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3. 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.
NOTICE
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.
To avoid damaging the connectors on the
●
boiler, use two wrenches when tightening
piping 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 piping with hangers. Do
●
not allow the piping to be supported by the
boiler or its accessories.
3.1 Installing a Space Heating
System
The primary and secondary heat exchangers of the
Navien NHB-H boilers are designed to attain the
highest level of heat transfer in a compact design.
To accomplish this, the heating water flows through
a series of tubes (secondary heat exchanger) and
finned tubes (primary heat exchanger), designed
to maximize the heat transfer area. To maintain
the efficient and reliable operation of the heat
exchangers, and to avoid heat exchanger failure, it
is critical to ensure the rules and guidelines in this
section are followed.
16
Installing the System Piping
WARNING
Failure to follow the instructions provided in this
section will void the warranty and may result in
property damage, fire, serious injury or death.
3.1.1 Guidelines for a Space Heating
Installation
Read and follow the guidelines listed below to
ensure safe and proper installation of a boiler
heating system.
Freeze Protection for a Space Heating
System
Freeze protection products may be used for the
●
space heating system. Freeze protection for new
or existing systems requires specially formulated
glycol, which contains inhibitors to prevent
the glycol from attacking the metallic system
components.
Before using freeze protection products,
●
ensure that system fluid contains proper
glycol concentration and the inhibitor level
is appropriate. Navien recommends against
exceeding a 35% concentration of glycol.
When using the freeze protection products, the
●
system must be tested at least once a year, and as
recommended by the manufacturer of the glycol
solution.
When using the freeze protection products,
●
allowance should be made for expansion of the
glycol solution.
Freeze damage is not covered by the warranty.
●
The use of glycol results in a greater head loss due
●
to its higher viscosity compared to water.
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