MC2: 10/03/12 Page 27 of 90
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
CHAPTER 5: PIPING
See Piping Guide GF-115-P-H for in-depth piping information.
5.1 Makeup Water Quality
Installation water must be checked, monitored, maintained and treated per GF-115-P-H.
NOTE
Failure of the boiler due to water quality is not covered under warranty.
See Appendix C, Boiler Water Chemistry and Maintenance for more
information about water quality.
5.2 Maximum Allowable Working Pressure
The Modulex boiler has a maximum allowable working pressure of 92
psi (634kPa, 6.34 bar), and a minimum of 15 psi (103 kPa, 1 bar).
5.3 Boiler Loop Design Guidelines
For proper and safe operation of the water tube Modulex boiler, the primary (boiler) loop piping and the
associated fittings and accessories must be designed/selected as discussed in the following sections.
5.4 CSD-1 Manifold Assembly (Supplied)
The installation of a low water cutoff, manual reset high limit aquastat and an ASME compliant safety
pressure relief valve designed for the boiler output capacity are required. These major components
along with a manifold and several others are supplied with the boiler and must be assembled and wired
when installing the boiler at the site. The manifold assembly components supplied are:
• 3/4” Pressure Relief Valve
• Manifold Assembly [2-1/2” x 16” long (64 mm x 406 mm)]
• 2-1/2” NPT Union
• Low Water Cut-Off Switch
• Aquastat
• Pressure/Temperature Gauge
5.5 Connecting Supply And Return Piping (Per ANSI Z21.13a)
Reference the following points when designing supply and return piping:
• 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 boiler water during the
cooling cycle.
• A hot water boiler installed above radiation level or as required by Authority having jurisdiction,
must be provided with a low water cutoff device either as a part of the boiler or at the time of the
installation.
•
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