Furnace Thermostat Wiring

Modern thermostats with wi fi and backlit display by contrast need a steady supply of juice the c wire or common wire enables the continuous flow of 24 vac power to the thermo.

Furnace thermostat wiring. How to wire a thermostat. Label where the wires are connected on the thermostat check to see if they match the industry standard listed above. These run from the thermostat to the furnace and control the heat in a home. Heat pumps are different than air conditioners because a heat pump uses the process of refrigeration to heat and cool while an air conditioner uses the process of refrigeration to only cool the central air conditioner will usually be paired with a gas furnace an electric furnace or some other method of heating.

Furnace thermostat wiring diagram terminal letters on a thermostat and what they control the hot wire 24 volts usually red from the transformer is the main power wire to turn on or off a furnace components. It is a red wire and comes from the transformer usually located in the air handler for split systems but you may find the transformer in the condensing unit. Always turn off the power before starting work. By the use of an adjustable set point the job of the thermostat is to turn on either the heating or cooling system to maintain the desired room temperature in the home and to turn off the system when the desired temperature is achieved.

To wire a thermostat you must first be aware of the type of system that you have in your home. To wire a thermostat of this kind basic electrical skills tools and safety techniques are required. Back in the olden days thermostats were simple on off devices that didn t need their own continuous power supply. Thermostat wiring and wire color chart thermostat wiring colors code.

Two wire thermostats typically have a red and a white wire. To ensure our content is always up to date with current information best practices and professional advice articles are routinely reviewed by industry experts with years of hands on experience. Thermostat wiring diagrams for heat pumps heat pump thermostat wire diagrams. Turn off your existing thermostat flip the furnace ac breaker to the off position.

Once your c wire is ready follow these steps to install your new thermostat. A large majority of homes today have an hvac system containing a furnace oil gas or electric and an a c unit. Color of wire and termination. The thermostat wiring on these systems can have very similar wiring properties.

For example if the red wire is connected to w on the thermostat the furnace should turn on.