You can skip this step if you have a digital thermostat with a blank display. If you don’t hear or feel the system turn on within 5 minutes, the power is off. To confirm your system is off, change the temperature on your existing thermostat, so the system starts heating or cooling. To protect your equipment, turn off the power at the breaker box or switch that controls your heating and cooling. 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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