Lime Scale And Corrosive Water Damage Warning; Connection To Refrigeration System Warning; Optional Air Intake Connection; Flue Manifold Installation - Watts AERCO Modulex EXT Commercial Series User Manual

Modulex EXT Commercial Series Boilers User Manual
CHAPTER 4: Installation Instructions

4.16.3 Lime Scale and Corrosive Water Damage Warning

Any damage caused to the boiler due to the formation of lime scale or by corrosive water will not
be covered by the warranty. Appropriate steps must be taken to ensure the indirect tank water
heater does not become plugged by scale caused by hard water or sediment. If the indirect tank
water heater becomes plugged by either scaling from hard water or sediment it is not the
responsibility of AERCO International.

4.16.4 Connection to Refrigeration System Warning

The boiler, when used in connection with a refrigeration system, must be installed so the chilled
medium is piped in parallel with the boiler with appropriate valves to prevent the chilled medium
from entering the boiler.
The boiler piping system of a hot water boiler connected to heating coils located in air Handling
units where they may be exposed to refrigerated air circulation must be equipped with flow
control valves or other automatic means to prevent gravity circulation of the boiler water during
the cooling cycle.

4.17 OPTIONAL AIR INTAKE CONNECTION

Install air intake connector as shown in Figure 4-10. Use silicone to lubricate the internal surface
of the seals before assembling. For air intake connection piping use only:
•
10" for MODULEX EXT 1530 / 1500, 1912
•
12" for MODULEX EXT 2295 / 2300, 2677 / 2600, 3060 / 3000
The Air Intake Connector that ships with the unit is for spiral ducts only. For other materials,
please contact AERCO directly.
AIR INTAKE PIPING
(NOT SUPPLIED)
Figure 4-10: MODULEX EXT Air Intake Connection

4.18 FLUE MANIFOLD INSTALLATION

To assemble the flue manifold to the boiler flue exhaust opening, retrieve the ten (10) nuts and
washers from the plastic bag, shipped with the boiler, and affix to the boiler opening per Figure
4-11. The Manifold may be installed on left, front, or rear. If switching to left or rear positions,
unused outlet should be covered with the plate and gasket removed from outlet being used.
OMM-0095_0H
GF-139
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Phone: 800-526-0288
AIR INTAKE
CONNECTOR
(SUPPLIED)
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09/15/2017