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the McDonnell & Miller 312200 is the official updated part number that replaces the discontinued 311100
If your current system uses a single screw-in coaxial connection at the valve
this unit ensures an exact proportional relationship between detected temperatures and your controller
making it ideal for high-reliability environments where electronic components might fail
ensuring reliable heat pump fan blade performance throughout the cooling season
McDonnell & Miller 193-A-1 Replacement Casting 30067439-890 the McDonnell & Miller 312200The McDonnell & Miller 193 A 1 Replacement Casting is a primary structural component engineered specifically for the Series 193 low water cut off and pump controller. As a veteran technician knows, the integrity of the water column casting is vital for maintaining the 150 psi (10. 5 kg cm2) maximum pressure rating required by commercial and industrial steam boilers. This replacement boiler casting features precise 1" NPT connections for the main