4
STEP 3 After Installing
Opening All the Valves
Operating the Boiler
Measuring the Inlet Gas Pressure
Installing the Front Cover
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.
Shut off the manual gas
valve.
Open
Closed
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.
Open
Check the inlet gas pressure reading on the manometer.
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.
Adjust the inlet gas pressure with
gas regulator.
Gas supply
If not,
NG : 3.5
”
~10.5
”
WC
LP : 8.0
”
~13.5
”
WC
Recommended Gas Pressure Settings:
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.
CAUTION
The boiler cannot function properly without sufficient inlet gas pressure.
Measuring the inlet gas pressure should be performed by a licensed professional only.
Power ON
Adjust Temperatures
View Basic Information
Resetting the Boiler
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 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
Space Heating Temperature
DHW 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 DHW mode
icon turns on.
3.
Press + (Up) or – (Down)
buttons until the desired
temperature appears on
the display.
Note
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.
DHW temperature
higher than 125
°
F can
cause scalding.
If resetting does not solve
the problem, refer to the
troubleshooting section of
the User’s Information
Manual or contact the
service center.
Closed
Shut-off valves
Navien America, Inc.
20 Goodyear, Irvine, CA 92618
Tel: (949) 420-0420, Fax: (949) 420-0430
www.navienamerica.com
Gas Valve
Open
Space Heating System Valves
DHW System Valves
Shut-off valves
