this specific part number typically includes a removable bypass plug that can be swapped for a provided orifice for continuous minimum flow

increased amp draw on the blower motor

Optimized Performance: Fixed 1050 RPM speed rated for precise airflow across high-efficiency heat exchangers

the start point is field-adjustable from 2 to 12 Vdc (factory-set at 6 Vdc)

Precision Fit: Designed for seamless integration with Spirax Sarco B Series covers

McDonnell & Miller 194-A-7B Controller R-22 this specific part number typicallyThe McDonnell & Miller 194 A 7B (Part Number 167100) is a heavy duty combination low water cut off and pump controller engineered for commercial and industrial steam boiler applications. Designed to handle a maximum pressure of 250 PSI, this unit integrates a high performance potentiometer switch to provide a proportional 135 ohm signal, ensuring a constant water level is maintained regardless of varying steaming rates. As a veteran grade float