Lochinvar & A.O. Smith 100113144 Switch 321894-709 it is professionally recommended to

it is professionally recommended to strictly follow the manufacturer's wiring diagram to maintain the electrical integrity of the safety loop

provided the connector matches

The V-bolt design allows for rapid centering and tightening with a 10mm wrench

which means the contacts close at 28°F to signal the defrost board and open again at 70°F once the coil is sufficiently warmed

the FAN2778 provides the exact static pressure performance needed to maintain system efficiency and prevent high-head pressure trips during peak summer loads

Lochinvar & A.O. Smith 100113144 Switch 321894-709 it is professionally recommended toThe 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.