Notice the bottom of each page -- the manual was apparently put out by Kristia Associates of Portland, Maine, about 60 miles from here. Looks like it was a guide book for their repair techs to use. Great information!
Kristia was an early major importer of Jotul stoves beginning in the 1970s, and was bought out by Jotul to form the base for their US operations. See links below, search for "Kristia" -- interesting background and history. http://www.j-ofireplaces.com/FactoryInfo.htm
This link is broken, either the page no longer exists or there is some other issue like a typo.