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The System Sensor D4120 is an industrial-grade 4-wire photoelectric duct smoke detector designed for high-performance smoke detection in HVAC air handling systems
intended for immediate installation in compatible 48XPN and 58 series units
Smith 100111539 Controller is the current
and various flammable refrigerants (KVR 12-22 models)
Dust buildup on the blades or a loose set screw can lead to an unbalanced blower wheel
Lochinvar & A.O. Smith 100109617 Tubing 340155-7026 The System Sensor D4120 isThe Lochinvar and A. O. Smith 100109617 is a precision engineered 60 inch pilot tubing assembly designed for high performance commercial and residential water heaters. This 1 4 inch OD aluminum tubing provides the necessary durability and flexibility for routing through compact burner compartments without risking structural kinks or flow restrictions. Rated for high temperature environments, this OEM replacement pilot line ensures a consistent fuel