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General| Model Number | 139.53990 |
|---|---|
| Horsepower | 1/2 HP |
| Frequency | 60 Hz |
| Remote Controls Included | 2 |
| Safety Sensors | Yes |
| Max Lift Power | 1/2 HP |
| Drive System | Chain Drive |
| Voltage | 120V |
| Maximum Door Height | 7 ft |
List of essential hand tools required for assembling and installing the garage door opener.
Factors and requirements specific to installing openers on sectional garage doors.
Factors and requirements specific to installing openers on one-piece garage doors.
Specific steps for determining header bracket placement for doors with tracks.
An example calculation to determine the correct header bracket height for one-piece doors.
Procedure for mounting the header bracket onto a wall structure.
Procedure for mounting the header bracket onto a ceiling structure.
Guidance for attaching the rail when replacing a previous Craftsman opener.
How to position the opener for doors with tracks.
How to position the opener for one-piece doors without tracks.
Wiring details for connecting an optional keylock accessory to the door control.
Steps for making a permanent electrical connection to the motor unit.
Essential details on the safety sensor's function, placement, and importance.
Preferred method for attaching sensor brackets to door tracks.
Steps for mounting sensor brackets directly onto a wall.
Steps for mounting sensor brackets onto the garage floor.
Procedure for aligning the safety sensors for proper beam detection.
Common problems and solutions related to the safety reversing sensors.
Specific steps for fastening the door bracket on sectional doors.
Specific steps for connecting the door arm on sectional doors.
Detailed steps for adjusting UP and DOWN travel limits for one-piece doors.
Guidance on determining when and how to adjust the travel limit settings.
Detailed instructions for testing and adjusting the force controls.
Explanation of the motion detector, light, and lock features of the control console.
How the automatic light activates and can be disabled.
How to enable or disable the lock feature to prevent remote operation.
Information on when and how to re-adjust travel limits and force settings.
Recommended periodic checks and maintenance tasks for optimal opener performance.
Steps to program new hand-held remote controls to the opener.
Procedure to clear all previously programmed remote and keyless entry codes.
