Wiring A Furnace Limit
Limit contacts are suitable for line voltage low voltage or millivoltage circuits.
Wiring a furnace limit. Follow furnace or burner manufacturers instructions if available. When fan motors quit or filters get neglected and plugged up then limit. The high-temperature limit switch is a small but important device used in forced-air furnaces powered by natural gas LP or heating oil.
To locate the sealed combustion chamber follow the gas piping from the gas valve to a box with a cover and an inspection window. The furnace pressure switch will always have flexible tubing running to it. For low voltage applications the brass jumper must be removed.
It turns the fan on and off during the normal heating cycles of the furnace and it senses heat and shuts down the furnace if the interior temperature gets too high. Limit switches turn off the burner and turn on the circulating fan if there is a high temperature condition in the furnace. A limit switch is a device thats located under your furnaces supply plenum.
The larger the number the smaller the wire. Honeywell Furnace Temperature Fan Limit Switch Control The fan limit control turns the fan on and off in furnace applications. Limit contacts are suitable for both line voltage and low voltage.
Limit control oil furnace limit switch wiring diagram installation operating and service manual forced air outdoor wood burning wood furnace issues energy mate Wood Furnace Best Fan In ThestylishnomadCom. The most common reason for limits to open is a plugged filter or a dirty blower wheel. On the limit control end remove the wire from the terminal using a small flathead screwdriver to release it.
If the temperature inside of the plenum gets too hot it shuts off the gas supply to your burners to prevent your. A limit switch also acts as a safety device for your furnace. Also known as the fan limit switch or simply the limit switch it has two functions in the furnaces operation.
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