Navien NFB Series Installation & Operation Manual page 15

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 24.
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 the Boiler" on page 51.
To ensure adequate venting and ventilation, follow these
guidelines:
Maintain proper clearances from any openings in the building.
●
Install the boiler with a minimum clearance of 12 in (300 mm)
●
above the level required by local codes and weather conditions.
Maintain a minimum clearance of 4 ft (1.2 m) from heating and
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cooling vents.
Do not enclose the vent termination.
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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
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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.
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
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
Side
Front
Bottom
Installing the Boiler 15