I am looking to find out what the wiring diagram is on the zone sensor. I have 4 wires on a terminal block marked 1,2,3,4. I want to know what each corresponding number does. Which one is the 24v, heat, cooling and fan. And do I have to use a compatible programmable thermostat with that unit? Right now there is just a non-programmable zone sensor which works fine but want to change it.