Reznor 123665 Burner 321142-301 this expansion valve is designed

this expansion valve is designed to handle the higher operating pressures and specific oil requirements of R-410A refrigerant circuits used in modern Bard units

you know that maintaining precise combustion airflow is critical for the Ultra 155 gas boiler to operate at peak efficiency and avoid lockout codes

the internal spring return pushes the stem up to keep the valve in the fully open position

preventing automatic restarts after a safety trip until a technician inspects the system

and a 1" x 2" crocus cloth to ensure professional-grade stem preparation

Reznor 123665 Burner 321142-301 this expansion valve is designedThe Reznor 123665 Burner is a precision engineered replacement component designed for compatibility with specific Reznor gas fired unit heaters and duct furnaces. As a critical part of the combustion assembly, this natural gas burner ensures optimal fuel to air ratios and consistent flame stability across high output heating cycles. Built to OEM specifications, the 123665 provides a direct fit solution for maintaining thermal efficiency in commercial