Lochinvar & A.O. Smith 100110736 Pressure Switch

The Lochinvar and A.O. Smith 100110736 Pressure Switch is a critical safety component designed for precise differential pressure monitoring in commercial water heaters and boilers. This blocked outlet switch is calibrated to detect internal venting obstructions, ensuring the combustion blower maintains sufficient airflow before allowing the ignition sequence to proceed. Engineered for high-cycle reliability, the 100110736 prevents hazardous operation by opening the electrical circuit if the static pressure exceeds or falls below the factory-defined setpoint. When troubleshooting Lochinvar error codes related to pressure failures, this OEM replacement ensures exact compatibility with SNA, SNR, and BNR series units. Proper installation requires verifying the tubing connections are secure and clear of condensation to prevent nuisance tripping. For technicians performing OEM HVAC parts replacement, this switch provides the industrial-grade durability necessary for maintaining system uptime in demanding hydronic applications.

Key Benefits

• OEM Compatibility: Exact replacement for Lochinvar and A.O. Smith part numbers 100110736 and 9006282005.
• Enhanced Safety: Acts as a primary blocked vent safety switch to prevent carbon monoxide buildup and improper combustion.
• Precise Calibration: Factory-set to specific WC (Water Column) parameters for accurate airflow detection.
• Durable Construction: Built to withstand high-temperature environments typical of commercial mechanical rooms.

Common Questions

Is the 100110736 switch compatible with both natural gas and propane units?
Yes, this pressure switch monitors airflow and venting conditions, making it independent of the fuel type used by the boiler or water heater.

What causes a pressure switch stuck open error?
Common causes include a failing blower motor, obstructed vent piping, or cracked silicone tubing. If the venting is clear, the 100110736 pressure switch may have a fatigued internal diaphragm.

How do I test this switch during a service call?
A technician should use a manometer to verify the actual pressure against the switch's setpoint and a multimeter to check for continuity across the terminals when the blower is engaged.

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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.