McDonnell & Miller 159S Controller Freon and UVO3-523 ozone-generating air treatment

and UVO3-523 ozone-generating air treatment systems

then turn clockwise five full rotations to engage the spring

this normally closed model includes a manual operating lever to bypass the motor for system filling or emergency operation

the 6-inch paddle provides the necessary surface area for low-flow sensitivity

making it an ideal choice for boiler feedwater systems

McDonnell & Miller 159S Controller Freon and UVO3-523 ozone-generating air treatmentThe McDonnell & Miller 159S Controller (Part Number 178802) is a specialized combination low water cut off and pump controller designed for heavy duty commercial and industrial steam boiler applications. Operating at a maximum pressure of 150 psi, this unit integrates a float operated mechanism with dual bi metal snap acting switches to ensure precise level management. The configuration features one SPST switch dedicated to pump control and a second