What causes a limit switch to "trip" if there isn't a fire

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Browning 2VP65X 1 1/8 Sheave R-410A What causes a limit switchThe Browning 2VP65X 1 1 8 is a heavy duty, VP series variable pitch sheave designed for precision air handling and industrial power transmission. Engineered from high grade cast iron, this two groove component features a 6. 50" outside diameter and a 1 1 8" finished bore with a standard keyway. This HVAC pulley allows for infinite adjustments to fan speeds and blower RPMs, providing a variable pitch range of 4. 9" to 6. 4" depending on the belt