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2. Control loop - Wikipedia

   en.wikipedia.org/wiki/Control_loop

   There are two common classes of control loop: open loop and closed loop. In an open-loop control system, the control action from the controller is independent of the process variable. An example of this is a central heating boiler controlled only by a timer. The control action is the switching on or off of the boiler.

3. Control system - Wikipedia

   en.wikipedia.org/wiki/Control_system

   A good example of this is a central heating boiler controlled only by a timer, so that heat is applied for a constant time, regardless of the temperature of the building. The control action is the switching on/off of the boiler, but the controlled variable should be the building temperature, but is not because this is open-loop control of the ...

4. Time switch - Wikipedia

   en.wikipedia.org/wiki/Time_switch

   A time switch (also called a timer switch, or simply timer) is a device that operates an electric switch controlled by a timer. Intermatic introduced its first time switch in 1945, which was used for "electric signs, store window lighting, apartment hall lights, stokers, and oil and gas burners." A consumer version was added in 1952. [1]

5. 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 ...

6. Open-loop controller - Wikipedia

   en.wikipedia.org/wiki/Open-loop_controller

   A good example of this is a central heating boiler controlled only by a timer, so that heat is applied for a constant time, regardless of the temperature of the building. The control action is the switching on/off of the boiler, but the controlled variable should be the building temperature, but is not because this is open-loop control of the ...

7. 6 Target Products Under $25 That Will Reduce Your Utility ...

   www.aol.com/finance/6-target-products-under-25...

   Using this programmable timer outlet can be really helpful for conserving energy and ultimately saving money on electricity bills. “Some electric devices, like refrigerators, require 24/7 ...