For Use With Cooling Units - ECR Dunkirk PWB Series Manual

Figure 4
• Remove sticker from front of gauge. See Figure
4.
Connect Supply and Return Piping to boiler.
4.
Connections may require certain additional fi ttings
and parts, as shown on diagram (Figs. 5 and 6).
Boiler equipped with 1-1/4" supply and return
5.
connections on both left and right sides of boiler.
In connecting cold water supply to water inlet
valve, make sure clean water supply is available.
When water supply is from a well or pump, install
sand strainer at pump.
Hot water boiler installed above radiation level
or as required by Authority having jurisdiction
must be equipped with low water cutoff device
at time of installation. Periodic inspection is
necessary, as is fl ushing of fl oat type devices, per
manufacturer's specifi c instruction.

FOR USE WITH COOLING UNITS

A. This boiler, when used in connection with a
refrigeration system, must be installed so that the
chilled medium is piped in parallel with the heating
boiler. Appropriate valves must be used to prevent
the chilled medium from entering the heating
boiler (Fig. 6).
B. When this boiler is connected to heating coils
located in air handling units where they may be
exposed to refrigerated air circulation, the piping
system shall be equipped with fl ow control valves
or other automatic means to prevent gravity
circulation of the boiler water during the cooling
cycle.
INSTALLATION - SYSTEM PIPING
LOW DESIGN WATER TEMPERATURE SYSTEMS
(BELOW 140° F)
Install 3-way or 4-way mixing valve (or suitable
alternative) to prevent low temperature return water
from entering boiler when used in heating system
designed for low water temperature (below 140°F,
e. g. radiant fl oor heating). Follow mixing valve
manufacturer's installation instructions.
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