Allied Air 52M72 Furnace Flame Sensor

Product Description

The ALLIED AIR 52M72 is a flame sensor designed for use in gas furnaces. The flame sensor monitors the burner flame during operation by detecting the small electrical current that a flame conducts between the sensor rod and the burner ground. If no flame is detected after ignition, the control board shuts off the gas valve to prevent unburned gas accumulation. This part is installed by licensed HVAC technicians during routine maintenance or as a replacement when a furnace is locking out on no-ignition faults caused by a fouled or failed sensor rod.

The 52M72 is suited for residential gas furnace applications. Flame sensor replacement is one of the most common service calls on older furnaces, typically when the sensor rod has accumulated an oxide coating that reduces conductivity. This part is referenced against the SG10B furnace application per supplier documentation, making it a direct-fit option in that product line.

Key Features

• Detects burner flame via flame rectification signal to prevent unburned gas discharge
• Direct replacement for failed or fouled OEM flame sensor rods
• Lightweight construction at 0.2 pounds for easy handling during installation
• Compatible with residential gas furnace control systems

Compatibility

Referenced for use on the SG10B furnace per supplier documentation. Verify fitment against your specific unit model and control board before installation.

Installation Notes

Flame sensor replacement is performed by a licensed HVAC technician. Before servicing, shut off power to the furnace at the disconnect switch and turn the gas supply to the OFF position. The sensor rod is typically secured with a single screw and connects via a single wire lead — handle the rod carefully to avoid contaminating the sensing element with skin oils. Follow all applicable local mechanical codes and manufacturer service documentation when reinstalling.

Technical Specifications

• Type: Flame Sensor
• Application: Furnace
• Weight: 0.2 pounds

Standard Information

• Brand: ALLIED AIR
• Manufacturer Part Number: 52M72