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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).
First, the thermostat senses the presence of heat. Second, by sensing the presence of heat, the thermostat can control electrical current that is sent to another thermostat or to a heating element. A water heater may contain one or two thermostats, called upper and lower thermostats.In this configuration, each thermostat controls one heating element. A residential electric water heater may operate in a simultaneous or non-simultaneous mode. water heater may contain one or two thermostats, called upper and lower thermostats. In this configuration, each thermostat controls one heating element. A residential electric water heater may operate in a simultaneous or non-simultaneous mode.