Furnace Wiring

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

Furnace wiring. 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. 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. This is a simple one about wiring the power to a gas or oil furnace. 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.

White wire for w terminal. The switch connects to the furnace inside a wiring box. This wire should go directly to the heating source whether it be a gas or oil furnace electric furnace or boiler or auxiliary heating for a heat pump. A wiring diagram is a streamlined standard pictorial depiction of an electric circuit.

This video is part of the heating and cooling series of training videos made to accompany my websites. Wiring a furnace thermostat is a fairly straightforward electrical job. Back in the olden days thermostats were simple on off devices that didn t need their own continuous power supply. A single sheathed cable runs from the circuit breaker to a single pole light switch located next to the furnace.

The thermostat is the control device that provides a simple user interface with the internal workings of your homes climate control system. It shows the parts of the circuit as simplified shapes and the power and also signal links between the gadgets. Brown 18 5 thermostat and the southwire 500 ft. 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.

This cable offers a flat design. You should be aware that this may have changed especially if the person who wired the thermostat didn t use conventional color coding. The blower and control circuit for a modern gas furnace uses its own 110 to 125 volt circuit breaker. The southwire 500 ft.

Brown 18 5 thermostat and bell cable is designed for use in heating and air conditioning controls as well as in alarm systems.