Near Boiler Piping - Dunkirk 90-50 Installation, Operation & Maintenance Manual

When the installation of the boiler is for a new heating system, first
install all of the radiation units (panels, radiators, baseboard, or tub-
ing) and the supply and return mains. After all heating system piping
and components have been installed, make final connection of the
system piping to the boiler. A hot water boiler installed above radia-
tion level, or as required by the Authority having jurisdiction, must
be equipped with a low water cut off device. A periodic inspection
is necessary for flushing of float type devices, per low water cut off
manufacturers specific instructions.
supply and return lines
The packaged boiler unit is set up to receive 1 ¼" NPT supply and
return piping from top access. The boiler unit can also be piped from
the left side by turning the supply elbow, and from the rear of the
unit by removing plugs in the rear boiler section.
figure 2 - single Zone boiler piping

near boiler piping

The circulator pump and isolation valves are
furnished within a carton inside the boiler
cabinet and can be installed at the installer
preferred location.
copper supply and return piping must NOT be
installed directly into aluminum boiler section
casings due to galvanic corrosion between
dissimilar metals. Iron or steel bushings or
!
pipe nipples should be used between copper
system piping and boiler to make final
connection to boiler. Also, the use of dielectric
unions is acceptable. The packaged boiler is
furnished with iron piping in the front boiler
section for the supply and return connections.
12
NOTICE
CAUTION