Lochinvar & A.O. Smith 100145023 Combustion Air Fan

As a veteran tech, you know that keeping a high-BTU boiler running efficiently depends entirely on the air-fuel ratio. The Lochinvar & A.O. Smith 100145023 Combustion Air Fan is a critical replacement component for Power-Fin PB and PF series boilers and water heaters. Specifically engineered for 501 through 1300/1302 models, this 115V blower assembly provides the precise static pressure required to overcome heat exchanger resistance and ensure clean combustion. Whether you are dealing with a PF 502 or a large-scale PB 1002, this fan regulates the oxygen supply to prevent soot buildup and nuisance flame failures. This unit is the direct OEM replacement for the discontinued FAN3727, featuring a robust housing and motor balanced to minimize vibrational stress on the gas train. When installing this OEM combustion blower, always verify your gaskets and use a combustion analyzer to confirm the CO2 levels are within the manufacturer's specified range for these gas-fired heating systems.

• Direct OEM Compatibility: Specifically designed to replace Lochinvar FAN3727 and 100145023 without the need for mounting bracket modifications.
• High-Output Performance: Optimized for the Power-Fin boiler series (501-1302) to maintain consistent airflow under shifting thermal loads.
• Enhanced System Reliability: High-grade motor bearings and balanced impellers reduce mechanical noise and extend the service life of the blower assembly.
• Efficient Air Delivery: Maintains the critical air-to-gas mixture required for high-efficiency combustion, lowering emissions and preventing burner fouling.

Is the 100145023 compatible with older Power-Fin models?
Yes, this fan is the current standard for Power-Fin PB 501-1300 and PF 501-1300 units. It is identical in form and function to the legacy FAN3727 part number.

Does this fan include the mounting gaskets?
Standard replacement kits typically focus on the blower assembly. It is a best practice for contractors to inspect and replace the combustion air fan gaskets during installation to prevent air leaks that cause erratic flame signals.

What are the symptoms of a failing combustion air fan?
Technicians should look for Lochinvar error codes related to "Fan Speed Low" or "Air Pressure Switch" faults, as well as excessive grinding noises which indicate bearing failure within the motor.

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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.