a sensor with a cracked ceramic insulator or deep pitting must be replaced to ensure system reliability

this main burner is designed to work within the standard Lennox manifold assembly

Proper installation requires careful attention to the capillary bulb placement to prevent premature cycling or evaporator freeze-ups

a critical detail for ensuring proper shaft engagement and clearance within the venturi set

With a 20-micron outlet pad

McDonnell & Miller FS4-3RP-T Switch Els PW 29614 a sensor with a crackedThe McDonnell & Miller FS4 3RP T (Part #114639) is a standard setting liquid flow switch engineered for heavy duty service in commercial HVAC and hydronic systems. This paddle flow switch features a 1" NPT connection and is designed to provide reliable equipment protection in chilled water, boiler, and process applications. Equipped with high sensitivity SPDT switch contacts, it seamlessly integrates into control circuits to cycle pumps, fire alarms,