I want to know how to wire the 24 vac for the humidifier control. I have a oil burner furnace. It has 2 leads for the thermostat, and 2 for injector motor.I used my meter and the voltage for the injector motor reads 28 vac on 1 lead and 20.8 on the other. My question is do I need to use the transformer provided? and then need the model 50 current sensing relay? Or can I use the terminals on my furnace? The furnace is a Milwaukee thermaflo. It's in very good condition.