Navien NFB‑C Series Quick Installation Manual

STEP 1 Before Installing
Read the Installation & Operation Manual before installing.
This product must be installed and serviced by a licensed plumber,
a licensed gas fitter, or a professional service technician. Navien is
not liable for any damages or defects resulting from improper
installation.
WARNING
Follow all local codes and/or the most recent edition of the National Fuel Gas Code (ANSI
Z223.1/NFPA 54) in the USA, or the Natural Gas and Propane Installation Code in Canada
(CAN/CGA B149.1).
Safety
DO NOT install the boiler in areas with excessively high humidity.
STEP 2 Installing
Unpacking

User's
Information
Navien
Manual,
Condensing
Installation
Boiler
& Operation
Manual
Vent
Termination Wall Flanges
Caps
Pressure
Conversion
Relief Valve,
Kit
Heating
Universal
PRV-Air Vent
Temperature
Adapter
Sensor
(with Clip)
(with Clip)
Mounting on the Wall

CAUTION
Do not install the boiler on drywall
without proper reinforcement.
Mount the wall bracket and the boiler following the instructions below for your installation type.
2
Note
The anti-vibration rubber pad must be mounted with its arrow mark (
Mounting to a wood studded wall:
Mount the wall bracket using the lag bolts provided.
Mounting to a concrete wall:
Mount the wall bracket using the anchor bolts provided. To mount the anchor bolts, drill a 3/8"
diameter hole 3-1/2" deep and insert anchor.
Mounting to a metal studded wall:
Mount the wall bracket using field supplied toggle bolts capable of supporting 100 pounds each.
Quick Installation Guide
Condensate
Air Vent
Trap
Wall Mounting
Bracket (with Tapping
Anti-Vibration Screws and
Rubber Pad) Anchors
* Included in (x6)
the L box
Air Vent
Outdoor
Bushing
Temperature
1
(1 /
Sensor and
2
3
Cable
in to / in)
4
Double
Nipple
Caps (x2)
3
( /
4
3
in to / in)
4
>
Remove the wall bracket from the L box.
1
) facing outward.
Location Requirements
Select the best location on "Choosing an Installation Location" in the Installation &
Operation Manual.
Allowable minimum clearances
Top
Back
Side
Side
Front
Bottom
Checking the Rating Plate

2017
This appliance is certi ed for use at altitudes up to 4,500 ft (1,370 m) In accordance to the latest CAN/CGA 2.17-High Altitude
Installation procedures at normal manifold pressure. This appliance has also been tested up to 10,100 ft(3,078 m).
For installations at altitudes up to 10,100 ft(3,078 m), follow the directions provided in the High Altitude Installations sections
of the lnstallatlon Manual. *Cet appareil est certi é pour une utilisation à des altitudes de 0 à 4,500 pieds (1,370 m) conformément aux
toutes les procédures d'installation à haute altitude CAN/CGA 2.17 à une pression normale. Cet appareil a été testé jusqu'à 10,100 pieds
(3.078 m). Pour les instructions d'installation à une altitude supérieure à 10.100 pieds, suivez les instructions fournies dans la section des
installations à haute altitude du manuel d'installation.
WARNING
· Before connecting the gas supply, determine the gas type and pressure for the boiler by
referring to the rating plate. Use only the same gas type indicated on the rating plate. Using a
different gas type will result in abnormal combustion and malfunction of the boiler. Gas
supplies should be connected by a licensed professional only.
· The appliance and its gas connection must be leak tested before placing the appliance in
operation.
· This boiler cannot be converted from natural gas to propane or vice versa without a Navien gas
conversion kit. Do not attempt a field conversion of this boiler without a Navien gas conversion
kit. Doing so will result in dangerous operating conditions and will void the warranty.
Navien Inc. is not liable for any property damage and/or personal injury resulting from
improper conversions.
Removing the Front Cover

Unfasten the 4 latches
(2 at the top and 2 at the bottom)
to remove the front cover.
1
Model
NFB-301C/399C
Clearance from: Indoor Installation
Top 12 in (305 mm) minimum
Back 0.5 in (13 mm) minimum
Front 24 in (610 mm) minimum
Sides 6 in (152 mm) minimum
Bottom 24 in (610 mm) minimum
This boiler is configured
for Natural Gas from the
factory. If conversion to
7
Propane Gas in required,
the conversion kit supplied
with the boiler must be
used.
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