Modulex Light Commercial Series
CHAPTER 9: Spare Parts Drawings and Lists
OMM-0158_A
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Figure 8-27: Angle of Cleaning Instrument
– Heat Exchanger Cut-Away View
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.
3. The most crucial area to clean is the bottom of the heat exchanger, where the heat
exchanger pins are the closest. This can be done by removing one of the exhaust manifold
“blanks” and using a pressure washer with angled nozzle to spray upwards. Make sure to
cover the top of the heat exchanger with a tarp to prevent water from spraying out of the
top of the unit. To clean this area manually, insert your cleaning instrument at an angle
between the pins, as shown in Figure 8-27. Be sure to clean the space between each pin.
4. Repeat the previous step on each burner module in the unit.
5. After mechanical cleaning, rinse each heat exchanger with water until no further debris
comes out.
6. After washing the aluminum components, make sure the condensate siphon is free of
obstructions, cleaning it if necessary.
7. Blow compressed air into the combustion chamber to remove any dirt clogging the
aluminum pins on the combustion chamber walls. Remove any remaining buildup from the
heat exchanger, particularly on the lower heat exchanger pins, with a stiff plastic brush.
