Navien NPE-32AWE, Installation Manual

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2 7 Insta ll ing the Water Heater
3 .5 Connecting the Condensate D rain
L ine
The Navien NPE-AWE/NPE- S WE water heaters create
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 water heater. We recommend draining
the condensate into a laundry tub, as the alkali in laundry
detergent will neutrali
z e the acid in the condensate. However,
other suitable waste drain locations may be used according to
the local legislation.
CAUTION
Do not cap or plug the integrated condensate line. If
prevented from draining, condensate can damage the
water heater.
The condensate line must have a negative slope to drain
properly.
The requirements recommended for the condensate drain line
installation are as follows:
For correct condensate drain line installation, the tube must
have a minimum diameter of
Ø 22 mm.
The tube must be made of a material that can withstand
corrosion, e.g. PVC, PCV-U, AB
S , PVC-C or PP. It must not be
made of metal.
For safety reasons, the end of the tube must be as close as
possible to the draining point.
When the condensate drainage is connected to a general
that could occur inside it must be taken into account,
installing suitable pressure release and ventilation elements.
The length of the tubes outside the building must be as short
as possible. They must also be installed with as much tilt as
possible. The tubes must be insulated if they are exposed
to extremely cold weather or bli
zz ards. If the tubes are not
insulated, they must have a diameter of at least Ø 32 mm.
The drain tube must have a minimum tilt of 2.5 ° downstream
of the water heater.
For tubes with Ø 22 mm, the maximum permitted length is
3 metres.
If the appliance is installed in a non-heated premises, the tube
system must be treated as if it was an outdoor installation.
To prevent the risk of tripping, the outdoor tubes must be
Before connecting the condensate drain, choose one of the
following disposal options:
a
b
c
d
a. From the water heater directly into an external drain.
b. From the water heater, through a neutrali z ing agent,
and then into an external drain.
Note
If you choose this option, the neutrali z ing agent
must be replaced periodically. Depletion of the
neutrali
z ing agent will vary, based on the usage
rate of the water heater. During the year of
operation, the neutrali z er should be checked
every few months for depletion and replaced as
needed.
c. From the water heater into a condensate pump and
neutrali
z ing agent
Note
The bottom of the water heater must be higher
than the top of the laundry tub to use this option.
The condensate line must have a negative slope
to drain properly.
d. From the water heater into a condensate pump, and
then into a laundry tub.
Note
A pump can be used when there is a long
distance between the water heater and the
laundry tub or when the bottom of the water
heater is lower than the top of the laundry tub.