Lochinvar & A.O. Smith 100111020 Switch 321142-301 Contractors must verify the furnace

Contractors must verify the furnace serial number—specifically digits 3 and 4 for the manufacture year—to confirm compatibility with this LP gas conversion kit

This valve uses 1/4" barb connections for the common and normally closed ports

By utilizing the Warrick 3Z1B with 3Z1A suspension wire

the V48AE-8 ensures efficient head pressure control by modulating water flow between the condenser and the bypass line

Lochinvar & A.O. Smith 100111020 Switch 321142-301 Contractors must verify the furnaceAs a seasoned technician, you know that a Lochinvar 100111020 switch is a critical safety component designed to verify the integrity of the combustion air path. This blocked inlet switch operates as a normally closed safety limit, specifically engineered to detect air intake obstructions in high efficiency Lochinvar boilers and A. O. Smith water heaters. When the intake system faces constricted airflow due to debris or mechanical failure, the switch