McDonnell & Miller Head Mechanism, Snap Switch, 150S-HD, 150 psi, 150S Series

McDonnell & Miller 150S-HD Head Mechanism with a Snap Switch plays a crucial role in the 150S series of low water cut-off controls designed to safeguard boilers and hydronic heating setups.

The 150S-HD mechanism operates using snap-action and float switches, which enable rapid and accurate switching actions. As the water levels fluctuate, the float either ascends or descends, leading to the triggering or halting of the boiler pump. It activates alarms if the water level drops too low. This crucial component ensures the system operates safely and efficiently, preventing damages caused by overheating or pump malfunctions.

Rated for a maximum pressure of 150 psi (pounds per square inch), the 150S-HD is suitable for most residential and light commercial boiler applications. 

The 150S-HD is equipped with Monel bellows for corrosion resistance. This nickel-copper alloy is famed for its strength and resistance to corrosion, making it perfect for use in tough environments like boilers. It is designed for simple installation and integration into existing systems including steam generators and industrial process tanks.