Aquatherm® air handlers and add - on hot water coils are also compatible with. Air handler that converts a properly sized gas or oil-fired water heater into a highly efficient, dual - purpose appliance that. They should have the color coded speeds marked on the diagram. Look behind the door of the air handler to see the wiring diagram. There are 2 brown wires which are capacitor wires, one white wire which is neutral, and probably red,black, and blue. There are probably six wires coming out of your air handler blower motor. Just contact me if you have something different. Thermostat: Y G R W and sometimes C Air handler: Y G R W and C Outdoor unit: two wires connecting to the contactor ( not heat pump) Thermostat Y-Y(air handler cooling)-one side of contactor, outdoor unit G-G (air handler, fan) R-R (air handler,hot) W-W (air handler, heat) C-C (air handler, common)-other side of contactor, outdoor unit This is a typical wiring diagram. I don't know if you have a heat pump or not, so I will give you a simple diagram and you can contact me if you need more.
Generally, you would go from the thermostat to the air handler, and then, from the air handler to the outdoor unit.
