Summary
The letter R in a thermostat wiring system is responsible for powering the entire HVAC system through the use of a transformer.
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It may be accompanied by an Rh and an Rc wire, or just a lone Rh or Rc wire.
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According to
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Refer to the thermostat manufacturer's wiring diagram for precise connection information. G: The G terminal controls the fan relay and is responsible for turning the blower fan on and off…
Understanding the Terminal Letters on a Thermostat
thespruce.com
“RC” and “RH” are terminals on an HVAC thermostat , each with a specific function. They are used with HVAC systems with two separate transformers – one for cooling and one…
What Is RC and RH On A Thermostat?
thermostatguide.com
– TH-TR ( THermostat -TRansformer) terminal is the 24VAC from the transformer. (Important to note that this terminal does nothing for the gas valve. Its only purpose in life is to connect…
TH, TR, and TH/TR Gas Valve Terminals - HVAC School
hvacrschool.com