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Your compressor is a dual voltage compressor. The original installer followed the instructions to switch it (probably internally) to the 230 volt setting or to internally wire it for that voltage. The label or information plate on the unit may only indicate the higher voltage rating. You don't have to do anything.

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Q: You need to connect a compressor which is rated at 240V ac but it is hooked up to a 120V power supply so you're uncertain on how that could be and how to connect the compressor?
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