Modulex EXT Commercial Series Boilers User Manual
CHAPTER 2: General Information
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AERCO International, Inc.
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100 Oritani Dr.
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Blauvelt, NY 10913
OMM-0095_0H
09/15/2017
Phone: 800-526-0288
GF-139
WARNING!
Should overheating occur, or the gas supply fail to shut off, do not turn off or disconnect
the electrical supply to the pump. Instead, shut off the gas supply at a location external to
the boiler.
2.8.3 Water Quality Requirements
NOTE:
For additional information concerning water quality and treatment, refer to AERCO technical
documents Glycol Directive and AERCO Piping Application Guide (GF-136-P).
Unsuitable heating system water can cause the formation of scale or sludge, which affects
system efficiency. It can also cause corrosion and reduce life of the heat exchanger.
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You must follow guidelines for boiler water quality.
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Thoroughly flush the system prior to filling.
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Follow the cleaning instructions.
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Never use water to fill the heating system that has been treated by reverse osmosis,
deionization, or distilled water in order to soften the water.
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Do not use inhibitors or other additives unless approved by AERCO for that purpose.
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When frost protection of the heating system is desired, only use AERCO-approved
antifreezes. The allowed maximum concentration is 50%.
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When using oxygen-permeable pipes, e. g. for under floor heating systems, you must
separate the system from the boiler using plate heat exchangers.
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Close the valves of the boiler while flushing the system, do not introduce any system cleaner
into the boiler loop. Flush system thoroughly to remove all system cleaner before filling
boiler.
Approved antifreeze (maximum concentration of 50%):
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Sentinel X500 (available from AERCO)
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Rhomar RhoGard Mutli-Metal (AL safe)
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Noble Noburst AL
Approved system cleaners:
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Sentinel X300 (available from AERCO)
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Noble Noburst Hydronic System Cleaner
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Fernox F3 Cleaner
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Rhomar Hydro-Solv 9100
The system cleaners from NoBurst, Rhomar, and Fernox are NOT to be used in the boiler itself.
The boiler must be closed off (valves closed) from the rest of the system or not connected while
the cleaners are in the system. The system should then be drained and then thoroughly flushed
with clean water to remove all the system cleaner.
Approved inhibitors:
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Sentinel X100 (available from AERCO)
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Rhomar Pro-tek 922
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Noble Noburst AL inhibitor
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Intercool NFP-AA
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Cryo-tek 100/Al