McDonnell & Miller 51-S-HD Water Feeder Els PW 17895 effectively replacing outdated mod motors

effectively replacing outdated mod motors and butterfly valves

What are the wiring requirements for this potentiometer

Does this valve come with the orifice included

This kit is a direct 1:1 replacement for the 391936/U and is compatible with an extensive range of Resideo and Honeywell Home hardware

Can I operate the valve manually if the 24V power supply fails

McDonnell & Miller 51-S-HD Water Feeder Els PW 17895 effectively replacing outdated mod motorsThe McDonnell & Miller 51 S HD (Part Number 135800) is a heavy duty head mechanism only replacement designed specifically for Series 51 S mechanical water feeders. Engineered for high capacity systems up to 35,000 sq. ft., this unit is critical for maintaining precise water levels in low pressure steam and hot water boilers. Proportional feed action ensures a steady response to boiler demand, preventing the rapid cycling that stresses high volume