MC2: 10/03/12 Page 86 of 90
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
Modulex MLX Series Gas Fired Boiler System
Operation and Maintenance Manual
Water Quality
• Water treatment is also advisable in the following cases:
o Very large heating systems
o High quantities of replenished water due to leakages or maintenance works
13.3 System Flushing, Treatment, and Cleansing
Note that prior to cleaning the heating system, the boiler MUST be isolated from the piping to prevent
infusion of containments, including sludge, into the boiler. Instruction 1.3, below, shows
recommendations for flushing, cleaning, and treating the water used in the Modulex boiler system.
IMPORTANT!
Cleaning solution and inhibitors used must be compatible with heat
exchanger material. Corrosion/scale inhibitor will be ineffective if
added to a dirty system; therefore, it is very important to clean the
system first.
Water treatments used must be compatible with EPDM gaskets used in
the Modulex Boiler. (EPDM = Ethylene Propylene Diene Manomer).
AERCO recommends the following cleaning solution, inhibitor, and antifreeze products. Visit
www.aerco.com for Product Fact sheet and Material Safety Data Sheets:
Cleaning solution — Sentinel X400 Liquid System Restorer
4 x 1 gallon case – part number 99155-2
5 gallon jug – part number 99155-1
Corrosion/Scale Inhibitor — Sentinel X100 Liquid Inhibitor
4 x 1 gallon case – part number 99153-2
5 gallon jug – part number 99153-1
Antifreeze — Sentinel X500 Liquid Inhibited Antifreeze
5 gallon jug – part number 99156-1
55 gallon jug – part number 99156-2
275 gallon tote – part number 99156-3
When cleaning, treating, and maintaining, a heating system, consult a qualified professional. The
following are AERCO’s tips/guidelines for cleaning a heating system – these do NOT take precedence
over detailed instructions from qualified professionals.
• Make sure to use appropriate amount of cleaning solution, carefully following the manufacturer’s
instructions. Follow the chemical manufacturer’s recommendations when introducing cleaning agents
into the system.
• Ensure that the cleaning solution is circulated thoroughly in the system.
• Flush the system thoroughly to remove the maximum amount of contaminants. When emptying the
system, make sure it is done as quickly as possible using all drain off points and ensuring all low lying
pipework is fully drained. Opening all bleed valves ensures the system will be completely emptied.
• A reliable test to determine if a system is clean is if the Total Dissolved Solids (TDS) of the water
being drained is within 10% of the make-up water TDS. This indicates that sufficient contamination
has been flushed from the system. If the difference in TDS is more than 10%, it is recommended to
repeat the cleaning process until that is achieved. Turbidity test can be used as an alternate way to
determine if a system is clean.
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