The Williams P090554 Orifice is a critical engineering component designed for precise fuel metering in Williams furnace gas conversion and high-altitude applications

this 23mA constant-duty transformer ensures a stable arc for consistent combustion cycles in residential and commercial heating units

for streamlined inventory

Standard protocol dictates replacement during annual maintenance or when a high pressure-differential is detected across the oil filter housing

Siemens DDC R540-110N Control 322838-754 The Williams P090554 Orifice isThe Siemens DDC R540 110N is a high performance Terminal Equipment Controller (TEC) engineered for precise Direct Digital Control of HVAC terminal units, including fan coil units, induction units, and pressure dependent boxes. This refurbished controller is a field proven solution for contractors maintaining Siemens APOGEE or TALON building automation systems. It features six digital outputs and operates on 24VAC 50 60Hz power, providing a robust