the 20028601S is the official Amana-Goodman 20028601 cross reference and acts as the premium performance upgrade for that legacy part number

This is a standard 24 VAC control valve

connected commercial thermostat specifically engineered for RTU and AHU applications

the Emerson 048812 is rated for a 650 PSI max working pressure

eliminating the calibration complexities found in digital alternatives

McDonnell & Miller 157S Controller R-410A the 20028601S is the officialThe 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