Mandatory Requirements - Watts AERCO Modulex EXT Series Technical Application Manual

Modulex EXT Series Piping

MANDATORY REQUIREMENTS

SECTION 1: MANDATORY REQUIREMENTS
The following actions are mandatory to ensure proper piping and drainage of the Modulex EXT system.
CAUTION!
Local codes and authorities must be consulted prior to installation.
•
AERCO requires that the boiler loop to be de-coupled from the system loop. This can be achieved by
one of the following:
o Employing primary-secondary piping.
o Installing a hydraulic separator between the boiler and the system loop.
o Installing a heat exchanger
water treatment used in the system is not Aluminum compatible, the use of a heat exchanger
between the system and the boiler piping is MANDATORY.
•
AERCO requires cleaning of the whole system and to fit a mandatory Y-strainer on the return pipe to
the boiler, equipped with isolation valves (See Figure 13 through 20 at the end of this document).
•
For boiler replacement installations, cleaning of the whole system is required before connecting the
Modulex boiler (See Section 2.3 for Flushing, Treatment, and Cleansing tips and guidelines). Failure to
clean a system will limit it from the full benefits offered by the high efficiency Modulex boiler.
•
Boiler drain valve and condensate drain trap should be arranged to permit the fluids to drain freely, by
gravity, to a convenient floor drain.
•
For units installed in environments likely to experience freezing temperatures, it is necessary to ensure
that the condensate line and exhaust manifold are equipped with suitable freeze protection, such as a
heat trace line.
•
Relief valve must be installed vertically in the top, side, or to a valveless header connected to the water
supply outlet.
•
Locate water supply and return fittings (i.e. unions, elbows, etc.) a minimum of 6 inches from the boiler
fittings to prevent interference with the removal of the boiler panels and covers.
•
All piping and electrical connections (i.e. service switches, conduit boxes, etc.) should be located at a
minimum of 6 inches from the boiler panels and covers.
•
For all outdoor applications, electrical connections must either be NEMA4 rated or protected by a
suitable outdoor enclosure.
•
See Table 1 (Section 3) for sizing guidelines for the mandatory primary pump and boiler strainer.
•
A discharge pipe must be used and must not have an internal cross-sectional area less than the outlet
of the relief valve.
•
The discharge pipe must be installed so that there will be no danger of scalding to the boiler attendants.
See Figure 1, below, for a discharge pipe example on the Modulex boiler.
•
The relief valve point of discharge piping must have provisions for proper drainage.
TAG-0099
Application Guide
(e.g. plate heat exchanger) between the boiler and the system loop. If
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Phone: 800-526-0288
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10.07.2021