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To install a LiftMaster K709 garage door opener, first, assemble the rail and attach it to the motor unit according to the manufacturer's instructions. Next, secure the motor unit to the ceiling using the provided brackets and hardware, ensuring it's level. Install the door bracket on the garage door and connect it to the opener's arm. Finally, follow the wiring instructions to connect the opener to the power source and program the remote controls as needed.

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1w ago

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