Lochinvar & A.O. Smith 100110013 Pressure Switch

The Lochinvar and A.O. Smith 100110013 Pressure Switch is a critical safety component designed for precise combustion air monitoring in high-efficiency water heaters and boilers. This differential air pressure switch is calibrated to detect proper draft conditions, ensuring the blower motor is moving sufficient air before allowing the ignition sequence to proceed. Engineered as a direct OEM replacement part, the 100110013 replaces legacy part numbers 9004416005 and PS4607730. This switch features a high-sensitivity diaphragm and robust electrical contacts to handle the cycling demands of commercial and residential heating systems. When troubleshooting ignition failure codes or blocked flue sensors, verifying the set point of this combustion air pressure switch is essential for maintaining operational safety and equipment longevity. Its design ensures compatibility with specific Lochinvar Knight and A.O. Smith Cyclone models where precise pressure differentials are required for venting validation.

Key Benefits for Technicians:

• Exact OEM Calibration: Pre-set tolerance levels ensure the 100110013 switch integrates seamlessly with the factory control board logic without field adjustment.
• System Safety Integrity: Prevents the burner from firing under venting obstruction or mechanical blower failure, protecting the heat exchanger from soot and overheating.
• Simplified Troubleshooting: Durable housing and standard terminal connections allow for fast continuity testing and pressure verification during service calls.
• Broad Compatibility: Functions as the primary vent pressure switch for a wide range of high-efficiency condensation units from both A.O. Smith and Lochinvar.

Common Questions & Technical Support:

What causes a pressure switch stuck open error?
This typically indicates a blockage in the venting system, a pinched silicone pressure tube, or a failing blower motor that cannot reach the required RPM to close the switch contacts.

Can I use a universal pressure switch instead of the 100110013?
Using a universal air switch is not recommended. This OEM pressure switch has a specific factory set point measured in inches of water column (WC); an incorrect rating can lead to hazardous combustion conditions or frequent nuisance lockouts.

How do I verify if the switch is defective?
Use a manometer to measure the actual draft pressure and a multimeter to check for electrical continuity across the terminals when the pressure set point is reached. Replace the switch if it fails to close despite sufficient pressure.

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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.