There are a variety of thermostat wire types. In either case it is crucial to find the wiring diagram for the unit.
F5b1 Heat And Cooling Thermostat Wiring Diagrams For Two 3
Hvac wiring diagram colors. C blue wire to the c terminal sometimes you will this. Finally this way you can match up the appropriate wire color coming from the thermostat to what it controls in the equipment. I discuss how to wire the contactor and what the difference is between the. The 5 strands of wire provide enough functions for the modern. The red wire should always come from the hot side of the 24 volt transformer. I explain what each of the letter terminals are for the voltage path how it works and also the normal color code used.
What the color code means for air conditioner and furnace thermostat wires. It is better to take a good up close photo of the old thermostat and what terminals the colored wiring are terminated. The most common is 185 5 strand 18 gauge. 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. O orange wire to the o terminal for the reversing valve altough a few manufacturers use the b terminal for the reversing. R red wire to the r terminal g green wire to the g terminal y yellow wire to the y terminal w white wire to the w term.
The main difference setting each apart is the number of colored wires. Hvac systems with more functions need more wires to communicate to and from the thermostat. This video is part of the heating and cooling series of training videos made to accompany my websites. Types of thermostat wire.
Gallery of Hvac Wiring Diagram Colors
