Westinghouse 626613R Furnace Limit Switch Upflow Horizontal

Product Description

The WESTINGHOUSE 626613R is a main air limit switch designed for upflow and horizontal gas furnace applications. This thermal safety device monitors supply-air temperature inside the heat exchanger plenum and opens the control circuit when air temperature exceeds the rated trip point, shutting down the burner to prevent overheating. It resets automatically once temperatures drop to the close setpoint. Licensed HVAC technicians install this switch as a direct OEM-style replacement during routine safety inspections or when a failed limit is confirmed through diagnostic testing.

This limit switch is specified for use in upflow and horizontal furnace configurations. It is a main air limit, meaning it monitors the primary supply-air stream rather than a secondary or rollout zone. The open setpoint of 140 degrees F and close setpoint of 170 degrees F make it appropriate for furnaces where the OEM calls for this specific thermal range. Installation is straightforward for technicians familiar with low-voltage control circuits and gas appliance service procedures.

Key Features

• Main air limit function monitors supply-air temperature to protect the heat exchanger and blower system
• Opens at 140 degrees F and closes at 170 degrees F for precise thermal control
• Designed for upflow and horizontal furnace orientations
• OEM-style replacement for WESTINGHOUSE G7SA, G7SA-1, and G7SD furnace models
• Automatic reset operation restores normal furnace function once temperatures normalize

Compatibility

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

Installation Notes

A licensed HVAC technician should perform limit switch replacement. Shut off power to the furnace at the disconnect or breaker and close the manual gas valve before beginning work. Confirm the new switch open and close setpoints match the values listed on the furnace wiring diagram before installation. Follow all applicable local mechanical codes and the furnace manufacturer service instructions when replacing safety limit devices.

Technical Specifications

• Type: Main Air Limit Switch
• Open Setpoint: 140 degrees F
• Close Setpoint: 170 degrees F
• Furnace Orientation: Upflow and Horizontal

Standard Information

• Brand: WESTINGHOUSE
• Manufacturer Part Number: 626613R