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2. 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 ...

3. HVAC control system - Wikipedia

   en.wikipedia.org/wiki/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 taken (e.g. start the ...

4. 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.

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. California busts 117 sticky-fingered grinches in organized ...

   www.aol.com/177-sticky-fingered-grinches-busted...

   Authorities in California have busted 117 sticky-fingered grinches who were part of an organized holiday shoplifting ring. California Highway Patrol recovered 767 stolen items worth more than ...

7. Ohio State loses second starting offensive lineman for season ...

   www.aol.com/sports/ohio-state-loses-second...

   Ohio State’s offense is averaging 5.3 yards per carry this season and over seven yards a play. The Buckeyes have been powered by a run game that features both TreVeyon Henderson and Quinshon ...