Lochinvar & A.O. Smith 100109933 Switch
The Lochinvar & A.O. Smith 100109933 Blocked Inlet Switch is a critical safety component designed for high-efficiency water heaters and boilers. Engineered to monitor atmospheric pressure within the combustion air intake, this OEM replacement pressure switch ensures the burner operates within safe pneumatic parameters. This specific blocked inlet switch kit is calibrated to a set point of -0.77" Water Column, effectively detecting restricted airflow or intake obstructions. Upon sensing an inlet blockage, the switch breaks the 24V control circuit, triggering a safe system shutdown to prevent incomplete combustion, overheating, and potential heat exchanger damage.
For field technicians, the 100109933 switch offers a direct-fit solution for various Lochinvar Knight and A.O. Smith commercial water heater models. The assembly features a robust diaphragm construction and multi-pin plug-in connectors to simplify troubleshooting and reduce labor time during HVAC system maintenance. Professionals should verify the specific WC rating and part number against the appliance data plate, as these safety limits are non-adjustable and unit-specific. Utilizing genuine Lochinvar parts maintains the original equipment’s ETL or UL listing and ensures reliable signal feedback to the integrated Smart System control module.
Key Benefits- Precise Pressure Calibration: Factory-set at -0.77" WC for accurate detection of air intake restrictions in high-efficiency venting systems.
- Enhanced System Safety: Actively monitors the combustion air entrance to prevent hazardous operating conditions caused by debris or external blockages.
- Simplified Installation: Features standard spade or plug-in terminals for quick integration into existing wiring harnesses.
- OEM Reliability: Manufactured to A.O. Smith and Lochinvar strict tolerances, ensuring long-term performance and minimizing nuisance lockouts.
How do I know if the 100109933 switch is faulty?
If your boiler displays a "Blocked Inlet" or "Air Pressure Switch" fault code, check for physical obstructions in the intake pipe. If the intake is clear, use a manometer to verify if the pressure at the switch matches the -0.77" WC rating while the inducer is running. If the pressure is sufficient but the switch remains open, a replacement is necessary.
Is this switch compatible with other vent pressure ratings?
No. This switch is specifically calibrated for systems requiring a -0.77" WC set point. Installing a switch with a different rating can lead to premature failure or unsafe operation of the burner assembly.
Can I bypass this switch for testing?
Temporary bypassing for diagnostic purposes must only be performed by a licensed HVAC technician. The system should never be left operating without a functional safety switch, as it protects against carbon monoxide risks and equipment damage.
This item is not eligible for free shipping.
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.
Lochinvar & A.O. Smith 100109933 Switch
The Lochinvar & A.O. Smith 100109933 Blocked Inlet Switch is a critical safety component designed for high-efficiency water heaters and boilers. Engineered to monitor atmospheric pressure within the combustion air intake, this OEM replacement pressure switch ensures the burner operates within safe pneumatic parameters. This specific blocked inlet switch kit is calibrated to a set point of -0.77" Water Column, effectively detecting restricted airflow or intake obstructions. Upon sensing an inlet blockage, the switch breaks the 24V control circuit, triggering a safe system shutdown to prevent incomplete combustion, overheating, and potential heat exchanger damage.
For field technicians, the 100109933 switch offers a direct-fit solution for various Lochinvar Knight and A.O. Smith commercial water heater models. The assembly features a robust diaphragm construction and multi-pin plug-in connectors to simplify troubleshooting and reduce labor time during HVAC system maintenance. Professionals should verify the specific WC rating and part number against the appliance data plate, as these safety limits are non-adjustable and unit-specific. Utilizing genuine Lochinvar parts maintains the original equipment’s ETL or UL listing and ensures reliable signal feedback to the integrated Smart System control module.
Key Benefits- Precise Pressure Calibration: Factory-set at -0.77" WC for accurate detection of air intake restrictions in high-efficiency venting systems.
- Enhanced System Safety: Actively monitors the combustion air entrance to prevent hazardous operating conditions caused by debris or external blockages.
- Simplified Installation: Features standard spade or plug-in terminals for quick integration into existing wiring harnesses.
- OEM Reliability: Manufactured to A.O. Smith and Lochinvar strict tolerances, ensuring long-term performance and minimizing nuisance lockouts.
How do I know if the 100109933 switch is faulty?
If your boiler displays a "Blocked Inlet" or "Air Pressure Switch" fault code, check for physical obstructions in the intake pipe. If the intake is clear, use a manometer to verify if the pressure at the switch matches the -0.77" WC rating while the inducer is running. If the pressure is sufficient but the switch remains open, a replacement is necessary.
Is this switch compatible with other vent pressure ratings?
No. This switch is specifically calibrated for systems requiring a -0.77" WC set point. Installing a switch with a different rating can lead to premature failure or unsafe operation of the burner assembly.
Can I bypass this switch for testing?
Temporary bypassing for diagnostic purposes must only be performed by a licensed HVAC technician. The system should never be left operating without a functional safety switch, as it protects against carbon monoxide risks and equipment damage.
This item is not eligible for free shipping.
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.
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Description
The Lochinvar & A.O. Smith 100109933 Blocked Inlet Switch is a critical safety component designed for high-efficiency water heaters and boilers. Engineered to monitor atmospheric pressure within the combustion air intake, this OEM replacement pressure switch ensures the burner operates within safe pneumatic parameters. This specific blocked inlet switch kit is calibrated to a set point of -0.77" Water Column, effectively detecting restricted airflow or intake obstructions. Upon sensing an inlet blockage, the switch breaks the 24V control circuit, triggering a safe system shutdown to prevent incomplete combustion, overheating, and potential heat exchanger damage.
For field technicians, the 100109933 switch offers a direct-fit solution for various Lochinvar Knight and A.O. Smith commercial water heater models. The assembly features a robust diaphragm construction and multi-pin plug-in connectors to simplify troubleshooting and reduce labor time during HVAC system maintenance. Professionals should verify the specific WC rating and part number against the appliance data plate, as these safety limits are non-adjustable and unit-specific. Utilizing genuine Lochinvar parts maintains the original equipment’s ETL or UL listing and ensures reliable signal feedback to the integrated Smart System control module.
Key Benefits- Precise Pressure Calibration: Factory-set at -0.77" WC for accurate detection of air intake restrictions in high-efficiency venting systems.
- Enhanced System Safety: Actively monitors the combustion air entrance to prevent hazardous operating conditions caused by debris or external blockages.
- Simplified Installation: Features standard spade or plug-in terminals for quick integration into existing wiring harnesses.
- OEM Reliability: Manufactured to A.O. Smith and Lochinvar strict tolerances, ensuring long-term performance and minimizing nuisance lockouts.
How do I know if the 100109933 switch is faulty?
If your boiler displays a "Blocked Inlet" or "Air Pressure Switch" fault code, check for physical obstructions in the intake pipe. If the intake is clear, use a manometer to verify if the pressure at the switch matches the -0.77" WC rating while the inducer is running. If the pressure is sufficient but the switch remains open, a replacement is necessary.
Is this switch compatible with other vent pressure ratings?
No. This switch is specifically calibrated for systems requiring a -0.77" WC set point. Installing a switch with a different rating can lead to premature failure or unsafe operation of the burner assembly.
Can I bypass this switch for testing?
Temporary bypassing for diagnostic purposes must only be performed by a licensed HVAC technician. The system should never be left operating without a functional safety switch, as it protects against carbon monoxide risks and equipment damage.
This item is not eligible for free shipping.
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.
