Nexus 21 L-85 - Page 40

28a. Press the “Down” button on the Backup Switch to lower your system, then press “Up” to stop it at your desired height.
28b. Plug the Height Limit Insert into an available RJ45 port on the Control Box to limit the extension to the current position of the system.
Note: Using a Height Limit Insert is not required if you are using the full travel of the system.