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  2. Limit switch - Wikipedia

    en.wikipedia.org/wiki/Limit_switch

    A limit switch mounted on a moving part of a bridge. In electrical engineering, a limit switch is a switch operated by the motion of a machine part or the presence of an object. A limit switch can be used for controlling machinery as part of a control system, as a safety interlock, or as a counter enumerating objects passing a point. [1]

  3. Central heating - Wikipedia

    en.wikipedia.org/wiki/Central_heating

    Overheating is prevented by a safety switch called a limit controller or limit switch. This limit controller may shut the furnace off if the blower fails or if something is blocking the air flow. The heated air is then sent back through the home through supply ducts. In larger commercial applications, central heating is provided through an air ...

  4. Programmable logic controller - Wikipedia

    en.wikipedia.org/wiki/Programmable_logic_controller

    SCADA. v. t. e. A programmable logic controller (PLC) or programmable controller is an industrial computer that has been ruggedized and adapted for the control of manufacturing processes, such as assembly lines, machines, robotic devices, or any activity that requires high reliability, ease of programming, and process fault diagnosis.

  5. Mercury switch - Wikipedia

    en.wikipedia.org/wiki/Mercury_switch

    A mercury switch is an electrical switch that opens and closes a circuit when a small amount of the liquid metal mercury connects metal electrodes to close the circuit. There are several different basic designs (tilt, displacement, radial, etc.) but they all share the common design strength of non-eroding switch contacts.

  6. Heat pump - Wikipedia

    en.wikipedia.org/wiki/Heat_pump

    Effective immediately, American households are eligible for a tax credit to cover the costs of buying and installing a heat pump, up to $2,000. Starting in 2023, low- and moderate-level income households will be eligible for a heat-pump rebate of up to $8,000. [106] In 2022, more heat pumps were sold in the United States than natural gas furnaces.

  7. HVAC control system - Wikipedia

    en.wikipedia.org/wiki/HVAC_control_system

    HVAC control system. HVAC (Heating, Ventilation and Air Conditioning) equipment needs a control system to regulate the operation of a heating and/or air conditioning system. [1] Usually a sensing device is used to compare the actual state (e.g. temperature) with a target state. Then the control system draws a conclusion what action has to be ...

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