547-500

This 7-inch adjustable fan switch is a high-performance control component designed for forced-air heating systems and HVAC units. Functioning as both a fan motor controller and a safety limit switch, it regulates the operation of the blower based on the air temperature within the furnace plenum. By precisely managing when the fan turns on and off, this switch helps maintain consistent indoor comfort while improving overall energy efficiency. The adjustable temperature settings allow for a tailored heating cycle, ensuring the blower only activates once the heat exchanger has reached the appropriate temperature and deactivates once it has sufficiently cooled. This part is essential for homeowners or technicians looking to repair furnace short-cycling issues or replace a faulty thermal limit control to ensure safe and reliable heater operation.
Type: HVAC Fan and Limit Control Switch
Size: 7-inch probe length
Dimensions: 7 in
Application: Used in forced-air furnaces and residential or commercial heating systems to control blower fan cycles and provide high-limit safety protection.
Specifications: Adjustable temperature range: L80-L120°F; Adjustable differential: 20°F-50°F; Features a 7-inch insertion probe for accurate plenum temperature sensing.