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Leak-Free Reliability: Engineered for high-pressure durability
The double-pole design allows for simultaneous switching of multiple power legs or secondary loads
Replacing a cracked or clogged collector box is vital for preventing water-related damage to the secondary heat exchanger heat pins and ensuring consistent unit operation during peak heating cycles
Common Questions What is the maximum flow velocity for the A-22P-A09
many R-410A high-side requirements exceed this range
McDonnell & Miller 157S-P Controller R-407A Leak-Free Reliability: Engineered for high-pressureThe 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
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