Westinghouse 626499R Vent Safety Switch 140F M3 Furnace

Product Description

The WESTINGHOUSE 626499R is a vent safety switch designed to monitor flue gas temperature in residential gas furnace applications. Rated at 140 degrees F and sized for 1/2-inch duct diameter, this switch opens the control circuit when exhaust temperatures exceed the set point, shutting down the burner to prevent overheating and unsafe flue conditions. It is a direct service replacement for M3 home furnace installations. Licensed HVAC technicians install this component as part of routine furnace safety system maintenance or repair.

This vent safety switch is used in residential gas furnace systems where flue gas temperature monitoring is required. It is specifically identified for use on the M3 Home Furnace platform. Typical installation involves mounting the switch on the vent pipe at the appropriate sensing location and wiring it into the low-voltage control circuit. When flue temperatures rise beyond the 140 degrees F threshold, the switch interrupts the control circuit and locks out furnace operation until the condition is corrected.

Key Features

• 140 degrees F set-point rating for accurate overheat detection
• 1/2-inch diameter duct sizing for proper fitment on M3 furnace vent connections
• Opens control circuit on high flue temperature to protect the heat exchanger and venting system
• OEM-style replacement designed for M3 Home Furnace applications
• Supports safe furnace shutdown before hazardous flue conditions can develop

Compatibility

Designed for use on the M3 Home Furnace as an OEM-style vent safety switch replacement.

Installation Notes

Installation should be performed by a licensed HVAC technician in accordance with applicable mechanical codes. Power down the furnace and disconnect the control circuit before removing or installing the switch. Verify the switch is positioned at the correct sensing location on the vent pipe per the furnace service manual. Confirm all low-voltage wiring connections are secure before restoring power and testing furnace operation.

Technical Specifications

• Type: Vent Safety Switch
• Set-Point Temperature: 140 degrees F
• Duct Diameter: 1/2 inch
• Used On: M3 Home Furnace

Standard Information

• Brand: WESTINGHOUSE
• Manufacturer Part Number: 626499R