McDonnell & Miller 157S-P Controller R-407A many R-410A high-side requirements exceed

many R-410A high-side requirements exceed this range

This microprocessor-based control manages the ignition sequence

Veteran technicians recognize this HVAC heater assembly for its exact fitment

As a primary sensing element for conductivity liquid level controls

Heat-cycled fasteners often suffer from thread fatigue or corrosion

McDonnell & Miller 157S-P Controller R-407A many R-410A high-side requirements exceedThe McDonnell & Miller 157S P Controller (Part #175802) is a precision engineered combination low water cut off and pump controller designed for commercial and industrial steam boilers of any steaming capacity. As the direct replacement for the legacy McDonnell & Miller 157S, this unit integrates a manual reset mechanism to ensure rigorous safety protocols in the event of a low water condition. Featuring a robust Monel bellows for superior corrosion