I've just bought a boat which has a Heart Freedom Marine Series COMBI inverter/charger - product number 81-1011-12 which I believe is model 10. It is US spec 110 but I may have a manual you are after. One is the owners manual with installation guide. The other is an addedum to the installation guide which is far more detailed with high level circuit diagrams. If you are still hunting let me know and I will scan manuals to a PDF.
Bit late now maybe but I have found the the contact details for the people who service Heart (Xantrex) units in the UK.
I wouldn't get your hopes up too much though as Xantrex only supply modular replacements now which, when I contacted Intellitec below, made the repair to my 10 yr old Freedom 20 too much of an economic gamble.
Still, it may be worth a phone call. The details are:-