When replacing the head assembly on a 150S-M-MD

Designed for industrial and residential heating oil burner ignition systems

While many Lennox coils utilize bolt-on TXVs for easier field replacement

the regulator allows for precision field adjustments between 3" and 5" W

Industrial Build: Heavy-duty hub and blade assembly designed to withstand the thermal cycling common in HVACR operation

Hydrolevel EL1220-SV Sensing Probe R-22 When replacing the head assemblyThe Hydrolevel EL1220 SV is a specialized low water cut off (LWCO) sensing probe designed for high performance liquid level monitoring in hydronic heating and steam boiler systems. Featuring a rugged short ceramic insulator, this 45 221 part number is engineered for tight clearance installations where standard probes may interfere with internal castings or piping. The 1 2" NPT threaded connection ensures a secure, leak proof seal, while the 2 1 16"