The limit switch on your air conditioning or heating system is the link between the blower on your air handler and the thermostat. When the thermostat senses that the desired indoor temperature has been reached, it stops the air conditioner from producing any more cold air or the furnace burner from generating flames and heat. At that point, it’s important for the blower to stop functioning as well.
If it doesn’t, the air conditioning or heater blower will continue to move uncooled or unheated air throughout your home. However, if the blower shuts off too soon, the cold or hot air that’s still being generated by the air conditioner or furnace won’t be able to circulate. So it’s essential that the blower be switched off at the same time the cold or hot air stops arriving. That’s exactly what the limit switch does.
A limit switch is a safety device designed to shut down a piece of equipment. Limits have a set point, which is in some cases, adjustable. The set point prevents the temperature or pressure from exceeding the rating of the switch.
- Maximum Temperature: 140
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