Navien NCB-180 Guide

.VR111,1142.1
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Condensing Combi Boiler
User's
Information
Manual
Model
NCB-180/210/240
riavlem
LA, NOx
emissions
complies with SCAQMD rule 1146.2
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AM CERTIFIED.
www.aerleirectory.orr,
ENERGY STAR
Keep this manual near this boiler for future reference whenever
maintenance or service is required.
* The wetted surface of this product contacted by
consumable water contains less than one quarter of one
percent(0.25%) of lead by weight.
WARNING
If the information in these instructions is not followed exactly, a fire or explosion may result, causing
property damage, personal injury or death.
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any
other appliance.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.
Installation and service must be performed by a qualified installer, service agency or the gas
supplier.
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4. Maintaining the Boiler
4.1 Cleaning the Boiler
0 CAUTION
Make sure the boiler is turned off and the power supply is
disconnected before cleaning the boiler. The boiler may
remain hot for several minutes after it is turned off. To prevent
burns, wait until the boiler has cooled down before cleaning.
To clean the boiler, wipe the outside with a damp cloth. Use a non-
acidic, non-abrasive cleaner to remove any surface stains. The front
panel is moisture resistant, but it is not waterproof. Keep it as dry
as possible.
4.2 Draining the Boiler
You will need to drain either both the space heating side
and domestic hot water (DHW) side, or one side only before
performing maintenance tasks, such as cleaning the inlet water
filter, or to prevent the boiler from freezing when it will not be used
for an extended period.
Refer to the"2.2 Parts of the Boiler" on page 6 for details
about part locations.
To drain the boiler:
1. Place a bucket under the boiler, to collect the residual water
inside the boiler.
2. Press the Power button on the front panel to turn off the boiler.
3. Close the gas valve.
4. Close the water supply valve on the inlet to the boiler. If there
is no valve, turn off the water supply at the water main.
12 Maintaining the Boiler

Cold Water
Inlet Filter
Stra ner
5. Close off any heating zones that do not require draining and
open a purge valve to drain the space heating side. Open all
domestic hot water faucets completely to drain the water
heating side. The water that remains in the plumbing lines will
drain out.
4.3 Cleaning the Inlet Water Filter (DHW
side)
To clean the filter:
Pump Drain Plug
6. Remove the strainer from the bottom of the boiler.
7. Open the pump drain plug.
8. Remove the cold water inlet filter.
9. Allow the residual water to drain from the boiler.
10. When the water is completely drained, reinsert the cold water
inlet filter and close the pump drain plug.
11. To refill the boiler follow the steps of"Draining the Boiler" in
reverse.
1. Drain the DHW side of the boiler. Refer to"4.2 Draining the
Boiler"on page 12.
2. While the filter is removed, rinse it with clean running water
(cold) and, if necessary, scrub it clean with a brush.
3. Reinsert and tighten the filter.
4. Fill the boiler and check for proper operation.
Maintaining the Boiler 13

2. Remove the clip and then remove the strainer.
3. While the strainer is removed, rinse it with clean running water
(cold).
2. Disconnect the power supply to the boiler.
4.4 Cleaning the Strainer (Space Heating
side)
If the heating performance is decreased, you can increase the
heating performance by filtering impurities from the system.
To clean the strainer:
4.5 Cleaning the Air Intake Filter
If the air intake filter becomes clogged by dust or lint, the boiler
will cease to operate and "Error Code 110"will appear on the front
panel display. To properly maintain the boiler, you should clean the
air intake filter every 3-4 months.
To clean the air intake filter:
1. Drain the space heating side of the boiler. Refer to"4.2
Draining the Boiler"on page 12.
1. Press the Power button on the front panel to turn off the boiler.
3. Remove the front cover of the boiler.
4.
Reinsert and tighten the strainer.
5. Fill the boiler and check for proper operation.
14 Maintaining the Boiler

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4. Remove the screw that secures the air intake filter (the filter is
located at the top left of the boiler).
5. Pull the filter out of the boiler.
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6. Remove the filter from the plastic assembly and clean it with a
toothbrush and clean running water.
7. Allow the filter to dry completely.
8. Reinsert the filter into the plastic assembly.
9. Place the filter assembly back into the boiler and secure it with
the screw.
10. Replace the front cover.
11. Reconnect the power supply to the boiler.
12. Press the Power button on the front panel to turn on the boiler.
Maintaining the Boiler 15

4.7 Maintenance Schedules
Owner maintenance
Daily
• Check boiler area
• Check pressure / temperature gauge
Monthly
• Check vent piping
• Check air piping (if installed)
• Check air and vent termination screens
• Check relief valve
• Check condensate drain
• Check air vents
Periodically
• Test low water cutoff (if used)
• Reset button (low water cutoff)
Every 6 months
• Check boiler piping (gas and water) for
leaks
• Operate relief valve
End of season
months
• Shut boiler down (unless boiler is used
for domestic hot water)
Service technician (See the following instructions)
General:
• Address reported problems
• Inspect interior; clean and vacuum if
necessary
• Clean condensate trap and fill with
fresh water
• Check for leaks (water, gas, flue,
condensate)
• Verify flue and air lines in good
condition and sealed tight
• Check system water pressure/system
piping/expansion tank
• Check control settings
Annual Start-up
. Check ignition and flame rod (clean and
reposition)
• Check wiring and connections
• Flame inspection (stable, uniform)
• Flame signal
If combustion or performance indicate
need:
• Flush heat exchanger
• Remove and clean air intake filter.
• Remove and clean space heating
strainer.
• Remove and clean inlet water filter.
4 L • WARNING
• Follow the service and maintenance procedures given
throughout this manual and in component literature
shipped with the boiler. Failure to perform the service and
maintenance could result in damage to the boiler or system.
• Failure to follow the directions in this manual and
component literature could result in severe personal injury,
death, or substantial property damage.
• The boiler should be inspected annually only by a qualified
service technician. In addition, the maintenance and care
of the boiler must be performed to assure maximum boiler
efficiency and reliability. Failure to service and maintain the
boiler and system could result in equipment failure.
• Electrical shock hazard — Turn off power to the boiler
before any service operation on the boiler except as noted
otherwise in this instruction manual. Failure to turn off
electrical power could result in electrical shock, causing
severe personal injury or death.
Addressing the Reported Problems
• Inspect any problems reported by the owner and correct before
proceeding.
Inspecting the Installation Area
1. Verify that boiler area is free of any combustible materials,
gasoline and other flammable vapors and liquids.
2. Verify that air intake area is free of any of the contaminants
listed in Installation & Operation Manual. If any of these are
present in the boiler intake air vicinity, they must be removed.
If they cannot be removed, reinstall the air and vent lines per
the Installation and Operation Manual.
Inspecting the Boiler Interior
1. Remove the front cover and inspect the interior of the boiler.
2. Vacuum any sediment from inside the boiler and components.
Remove any obstructions.
L
Maintaining the Boiler 17
Don't do the below area

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CAUTION
Flushing the heat exchanger is a somewhat complicated
procedure. Read the following instructions carefully before
attempting this procedure. If you are uncertain about any of
the steps in the procedure, contact an authorized technician or
licensed professional. Keep in mind that improper maintenance
can void your warranty.
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Refer to the"2.2 Parts of the Boiler" on page 6 for details
about part locations.
Before flushing the Heat Exchanger, gather the following items:
• A bucket that is 5 gallons or larger
• Cleaning solution diluted with water
• 3 hoses
• A water circulation pump
To flush the Heat Exchanger:
I
Navien Easy valve Kit
16I
Circulation Pump
.41 Cold Water
Supply
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Hot Water Line
Flushing the Heat Exchanger 1. Press the Power button on the front panel to turn off the boiler.
2. Disconnect the power supply to the boiler.
3. Close the"C"and"D"valves on the supply and return water
lines.
4. Connect one tube to the"A"valve and place the free end in the
bucket.
5. Connect one of the tubes to the circulation pump outlet and
the return water line at the"B"valve.
6. Connect one tube to the circulation pump inlet and place the
free end in the bucket.
7. Pour the cleaning solution into the bucket
8. Open both "A"and "B"valves.
9. Turn on the circulation pump and allow the solution to
circulate through the boiler for at least 45 minutes.
10. Rinse the cleaning solution from the boiler:
a. Remove the free end of the drain tube from the bucket and
place it in the condensate drain or laundry tub (wherever
the boiler drains).
b. Close the"B"valve and open the"D"valve. Do not open the
"C"valve yet.
c. Allow water to flow through the boiler for 5 minutes.
d. Close the"A"valve and open the"C"valve.
11. Disconnect all tubes.
12. Remove the strainer from the boiler and clean out any residue.
13. Reinsert the filter and ensure the filter cap is securely
tightened.
14. Reconnect the power supply to the boiler.
15. Press the Power button on the front panel to turn on the boiler.
Flushing Kit
20 Maintaining the Boiler

5. Troubleshooting
5.1 Solving Basic Problems
If
you experience a problem with the boiler, refer to the following
chart for possible remedies. Error codes that appear on the front
panel display are explained in the following section.
For minor problems, resetting the boiler may resolve the issue. To
reset the boiler, press the Reset button on the front panel.
If resetting the boiler and attempting the remedies suggested below do not resolve the problem, contact an authorized technician, a licensed
professional, or Technical Support at 1-800-519-8794 for service instructions.
Problem Possible Cause(s) What to do
No water comes out when the hot water
tap is opened.
• Is the cold water inlet filter clean?
• Is an error code displayed on the front
panel?
• Is the boiler frozen?
• Ensure that the shut—off valves on the hot
and cold pipes are open.
• If an error code is displayed, refer to
"5.2 Understanding Error Codes" on
page 22.
The water from the hot water faucet is
cold or turns cold and stays cold.
• Is the hot water faucet open wide enough
draw at least 0.5 gallons of water per minute
(GPM) through the boiler?
• Is an error code displayed on the front
panel?
If an error code is displayed, refer to
"5.2 Understanding Error Codes"on
page 22.
The water from the hot water faucet is
not hot enough.
Is the set temperature too low?
• Check the boiler's temperature setting.
Refer to "3.2 Adjusting the Temperature"
on page 9.
• Check for cross plumbing between the
cold and hot water lines.
The water from the hot water faucet is
too hot.
Is the set temperature set too high?
Check the boiler's temperature setting.
See"3.2 Adjusting the Temperatureon
page 9.
Space heating side malfunction
Is the setting temperature too low?
Check the boiler's temperature setting.
See"3.2 Adjusting the Temperature"on
page 9.
Is there power to the system, or is the system
in stand by?
Make sure the power is on, and plugged
into the outlet with the correct voltage.
Press the Power button and raise the setting
temperature. Make sure the boiler is turned
on.
Is the system running for domestic hot water
(DHW)?
When the unit is heating for DHW, the
heating side does not work.
Is the filter on the heating side restricted?
Clean out filters that belong to the heating
side.
Troubleshooting 21

Memo