MODERN BURNER UNIT (MBU)
UNIT MAINTENANCE PROCEDURES
To replace any part of the reflective heat shield assembly (1) or burner tube assembly (2), remove four
carriage bolts (3), washers (4) and self-locking nylon nuts (5) holding the reflective heat shield assembly
to the frame (6).
Lift the entire reflective heat shield and burner tube assembly (1,2) off MBU frame (6).
Removing Reflective Heat Shield and Burner Tube Assembly
Remove the burner tube assembly by removing four screws (7). Place new burner tube (2) or reflective
heat shield assembly (8) into position, making sure that the flange (9) of the heat shield (8) fits through
the opening on the burner well (10) and that the insulation (11) is not pinched between the heat shield (8)
and burner well (10).
Flip the entire assembly face down on a work surface and press down on the burner well to expose the
burner tube mounting plate (9). Install the burner tube assembly (2) making sure that the holes in the
burner tube face out of the reflective heat shield when the assembly is mounted back on the MBU frame