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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
Adjustable Low Fire: Includes a bypass setting to maintain a constant minimum firing rate for consistent ignition and flame stability
000 BTU/hr capacity is managed with surgical precision
For air differential applications
Lennox 94W83 Ignition Board 321702-401 The System Sensor D4120 isAs an experienced HVAC technician, you know that the Lennox 94W83 Ignition Board is a critical OEM replacement part for maintaining system reliability in single stage residential furnaces. This integrated furnace control (IFC) is specifically designed to manage systems utilizing Single Stage PSC Motors and operates within a standard 18 30 VAC range. When troubleshooting a furnace not heating, verifying the 103085 03 sequence is essential, as this
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