19 Two-stage furnace and two-stage AC configuration IMPORTANT! The B terminal is for reversing valve-heat. DO NOT connect the B terminal to the common side of the transformer. ViewStat Communicating Thermostat 27J ViewStat Installation and Wiring NOTE Roof top unit (two-stage heat and two-stage cool) configuration. ROOF TOP UNIT 120 ;i VAC ie: гЩ i I VAC ....... FAN RELAY Black (common) (from MiniVerter) 24V FIELD WIRING FACTORY WIRING OPTIONAL 24V FIELD WIRING (SEE NOTE)

Drafts from inside the wall could affect temperature readings. 3. Fasten the base to the wall with the supplied screws. 4. Seal the wire entry with caulk, drywall putty, or insulation. Wiring the Thermostat Note: A qualified HVAC technician should perform these steps to ensure proper termination. 1. Make sure the HVAC system power is off. 2. Strip 1/4" (0.63 cm) of insulation from each wire you are using. 3. Secure the wires into the terminals on the base according to the appropriate wiring diag