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STEP 3 After Installing
Opening All the Valves
Gas Valve
Closed
Open
Operating the Boiler
Power ON
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.
Measuring the Inlet Gas Pressure
Open
Closed
Shut off the manual gas
valve.
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.
Open
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
Adjust Temperatures
DHW Temperature
Space Heating 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
1. Press the Mode button
icon turns on.
once. The space heating
icon turns on.
3. Press + (Up) or – (Down)
buttons until the desired
2. Press the + (Up) or – (Down)
temperature appears on
buttons until the desired
the display.
temperature appears on
the display.
Note
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.
Check the inlet gas pressure reading on the manometer.
DHW System Valves
Shut-off valves
View Basic Information
1. Press the Mode button three
times. "INFO" will appear on
the display.
2. Press the + or – buttons to
switch between the
information types.
DHW temperature
higher than 125°F can
cause scalding.
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
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
Navien America, Inc.
20 Goodyear, Irvine, CA 92618
Tel: (949) 420-0420, Fax: (949) 420-0430
www.navienamerica.com
Resetting the Boiler
If an error message appears, you
can try resetting the boiler to
resolve the problem.
If resetting does not solve
Note
the problem, refer to the
troubleshooting section of
the User's Information
Manual or contact the
service center.
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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