Modulex Light Commercial Series
CHAPTER 9: Spare Parts Drawings and Lists
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8.12 Cleaning The Heat Exchanger
Over time, hard combustion by-
product deposits can form on the combustion chambers’ heat
exchanger elements. Routine annual maintenance may be sufficient to keep these elements
clean. However, if the by-product build-up is too great, the efficiency of the heat exchanger will
degrade and the unit’s overall efficiency will decline.
If an inspection of the heat exchanger reveals a build-up of combustion by-product deposits,
complete the instructions below to clean the heat exchangers mechanically (section 8.12.1) and,
if necessary, with a chemical cleaning solution specifically designed for removing combustion
by-products from the fire side of aluminum heat exchangers (section 8.12.2).
It may not be possible to completely restore the boiler to original factory condition. However, the
instructions below should remove most of the by-product buildup. It will also loosen some of the
buildup that remains, which the boiler will then shed during normal operation.
Mechanical Cleaning of the Heat Exchanger
Complete the instructions below to mechanically remove as much combustion by-product as
possible from each burner’s combustion chamber.
Mechanical Cleaning of the Heat Exchanger
1. Use a stiff, plastic-bristled brush to remove larger deposits from the heat exchanger rods.
Try to remove all large deposits. The lower rods, being closer together, are harder to
reach. It won’t be possible to reach all rows of pins, however a combination of different
sized brushes may be useful.
Figure 8-26: Modulex Heat Exchangers
– Cut-Away View
C A U T I O N !
Use only plastic-bristled brushes, not wire brushes, during cleaning. Wire brushes could damage
the surface of the aluminum heat exchanger rods.
