Lochinvar & A.O. Smith 100277772 Pressure Switch
The Lochinvar & A.O. Smith 100277772 Pressure Switch is a critical safety component engineered for high-altitude applications in Crest FBN and FBL heating boilers. This F9 high-altitude air pressure switch is factory-calibrated with a 4.1 in-WC set point to monitor combustion chamber pressure accurately in thinned atmospheres. It serves as a proving switch, ensuring the combustion air blower provides sufficient flow for a clean, safe burn before the ignition cycle initiates. Built to OEM specifications, this 100277772 replacement part eliminates the risk of nuisance lockouts and APS Open error codes common with substandard or miscalibrated switches. For experienced technicians, this switch is the definitive solution for restoring system reliability in FBN0751, FBN1001, and FBN1251 models installed at elevations where standard pressure parameters fail. Ensure all reference tubing is clear of moisture or debris and check vent length compliance during installation to maintain peak efficiency.
Key Benefits:- Specifically designed for high-altitude boiler performance to prevent "Air Pressure SW" faults.
- OEM 4.1 in-WC rating ensures precise calibration for Crest heating systems.
- Rugged construction maintains safety circuit integrity and consistent proving signals.
- Directly compatible with Lochinvar FBN(L) 751-2001 series commercial boilers.
- Facilitates optimal combustion efficiency by accurately monitoring inducer fan output.
- How do I fix a Lochinvar "APS Open" error code? First, check the reference hoses for blockages or kinks. If the blower is running at full speed but the switch contacts remain open, replacing it with the 100277772 high-altitude switch is often necessary.
- Will this work for standard altitude installations? This specific model is calibrated for increased elevation. Consult the boiler service manual to ensure the 4.1 in-WC set point matches your specific site requirements for the F9 air pressure switch.
- Can I swap this with a different pressure rating? No. Using a switch with an incorrect set point can lead to hazardous combustion or frequent boiler lockouts. Always use genuine A.O. Smith parts with the correct technical specifications.
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.
Original: $147.45
-65%$147.45
$51.61Lochinvar & A.O. Smith 100277772 Pressure Switch
The Lochinvar & A.O. Smith 100277772 Pressure Switch is a critical safety component engineered for high-altitude applications in Crest FBN and FBL heating boilers. This F9 high-altitude air pressure switch is factory-calibrated with a 4.1 in-WC set point to monitor combustion chamber pressure accurately in thinned atmospheres. It serves as a proving switch, ensuring the combustion air blower provides sufficient flow for a clean, safe burn before the ignition cycle initiates. Built to OEM specifications, this 100277772 replacement part eliminates the risk of nuisance lockouts and APS Open error codes common with substandard or miscalibrated switches. For experienced technicians, this switch is the definitive solution for restoring system reliability in FBN0751, FBN1001, and FBN1251 models installed at elevations where standard pressure parameters fail. Ensure all reference tubing is clear of moisture or debris and check vent length compliance during installation to maintain peak efficiency.
Key Benefits:- Specifically designed for high-altitude boiler performance to prevent "Air Pressure SW" faults.
- OEM 4.1 in-WC rating ensures precise calibration for Crest heating systems.
- Rugged construction maintains safety circuit integrity and consistent proving signals.
- Directly compatible with Lochinvar FBN(L) 751-2001 series commercial boilers.
- Facilitates optimal combustion efficiency by accurately monitoring inducer fan output.
- How do I fix a Lochinvar "APS Open" error code? First, check the reference hoses for blockages or kinks. If the blower is running at full speed but the switch contacts remain open, replacing it with the 100277772 high-altitude switch is often necessary.
- Will this work for standard altitude installations? This specific model is calibrated for increased elevation. Consult the boiler service manual to ensure the 4.1 in-WC set point matches your specific site requirements for the F9 air pressure switch.
- Can I swap this with a different pressure rating? No. Using a switch with an incorrect set point can lead to hazardous combustion or frequent boiler lockouts. Always use genuine A.O. Smith parts with the correct technical specifications.
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 100277772 Pressure Switch is a critical safety component engineered for high-altitude applications in Crest FBN and FBL heating boilers. This F9 high-altitude air pressure switch is factory-calibrated with a 4.1 in-WC set point to monitor combustion chamber pressure accurately in thinned atmospheres. It serves as a proving switch, ensuring the combustion air blower provides sufficient flow for a clean, safe burn before the ignition cycle initiates. Built to OEM specifications, this 100277772 replacement part eliminates the risk of nuisance lockouts and APS Open error codes common with substandard or miscalibrated switches. For experienced technicians, this switch is the definitive solution for restoring system reliability in FBN0751, FBN1001, and FBN1251 models installed at elevations where standard pressure parameters fail. Ensure all reference tubing is clear of moisture or debris and check vent length compliance during installation to maintain peak efficiency.
Key Benefits:- Specifically designed for high-altitude boiler performance to prevent "Air Pressure SW" faults.
- OEM 4.1 in-WC rating ensures precise calibration for Crest heating systems.
- Rugged construction maintains safety circuit integrity and consistent proving signals.
- Directly compatible with Lochinvar FBN(L) 751-2001 series commercial boilers.
- Facilitates optimal combustion efficiency by accurately monitoring inducer fan output.
- How do I fix a Lochinvar "APS Open" error code? First, check the reference hoses for blockages or kinks. If the blower is running at full speed but the switch contacts remain open, replacing it with the 100277772 high-altitude switch is often necessary.
- Will this work for standard altitude installations? This specific model is calibrated for increased elevation. Consult the boiler service manual to ensure the 4.1 in-WC set point matches your specific site requirements for the F9 air pressure switch.
- Can I swap this with a different pressure rating? No. Using a switch with an incorrect set point can lead to hazardous combustion or frequent boiler lockouts. Always use genuine A.O. Smith parts with the correct technical specifications.
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.
