allowing technicians to manually position valves or preload the spring during commissioning or emergency service

Which HVAC models are compatible with this module

System Compatibility: Engineered as a direct 61-20649-04 replacement for specific Rheem and Ruud hydronic and refrigeration units

As the direct OEM replacement for part number B1360719

Direct Update: Optimized design replaces the older CBK2PD240VA060S with identical mounting footprints

McDonnell & Miller 51-S-2 Switch 30067439-890 allowing technicians to manually positionThe McDonnell & Miller 51 S 2 is a heavy duty mechanical water feeder and low water cut off (LWCO) designed for low pressure steam and hot water boilers. Engineered for systems with a maximum vessel pressure of 35 psi, this unit features a snap acting SPDT switch that ensures positive electrical contact for burner control or alarm signaling. The 1" NPT connections allow for straightforward integration into existing boiler piping, providing a reliable