What Do The Letters On A Thermostat Mean

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What do the letters on a thermostat mean? The jumper between rh and rc is required for some heating and cooling hybrid systems if you only have a single red wire. Letters on the terminals refer to functions. The term r refers to transformer power, which is usually 24v ac.

W is heat, while c is common. People also wonder what rh and rc on a thermostat mean. Contrary to popular belief, the letters do not correspond to wire colors, but rather are used to indicate the various function signals controlled by each wire. How do i test my home thermostat? Turn off hvac power. What do the different letters mean on a thermostat? If you only have a single red wire the jumper between rh and rc are required for some heating and cooling hybrid systems depending on your thermostat. Yellow/y is the ac compressor. White/w is the heating element.