Description
The Xylem-McDonnell & Miller 51SHD Replacement Head Assembly 51S 135800 is used to provide control back to float-effective low water cutoff system applications in steam, and hot water boilers. The assembly contains the switch that responds to the float’s movement either turning electrical contacts on or off based on the water levels in HVAC systems. It has been used in boiler safety circuits to aid appropriate reactions, to low water conditions by indicating shutdown or control measures. Its operation ensures a protection system accurate level sensing, and the proper operation of boiler control assemblies in heating systems.
