Lochinvar & A.O. Smith 100277835 Kit

The Lochinvar & A.O. Smith 100277835 Kit is a critical Venturi High Modulation assembly designed for precision air-to-fuel ratio control in high-efficiency condensing boilers and water heaters. Engineered for natural gas systems, this 24 mm venturi ensures consistent performance across the full turndown range, or 5:1 firing rate, by precisely mixing gas and air before delivery to the radial fire burner. This OEM replacement part is essential for maintaining the 85% thermal efficiency and low NOx operation characteristic of the Power-Fin and Genesis series. The kit includes the necessary gasket to ensure a pressurized, airtight seal during installation. Technicians should note that this 100277835 gas assembly requires careful calibration with a combustion analyzer to verify CO2 and O2 levels under high and low fire conditions. Utilizing this genuine Lochinvar venturi kit prevents common ignition failures and ensures the modulating burner responds accurately to the smart-touch electronic control signals.

• Precise Modulation: Supports a 5:1 turndown ratio for consistent 85% thermal efficiency.
• OEM Compatibility: Specifically designed for Lochinvar and A.O. Smith high-efficiency commercial equipment.
• Complete Assembly: Includes the 24 mm venturi and required gasket for a secure, leak-proof seal.
• Optimized Combustion: Improves air-fuel mixing to reduce carbon buildup and ensure low NOx performance.
• Direct Fit: Replaces SKU 100277835 and 100287143 ensuring exact mechanical alignment with the blower assembly.

Is the 100277835 kit compatible with LP gas systems?
No, this specific venturi is calibrated for natural gas. For propane applications, a dedicated conversion kit must be used to ensure correct orifice sizing and safety.

What are the signs of a failing venturi?
Common indicators include inconsistent flame signals, "rumbling" during high-fire modulation, or difficulty maintaining stable combustion across the firing range.

Does this kit include the blower assembly?
No, this is the venturi kit only. It mounts directly to the blower flange to control the intake mixture; the blower itself is sold separately.

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.