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Manual abstract: user guide CHAMBERLAIN 801221SCHEMA
Detailed instructions for use are in the User's Guide.
[. . . ] â· Install the safety reversing sensor so beam is NO HIGHER than 6" (15 cm) above garage floor. Sensor beam (A) should be no higher than 6" (15 cm) above floor. [. . . ] Floor installation (optional) Attach with concrete anchors (A) (not provided). Sensor beam (B) should be no higher than 6" (15 cm) above floor. Wall installation (optional) Fasten 2x4 to wall with lag screws (not provided). Wall installation with extension brackets (A) (optional) Attach with concrete anchors (not provided). Cut exposed wire down to the insulation. Using the four locking connectors, insert the new wire with the existing wire by color: white/black with white black, white with white. Insert the wire all the way into the connector; once crimped, the connector cannot be re-used. The garage door opener will not close from a remote if the indicator light in either sensor (A) is off (alerting you to the fact that the sensor is misaligned or obstructed). If the opener closes the door when the safety reversing sensor is obstructed (and the sensors are no more than 6" (15 cm) above the floor), call for a trained door systems technician. Without a properly installed safety reversing sensor, persons (particularly small children) could be SERIOUSLY INJURED or KILLED by a closing garage door. 8 cm) board (A) (or a 2x4 laid flat) on the floor, centered under the garage door. If the door stops on the obstruction, it is not traveling far enough in the down direction. Increase the DOWN limit by turning the DOWN limit adjustment screw counterclockwise 1/4 turn. NOTE: On a sectional door, make sure limit adjustments do not force the door arm beyond a straight up and down position. [. . . ] Increase the DOWN limit by turning the DOWN limit adjustment screw counterclockwise 1/4 turn. NOTE: On a sectional door, make sure limit adjustments do not force the door arm beyond a straight up and down position. [. . . ]
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