Rib Relay With 2 Wire Thermostat Wiring Diagram. If you have one r wire connect it to rh at the idevices thermostat and leave the blue jumper in place to rc. The 24v transformer supplies power to the thermostat on the r terminal and the thermostat connects the r wire to w for heat y for cool and g for the fan.
Wiring diagram images detail. The rc840t relay has a built in 24 v transformer and is compatible with 3 wire r c w thermostats as well as 2 wire mechanical and battery operated thermostats. The 24v transformer supplies power to the thermostat on the r terminal and the thermostat connects the r wire to w for heat y for cool and g for the fan.
Wiring diagram pics detail.
How wire a honeywell room thermostat wiring connection tables hook up procedures for brand heating heat pump or air conditioning thermostats. Wiring diagram for dry contact relay. Wiring diagram pics detail. 90 340 white rodgers fan relay arnold s service co inc.