Furnace Control Wiring

Collection of gas furnace control board wiring diagram.

Furnace control wiring. The w terminal often the white wire will be the thermostats output for a heating call to the furnace sending the 24 volt power back to the furnace to its w terminal. This control can be wired to serve as a safety limit switch on a furnace by wiring just the limit terminals on the control. A wiring diagram is a simplified conventional photographic depiction of an electric circuit. The most basic of systems such as an older heat only forced air gas furnace with a standing pilot light only need two wires for control.

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. Notesome ac systems will have a blue wire with a pink stripe in place of the yellow or y wire. A wiring diagram usually provides details concerning the family member setting and also setup of gadgets and also terminals on the devices to assist in structure or servicing the tool. For example if the red wire is connected to w on the thermostat the furnace should turn on.

Always refer to your thermostat or equipment installation guides to verify proper wiring. It reveals the parts of the circuit as simplified forms as well as the power and signal connections in between the devices. Assortment of furnace control board wiring diagram. This diagram is to be used as reference for the low voltage control wiring of your heating and ac system.

In this video i show where all the wires go on this bryant furnace control board. That will power the relay contactor or complete the circuit in the circuit board. Red wire for air conditioner control power hot 1 the r terminal is the 24 volt hot feed from the control step down transformer. Please consider clicking below to help support our channel so we may keep bringing you.

They connect to a two wire thermostat generally a mechanical thermostat with a mercury filled ball connected to a coiled bi metal strip. Wiring diagrams are made up of two points. Icons that represent the components in the circuit and also lines that stand for the connections in between them. This allows a automatic control of the furnace to turn the fan on when the heat exchanger is warm enough.

A wiring diagram is a type of schematic which makes use of abstract pictorial symbols to reveal all the interconnections of parts in a system. When the device is used both to control a furnace fan on and off as well as serve as a limit switch then all four terminals are used.