Westinghouse 626422R Rollout Limit Switch Gas Furnace

Product Description

The WESTINGHOUSE 626422R is a rollout limit switch designed for gas furnace applications. This safety control device monitors burner flame rollout conditions and interrupts furnace operation when abnormal heat is detected outside the combustion chamber. Measuring 3/4 inch in diameter, it is rated to trip at 155 degrees F and reset at 110 degrees F. Licensed HVAC technicians install this switch as part of routine furnace safety maintenance or when diagnosing nuisance rollout trips caused by blocked heat exchangers, restricted flue passages, or failed ignition sequences.

This rollout limit switch is suited for residential gas furnace installations where burner compartment overheat protection is required. It mounts directly in the burner area to sense radiant and convective heat from burner flame rollout events. When a rollout condition occurs, the switch opens the control circuit, shutting down the burner to prevent heat damage or a fire hazard. It is a common replacement component during furnace safety inspections and service calls involving repeated limit lockouts.

Key Features

• Rollout protection interrupts furnace operation on detection of abnormal burner flame activity
• Trip temperature of 155 degrees F with reset at 110 degrees F provides defined safety threshold
• 3/4 inch diameter body allows fitment in standard rollout limit mounting locations
• Direct replacement design simplifies swapping on existing gas furnace control circuits
• Manual or automatic reset function as designed protects against repeated unsafe restarts

Compatibility

Designed as an OEM-style replacement rollout limit switch for residential gas furnace systems requiring a 3/4 inch diameter limit switch rated at 110/155 degrees F.

Installation Notes

Installation should be performed by a licensed HVAC technician in accordance with local mechanical codes and the furnace manufacturer's service documentation. Shut off all electrical power to the furnace and close the gas supply valve before removing the existing switch or handling wiring. Verify the replacement switch trip temperature matches the original specification before installing. After installation, restore power and cycle the furnace to confirm normal burner operation and proper limit function before leaving the job site.

Technical Specifications

• Type: Rollout Limit Switch
• Application: Gas Furnace
• Body Diameter: 0.75 inches
• Reset Temperature: 110 degrees F
• Trip Temperature: 155 degrees F

Standard Information

• Brand: WESTINGHOUSE
• Manufacturer Part Number: 626422R