3/10/2023 0 Comments Transformer wire color codes![]() ![]() *Although be aware that this may have changed especially if the person who wired the thermostat didn’t use conventional color coding. It should be noted that a jumper can be installed between RC and RH for a heating and cooling system equipped with a single transformer. In this case, the power from the transformer in the air conditioning system would go to the thermostat terminal. A transformer for cooling and a transformer for heating. RC – The RC terminal is designated for the power for cooling. If you have a package unit then the transformer is in the package unit. ![]() For this reason, it is a good idea to kill the power at the condenser and the air handler before changing or working on the wiring at the tstat. This 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 Wire Colors Code | HVAC Control Thermostat Wiring and Wire Color Chart – Thermostat Wiring Colors Code Always make sure you have the right tools and materials for the job.
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