Operating instructions
Heatmax Furnace Installation and Operation Manual   
28 
1.  Remove the door (F) and place it on a stable work surface, handle down. 
2.  Using pliers, remove the door gasket (A). 
3.  Using a scraper or a small flat screwdriver, remove the adhesive left in the gasket 
grove in the door then clean the surface using a commercial vacuum. 
4.  Use a Phillips screwdriver or a power drill to remove the screws (B) that holds the glass 
retainer (C). 
5.  Remove the glass frame (D) 
6.  Remove the glass (E) (or pieces of glass if it is damaged) and clean the inside of the 
door frame. 
7.  Remove the old glass gasket. 
8.  Install the new gasket on the glass. Remove a part of the paper covering the gasket 
adhesive. Center the gasket on the edge of the glass so that when folded and glued, 
the gasket is equal on both sides. Do not stretch the gasket during installation. Remove 
a majority of the paper, turn the glass to facilitate and complete the installation of the 
gasket. When you return to the starting point, cut the gasket so that the ends overlap 
by about ½ inch. 
9.  Install the glass (E) and glass frame (D) and centering it in the frame of the door and 
install the glass retainer frame (D) and glass retainers © taking care not to over tighten 
the screws (B). Note that the two main causes of glass breakage are unequal position 
in the door and screws too tight. 
10. Install the new door gasket (A). To do this, use about ¼ inch. (6mm) of adhesive to the 
bottom of the groove that holds the gasket in the door. Then lay the new gasket 
starting from the center of the hinge side and taking care not to stretch the gasket 
during installation. Leave about ½ inch of gasket exceed the frame of the door. Once 
jointed, push the fibers protruding towards the inside of the groove in the adhesive. 
Install the door and let dry for 24 hours before using the furnace. 










