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featuring the correct 48Y frame size and base mounting and shaft specifications
the FAN2778 provides the exact static pressure performance needed to maintain system efficiency and prevent high-head pressure trips during peak summer loads
Technicians should verify 24V at the relay coil
allowing for straightforward installation or replacement in existing HVAC cooling loops
Lochinvar & A.O. Smith 100113144 Switch 321894-709 featuring the correct 48Y frameThe Lochinvar & A. O. Smith 100113144 Blower Prover Switch is a critical safety component designed for high efficiency water heaters and commercial boilers. As a direct OEM replacement for NS2 1333 01, this pressure switch (often referred to as an air pressure switch or draft prover switch) monitors the differential pressure created by the inducer motor. By verifying stable airflow, it ensures the sequence of operation proceeds to ignition safely.
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