Comfort Heating and Cooling, an HVAC company based in Fredericksburg, Virginia, offers various "Mr. Slim" products and manuals on their website. Depending on the model of heat pump, a customer may be able to find a free, downloadable version of the owner's manual there.
"Mr. Slim" products are part of a line manufactured by Mitsubishi, and there are numerous types of heat pumps that are sold under that name. Customers need to know the type of Mr. Slim heat pump they are looking for in order to find the correct manual. Comfort Heating and Cooling's website should help customers in their search, though, and would be the best place to start.