No experience with HP printer here, but on our Océ plotter we need to set a rotation in Page Setup > Properties > etc etc (printer settings). Not so much an ArchiCAD issue as a printer / driver issue.
To avoid having to do the same settings over and over, we use a printing publisher set in our template with all paper sizes and orientation predefinded as subfolders. When creating or modifying layouts it's just a matter of dragging them to the correct subfolder in the publisher set and just print by publishing the layouts.
Erwin Edel, Project Lead, Leloup Architecten
www.leloup.nlArchiCAD 9-26NED FULL
Windows 10 Pro
Adobe Design Premium CS5