I am working on installing my new SQ225 and have a couple of questions. If I hook the heater up using Port B on the heat pump and the com port on the Intellicenter I am assuming that I can use both heat and cool mode correct? I had read something about installing a 10k resistor on the solar connector I think. Is this needed? Do I just connect each leg of the resistor to one side of the port? I also assume that if I use the heater block on the Intelcenter and the Y&Z terminals on the heater then I can only heat and not cool?