Installing the System Piping 23
4.2 Installing a Domestic Hot Water
(DHW) System
The Navien NCB LDWE boiler provides domestic hot water
continuously when flow is sensed by the flow sensor. This
method is the most efficient means of heating water by allowing
the boiler to operate at a lower return water temperature
by minimizing standby losses, thus increasing combustion
efficiency.
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.
Condensate
Drain Hose
Cold Water
Supply
Condensate Pipe
Hot Water Supply
Bottom View
DHW Outlet
Adapter
Condensate
Outlet
Water Inlet
Adapter
When installing the DHW system, follow these guidelines:
Use only pipes, fittings, valves, and other components (such
as solder), that are approved for use in potable water systems.
Tighten the connection valves with care to avoid damage.
Keep the hot water piping system as short as possible, to
deliver hot water to the fixtures more quickly.
After installing the boiler, clean the cold water inlet filter.
Then, test the boiler for proper DHW supply and inspect for
leaks.
4.3 Connecting the Condensate Drain
Line
The Navien NCB LDWE boiler creates condensation when it
operates. This condensation has an acidic pH of 3-5. Follow
all local codes and regulations when disposing of condensate
from the boiler. We recommend draining the condensate into
a laundry tub, as the alkali in laundry detergent will neutralise
the acid in the condensate. However, other suitable waste drain
locations may be used according to the local legislation.
CAUTION
Ɣ
Do not cap or plug the integrated condensate line.
I
f
prevented fro
m
draining, condensate can da
m
age the
boiler.
Ɣ
The condensate line
m
ust have a negative slope to drain
properly.
The re
q
uire
m
ents reco
mm
ended for the condensate drain line
installation are as follows:
Ɣ
For correct condensate drain line installation, the tube
m
ust
have a
m
ini
m
u
m
dia
m
eter of Ø22
mm
.
Ɣ
The tube
m
ust be
m
ade of a
m
aterial that can withstand
corrosion, e.g. PVC, PVC-U, ABS, PVC-C or PP.
I
t
m
ust not be
m
ade of
m
etal.
Ɣ
For safety reasons, the end of the tube
m
ust be as close as
possible to the draining point.
Ɣ
When the condensate drainage is connected to a general
drain network inside the building, the effects of overpressure
that could occur inside it
m
ust be taken into account,
installing suitable pressure release and ventilation ele
m
ents.
Ɣ
The length of the tubes outside the building
m
ust be as short
as possible. They
m
ust also be installed with as
m
uch tilt as
possible. The tubes
m
ust be insulated if they are exposed
to extre
m
ly cold weather or blizzards.
I
f the tubes are not
insulated, they
m
ust have a dia
m
eter of at least Ø32
mm
.
Ɣ
The drain tube
m
ust have a
m
ini
m
u
m
tilt of 2.5° downstrea
m
of the boiler.
Ɣ
For tubes with Ø22
mm
, the
m
axi
m
u
m
per
m
itted length is
3
m
etres.
Ɣ
I
f the appliance is installed in a non-heated pre
m
ises, the tube
syste
m
m
ust be treated as if it was an outdoor installation.
Ɣ
To prevent the risk of tripping, the outdoor tubes
m
ust be
fixed to the walls.
Summary of Contents for NCB-24LDWE
Page 65: ...Appendices 65 12 4 Ladder Diagram 3 15A...
Page 69: ...Memo...
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