Open System Preferences and select Printers & Scanners
Click on the + sign in the lower left corner to begin adding a new printer
Go to the IP tab on the new Add window that opens and use the following information
Address: 10.24.8.229
Protocol: HP JetDirect - Socket
Queue: leave blank
Name: MHL37Z9
Location: MH Library L37
Use: HP DesignJet Z9 Pro Dual Roll 44inch
Click Add
Click quit at the finish up screen
The new printer will now show up in the Printer List.