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the S1-331-03009-000 is the direct manufacturer-specified upgrade for the discontinued 50A51-242 model
it is optimized for direct mounting in the airstream
The P74240 is an OEM-specific part designed for Aaon units
Note: Mixing tube not included
Durable Construction: Engineered with a weather-protected housing to resist environmental corrosion and moisture ingress
McDonnell & Miller 194 Controller Refrigerant the S1-331-03009-000 is the directAs a veteran HVACR technician, you know that maintaining precise water levels in high pressure systems isn't just about efficiencyit is about safety and equipment longevity. The McDonnell & Miller 194 Low Water Cut Off and Pump Controller (Part Number 166600) is the industry standard for commercial and industrial steam boilers, engineered to operate reliably in environments up to 250 PSI max pressure. This heavy duty combination LWCO and pump
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