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2. AR-721U Installation
2.1 Steps
1. Use the screwdriver to screw the mounting plate on the wall.
2. Pull cable ends through the access hole in the mounting plate.
AR-721U must be connected before power is applied to the
single door controller.
3. Attach the AR-721U to the mounting plate.
4. Apply power. The red LED will flash once and the beeper will
sound.
