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SECTION 2
EXE-IOM-230112
ƒ Install filtration in the common loop or per boiler to remove particulates if
appropriate. A #4 or finer mesh size is required.
ƒ Install bypass chemical feeder for corrosion inhibitor maintenance if
appropriate.
ƒ Install corrosion coupon holder to assess corrosion inhibitor performance if
appropriate.
ƒ Before installing the boiler into a hydronic loop, be sure that the system
piping and any other components of the system are clean and free of
debris and any foreign matter. The hydronic system must be completely
flushed prior to installing the boiler.
FIGURE 3 - TYPICAL WATER SIDE PRESSURE DROP
ƒ Variable Primary Piping Arrangement
This boiler is designed for installation in variable primary flow piping
arrangements (see Figures 4 and 5), sometimes referred to as full flow systems.
This arrangement eliminates temperature mixing associated with primary-
secondary piping, thereby delivering the lowest temperature water directly
to the boiler return connections and increasing thermal efficiency of the
condensing boiler plant.
Adhere to the following for variable primary piping arrangements:
ƒ Select secondary (system) pump(s) with sufficient total dynamic head for
the pressure drop of the loop at design flow. See Figure 3 for the boiler
water pressure drop. This boiler will automatically perform a safe shutdown
in the event of a low flow condition; however, proper design flow is
required to deliver heat to the users and prevent nuisance lockouts.
ƒ Install a motorized isolation valve per boiler. This eliminates flow through
idle boilers in accordance with ASHRAE 90.1-2013 (6.5.4.3.2). Blending of
unheated supply water impacts temperature control operation and can
cause manual reset high temperature lockouts.
Questions? Please Contact Your Local Manufacturer's Representative
INSTALLATION
!
WARNING
All information in this manual is for
reference and guidance purposes,
and does not substitute for required
professional training, conduct,
and strict adherence to applicable
jurisdictional/professional codes and
regulations.
Ensure all labels on the boiler are
legible. All connections and safety
devices, both mechanical and
electrical, must be kept clean, with
ease of access for inspection, use and
maintenance.
Do not store or use gasoline or other
flammable vapors and liquids or
corrosive materials in the vicinity of
this or any other appliances.
L
NOTE
The upper water connection is the
boiler supply (outlet). The lower water
connection is the boiler return (inlet).
2-7
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