Filling Locations And Preparation - Watts AERCO EXT Installation, Operation & Maintenance Manual

Modulex EXT Commercial Series
CHAPTER 4: Installation Instructions
Before filling the heating system, the complete system, including all zones, must be thoroughly
cleaned and flushed to remove sediment.
Flush until clean water runs free of sediment. AERCO suggests using an approved system
cleaner to flush the system, but not the boiler. Always use AERCO approved antifreezes. See
the list in Section 2.8.3, Water Quality Requirements.
Never use reverse osmosis, deionized, distilled water or mineral treated water for filling the
heating system.
W A R N I N G !
Do not use petroleum-based cleaning or sealing compounds in the boiler system. Damage of
seals and gaskets in boiler and system could occur, resulting in substantial property damage
and/or danger.
The central heating installation needs to be filled with clean water. Use only clean water or
approved glycol for filling the heating system.
When the water hardness of the filling water exceeds 9 grains per gallon (gpg), the water must
be treated until below the maximum value of 9 gpg.
The pH value of the installation water must be between 6.5 and 8.0. Check the pH value using
proper equipment or by having the water analyzed by a water treatment company.
If pH differs from above, contact AERCO engineering for further assistance.
W A R N I N G !
Failure to adhere to the water quality requirements will void the warranty.

4.31.2 Filling Locations and Preparation

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For filling the system, a filling tap must be inserted on the system return pipe.
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Filling can also be accomplished through the draining tap on the boiler return manifold.
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In both cases, an approved hydraulic disconnection system must be fitted.
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Before connecting the boiler, carefully rinse out the whole system with running water.
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