4
STEP 3 After Installing
Opening All the Valves
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Gas Valve
Space Heating System Valves
Shut-off
valves
Power ON
Adjust Temperatures
View Basic Information
Resetting the Boiler
Space Heating Temperature
DHW Temperature
1. In normal operation mode, rotate
the Command dial ( ). The space
heating temperature ( ) is
highlighted on the screen.
2. Rotate the Command dial ( ) to
the right to select the DHW
temperature.
3. Press the Command dial ( ) to
select the indirect DHW
temperature ( ). The highlighted
section will flash.
4. Rotate the Command dial ( )
to
the right or left to increase or
decrease the temperature.
5. Press the Command dial ( ) to
confirm the new temperature.
Note
DHW temperature higher
than 180 °F can cause
scalding.
When the power is on, the boiler
automatically enters normal
operation mode, and the boiler’s
operating conditions are diaplayed
on the screen.
1. In normal operation mode, rotate the
Command dial ( ). The space
heating temperature ( ) is
highlighted on the screen.
2. Press the Command dial ( )
to select
the space heating temperature. The
highlighted section will flash.
3. Rotate the Command dial ( )
to the
right or left to increase or decrease
the temperature.
4. Press the Command dial ( )
to
confirm the new temperature.
1. Press the Menu button ( ), and
then select “2. Status
Information”.
2. Rotate the Command dial (
)
to
switch between the information
items.
If an error message appears during
boiler operation, reset the boiler to
resolve the problem. Press the Back
button (
) on the front panel to
reset the 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.
1
Open
Closed
2
Open a hot water
faucet. The boiler
should turn on and
the gas in the gas
supply line will be
purged.
2
3
3
4
Shut off the manual gas valve.
Leave the faucet on until the boiler shuts down
due to a lack of gas supply, and then turn off the
hot water faucet.
Remove the front cover by
loosening the 4 screws.
Loosen the screw indicated in the figure and
connect a manometer to the pressure port.
Reset the manometer to zero before use.
5
Open
Re-open the manual
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
its maximum firing
rate.
6
NG: 3.5”–10.5” WC
LP: 8.0”–13.5” WC
Recommended
Gas Pressure Settings:
Check the inlet gas pressure reading on the manometer.
If not,
Gas supply
Adjust the inlet gas pressure with gas
regulator.
CAUTION
The boiler cannot function properly without sufficient inlet gas pressure.
Measuring the inlet gas pressure should be performed by a licensed professional only.
Navien, Inc.
20 Goodyear, Irvine, CA 92618
Tel: 1-800-519-8794, Fax: 1-949-420-0430
www.navien.com
Installing the Front Cover
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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
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A trial run should be performed in accordance with the Installation checklist listed in
the boiler’s Installation & Operation Manual.
Operating the Boiler
>
Measuring the Inlet Gas Pressure
>
