Dunkirk Q90-200 Series II - Manual (Page 8)

8
General Instructions
1.
Packaged boiler is furnished with iron piping in front
boiler section for supply and return connections.
2.
Install all of radiation units (panels, radiators,
baseboard, or tubing) and supply and return mains
first, when installation of boiler is for new heating
system.
3.
After installation of all heating system piping and
components; make final connection of system piping to
boiler.
4.
Hot water boiler installed above radiation level or
as required by authority having jurisdiction must be
equipped with low water cut off device (included with
boiler).
5.
Periodic inspection is necessary, as is flushing of float
type devices, per low water cut off manufacturers
specific instructions.
6.
Proper water flow through any boiler is essential to
proper operation and long life. Simple single or two
zone systems with adequate flow do not require
primary secondary piping. Systems with more zones or
low flow require primary secondary piping.
4 - NEAR BOILER PIPING
Dielectric Isolation
1.
Two (2) 1-1/4” X 1-1/4” female to female dielectric
isolation unions are supplied. Install dielectric isolation
unions at boiler supply line and return line. Install
isolation fittings nearest boiler prior to system piping
connections.
2.
Water contaminants that cause low or high pH makes
corrosion more likely.
3.
Do not install copper supply and return piping directly
into aluminum boiler section castings due to galvanic
corrosion between dissimilar metals.
4.
Use iron, steel bushings or pipe connectors between
copper system piping and boiler to make final
connection to boiler.
5.
Use of dielectric unions is required, supplied with boiler,
the purpose is to electrically insulate aluminum boiler
from remainder of the system.
Figure 2 - General Primary Secondary Configuration