The thermo-electric actuator is installed on the underfloor heating manifolds and controlled remotely by room thermostats to open or close valve for individual circuits/loops.
For a normally closed (NC) thermo-electric actuator, the valve being controlled stays closed when the actuator is powered off. When there is a demand to increase the room temperature from the thermostat, the thermo-electric actuator powers on. The thermal actuator inside the thermo-electric actuator starts heating up, and its piston pushes out as the wax expands. Then the valve is opened, and the hot water starts to flow in the corresponding circuit/loop for this room. As the result, the room temperature increases gradually to reach the set value on the thermostat.
The thermo-electric actuator powers off when the room temperature reaches the set value. The thermal actuator inside the thermo-electric actuator cools down. Then the piston returns to its initial position with the assistance of the return spring to close the valve. The hot water stops flowing in the circuit/loop as the valve is closed.
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