My dad bought a Max Caddy made by PSG and we are doing some of the instillation ourselves because the install guys are booked weeks out. We've got most of the wiring done, but am having trouble wiring the thermostat. The furnace is going in as a wood only set up and it came with a braeburn 1000NC Thermostat. The thermostat can be battery operated and near as I can tell only needs one wire going to the furnace PC Board. Just wondering it this is right or if I am missing something? The wiring diagram for the pc board on the furnace shows two wires but they are not labled and I dont know what the second one would be or where it should go in the thermostat?