MODULEX EXT 321, 481, 641, 802, 962, 1123 BOILERS
Installation, Operation & Maintenance Manual
Page 66 of 146 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0087_0F
07/13/15 Phone: 800-526-0288 GF-143
WARNING!
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, the water must be treated until
below the maximum value of 9 grains.
The pH value of the installation water must be between 6.5 and 8.5. 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.
WARNING!
Failure to adhere to the water quality requirements will result in a
voidance of warranty.
Filling Locations and Preparation 3.31.2
• For filling the system, a filling tap must be inserted on the system return pipe.
• Filling can also be accomplished through the draining tap on the boiler return manifold.
• In both cases, an approved hydraulic disconnection system must be fitted.
• Before connecting the boiler, carefully rinse out the whole system with running water.
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