Old Thermostat Wiring Color Code

Below is an industry standard thermostat wire color code complete with each wire s function. Each wire connects to a different terminal and is responsible for a different function. I explain what each of the letter terminals are for the voltage path how it works and also the normal color code used.

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The thermostat wiring color code guide from wi fi thermostat reviews.

Old thermostat wiring color code. Types of thermostat wire. This data can also be helpful if thermostat wires have become mixed up or improperly color coded by allowing you to trace wires back to their control connection point. I discuss how to wire the contactor and what the difference is between the. Lately the company that makes thermostat wire changed the colours around so older homes have the colours above but if you bought a spool of thermostat wire lately its going to be red white orange green blue are the new colours.

G fan usually a green wire r 24 vac usually a red wire rc and rh are discussed later c 24 vac common y compressor usually a yellow wire w heat usually a white wire. Thermostat wire reference chart. The main difference setting each apart is the number of colored wires. To install a new thermostat or repair an existing device you ll need to understand the different colors of wires.

Heat pumps use staging for auxiliary heat and need a w2 terminal the most common color ive seen used for this terminal and wire designation is brown but this varies and is completely up to the installer what color to use. The most common is 18 5 5 strand 18 gauge. Color of wire and termination. The 5 strands of wire provide enough functions for the modern.

Tuned the targeting for honeywell thermostat wiring color code deleted ad scripts added more related posts links and added tags. For the thermostat wiring colors code for this terminal if equipped consult with the installer or trace the wire out to. It is a red wire and comes from the transformer usually located in the air handler for split systems but you may find the transformer in the condensing unit. Thermostat wiring and wire color chart thermostat wiring colors code.

R the r terminal is the power. The usual terminals are. Hvac systems with more functions need more wires to communicate to and from the thermostat. How to wire a thermostat.

Skip navigation sign in. Well explained tutorial on wire color codes. Knowing what each thermostat wire does can help in wiring up a new or replacement room thermostat. This article explains just what wire at a room thermostat actually controls.

There are a variety of thermostat wire types. Heat pump thermostat wire color code duration. Well explained tutorial on wire color codes. This is often referred to as a 1h 1c conventional thermostat terminal designations.