[. . . ] MODEL (950-4030) AD-1 SPEED CONTROLLER INSTALLATION BEFORE INSTALLATION PLEASE NOTE: All wiring must be done in accordance with the NATIONAL ELECTRICAL CODE (NEC) and applicable local codes. [. . . ] Connect the Black motor wire from fan to the WHITE wire from speed controller. Connect the BLACK wire from speed controller to the 115 Volt source (L1). NOTE: Refer to wiring diagram below. SPEED CONTROLLER CHECK OUT PROCEDURES Step 1. Turn the dial in a clockwise rotation and listen for a "click", then stop rotation. Continue to rotate the dial in a clockwise position until the dial stops. NOTE: Should further information be required, contact the Tjernlund Products, Inc. [. . . ] Technical Assistance Department at 1-800-255-4208, 7:30 AM-4:30 PM CST. [. . . ]