Venting For Combustion Air; Additional Guidelines For Combustion Air; Maintenance - Navien NPE-180A2 Installation Manual

Ensure that the condensate runs freely to the
●
drain.
Ensure all connections are made to prevent
●
the backflow of condensate. Use corrosion
resistant piping and secure all piping to prevent
movement.
Do not install condensate piping in
Note
areas where the temperature drops
below freezing point. Protect piping in
high pedestrian areas from damage and
vibration.
For increased safety when the condensate drain
●
blocks, install a Y-fitting. Connect the Y-fitting as
shown in the installation diagram and ensure that
the condensate runs freely to the drain.
Ensure that the discharge connection is
●
accessible. Access to the discharge connection is
required for maintenance and pH testing.
If there is insufficient gradient for drainage, install
●
a drainage pump designed for water heater and
boiler condensate removal.

Maintenance

Periodically monitor the level of media in the
neutralizer and test the pH level at the outlet. We
recommend an annual pH test using recognized
test strips or an electronic pH meter to obtain
precise measurements. Replace the neutralizing
media when the pH drops below the minimum
level required by the local water authority. If the pH
level is not specified, replace the neutralizing media
when the pH is below 6.0. For replacement media,
contact your local Navien distributor.
40 Installing the Water Heater

3.6 Venting for Combustion Air

Additional Guidelines for Combustion
Air
Combustion air piping to the outside is
●
recommended. (Direct Venting)
The water heater may be installed with a single
●
pipe carrying the flue products to the outside
while using combustion air from the equipment
room. In order to use the room air venting
option on page 45, specific conditions and
considerations must be followed.
WARNING
Do not install the water heater or combustion
●
air piping in areas with contaminated
air(containing a high level of dust, sawdust,
sand, flour, aerosols, fluorine or chlorine
compounds), as contaminants can cause
severe problems.
Pool and laundry products and common
●
household cleaning
contain corrosive compounds. If any of
the chemicals or vapors enter the water
heater, this can result in serious product
damage that can even cause the potential
for flue gas leakage in extreme cases.
To prevent the potential of severe personal
injury or death, check for areas and products
listed in the following tables before installing
the water heater or air inlet piping. If
contaminants are found in the combustion
air, you MUST Remove contaminants
permanently or Relocate air inlet and vent
terminations to other clean areas.
The warranty does not cover damage caused
●
by air contaminants.
If you must install the water heater in an area
●
with contaminated air, use direct venting to
supply clean air from outside the building.
We recommend regular filter cleaning and
maintenance in these areas.
products can