McDonnell & Miller 51-S-HD Water Feeder Refrigerant providing a critical fail-safe position

providing a critical fail-safe position for specific system requirements

Key Benefits Precise Thermal Protection: Features a fixed L170-30F high limit to shut down burners before the heat exchanger reaches critical temperatures

this cable is the specified match for sizes 6-12 and 13-23

Can this be used on AM or NM series actuators

leaking fluid

McDonnell & Miller 51-S-HD Water Feeder Refrigerant providing a critical fail-safe positionThe 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