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If an extension cord is required, use only a heavy duty cord rated for 15 amps minimum . No other major electrical appliance should be operating on the same circuit. How To Operate Your Heater NOTE: Before operating heater, HEATER INSPECTIONSteps 1 through 3 must be completed: 1) Plug the electrical cord into a 120 volt (AC) outlet. The plug should fit tightly into the receptacle for a proper electrical connection. 2) Rotate the thermostat control knob clockwise until the light illuminates, indi