Furnace Limit Switch Wiring
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Step 4 insert the exposed conductor of the control wire into the no or the nc terminal and secure it by tightening the terminal retention screw with a screwdriver.
Furnace limit switch wiring. When the device is used both to control a furnace fan on and off as well as serve as a limit switch then all four terminals are used. This control can be wired to serve as a safety limit switch on a furnace by wiring just the limit terminals on the control. Remove 1 4 inch of insulation from the end of your control wire with diagonal pliers. A high temperature limit switch also called a fan limit switch or simply a limit switch is an important device used in forced air furnaces powered by gas or heating oil.
Benjamin sahlstrom 714 915 views. The control wire connects to the electrical device that the limit switch is intended to control. It shows the components of the circuit as simplified shapes and the power and signal connections amongst the devices. Simply put it senses the temperature of the furnace and tells the blower fan to turn on and off at the appropriate times.
It also can shut down the furnace burners if things are getting too hot inside the furnace. Wiring the furnace combination fan limit control using the honeywell l4064b as an example. Hvac relay fan limit switch wiring.
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