Fan Limit Control Switch Wiring

The furnace limit switch which will turnoff the burner if the temperature limit is reached is controlled by the two right connections red dots. If the fan limit switch worked normally continue as follows. One which opens the limit circuit if the plenum temperature exceeds the preset safety limit.

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These combination warm air fan and limit controllers are suitable for various types of forced air heating systems.

Fan limit control switch wiring.

The first thing you will want to notice is the length of the insert for the control. The fan or furnace blower motor is controlled by the two left connections green dots. Wiring diagram for fan limit switch. Wiring is also an issue from some fan limit switch controls as there are little details to be aware of when wiring a new fan limit control switch from the old one.

This control also provides a safety limit that turns off the burner or furnace if temperatures at the furnace are too high. Turn off electrical power to the heating system reconnect the fan motor where you previously disconnected it turn on electrical power to the heating system call for heat. The controllers have 2 switches. Some are 11 inches some are 8 inches and there are some that are 5 inches for the insert that.

The fan limit switch on a heating furnace controls when the furnace blower fan turns on and off. Fan limit control installation faqs. The other switch turns the fan on and off. Here the furnace limit switch is controlling a line voltage device.

Set the building thermostat to call for heat. Fan limit switches are used on all types of building heating furnaces. By admin march 14 2018. Fan limit control installation faqs honeywell furnace temperature switch heating how to install wire the controls on furnaces l6064 doityourself com community forums.

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