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  2. Central heating - Wikipedia

    en.wikipedia.org/wiki/Central_heating

    The heating elements activate one at a time to avoid overloading the electrical system. 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.

  3. Pressure switch - Wikipedia

    en.wikipedia.org/wiki/Pressure_switch

    A pressure switch is a form of switch that operates an electrical contact when a certain set fluid pressure has been reached on its input. The switch may be designed to make contact either on pressure rise or on pressure fall. Pressure switches are widely used in industry to automatically supervise and control systems that use pressurized fluids.

  4. Carrier Global - Wikipedia

    en.wikipedia.org/wiki/Carrier_Global

    In the 1990s, Carrier stopped using the "Day & Night" brand (which was the "D" in the BDP division, or Bryant-Day & Night-Payne) but it was revived in 2006 by ICP. In 2001, Carrier was the "world's largest manufacturer of air-conditioning, heating, and refrigerator equipment" with a "total employment of 42,600" and a revenue of $8.9 billion ...

  5. Sail switch - Wikipedia

    en.wikipedia.org/wiki/Sail_switch

    A sail switch, vane switch or flow switch is a mechanical switch that is actuated on or off in response to the flow or non-flow of a fluid such as air or water. [1] A sail switch typically operates through the use of a paddle or a diaphragm which gets displaced due to the force of fluid or air moving past it.

  6. Carrie Furnace - Wikipedia

    en.wikipedia.org/wiki/Carrie_Furnace

    Carrie Furnace is a retired blast furnace located along the Monongahela River in the Pittsburgh area industrial town of Swissvale, Pennsylvania. It was one of the structures comprising the Homestead Steel Works. The Carrie Furnaces were built in 1884 and they operated until 1982. During its peak, the site produced 1,000 to 1,250 tons of iron ...

  7. Limit switch - Wikipedia

    en.wikipedia.org/wiki/Limit_switch

    A limit switch with a roller-lever operator; this is installed on a gate on a canal lock, and indicates the position of a gate to a control system 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.

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