Some manufacturers put a terminal board strip near the control board in the air handler so a splice is not needed. Typically a thermostat wire pull is made to the air handler on split systems and then this wire is spliced for the separate wire pull which is made to the condenser. The Y terminal is for cooling or air conditioning and goes to the compressor relay. It should be noted that a jumper wire 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 RC. Some HVAC systems consist of two transformers, one for cooling and the other for heating. The RC terminal is designated to the cooling power source. See RC below for an explanation for the cooling.Ĭan be installed between RC and RH for a heating and cooling system equipped with a single transformer. – The RH terminal is designated for the power for heating when two transformers are used. For this reason, we advise turning off the power before adjusting the thermostat's wiring. This 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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