Lochinvar & A.O. Smith 100111056 Prover Switch

The Lochinvar & A.O. Smith 100111056 Blower Prover Switch is a critical safety component engineered for precise airflow monitoring in high-efficiency commercial gas water heaters. As a direct replacement for the NS2-0544-00 air pressure switch, this assembly ensures the inducer fan effectively clears combustion gases before the ignition sequence initiates. This OEM replacement part is built with a rugged pneumatic diaphragm that converts pressure differentials into electrical signals, preventing hazardous exhaust buildup. Designed specifically for compatibility with A.O. Smith BTH 100-250, SUF, and HCG series models, it provides reliable HVAC pressure sensing in demanding environments. The 100111056 assembly includes the integrated mounting bracket and necessary pneumatic tubing, facilitating a streamlined installation for service technicians. By accurately "proving" blower operation, this commercial water heater switch maintains system efficiency and prevents nuisance lockouts caused by inadequate venting or blocked flue collectors.

• Direct OEM Compatibility: Verified 100111056 replacement for the Cleveland Controls NS2-0544-00, ensuring exact fitment and electrical calibration.
• Enhanced Safety Logic: High-precision differential pressure sensing prevents the gas valve from opening if exhaust flow is restricted or the blower underperforms.
• Comprehensive Kit: Includes the blower prover switch, mounting hardware, and tubing for immediate field replacement.
• Versatile Application: Optimized for use with both natural gas and propane high-efficiency high-recovery commercial units.

• What are the signs of a failing prover switch? Common indicators include the unit failing to spark after the blower starts, or "Air Proving Switch" error codes on the digital controller.
• Will this fix a blocked flue error? While the switch detects the error, technicians should first inspect the pneumatic tubing for condensation or debris and verify the venting is clear of obstructions.
• Is the mounting bracket included? Yes, the 100111056 comes as a complete assembly with the pre-installed bracket for standard bolt-on replacement.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.