I have a three ton Payne heat pump with 15kW heat strips (little insulation in the house). Presently, the fan drives the low speed on the blower motor. When the first stage of strip heat is called for, it drives the blower at medium speed. Clearly at this point, the blower motor is being driven on both the low and medium speed lines. Does the higher speed (medium) take precedence even though the low is being driven as well. I need high speed for the full 15 kW. If I just drive the high speed blower line will it take precedence over the two lower speeds even though they are being driven at the same time?