Navien NFC-250/175H, Руководство по установке, Страница: 20 / 151

20 Installing the System Piping
Prior to connecting piping to the boiler, flush the
entire system to ensure it is free of sediment, flux,
solder, scale, debris or other impurities that may
be harmful to the system and boiler. During the
assembly of the heating system, it is important
to keep the inside of the piping free of any debris
including construction dust, copper burr, sand and
dirt.
For retrofits, all system piping including radiators,
must be cleaned of all build-up including sludge
and scale. All systems, old and new, must be
cleaned to remove flux, grease and carbon residue.
Navien recommends cleaning the boiler system
with cleaning products specially formulated
for boiler systems. For retrofit applications with
heavy limescale and sludge deposits, a heavier
duty cleaner may be required. For information on
performing the cleaning, follow the instructions
included with the boiler system cleaner products.
WARNING
Failure to rid the heating system of the
contaminants listed above will void your
warranty and may result in premature heat
exchanger failure and property damage.
3.1 Installing a Space Heating
System
The fire-tube type heat exchanger of the Navien
NFC-H boiler is designed to attain the highest level
of heat transfer in a compact design. To accomplish
this, the heated gas flows through a series of small-
diameter tubes, maximizing the heat transfer area.
To maintain the efficient and reliable operation of
the heat exchanger, and to avoid heat exchanger
failure, it is critical to ensure the rules and guidelines
in this section are followed.
WARNING
●
To avoid damaging the connectors on the
boiler, use two wrenches when tightening
pipings to the boiler. Use one wrench to
prevent the connector at the boiler from
turning, and use the other wrench to tighten
the connection. Damaged connectors may
result in system leaks.
●
Properly support the pipings with hangers.
Do not allow the pipings to be supported by
the boiler or its accessories.
CAUTION
Failure to follow the instructions provided in this
section will void the warranty and may result in
property damage, fire, serious injury or death.
3. Installing the System Piping