If you have a dual-fuel system, or are unsure, pause and contact a Professional HVAC Contractor.įollow the instructions below to guide you through basic wiring: *Trade model thermostats must operate “dual-fuel” systems, which use a heat pump for the first 1 or 2 stages and a gas or oil furnace for backup/emergency heating. O/B – Reversing valve for Heat Pump systems U – Humidifier, Dehumidifier, or Ventilator control See the diagram below for the role of each wire in your system: The thermostat uses one wire to control the primary functions of your HVAC system, such as heating, cooling, and fan.
Consult your owners/install guide for wiring examples and systems compatible with your thermostat*.
If you don’t know to which terminal each wire connects, it may be necessary to go to the HVAC system and look at the designations on the control board. When wiring, each wire should be identified by what terminal(s) it connects to - never by color. *There is no standard for which color wire controls each function.
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