Response to Check the SF on the old and new motor. The product of the SF and HP has to match. If your old motor has a SF of 1.0, its actual HP is 1.5 (1.5 HP x 1.0 SF). If that's true you should replace it with 1 HP dual speed motor (STS1102). With a SF of 1.5, its actual HP is 1.5 (1.0 HP x 1.5 SF). Also be aware that you will have to buy a hi/lo switch. It is not provided with the motor.

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