What causes original heating elements to fail requiring an electric heat restring

Field Versatility: Features reversible rotation and stud mount configuration to accommodate various condenser unit designs

By managing day-night changeover or summer-winter cycles via supply pressure variations

It must be paired with S350 stage modules (such as the S350A

providing the consistent negative pressure required to clear flue gases and prove the pressure switch

Lochinvar & A.O. Smith 100110811 Switch L99H008 What causes original heating elementsThe 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