Navien CH-180 Mounting instructions

User’s Operation Manual - contents
Safety Instructions
Personal Safety
Warranty
Operating Instructions
Maintenance
Troubleshooting
& Error Code Guide
Safety Related Sysmbols 3
Warning – Safety Precautions 4
Danger 5
Danger – What to do if you Smell Gas 6
Danger – Compromised Venting System 6
Danger – Hot Water Temperature Setting 7
Equipment Protection and Personal Safety 8
Navien Warranty 10
Navien America, Inc. Limited Warranty 11
General Parts 12
Remote Controller 13
LCD Display Icons 14
Remote Controller On/Off 15
Setting the Clock 15
Hot Water Temp. Setting 16
Pre-Heating Setting 17
Room Temp. Setting (Options) 18
Return Temp. Setting (Options) 19
Supply Temp. Setting (Options) 20
K-Factor (Options) 20
Program (24th Timer) 21
Stand By 22
Lock 22
Heat Capacity Control 23
Capacity Control of the Whole 24
Setting up the Way of Control of Hot Water 25
Well Pump Setting 26
Supply Water Pressrue Setting 27
Function to Set the Number of Initial Activating
Boilers When Cascade is Used 28
Function to Set Pump Activating Boilers
When Cascade is Used 29
Combination Boiler : Heating 30
Combination Boiler : DHW 31
Cleaning the Combination Boiler 32
Draining the Combination Boiler 33
Auto feeder of the Combination Boiler 34
Cleaning the Inlet Water Filter 35
Cleaning the Space Heating Strainer 36
Cleaning the Intake Air Filter 37
Optional Outdoor Temp. Sensor 38
Freeze Protection 39
FND Display 40
Basic Troubleshooting (FAQ) 40
Error Code Guide 42
Service 51

Safety Instructions
Safety-related information and instructions have been provided in this
manual and on the Navien combination boiler to warn any person(s) of
potential hazards. Read and follow all safety information and instructions
throughout this manual. It is very important to understand the safety
instructions before installing, operating or servicing Navien combination
boilers.
This is safety alert symbol. It is used to alert you to potential
personal injury hazards. Obey all safety messages that follow this
symbol to avoid possible injury or death.
Indicates an imminent hazardous situation which , if not avoided,
could result in injury or death.
Indicates a potential hazardous situation which, if not avoided,
could result in injury or death.
Indicates an imminent hazardous situation which , if not avoided,
may result in minor or moderate injury.
Used whitout the safety alert symbol indicates a potential hazardous
situation which, if not avoided, could result in property damage.
Safety Related Symbols
DANGER
WARNING
CAUTION
CAUTION
All safety information will refer to a potential hazard. Follow the
instructions in this manual exactly to avoid the risk of injury.
“Should oerheating occur or the gas supply fail to shut off, do not turn
off or disconnect the electrical supply to the pump. Instead, shut off
the gas supply at a location external to the appliance.(verbatim)”
“Do not use this boiler if any part has been under water. Immediately
call a qualified service technician to inspect the boiler and to replace
any part of the control system and any gas control which has been
under water.”

Safety Instructions
Read and understand this safety information before installing,
operating or servicing this Navien Combination boiler.
This manual must remain with the Navien Combination boiler.
Have your installer show you the location of the gas shut-off
valve and show you how to close the valve. Close the manual
shut-off valve if the Navien Combination boiler ever becomes
subjected to overheating, fire, flood, physical damage or any
other such damaging condition. And, DO NOT operate the
Combination boiler again until it has been checked by qualified
personnel.
DO NOT turn on the Combination boiler unless water and gas supplies are fully
opened.
DO NOT turn on the Combination boiler if cold water supply shut-off valve is closed.
DO NOT use this Navien Combination boiler for other than its intended purpose as
described in this manual.
DO NOT attempt to repair or replace any part of your combination boiler unless it is
specifically recommended in this manual. All other servicing should be referred to an
Authorized Service Technician.
Make certain power to the Combination boiler is turned “OFF” before attempting to
make any repairs to your Navien combination boiler.
Label all wires prior to disconnecting and servicing controls. Wiring errors can cause
improper and/or dangerous operation. Verify proper operation after servicing.
Improper adjustment, alteration, service or maintenance can cause property damage,
personal injury or death.
To prevent scalding always check the temperature of the hot water before showering,
bathing etc.
DO NOT attempt to change the temperature setting while someone is using the combi-
nation boiler.
DO NOT use parts other than those specified for this equipment.
DO NOT operate the combination boiler if you feel something is wrong with the unit.
DO NOT allow children to operate or otherwise handle the unit.
This product must be installed and serviced by a licensed plumber, a
licensed gas fitter, or a professional service technician. Improper installation
and/or operation by an unqualified person will void the warranty.
WARNING
Safety Precautions
WARNING

Safety Instructions
Vapors from flammable Combination boiler has a main
liquids will explode and burner flame:
catch fire causing death or
severe burns. 1. Which can come on at any
Do not use or store flammable time ; and
products such as gasoline, 2. May ignite flammable vapors.
solvents or adhesives in the
same room or area near the Vapors :
boiler. 1. cannot be seen ;
2. are heavier than air ;
Keep flammable products: 3. go a long way on the floor ; and
1. far away from boiler; 4. can be carried from other rooms
2. in approved containers; rooms to the main burner flame
3. tightly closed ; and flame by air currents.
4. out of children’s reach.
Read and follow boiler warnings and instructions. If User’s
operation manual is missing, contact the retailer or manufacturer.
DO NOT place flammable liquids such as oils
or gasoline, etc. near the combination boiler.
DO NOT place combustibles such as
newspapers and laundry etc. near the
combination boiler or venting system.
DO NOT place or use hair spray, spray paint
or any other type of spray can near the
combination boiler or the venting system
(including the vent terminator).
DO NOT place anything in or around the vent
terminals that could obstruct the air flow in and
out of the combination boiler such as a clothes
line.
DO NOT operate the combination boiler when
the front cover is opened. Operating the
combination boiler under such condition may
cause fire or carbon monoxide(CO) poisoning,
which may result in property damage,
personal injury or even death.
DANGER

Safety Instructions
Failure to follow the Venting Section of the installation manual may result in the
unsafe operation of this combination boiler. To avoid the risk of fire, explosion or
asphyxiation from carbon monoxide, never operate the combination boiler unless
it is properly vented to outside and has an adequate air supply for proper
operation.
Be sure to inspect the vent terminator and the air intake pipe annually to ensure
safe operation of the combination boiler.
Immediately turn off and do not use the combination boiler if any of the vent
pipes, vent elbows and/or the intake air pipe are :
i.damaged in any way.
ii.have separated at a joint.
iii.are cracked or show evidence of corrosion, rusting or melting.
Improper venting may cause a build-up of carbon monoxide (CO).
Breathing carbon monoxide can cause brain damage or death. Read and
follow the above instructions carefully.
If you do not follow these instructions exactly, a fire or an explosion may result causing
property damage, personal injury or loss of life.
DO NOT OPERATE THE COMBINATION BOILER. DO NOT OPERATE
ANY FAUCET. Smell all around the combination boiler area for gas. Be
sure to smell near the floor because as some gas is heavier than air
and will settle near the floor.
DO NOT try to light any appliance.
DO NOT touch any electric switch.
DO NOT use any phone in your building.
Immediately contact your Gas Supplier from a neighbor’s phone.
Follow the Gas Supplier’s instructions.
If you cannot reach your Gas Supplier, call 911 for police and/or the fire
department.
DO NOT return to your home until authorized by your gas supplier or the fire
department.
DANGER
DANGER
WARNING
WHAT TO DO IF YOU SMELL GAS
COMPROMISED VENTING SYSTEM

Safety Instructions
Households with small children, disabled or elderly persons may require
120°F (49°C) or lower temperature setting to prevent contact with “HOT”
water.
Water temperatures over 125°F can cause severe burns instantly or death
from scalds. If the proposed combination boiler outlet temperature is above
125°F, a thermostatically controlled mixing valve or temperature limiting
valve should be considered to reduce the risk of scalding.
Contact a licensed plumber or the local plumbing authority for further
information.
This Navien Combination boiler is factory
set at 120°F (49°C) for your safety and
comfort. Increasing the set temperature
increases the risk of accidental scalding.
Consult the chart below before you decide
to adjust the set temperature.
DANGER
DANGER
HOT WATER TEMPERATURE SETTING
G
Water temperature over 125°F
can cause severe burns instantly
or death from scalds.
Children, disabled and elderly are
at highest risk of being csalded.
See instruction manual before
setting temperature at water
heater.
Feel water before bathing or
showering.
Temperature limiting valves are
avaliable, see manual.

Equipment Protection and Personal Safety
If the ignition fails, the gas supply is automatically cut off. An error code will appear as
a flashing 2-digit code on the room thermostat. The error codes are discussed in the
troubleshooting section of the operation manual.
If the flame fails and/or the re-ignition attempt fails, the gas supply is automatically cut
off. An error code will appear on the room thermostat. Refer to troubleshooting guide
for further information.
When the power is restored after a power failure, the combination boiler will automatically
start and return to normal operation, manual reset is not required.
Occasionally an excessive gust of wind may be forced into the flue pipe. The air-ratio
control module will detect these strong back-drafts. To prevent any products of
combustion from re-entering the building through the open flue, the gas supply will be
automatically cut off. An error code will appear on the room. Refer to troubleshooting
guide for further information.
Abrupt, noisy startups and backfires are prevented by “soft ignition” a trademark of
our air-ratio control module.
Any overheating of the burners or heat exchanger will automatically shut down the
supply of gas to the burners. An error code will appear on the room thermostat. Refer
to troubleshooting guide for further information.
The water level in the heat exchanger is continuously monitored to prevent the combination
boiler from operating if there is no water or a restricted flow of water in the unit. The
combination boiler will be automatically shut down and an error code will appear on
the room thermostat. Refer to troubleshooting guide to further information.
Should the water level in the system fall too low, a sensor will automatically activate
the re-fill circuit.
1. Ignition Failure
2. Flame Detection
3. Power Interruption
4. Excessive Air Pressure
5. Explosive Re-ignition Protection
6. Overheat Protection
7. Low Water-Level Safety
8. Automatic Water Fill

During the heating season, a sensor inside the combination boiler will automatically
detect and initiate a safety heating cycle to prevent internal equipment damage from
occurring freezing temperature exist.
Note ! －When there is no gas supply available, the circulation pump will automatically
start up to guard the pipes from freezing.
To prevent damage from over pressure, each combination boiler is protected from
occasional surges in gas pressure by a pressure regulator located in the gas valve.
Any short-circuit occurring in the combination boiler’s electrical circuit will immediately
‘blow’ the internal glass fuse(s) and automatically cut off the gas supply.
Each combination boiler is specially grounded internally and externally to protect
against lightning strikes.
The combination boiler is designed to maintain a safe air and gas ratio and
combustion rate. This function is continuously monitored by the combination boiler’s
air-ratio control module.
Should the thermostat fail to function properly, as a safeguard, the combination
boiler’s gas supply will be automatically shut down.
The rotation of the fan is automatically detected and controlled. Fan failure will stop
the operation of the combination boiler.
Excessive temperatures will automatically stop the combination boiler.
Use only inhibited propylene glycol solutions specifically formulated for space heating
systems. Do not use ethylene glycol, which is toxic and can attack gaskets and seals
used in space heating systems.
9. Freeze Protection
10. Gas Pressure Control
11. Short-Circuit Protection
12. Lightning Protection
13. Carbon Monoxide Protection
14. Thermostat Control Failure
15. Auto Fan Detection
16. Boiling Prevention
17. Space Heating Freeze Protection
Equipment Protection and Personal Safety

Navien Limited Warranty
Navien America, Inc. (Navien) warrants this Navien gas condensing combination and
its component parts to be free from defects in materials and workmanship, under
normal use and service, for the Applicable Warranty Period. At its option, Navien will
replace the defective component part(s), in accordance with the terms of this Limited
Warranty, if it fails in normal use and service during the Applicable Warranty Period.
The replacement component part(s) must be Navien Original factory component
part(s). The replacement component part(s) will be warranted only for the remaining
portion of the original component part’s Applicable Warranty Period.
GENERAL
APPLICABLE WARRANTY PERIODS
EFFECTIVE DATE
Period of Coverage
Heat Exchanger All other Parts and Components
10 years 5 years
Proof of purchase is required to obtain warranty service. You can show
proof of purchase with dated sales receipt, by completing and mailing
the enclosed warranty registration card within 30 days of purchasing the
product or by registering online at www.navienamerica.com
The Effective Date of warranty coverage (the beginning of the Applicable Warranty Periods)
is the date of purchase of this combination boiler, if properly registered.
HEAT EXCHANGER WARRANTY
The Applicable Warranty Period for a CH ASME Heat Exchanger failure installed in a
Residential application is Ten (10) years from the Effective Date.
PARTS WARRANTY (excluding heat exchanger)
The Applicable Warranty Period for a CH ASME Part(s) failure installed in a Residential
application is Five (5) years from the Effective Date.

Navien Limited Warranty
LABOR ALLOWANCE:
The Applicable Period for this Labor Allowance for all Combination boiler models is One
(1) year from the Effective Date. The payment and amount of any payment are subject
to approval at Naiven’s sole discretion. The Labor Allowance will be paid based on
Navien’s Schedule of Labor Allowances.
TRANSFERABILITY
This warranty is offered to the original and subsequent owners of the combination boiler
but is limited to the original address registered with the warranty only. The warranty will
be void if the combination boiler is relocated to any other location.
WARRANTY EXCLUSIONS
This warranty does not cover the following conditions:
Damages, malfunctions or failures resulting from failure to install the combination
boiler in accordance with applicable building codes, ordinances or normal plumbing
and electrical trade practices.
Damages, malfunctions or failures resulting from improper installation or failure to
operate and maintain the combination boiler in accordance with the manufacturer’s
instructions provided.
Performance problems caused by improper sizing of the combination boiler or the gas
supply line, the venting connection, combustion air openings, electric service voltage,
wiring or fusing.
Damages, malfunctions or the all failures caused by conversion from natural gas to LP
gas or LP gas to natural gas or attempt to operate with a type of gas not specified for
the combination boiler.
Damages, malfunctions or failures caused by operating the combination boiler with
any parts removed or with parts that have been modified, altered or unapproved for
installation.
Damages, malfunctions or failures caused by abuse, negligence, alteration, accident,
fire, flood, freezing, lightning and other acts of God.
Heat Exchanger failures caused by operating the combination boiler in a corrosive or
contaminated atmosphere.
Damages, malfunctions or failure caused by poor water quality, lime or mineral build-up
or sediment build-up.
Damages, malfunctions or failures caused by operating the unit at water temperatures
outside the factory calibrated temperature limits and/or exceeding the maximum
setting of the high limit control.
Heat Exchanger failures caused by operating the combination boiler when it is not
supplied with potable water at all times.
Damages, malfunctions or failures caused by subjecting the heat exchanger to pressures
or firing rates greater or lesser than those shown on the rating plate.
Units installed outside of the fifty states (and the District of Columbia) of the United
States of America and outside of Canada.
Rating plate has been removed by an unauthorized person. A combination boiler
should not be operated if the rating plate has been removed.
Damage due to freezing.

Water Inlet Filter
Gas Connection
Auto Feeder
Connection
DHW Cold Water
Inlet Connection
Condensate Water
outlet
Space Heating
Return Connection
DHW How Water
Outlet Connection
Space Heating
Supply Connection
Pump Drain
Plug
Space Heating
Strainer

Remote Controller
LCD Display
Indicates functions and
current status
LED Indicator
Flashing green LED
indicator
- Bumers on
Flashing red LED
indicator - Error
Hesting
Heating mode selection
[Supply/Return]
Power
Press the “ON/OFF”
button
Program
Timer setting for 24 hour
& clock setting
Center Dial
Temperature & timer
adjustment
DHW
Domestic Hot Water
Set up
Stand By
Stand by and lock
function settinge

LCD Display Icons

Remote Controller ON / OFF
Setting the Clock
Press the ON/OFF button to turn the
LCD on and off.
When the ON/OFF button is pressed,
the LCD display switches to only a clock
display. In this status any heating mode
& DHW are disabled.
Press and hold “Program” button for 3
seconds, the “minutes” blink on the
timer.
Use the center dial to move around the
“minutes” and tap the “Program” button
and the “hour” will blink. Use the center
button to adjust the hour. Tap the
“Program” button to adjust the AM/PM
setting. Leave alone and the display will
automatically set.

Hot Water Temperature Setting
If the DHW button is pressed, ‘hot
water’ icon flickers and temperature of
hot water (86~120 ) is displayed.
If temperature over 120 is needed,
DHW and Heating button shall be
pressed simultaneously. Then user can
adjust set temperature of hot water up
to 140
When the ‘hot water’ icon flickers turn the
dial to set desire hot water temperature.
After a few seconds, the desire
temperature is saved and get back to
the previous function.
Press and hold “DHW” for 3 seconds,
‘hot water’ icon flickers.
Be careful not to scald with high
Temperature hot water.
When the “hot water” icon flickers
press “DHW” to set desire hot water
temperature (120~140°F). Temperature
increases by 5°F. To lower the
temperature turn the dial. After a few
seconds, the desire temperature is
saved and get back to the previous
function.

Pre-heating Setting
Please turn off the power of Remote
Controller pressing ON/OFF button.
When the “Clock” is flashing with the
cursor “■”use the center dial to move
the cursor around. Tap the “Heating”
button to enable (solid) or disable
(blank) the specified time frame.
After setting the timer, press and hold
“Stand By” and “Program” buttons
simultaneously for 3 seconds. Preheating
function is only available during Remote
Controller is on.
Press and hold the “Stand By” and
“Program” buttons simultaneously for 3
seconds.

Room Temperature Setting (Options)
Tap “Heating” and when “room
temperature heating” icon is blinking
use the center dial to set the desired
temperature between 50~100 . Leave
alone and the display will automatically
set.
Tap “Heating” until “room temperature
heating” icon appears. Leave alone
and the display will automatically set.

Return Temperature Control (Options)
Tap the “HEATING” button until the
“Return temperature heating” icon
appears. Leave alone and the display
will automatically set.
Depending on the setting temperature,
the “ASA Control” automatically controls
the heating operation. And the “green”
LED indicator will turn on.
Tap “Heating” and when “Return
temperature heating” icon is blinking
use the center dial to set the desired
temperature between 90~140 . Leave
alone and the display will automatically
set.

Supply temperature Control (Option)
K Factor (Option)
Tap “Heating” until “Supply temperature
heating” icon appears. Leave alone and
the display will automatically set.
Tap “Heating” and when “Supply
temperature heating” icon is blinking
use the center dial to set the desired
temperature between 105~185 . Leave
alone and the display will automatically
set.
Tap “Heating” until “K Factor” icon
appears. Leave alone and the display
will automatically set.
Tap “Heating” and when “K Factor” icon
is blinking use the center dial to set the
desired value between 0.5~ 6. Leave
alone and the display will automatically
set and return to its original state.