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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 / water heater,
when used in connection with
a refrigeration system, must
be installed so the chilled
medium is piped in parallel
with the boiler / water heater
with appropriate valves to
prevent the chilled medium
from entering the boiler /
water heater.
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.)
1-22
DC SERIES BOILERS / WATER HEATERS DC 15-95, DC 15-96, DC 20-125, DC 33-160
Figure 24: Boiler / water heater trim basic options – concept drawing. This drawing is only
a simple schematic guide.
Do not place any water connections overhead the boiler / water heater;
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 DC 33-160) piping for the DC Series Boilers / Water
Heaters. The boiler / water heater 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 / water heater vs. distribution). Aim for a
20° to 30° F Δ°T across the heat exchanger at high fire.
The DC Series modulating boilers / water heaters 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 / water heater.
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 / water heater. 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
INSTALLATION AND OPERATION INSTRUCTIONS
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