4
STEP 3 After Installing
Opening All the Valves
>
Gas Valve
Space Heating System Valves
DHW System Valves
Shut-off
valves
Shut-off valves
Power ON
Adjust Temperatures
View Basic Information
Resetting the Boiler
MOD
E
Space
H
eating Temperature
MOD
E
D
H
W Temperature
1. Make sure that all hot water faucets
are closed, and ensure that the
internal circulator and any external
circulating pumps are off.
2. Press the Mode button twice. The
D
H
W mode icon turns on.
3. Press + (Up) or – (Down) buttons
until the desired temperature
appears on the display.
Note
D
H
W temperature higher
than 125°F can cause
scalding.
MOD
E
MOD
E
When the power is on, the water
temperature of the space heating
supply will appear with the water
pressure on the front panel display
in 5 second intervals.
1. Press the Mode button once. The
space heating icon turns on.
2. Press the + (Up) or – (Down)
buttons until the desired
temperature appears on the
display.
1. Press the Mode button three
times. “INFO” will appear on the
display.
2. Press the + or – buttons to
switch between the information
types.
If an error message appears, you can
try resetting the boiler to resolve the
problem.
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.
1
1
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
Открыть
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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1
2
2
Ensure Maximum Water Flow
>
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.
Operating the Boiler
>
Measuring the Inlet Gas Pressure
>
