A larger opening increases the venting speed for radiators further from the boiler

Check for carbon buildup on the pilot burner or ensure the pilot flame is fully engulfing the top 1/2 to 2/3 of the thermopile tip

Always verify the physical length (18-1/2") and terminal type against your existing cell before installation

ensuring reliable current sensing relay performance in both commercial and industrial retrofit applications

White-Rodgers 1609-90 Control Els PW 17895 A larger opening increases theThe White Rodgers 1609 90 is a heavy duty hydraulic action refrigeration temperature control designed specifically for demanding commercial and industrial applications. This mechanical control is built for zoning systems where multiple controllers manage a common compressor via separate solenoid refrigerant valves in each zone. Engineered with a two circuit hook up (SPST), the 1609 90 provides a close on rise switch action to ensure positive system