rule of thumb on wiring the capacitor is: Herm on capacitor goes to the start winding on the compressor, Fan on capacitor goes to brown fan wire that goes to the fan, and Com on the capacitor comes off one leg of the contactor to provide power to the capacitor. There is usually more than one wire connected to the Com terminal. The Com terminal is used so other components of the air conditioner can steal power off the Com connection like the fan motor. Please click here if you would like to see the run capacitors that we sell.  Below we have a Youtube video made by fixmyownac which shows how to change a run capacitor on an air conditioner unit. Thanks so much, fixmyownac for making this video! We also have a really good YouTube video on how to read air conditioner diagrams or schematics that was made by HVAC School. Thanks so much to HVAC School for making this video. If you have any questions please email us anytime. Our email address is

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