Cleaning The Heat Exchanger With Cleaning Solution - Watts AERCO EXT Installation, Operation & Maintenance Manual

Modulex EXT Commercial Series
CHAPTER 8: Maintenance Schedule
Figure 8-22: Angle of Cleaning Instrument – Heat Exchanger Cut-Away View
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 8-22. Be sure to clean the space between each pin.
4. Repeat the previous step on each burner module in the unit.
5. 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.

8.12.2 Cleaning the Heat Exchanger with Cleaning Solution

If mechanical cleaning has not removed all of the build-up, use a cleaning solution specifically
designed for removing combustion by-products from aluminum heat exchangers. The product
approved by AERCO is AXI-Therm Boiler Combustion Side Cleaner, Part A and Part B. The
instructions below require 4 to 12 oz. (120 mL to 360 mL) EACH of Part A and Part B per
100,000 BTU/hr. of unit capacity.
C A U T I O N !
Use of neoprene gloves and protective goggles is recommended. Consult the Axiom Industries
web site (axiomind.com) for additional health and safety information.
1. Spray undiluted AXI-Therm Boiler Combustion Side Cleaner, Part A directly onto all the
heat exchanger's internal surfaces, continuing till they are completely wet. A heavy
application of the solution should reach most of the surfaces that cannot be seen.
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