Lochinvar & A.O. Smith 100110811 Switch 340793-762 veteran contractors must use a

veteran contractors must use a calibrated manometer to set the gas valve pressure and a combustion analyzer to confirm safe CO2 and CO levels after the conversion is complete

Always verify your specific model and serial number against the manufacturer’s parts manual to ensure a correct match

If the internal element melts due to excessive heat

this model is hardwired and requires a 24VAC common (C) wire to function

Lochinvar & A.O. Smith 100110811 Switch 340793-762 veteran contractors must use aThe Lochinvar & A. O. Smith 100110811 Blocked Outlet Switch is a critical safety component designed for high efficiency commercial water heaters and boilers, including the Cyclone BTH and Armor series. This OEM pressure switch functions as a normally closed (NC) SPST contact, engineered to monitor flue gas backpressure. If the exhaust venting becomes obstructed or the pressure rises above the calibrated set point, the switch opens, breaking the 24V