Navien NFC-200 Quick Installation Manual page 4

STEP 3 After Installing
Opening All the Valves

Gas Valve
Operating the Boiler

Power ON Adjust Temperatures
Space Heating Temperature
To turn the boiler on, press the 1. In normal operation mode, rotate the
Power button.
When the power is on, the boiler
automatically enters normal
2. Press the Command dial ( ) to select
operation mode, and the boiler's
operating conditions are displayed
on the screen.
3. Rotate the Command dial ( ) to the
4. Press the Command dial ( ) to
5. Press the Back button (
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
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.
Command dial ( ). The space
4. Rotate the Command dial ( ) to
heating temperature ( ) is
the right or left to increase or
highlighted on the screen.
decrease the temperature.
5. Press the Command dial ( ) to
the space heating temperature. The
confirm the new temperature.
highlighted section will flash.
6. Press the Back button (
return to normal operation mode,
right or left to increase or decrease
or rotate the Command dial ( )
the temperature.
to adjust other operation
conditions.
confirm the new temperature.
Note
) to return
to normal operation mode, or rotate
the Command dial ( ) to adjust
other operation conditions.
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.
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
View Basic Information
1. Press the Menu button ( ), and
then select "2. Status
Information".
2. Rotate the Command dial (
switch between the information
items.
) to
DHW temperature higher
than 180°F can cause
scalding.
3
Remove the front cover by
loosening the 4 screws.
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
Resetting the Boiler
If an error message appears during
boiler operation, reset the boiler to
resolve the problem. Press the Back
button ( ) on the front panel to
)
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.
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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