Burnham 105849-01 Air Proving Switch for K2 Series Boilers

The Burnham 105849-01 is an OEM air proving switch designed specifically for K2 080-120 series boilers. This critical safety component monitors air pressure to ensure proper airflow and ventilation before allowing the boiler to fire, protecting your heating system from dangerous operating conditions.

Key Features:

• OEM replacement part for Burnham K2 series boilers (models K2FT085 through K2 080-120)
• Pressure rating: 1.05" WC (water column)
• Ensures proper combustion air flow during burner operation
• Verifies adequate airflow during pre-purge cycle to clear combustion chamber
• Prevents ignition if airflow is insufficient, protecting against incomplete combustion
• Helps maintain proper fuel-to-air mixture for efficient operation

How It Works:

The air proving switch monitors differential air pressure within the boiler system. During the pre-purge cycle and normal operation, the combustion air fan creates pressure that activates the switch. Once the switch confirms adequate airflow, it signals the control board to proceed with ignition. If pressure drops below the set point due to a blocked flue, faulty fan, or other airflow issues, the switch prevents burner operation to maintain safe conditions.

This genuine Burnham replacement part ensures reliable performance and proper integration with your K2 series boiler's safety control system. Regular inspection and replacement of air proving switches is essential for maintaining boiler safety and efficiency.