Hi James, the AD531 has either a 3 or 4 Kw motor, depending upon what you purchased.
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The 20 ampere circuit is fine for the 3Kw motor, if you have the 4 Kw motor I would recommend trying it on the 20A circuit, if it starts fine it will run fine.
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If not install a 30 ampere circuit.
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Regards, Rod.
rodsheridan