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AERCO International, Inc.
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100 Oritani Dr.
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Blauvelt, NY 10913
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Ph: 800-526-0288
GF-115-H
OMM-0083_0B
Modulex MLX Series Gas Fired Boiler System
Operation and Maintenance Manual
Chap 13: Boiler
Water Quality
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For boiler retrofit/replacement installation, it will be necessary to repeat the cleaning process until the
draining water appears to be clear. Once clear, the above TDS comparison (or a turbidity test)
should be performed.
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If a flushing machine is used in the cleaning process, carefully follow the manufacturer’s instructions.
If the flushing machine is designed to flush individual zones, the TDS comparison must be made
between each zone and the make-up water, or the turbidity test performed for each zone.
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Add corrosion and scale inhibitor after the system has been declared clean, using the appropriate
amount recommended by the manufacturer. Introduce the Multi-Metal protector/scale inhibitor to the
system following the chemical treatment manufacturer’s instructions. Adding inhibitor to a dirty
system reduces its effectiveness. It is better to add more inhibitor than less – that is, it is better to
exceed the recommended amount than less.
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When refilling the system, ensure the boiler is not air-bound by opening the pressure-relief valve
located at the rear of the boiler. Leave the relief valve open until a steady flow of water is observed.
Close the valve and finish filling the system.
13.4 Water Quality Maintenance and Boiler Warranty
Heat exchanger failures due to improperly cleaned/treated and poorly maintained water are not covered
under warranty. Scheduled system/boiler water maintenance is required to maintain the heat exchanger
warranty. AERCO shall reserve the right to require maintenance records when evaluating warranty
claims.
13.5 Water Treatment Certification
When using chemical treatments in hydronic systems, it is necessary to ensure that the chosen treatment
is appropriate and certified by the manufacturer for such environments. The manufacturer should also
guarantee that the treatment, when applied according to the manufacturer’s recommendations, will not
cause harm to the boiler, pumps, piping, and other components of the hydronic boiler system.
13.6 Water Treatment Analysis and Scheduling
The proper mixture of water, chemical treatment and glycol (if used) should be ascertained based on a
sample of the system water and the make-up water. Your local water treatment company, or one of the
manufacturers listed below, may analyze your sample. Adjust the chemical composition of your system
water based on the analysis. After this initial analysis, the chemical composition of your system water
should be tested at the beginning of the heating season for boilers operated to provide comfort heat.
However, for boilers operating year round, this analysis should be made at least twice a year.
