Modulex EXT Commercial Series Boilers User Manual
CHAPTER 8: Maintenance Schedule
Page 132 of 144 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0095_0H
09/15/2017 Phone: 800-526-0288 GF-139
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.
8.12.1 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 8-21: Modulex Heat Exchangers – Cut-Away View
CAUTION!
Use only plastic-bristled brushes, not wire brushes, during cleaning. Wire brushes could
damage the surface of the aluminum heat exchanger rods.
2. Wash the combustion chamber underneath with water. Avoid getting the electrical
harnesses and components wet. During this operation, inspect the condensate drain pipe
to determine if it is free of obstructions; wash water should drain freely from the
condensate drain pipe.
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