Basic Gas Furnace Wiring Diagram

This is a safety precaution because the limit switch will open if the furnace gets too hot.

Basic gas furnace wiring diagram. To wire a thermostat you must first be aware of the type of system that you have in your home. Standard ac with standard furnace control wiring standard furnace standard thermostat standard a c condenser 1st stage heat white 24 volt fan only operation common air conditioning ac contactor control board 1 this diagram is to be used as reference for the low voltage control wiring of your heating and ac system. 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 reveals the parts of the circuit as streamlined forms and the power and signal links between the devices.

A wiring diagram is a simplified standard pictorial representation of an electric circuit. Tim uses the interactive wiring diagrams in hvac 3 0 to. How to wire a thermostat. Furnace wiring diagram electric furnace wiring diagram electric furnace wiring diagram sequencer furnace transformer wiring diagram every electric arrangement is made up of various distinct parts.

When the red wire is disconnected from w the. Electrical diagram training electrical symbols single and 3 phase power systems. Each component ought to be set and connected with different parts in particular manner. Otherwise the structure won t function as it ought to be.

The thermostat wiring on these systems can have very similar wiring properties. I show where the wires go at the thermostat the color code then down at the furnace control board and how to wire up the wires coming. Variety of gas furnace wiring diagram pdf. The line voltage feeding the furnace to operate the fan blower motor is transformed down to a safer level of 24 volts the gas control valve needs 24 volts to open and after making a series loop through at least one safety device the most basic and mandatory one is an over temperature shut down the power goes up to the thermostat and when the room temperature falls below the set point.

The gas is ignited by the pilot light and provides heat to the plenum of the furnace. Service sheet for the gas furnace gas furnace design the gas heat exchanger dangerous. When the thermostat closes it provides 24 volts to the gas solenoid which energizes and turns on the gas. The wiring diagram shows where the wires are mounted to the components and usually including wire color codes and sometimes numbers for wire identification.