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22 Installing the System Piping
The installation must be made by sufficiently qualified
technicians, authorised to do so. For correct installation, all
the requirements and recommendations described in the
Regulation for Heating Installations in Buildings (RITE) must
be complied with, together with all other national and/or local
regulations applicable at the time of installation. However, the
following recommendations must be complied with:
Before connecting the boiler hydraulically, the inside of the
pipes must be thoroughly cleaned, removing all sediment of
any type which could cause oxidation or damage to the heat
exchanger.
It is recommended to fit shut-off valves to the heating
installation output and return pipes, to avoid having to drain
the installation when maintenance work is carried out on the
boiler.
Bleed the air from the boiler and heating installation. Ensure
there is no air in the heating circuit.
The NCB LDWE boiler is a condensing boiler, and it is
therefore essential for the condensate outlet to lead to a
drain, in compliance with all applicable national and/or local
regulations to this respect.
The boiler drain must not be located above a window, entry
door or other public point of access. Bear in mind that boiling
water or steam could come out when draining.
Draining must be done in a downward direction and towards
the walls.
WARNING
Ɣ
Tighten the boiler water connections, taking care not
to da
m
age the
m
. Do not force the tube connections
excessively, as this could da
m
age the connections and
cause leaks.
Ɣ
Any dirt in the tubes could reduce boiler efficiency and
cause it to
m
alfunction.
Ɣ
Any pipes exposed to the ele
m
ents or which could freeze
in winter
m
ust be insulated with suitable insulating
m
aterial.
CAUTION
Failure to follow the instructions provided in this section will
void the warranty and
m
ay result in property da
m
age, fire
or serious injury.
4. Installing the System Piping
4.1 Installing a Space Heating System
The primary and secondary heat exchangers of the Navien
NCB LDWE boiler 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 maximise 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.
CAUTION
Ɣ
The installation
m
ust be
m
ade by sufficiently
q
ualified
technicians, authorised to do so.
Ɣ
For correct installation, all the re
q
uire
m
ents and
reco
mm
endations described in the Regulation for
Heating
I
nstallations in Buildings (R
I
TE)
m
ust be
co
m
plied with, together with all other national and/or
local regulations applicable at the ti
m
e of installation.
Refer to the following illustration for a typical DHW piping
exa
m
ple for the boiler.
Union
CH Flow
CH Return
Botto
m
View
Floor Heating Circuit or
Heating Circuit (Radiator)
Heating Supply
Adapter
Heating Return
Adapter
When connecting the space heating syste
m
, follow these
guidelines:
Ɣ
Tighten the connection valves with care to avoid da
m
age.
Ɣ
Test the boiler for proper space heating flow and inspect for
leaks.
Summary of Contents for NCB-24LDWE
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