Lochinvar & A.O. Smith 100227399 Pressure Switch
The Lochinvar & A.O. Smith 100227399 Pressure Switch is a critical safety component engineered for precise combustion air pressure sensing in high-efficiency boilers and water heaters. As a normally closed (N.C.) pressure switch factory-set to 2.12" WC (Water Column), this OEM replacement part ensures the inducer motor is moving sufficient air for safe ignition and sustained burner operation. When troubleshooting a pressure switch stuck closed or open error code on a Lochinvar Knight or A.O. Smith Cyclone, installing a genuine 100227399 air pressure switch is essential to restore the safety proving circuit. This rugged mechanical switch is designed to withstand the heat and moisture profiles found in modern condensing appliances, providing reliable differential pressure monitoring without the drift common in aftermarket universal alternatives.
Technical Benefits for Professionals
- Precision Calibration: Fixed 2.12 inch Water Column set point ensures strict compliance with manufacturer furnace and boiler safety sequences.
- OEM Compatibility: Direct drop-in replacement for 100227399, compatible with a wide range of Lochinvar, A.O. Smith, State, and Reliance commercial and residential units.
- Integrated Safety: Features a Normally Closed (N.C.) contact configuration to prevent ignition if gas venting or air intake is compromised.
- Durable Construction: Built with high-grade diaphragms to resist corrosion in condensing HVAC environments and ensure long-term cycle reliability.
- Straightforward Installation: Standard terminal connections and mounting footprints reduce labor time during HVAC emergency repairs.
Common Technical Questions
How do I verify if the 100227399 switch is failing?
Use a calibrated manometer to measure the actual vacuum or pressure at the switch ports while the inducer is running. If the pressure reading exceeds 2.12" WC but the electrical contacts do not change state, the internal diaphragm or microswitch has likely failed.
Can I use an adjustable pressure switch to replace this part?
Technicians should avoid adjustable switches for this application. The Lochinvar 100227399 is factory-calibrated to a specific safety limit; using a switch with the wrong set point can lead to incomplete combustion or dangerous carbon monoxide levels.
What causes this pressure switch to trip frequently?
Frequent tripping is often caused by a restricted flue vent, a blocked condensate drain, or debris in the vacuum tubing. Always inspect the assembly for cracks or moisture before replacing the switch itself.
Safety Notice:
This product contains materials known to the State of California to cause cancer and reproductive harm. (California Proposition 65 Warning)
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.
Original: $41.89
-65%$41.89
$14.66Lochinvar & A.O. Smith 100227399 Pressure Switch
The Lochinvar & A.O. Smith 100227399 Pressure Switch is a critical safety component engineered for precise combustion air pressure sensing in high-efficiency boilers and water heaters. As a normally closed (N.C.) pressure switch factory-set to 2.12" WC (Water Column), this OEM replacement part ensures the inducer motor is moving sufficient air for safe ignition and sustained burner operation. When troubleshooting a pressure switch stuck closed or open error code on a Lochinvar Knight or A.O. Smith Cyclone, installing a genuine 100227399 air pressure switch is essential to restore the safety proving circuit. This rugged mechanical switch is designed to withstand the heat and moisture profiles found in modern condensing appliances, providing reliable differential pressure monitoring without the drift common in aftermarket universal alternatives.
Technical Benefits for Professionals
- Precision Calibration: Fixed 2.12 inch Water Column set point ensures strict compliance with manufacturer furnace and boiler safety sequences.
- OEM Compatibility: Direct drop-in replacement for 100227399, compatible with a wide range of Lochinvar, A.O. Smith, State, and Reliance commercial and residential units.
- Integrated Safety: Features a Normally Closed (N.C.) contact configuration to prevent ignition if gas venting or air intake is compromised.
- Durable Construction: Built with high-grade diaphragms to resist corrosion in condensing HVAC environments and ensure long-term cycle reliability.
- Straightforward Installation: Standard terminal connections and mounting footprints reduce labor time during HVAC emergency repairs.
Common Technical Questions
How do I verify if the 100227399 switch is failing?
Use a calibrated manometer to measure the actual vacuum or pressure at the switch ports while the inducer is running. If the pressure reading exceeds 2.12" WC but the electrical contacts do not change state, the internal diaphragm or microswitch has likely failed.
Can I use an adjustable pressure switch to replace this part?
Technicians should avoid adjustable switches for this application. The Lochinvar 100227399 is factory-calibrated to a specific safety limit; using a switch with the wrong set point can lead to incomplete combustion or dangerous carbon monoxide levels.
What causes this pressure switch to trip frequently?
Frequent tripping is often caused by a restricted flue vent, a blocked condensate drain, or debris in the vacuum tubing. Always inspect the assembly for cracks or moisture before replacing the switch itself.
Safety Notice:
This product contains materials known to the State of California to cause cancer and reproductive harm. (California Proposition 65 Warning)
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.
Product Information
Product Information
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Description
The Lochinvar & A.O. Smith 100227399 Pressure Switch is a critical safety component engineered for precise combustion air pressure sensing in high-efficiency boilers and water heaters. As a normally closed (N.C.) pressure switch factory-set to 2.12" WC (Water Column), this OEM replacement part ensures the inducer motor is moving sufficient air for safe ignition and sustained burner operation. When troubleshooting a pressure switch stuck closed or open error code on a Lochinvar Knight or A.O. Smith Cyclone, installing a genuine 100227399 air pressure switch is essential to restore the safety proving circuit. This rugged mechanical switch is designed to withstand the heat and moisture profiles found in modern condensing appliances, providing reliable differential pressure monitoring without the drift common in aftermarket universal alternatives.
Technical Benefits for Professionals
- Precision Calibration: Fixed 2.12 inch Water Column set point ensures strict compliance with manufacturer furnace and boiler safety sequences.
- OEM Compatibility: Direct drop-in replacement for 100227399, compatible with a wide range of Lochinvar, A.O. Smith, State, and Reliance commercial and residential units.
- Integrated Safety: Features a Normally Closed (N.C.) contact configuration to prevent ignition if gas venting or air intake is compromised.
- Durable Construction: Built with high-grade diaphragms to resist corrosion in condensing HVAC environments and ensure long-term cycle reliability.
- Straightforward Installation: Standard terminal connections and mounting footprints reduce labor time during HVAC emergency repairs.
Common Technical Questions
How do I verify if the 100227399 switch is failing?
Use a calibrated manometer to measure the actual vacuum or pressure at the switch ports while the inducer is running. If the pressure reading exceeds 2.12" WC but the electrical contacts do not change state, the internal diaphragm or microswitch has likely failed.
Can I use an adjustable pressure switch to replace this part?
Technicians should avoid adjustable switches for this application. The Lochinvar 100227399 is factory-calibrated to a specific safety limit; using a switch with the wrong set point can lead to incomplete combustion or dangerous carbon monoxide levels.
What causes this pressure switch to trip frequently?
Frequent tripping is often caused by a restricted flue vent, a blocked condensate drain, or debris in the vacuum tubing. Always inspect the assembly for cracks or moisture before replacing the switch itself.
Safety Notice:
This product contains materials known to the State of California to cause cancer and reproductive harm. (California Proposition 65 Warning)
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.
