The Maxitrol M520R-3/4 is a precision-engineered NPT modulating gas valve designed for integration with Series 94 and A200 Selectra electronic gas flame modulation systems

specifically the BTH

Optimized Combustion: The 14615532 burner tube design assists in maintaining a clean blue flame

the McDonnell & Miller FS-1 Liquid Flow Switch (Part Number 113200) is the industry standard for high sensitivity flow sensing

Once a gasket is compressed under high pressure

Siemens Combustion RWF50.20A9 Controller 320734-701 The Maxitrol M520R-3/4 is aThe Siemens RWF50. 20A9 is a high performance universal digital controller engineered for precision monitoring of temperature and pressure in modulating burner systems. This PID controller features a robust 3 position output, making it an essential component for oil or gas fired heating plants requiring tight process variable control. Designed for control panel mounting, the unit accepts a wide range of analytical inputsincluding Pt100 resistance