McDonnell & Miller 157S Controller R-410A Key Benefits for Contractors: Precision

Key Benefits for Contractors: Precision Sampling: Optimized straight-tube design minimizes air turbulence for highly accurate static pressure readings

Environmental Protection: Encapsulated coil construction prevents shorts caused by condensation and environmental debris common in outdoor HVAC units

S1-THPU32HP7Y

Designed with a 1/2-inch crank arm

21-27 bracket gasket

McDonnell & Miller 157S Controller R-410A Key Benefits for Contractors: PrecisionThe McDonnell & Miller 157S is a heavy duty combination low water cut off and pump controller engineered for commercial and industrial steam and hot water boilers. This specific OEM part #173502 features the 157S series head mechanism (part #173003) equipped with a snap acting SPDT switch. Designed for high pressure applications up to 150 psi (10. 5 kg cm), this controller ensures precise liquid level management, acting as a critical failsafe by