Various lists of Liebert AC models and their product numbers are available online, including some lists that link to the appropriate manuals. An example of this type of list is found on International Power & Environmental's website.
For product manuals, Home Appliance Manuals Online offers a helpful lookup service, though the listings for Liebert AC models are limited as of March 2015. However, this site does offer the facility to ask other users for help locating the manuals for specific models.
To request a specific model's manual, users should check the product number on another listing site or on the appliance itself, then input this into the Ask the Membership pop-up box. A picture can be added to help with identification if necessary.