A transformer for cooling and a transformer for heating. RC – The RC terminal is designated for the power for cooling. Red Wire for the R terminal - *You should be aware that this may have changed, especially if the person who wired the thermostat didn’t use conventional color coding. Lastly, if you have a package unit, then the transformer is in the package unit. For this reason, kill the power at the condenser and the air handler before changing or working on the wiring at the t-stat. 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.
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Thermostat Wire Colors Code | HVAC Control Thermostat Wiring and Wire Color Chart – Thermostat Wiring Colors Code Additionally, that could potentially cost you a service call for troubleshooting and repair. You may cause a dead short in the control circuit. Furthermore, the power for both the condenser and the air handler/furnace. Thermostat Wiring Colors Code - High Performance HVAC Thermostat Terminal Designationsīefore proceeding, we highly advise that you turn the power off at the circuit breaker. Refer back to this page for thermostat wire colors.
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However, these are the most wiring methods used based on my years of experience in the HVAC field, where I successfully wired a lot of thermostats and as recommended by manufacturers and common sense for thermostat wiring colors code.įor instructions on how to wire a thermostat, please see how to wire a thermostat page. Additionally, thermostat wiring colors are not standardized. There is no official standard for thermostat wire colors. Furthermore, the thermostat wire colors below are the most likely colors used for most installations however, your thermostat wire colors may be different than what the indication is here.Always turn the power off at the air handler and the condenser and make sure there is no voltage at the transformer before proceeding. Thermostat Wiring Colors Code | HVAC ControlĪlways follow the thermostat manufacturer’s instructions whenever changing the thermostat. Please check this article for a checklist of things to check before calling a heating and cooling repair service. Sometimes, the thermostat is not the problem. S1 and S2 Wires - connects to S1/S2 terminals and is for outdoor temperature sensor.X or Aux-Wire - connects to X terminal and is for auxiliary.E-Wire - connects to E terminal and is for Emergency heat.O or B-Wire - connects to O or B terminal and is for reversing valve operation.C-Wire - connects to C terminal (common 24v power) with the C wire.G-Wire - connects to G terminal and for fan operation with the green wire.W2-Wire - connects to W2 terminal and for heat stage 2.
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