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Modulex Light Commericial Series
CHAPTER 8: Maintenance Schedule
Cleaning the Heat Exchanger with Cleaning Solution
If mechanical cleaning has not removed all of the build-up, complete the instructions below to
clean the heat exchangers with 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.
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.
minutes, as over-exposure could damage the heat exchanger.
Collect and dispose of the used solution and rinse water according to local regulations –
5.
DO NOT dispose of rinse water into the environment or local sewer system.
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.
OMM-0087_J • GF-143 • 11/17/2020
WARNING: do not let this solution sit for more than 20
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
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