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STEP 3 After Installing
Opening All the Valves
Gas Valve
Closed Open
Operating the Boiler
Power ON
To turn the boiler on:
1. Connect the power cord. When the
power is on, the User Settings
screen is displayed.
2. Select the language you want to use
and set the vent type, current date,
and time by tapping your selections
on the screen.
3. Tap Done on the top right of the
screen to complete the settings.
Measuring the Inlet Gas Pressure
1
Open
Closed
Shut off the manual gas valve.
Re-open the manual
5
gas valve and check
for leaks.
Open multiple
fixtures that have
high flow rates, such
as bathtub and
shower faucets, to
ramp the boiler up to
Open
its maximum firing
rate.
CAUTION
The boiler cannot function properly without sufficient inlet gas pressure. Measuring the inlet gas pressure should be performed by a licensed professional only.
Installing the Front Cover
Space Heating System Valves
Shut-off
valves
Turn On or Off
Space Heating
DHW
To turn the Space
To turn the DHW on or
off, tap DHW ON on the
Heating on or off,
tap SH ON on the top
top right of the screen.
left of the screen.
2
Open a hot water
faucet. The boiler
should turn on and
the gas in the gas
supply line will be
purged.
Leave the faucet on until the boiler shuts down
due to a lack of gas supply, and then turn off the
hot water faucet.
<NFB-301C>
6
Check the inlet gas pressure reading on the manometer.
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Navien, Inc.
20 Goodyear, Irvine, CA 92618
Tel: 1-800-519-8794, Fax: 1-949-420-0430
www.navien.com
Adjust Temperatures
Space Heating
DHW Temperature
Temperature
To adjust the heating
To adjust the heating
temperature on the
temperature on the
screen, tap (
) or (
)
screen, tap (
) or (
to select the space
select the DHW Indirect
heating temperature in
Supply temperature in
the SH Set Temp menu.
the DHW Set Temp
The current temperature
menu. The current
setting is displayed in
temperature setting is
the menu.
displayed in the menu.
3
Unfasten the 4 latches (2 at the
top and 2 at the bottom) to
remove the front cover.
<NFB-399C>
Recommended
Gas Pressure Settings:
NG: 3.5"–10.5" WC
LP: 8.0"–13.5" WC
Ensure Maximum Water Flow
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After running the boiler for the first 10 minutes, turn it off and clean the cold water filter
and the space heating return strainer to remove any trapped debris.
Final Check
A trial run should be performed in accordance with the Installation checklist listed in
the boiler's Installation & Operation Manual.
4
View Basic Information
Resetting the Boiler
1. To view information
If an error message
about the boiler, tap
appears during boiler
)
the Control button
operation, reset the
( ) > Status on the
boiler to resolve the
screen.
problem. Press and hold
the Reset button on the
2. Tap an item to view
front panel to reset the
the information.
boiler.
Note
If resetting does not solve the problem,
refer to the troubleshooting section of
the User's Information Manual or contact
the service center.
<NFB-301C>
<NFB-399C>
4
Loosen the screw indicated in the figure and connect a
manometer to the pressure port. Reset the manometer to zero
before use.
If not,
Gas supply
Adjust the inlet gas pressure with gas
regulator.
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