Westinghouse 626612R Main Air Limit Switch Furnace

Product Description

The WESTINGHOUSE 626612R is a main air limit switch designed for use in upflow and horizontal gas furnaces. This safety device monitors supply air temperature and opens the circuit to the burner controls when the air temperature reaches the set open point, protecting the heat exchanger and surrounding components from overheating. It resets automatically once the temperature drops to the close point. Licensed HVAC technicians install and replace this component during routine maintenance or in response to nuisance limit trips caused by airflow restrictions or failed blower motors.

The 626612R is specified for use on Westinghouse G7SA, G7SA-1, and G7SD upflow and horizontal furnace models. This type of limit switch is a direct-replacement safety control typically found in residential gas furnace applications. It is positioned in the supply air plenum or heat exchanger compartment where it can accurately sense discharge air temperature.

Key Features

• Opens circuit at 135 degrees F to shut down burner on high-temperature condition
• Resets at 165 degrees F close point for automatic recovery
• Main air limit function protects heat exchanger from thermal stress
• Compatible with upflow and horizontal furnace configurations
• OEM-style replacement for specified Westinghouse furnace models

Compatibility

Designed for use on Westinghouse G7SA, G7SA-1, and G7SD upflow and horizontal furnaces as specified by the manufacturer.

Installation Notes

Installation should be performed by a licensed HVAC technician. Disconnect all electrical power to the furnace at the disconnect switch and confirm power is off before removing or installing the limit switch. Verify the replacement limit switch open and close setpoints match the original component before energizing the system. After installation, cycle the furnace and confirm the limit switch does not trip under normal operating airflow conditions.

Technical Specifications

• Type: Main Air Limit Switch
• Open Temperature: 135 degrees F
• Close Temperature: 165 degrees F
• Application: Upflow and Horizontal Furnace

Standard Information

• Brand: WESTINGHOUSE
• Manufacturer Part Number: 626612R