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Unpacking
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Navien Combination
Boiler
User’s Information
Manual, Installation
& Operation Manual
Wall mounting
bracket
Tapping screws and
anchors
2 in Vent Termination
Caps (x2)
2 in Wall Flanges (x4)
Propane Gas &
High Altitude
Conversion Kit
NG High Altitude
Conversion Kit
(Natural Gas Only)*
Spare Parts
Pressure Relief Valve,
Heating
Outdoor
Temperature Sensor
and Cable
Model
NCB-250/150H, 240/130H, 240/110H,
190/080H, 190/060H
Quick Installation Guide
STEP 2 Installing
Checking the Rating Plate
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This boiler is congured for Natural Gas from the factory. If conversion to Propane Gas in required, the
conversion kit supplied with the boiler must be used.
Mounting on the Wall
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NOTICE
The mounting bracket has 16 inch on center holes for installation on standard wall studs. If the
strength of the wall is insucient or if the framing is non-standard or uneven, reinforce the area
before installing the boiler to prevent property damage.
Drill holes into studs and drill holes into drywall for
plastic anchors. Insert plastic anchors into drywall.
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Secure one screw to hold Wall Mounting
Bracket. Check bracket is level then
secure the remaining three screws.
With assistance from another person, lift the boiler
slightly above the hooks on the Wall Mounting
Bracket. Slowly lower until the boiler is resting on
the Wall Mounting Bracket hooks.
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Removing the Front Cover
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Unfasten the 4 latches
(2 at the top and 2 at the
bottom) to remove the front
cover and gain access to the
internal components.
STEP 1 Before Installing
Read the Installation and Operation Manual before installing.
This product must be installed and serviced by a licensed plumber,
a licensed gas tter, 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).
Note
Installer must verify that at least one carbon monoxide detector is installed within the residential
living space before placing the boiler into operation. Refer to the manufacturer's instructions and
local codes as well as the Consumer Product Safety Commission (CPSC) and Environmental
Protection Agency (EPA) recommendations for proper use of carbon monoxide alarms.
Safety
Boilers come from the factory congured for use with Natural Gas (NG). If conversion to Propane Gas is
required, the included Propane Gas & High Altitude Conversion kit must ALWAYS be used. Refer to the
Propane Gas & High Altitude Conversion Guide for more information.
To prevent death, serious injury or property damage:
Before starting the installation, check the Rating Plate located on the side of the boiler to ensure that
the boiler matches the gas type, gas pressure, water pressure, and electrical supply available in the
installation location.
If the boiler does not match each of these ratings, do not install the boiler. Using a dierent gas
type will result in abnormal combustion and malfunction of the boiler.
· ONLY a licensed professional should connect the gas supply.
· ALWAYS leak test the appliance and the gas connections before operating the appliance.
· This boiler cannot be converted from natural gas to propane without a Navien Propane Gas & High
Altitude Conversion kit. NEVER attempt a eld conversion of this boiler without using the Navien
Propane Gas & High Altitude Conversion kit. Doing so will result in dangerous operating conditions
and will void the warranty.
Navien Inc. is not liable for any property damage, personal injury or death resulting from
improper conversions
Location Requirements
Note
DO NOT install in locations with very high humidity. Refer to "Choosing an
Installation Location" in the Installation and Operation Manual.
Installation Clearances
Top
Back
Side
Side
Front
Bottom
Clearance 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
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