Essentially this means that it determines when the hot air should be blown through your ventilation system.
Furnace blower fan switch.
It works off of temperature and also provides a high temperature safety limit this is a switch actually two switches which turns the furnace blower on and off based on the temperature of the heat exchanger.
Honeywell furnace temperature fan limit switch control the fan limit control turns the fan on and off in furnace applications.
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The fan limit control includes these key features a manually operated blower fan on off switch on some not all fan limit controls a temperature sensor in the furnace either a probe with bimetallic spring or a snap disc type temperature sensor.
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The fan limit switch also has two other functions.
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A fan control switch that turns the blower fan.
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A fan limit switch is a component of a furnace system that determines when the furnace blower assembly for hot air turns on and off.
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