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

centered grip on both round and square damper shafts within the specified size range

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

Automatic Reset Logic: Eliminates manual intervention by restoring the electrical circuit once the gas pressure recovers to safe operating levels

You can verify this by checking the label on your existing part or using a digital manometer to measure the actual draft pressure during the startup sequence

McDonnell & Miller 194-A-7B Controller R-22 Optimized Performance: Fixed 1050 RPMThe 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