Modulex EXT Commercial Series Boilers User Manual
CHAPTER 8: Maintenance Schedule
Page
134
of
144
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0095_0H
09/15/2017
Phone: 800-526-0288
GF-139
CAUTION!
Use of neoprene gloves and protective goggles is recommended. Consult the Axiom
Industries web site (axiomind.com) for additional health and safety information.
Chemical Cleaning of the Heat Exchanger
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.
2. Let stand for 10 to 20 minutes to allow the product to react.
WARNING: do not let this
solution sit for more than 20 minutes, as over-exposure could damage the heat
exchanger
.
3. Use a plastic bristle brush to clean the elements that can be reached, and then rinse all
surfaces with clean water.
4. Next, spray undiluted
AXI-Therm Boiler Combustion Side Cleaner, Part B
directly onto
all heat exchanger surfaces, allow to stand for 10 to 20 minutes, and then rinse with plenty
of clean water. This step creates a thin oxide layer on the aluminum pins, which protects
them during operation.
WARNING: do not let this solution sit for more than 20
minutes, as over-exposure could damage the heat exchanger
.
5. Collect and dispose of the used solution and rinse water according to local regulations –
DO NOT dispose of rinse water into the environment or local sewer system.
8.12.3 Repeat Cleaning
The procedure in the previous section will remove smaller deposits and loosen larger deposits.
If there are still large deposits, repeat the manual cleaning process in section 8.12.1. At this
point a stiff plastic bristle brush should remove a significant amount of buildup.
If large deposits still remain, repeat the chemical cleaning process in section 8.12.2. After
cleaning with AXI-Therm, deposits will be loosened. The expansion and contraction of the heat
exchanger during normal operation will continue to shed debris.
8.13 REASSEMBLY OF THE BURNER MODULES
Follow the instructions to reassemble the burner modules:
Reassembling the Burner Modules
1. After the cleaning of the combustion chamber and/or the burners, inspect the condensate
drain pipe to determine if it is free of obstructions; wash water should drain freely from the
condensate drain pipe. Also make sure the condensate siphon is free of obstructions,
cleaning it if necessary.
2. Reposition the burners into their proper positions.
3. Position the new gaskets onto each burner module and ensure proper positioning. Make sure
all surfaces are smooth and free of debris.
WARNING!
The burner gaskets
MUST
be replaced at every cleaning.