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The power is supplied by a transformer, and when the thermostat makes contact between the 24 volt power and one or two of the other wires, a relay back at the heating/cooling unit activates the corresponding heat/fan/cool function of the unit(s).
Between the thermostat and the units is a low voltage set of wires that are connected to the thermostat control terminals and the terminal screws mounted within the furnace and air conditioners control terminal strip.These strips of terminals have markings on the to signify the heating connection, the cooling connection, the fan connection and heat ...