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.
Furnace blower fan switch.
The fan limit switch also has two other functions.
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Honeywell furnace 11 combo fan limit switch l4064b2828 l4064b2954 l4064b3036.
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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Honeywell furnace temperature fan limit switch control the fan limit control turns the fan on and off in furnace applications.
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Essentially this means that it determines when the hot air should be blown through your ventilation system.
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Oem honeywell furnace 5 fan limit rotating dial switch l4064e1686.