![]() ![]() Y - This is the terminal for cooling or air conditioning and goes to the compressor relay. 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. RH - The RH terminal is designated for the power for heating. 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 thermostat. This comes from the transformer usually located in the air handler for split systems but you may find the transformer in the condensing unit. ![]() R - The R terminal is the power for the thermostat. Installation Basics - HVAC Air Conditioning & Heating Systems
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