Reznor 196688 Air Restricter

The Reznor 196688 Air Restricter is a critical combustion air management component engineered specifically for Reznor UDAP and UDAS unit heaters. This primary air restrictor is precision-stamped to regulate the volume of air entering the venter motor assembly, ensuring the stoichiometric ratio remains within factory tolerances. Maintaining the correct combustion air flow is essential for preventing premature heat exchanger fatigue and ensuring stable pilot and burner ignition throughout the heating cycle. As an OEM Reznor replacement part, the 196688 eliminates the guesswork associated with third-party components that often lead to pressure switch tripping or inefficient fuel consumption. For HVAC contractors performing Reznor heater maintenance, verifying the integrity of this restrictor is a standard step in resolving lockout codes related to airflow restricted high-limit switches or improper venting pressures. Trust this genuine part for reliable unit heater repair and long-term diagnostic accuracy.

Key Benefits for Technicians:

• Ensures precise airflow regulation for optimized combustion efficiency in UDAP/UDAS models.
• Direct OEM replacement guarantees exact mounting alignment with existing venter housing.
• Prevents common unit heater lockout issues caused by improper air-to-fuel ratios.
• Constructed from high-grade materials to withstand the thermal stresses of the burner box environment.

Common Technical Questions:

Which Reznor models use the 196688 Air Restricter?
This part is specifically designed for use in the UDAP and UDAS series gas-fired unit heaters. Always check your specific model’s parts list to ensure the orifice size matches your unit’s BTU rating.

How do I tell if the air restrictor needs replacement?
Inspect the restrictor for heavy oxidation, warping, or soot buildup. If the metal has thinned or the aperture is obstructed, it can cause the pressure switch to fail, preventing the heater from firing.

Can I modify the restrictor to increase airflow?
No. The 196688 is calibrated to specific factory standards. Modifying the restrictor will result in improper combustion, potential carbon monoxide production, and will likely trigger safety limit sensors.

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.