Hvac Wiring Colors

Basic thermostat wiring colors air conditioner systems always remember when changing a thermostat for a new thermostat to take a photo of the colors and where they go on the old thermostat or get a pencil and paper and write it down.

Hvac wiring colors. Video demonstrating the standard wiring for the primary blower motor found in most furnaces and air handlers in residential hvac. Modern thermostats with wi fi and backlit display by contrast need a steady supply of juicethe c wire or common wire enables the continuous flow of 24 vac power to the thermo. Well explained tutorial on wire color codes. Substitute g wire for c wire install the honeywell wi fi smart thermostat with this video duration.

The most common is 185 5 strand 18 gauge. You may cause a dead short in the control circuit. It is better to take a good up close photo of the old thermostat and what terminals the colored wiring are terminated. The main difference setting each apart is the number of colored wires.

Your best bet is to see the manufacturers documentation both thermostat and hvac. Thermostat schematic wire colors. While there isnt an official standard for thermostat circuit wiring colors there is a general pattern. Before proceeding we highly advise that you turn the power off at the circuit breaker.

Hope this helps a few folks out. There are a variety of thermostat wire types. Hvac systems with more functions need more wires to communicate to and from the thermostat. Thermostat wiring colors code high performance hvac thermostat terminal designations.

Furthermore the power for both the condenser and the air handlerfurnace. If you only have 4 wires they are typically red yellow green black.