The thermostat generates signals, usually electrical, to activate relays, valves, switches, and so on when the temperature rises above or falls Below the desired value.
恒温器包括继电器、阀门、电门等，当恒温器高于或低于所需的数值时，恒温器就发出信号，通常为电信号。
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IMPORTANT: Removal and replacement of the thermostat involves the disconnection of electrical connections.
重要：温控器的拆卸和更换涉及到电路连接的断开。
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Nasa engineers were not sure at first whether the heater's reluctance to operate was a simple thermostat failure or a more deep-seated issue in an electrical switchbox.