The System Sensor D4120W is a high-performance 4-wire photoelectric duct smoke detector specifically engineered for harsh environments and outdoor rooftop HVAC installations

the 24 VAC solenoid coil (part number 1472553843 often found with this assembly) is removable

1 Cv rating ensures minimal pressure drop across the 1/4" NPT ports for consistent fuel delivery

Utilizing genuine Trane furnace parts like the BNR0970 ensures the mechanical integrity of the burner rack

Conbraco 24-305-03 Valves 318172-701 The System Sensor D4120W isThe Conbraco 24 305 03 is a high performance liquid level gauge valve engineered for demanding industrial and commercial tank monitoring applications. Constructed from heavy pattern rough bronze, this valve set is designed to provide reliable service in high pressure environments, featuring a 3 4 inch NPT male connection for a secure, leak resistant interface. The internal assembly utilizes a PTFE with Hypalon glass seal and braided PTFE with Aramid