Navien NFB-175H, Installation Manual, Page: 15 / 135

15 Installing the Boiler
Adequate Installation Clearances
CAUTION
Do not install the boiler on carpeting.
Install the boiler in an area that allows for service
and maintenance access to utility connections,
piping, filters, and traps. Based on the installation
location, ensure that the following clearances are
maintained:
Top
Back
Side
Bottom
Front
Side
Clearance from: Indoor Installation
Top 9 in (229 mm) minimum
Back 0.5 in (13 mm) minimum
Front 4 in (100 mm) minimum
Sides 3 in (76 mm) minimum
Bottom 12 in (300 mm) minimum
Adequate Drainage
The boiler produces a significant amount of
condensate during operation. The boiler should be
located near a suitable drain and where damage
from a possible leak will be minimal. Installing the
boiler in a location without a drain will void the
warranty and Navien will not be responsible for
water damages that occur as a result. For more
information about condensate drainage, refer to “3.2
Connecting the Condensate Drain” on page 25.
The boiler must be located in an area where leakage
of the unit or connections will not result in damage
to the area adjacent to the appliance or to lower
floors of the structure. When such locations cannot
be found, installation of an adequately drained drain
pan under the boiler is highly recommended. When
installing the drain pan, ensure that the installation
does not restrict combustion air flow.
Adequate Venting and Ventilation
Select a location that requires minimal venting.
Consider venting restrictions caused by windows,
doors, air intakes, gas meters, foliage, and other
buildings. For more information about venting, refer
to “5. Venting for Combustion Air” on page 54.
To ensure adequate venting and ventilation, follow
these guidelines:
●
Maintain proper clearances from any openings in
the building.
●
Ensure that the vent termination is at least 12 in
(300 mm) above ground, 12 in (300 mm) above
the highest anticipated snow level, or as required
by local codes, whichever is greater.
●
Do not enclose the vent termination.
●
Install the exhaust vent in an area that is free
from any obstructions, where the exhaust will not
accumulate.
●
Do not install the boiler where moisture from the
exhaust may discolor or damage walls.
●
Do not install the boiler in bathrooms, bedrooms,
or any other occupied rooms that are normally
kept closed or not adequately ventilated.