IBC HC Series Installation And Operating Instructions Manual page 27

WARNING
Close fill valve after any
addition of water to the
system, to reduce risk of
water escapement.
NOTE
Application drawings can be
downloaded from our web site.
www.ibcboiler.com
NOTE
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.
NOTE
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.
WARNING
Ensure the gas ignition
system components are
protected from water (dripping,
spraying, rain, etc.) during
appliance operation and when
servicing (pump replacement,
condensate trap servicing,
control replacement, etc.)
INSTALLATION
HC SERIES BOILERS HC 13-50, HC 23-84, HC 29-106, HC 20-125, HC 33-160
Figure 24: Boiler trim basic options – concept drawing. This drawing is only a simple
schematic guide.
Do not place any water connections overhead the boiler; leaks can damage
the fan and controls. If needed, create a shield over the top of the cover, but
allow clearance for airflow and service access.
For best results, use a Primary: Secondary piping system, with a boiler loop
using 1" (1-1/4" for the HC 33-160) piping for the HC Series Boilers. The boiler
comes with the boiler (primary) pump installed in the boiler and will provide
adequate flow for the boiler and primary loop piping only.
The minimum flow rate required through the heat exchanger is 2 USgpm with a
maximum of 11 USgpm allowed. Primary/Secondary piping ensures adequate
flow and de-couples Δ°T issues (boiler vs. distribution). Aim for a 20° to 30° F Δ°T
across the heat exchanger at high fire.
The HC Series modulating boilers are designed to supply the heating load with
temperatures within the range of 86°F to 194°F. Use closely spaced tee's to
connect each pumped space heating load to the primary loop. As an option, a
hydraulic separator or buffer tank can be used to separate the heating loads from
the boiler.
Ensure the pump is rated for the design circulating water temperatures; some
pumps have a minimum water temperature rating above the low temperature
potential of the boiler. Following installation, confirm actual performance by
measuring Δ°T (under high and low flow conditions) after establishing the correct
firing rate.
A variety of application drawings showing basic design options are available from
the IBC web site at www.ibcboiler.com
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