A sensor tube spans the interior of a return air duct to monitor passing airflow. The tube connects to a control box mounted on the exterior of the duct. A 120-volt power supply connects to the control box using wiring installed by the electrical contractor, drawing power from lines L1, L2, and L3.
L3 L1 L2 R1 UNIT POWER SUPPLY E.C. AIR FLOW SENSOR TUBE RETURN AIR DUCT CONTROL BOX 120 VOLT WIRING BY E.C.
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