Navien CH-180 User manual

Gas Water Heater Operation
3
- Do not store or use gasoline or other flammable vapors and liquids in
the vicinity of this or 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.
Please return the “Installation Manual”to the customer after installing.
CAUTION
This product warranty is valid only used in the America and Canada but
automatically be voided for other countries. (for America and Canada
unit standard only)
WARNING
If not followed this Installation Manual exactly, a fire or explosion may
result causing property damage, personal injury or death.

Navien Gas Water Heater Operation
4
█ Owner‟s Operation Manual - contents
Safety Instructions 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
Personal Safety Equipment Protection and Personal Safety ----- 8
Warranty Navien Warranty -------------------------------------- 10
Navien America, Inc. Limited Warranty --------- 11
Operating Instructions 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 InitialActivating
Water Heaters When Cascade is Used ---------- 28
Function to Set Pump Activating Water Heaters
When Cascade is Used ------------------------------- 29
Combination Water Heater : Heating ------------- 30
Combination Water Heater : DHW ---------------- 31
Maintenance Cleaning the Combination Water Heate --------- 32
Draining the Combination Water Heater --------- 33
Auto feeder of the Combination Water Heater -- 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
Troubleshooting FND Display ---------------------------------------------- 40
& Error Code Guide Basic Troubleshooting (FAQ) ----------------------- 40
Error Code Guide -------------------------------------- 42
CONTENTS

Combination water heater operation
3
█ Safety Instructions
Safety-related information and instructions have been provided in this manual
and on the Navien combination water heater 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 water
heaters.
Safety Related Symbols
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.
All safety information will refer to a potential hazard. Follow the
instructions in this manual exactly to avoid the risk of injury.
SAFETY INSTRUCTIONS
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.
DANGER
WARNING
CAUTION
CAUTION
SAFETY INSTRUCTIONS

Combination water heater operation
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█ Safety Instructions
Safety Precautions
Read and understand this safety information before installing,
operating orservicingthisNavien CombinationWaterHeater.
This manual must remain with the Navien Combination Water
Heater.
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 Water
Heater ever becomes subjected to overheating, fire, flood,
physical damage or any other such damaging condition.
And, DO NOT operate the Combination Water Heater
again until it has been checked by qualified personnel.
DO NOT turn on the Combination Water Heater unless water and gas supplies
are fully opened.
DO NOT turn on the Combination Water Heater if cold water supply shut-off valve is
closed.
DO NOT use this Navien Combination Water Heater for other than its intended
purpose as described in this manual.
DO NOT attempt to repair or replace any part of your combination water heater
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 Water Heater is turned “OFF”before
attempting to make any repairs to your Navien combination water heater.
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
combination water heater.
DO NOT use parts other than those specified for this equipment.
DO NOT operate the combination water heater if you feel something is wrong
with the unit.
DO NOT allow children to operate or otherwise handle the unit.
SAFETY INSTRUCTIONS
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.
SAFETY INSTRUCTIONS
SAFETY INSTRUCTIONS

Combination water heater operation
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█ Safety Instructions
DO NOT place flammable liquids such as
oils or gasoline, etc. near the combination
water heater.
DO NOT place combustibles such as
newspapers and laundry etc. near the
combination water heater or venting system.
DO NOT place or use hair spray, spray
paint or any other type of spray can near the
combination water heater 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 water
heater such as a clothes line.
DO NOT operate the combination water
heater when the front cover is opened.
Operating the combination water heater
under such condition may cause fire or
carbon monoxide(CO) poisoning, which
may result in property damage, personal
injury or even death.
Vapors from flammable Water heater 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 :
water heater. 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 heater ; 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 water heater warnings and instructions. If owner‟s
operation manual is missing, contact the retailer or manufacturer.
SAFETY INSTRUCTIONS

Combination water heater operation
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█ Safety Instructions
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 WATER HEATER. DO NOT
OPERATE ANY FAUCET. Smell all around the combination water
heater area for gas. Be sure to smell near the floor because as
some gas is heavier than air andwill 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.
Failure to follow the Venting Section of the installation manual may result
in the unsafe operation of this combination water heater. To avoid the risk
of fire, explosion or asphyxiation from carbon monoxide, never operate
the combination water heater 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 water heater.
Immediately turn off and do not use the combination water heater 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.
SAFETY INSTRUCTIONS

Combination water heater operation
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█ Safety Instructions
This Navien Combination Water Heater 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.
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 water heater 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.
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.

Combination water heater operation
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█ Equipment ProtectionandPersonal Safety
1. Ignition Failure
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.
2. Flame Detection
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
furtherinformation.
3. Power Interruption
When the power is restored after a power failure, the combination water heater will
automatically start and return to normal operation, manual reset is not required.
4. Excessive Air Pressure
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.
5. Explosive Re-ignition Protection
Abrupt, noisy startups and backfires are prevented by “soft ignition” a trademark of our
air-ratiocontrol module.
6. Overheat Protection
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.
Refertotroubleshootingguidefor further information.
7. Low Water-Level Safety
The water level in the heat exchanger is continuously monitored to prevent the
combination water heater from operating if thereis nowater or a restricted flow of water in
the unit. The combination water heater will be automatically shut down and an error code
will appear on theroom thermostat. Refer totroubleshooting guidetofurther information.
8. Automatic Water Fill
Should the water level in the system fall too low, a sensor will automatically activate
the re-fillcircuit.
PERSONAL SAFETY

Combination water heater operation
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█ Equipment ProtectionandPersonal Safety
9. Freeze Protection
During the heating season, a sensor inside the combination water heater 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 automaticallystart
up to guard thepipes fromfreezing.
10. Gas Pressure Control
To prevent damage from over pressure, each combination water heater is protected
from occasional surges in gas pressure by a pressure regulator located in the gas
valve.
11. Short-Circuit Protection
Any short-circuit occurring in the combination water heater‟s electrical circuit will
immediately „blow‟ the internal glass fuse(s) and automatically cut off the gas supply.
12. Lightning Protection
Each combination water heater is specially grounded internally and externally to protect
against lightningstrikes.
13. Carbon Monoxide Protection
The combination water heater is designed to maintain a safe air and gas ratio and
combustion rate. This function is continuously monitored by the combination water
heater‟s air-ratio control module.
14. Thermostat Control Failure
Should the thermostat fail to function properly, as a safeguard, the combination water
heater‟s gas supply will be automatically shut down.
15. Auto Fan Detection
The rotation of the fan is automatically detected and controlled. Fan failure will stop
the operation of the combination water heater.
16. Boiling Prevention
Excessive temperatures will automatically stop the combination water heater.
17. Space Heating Freeze Protection
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.
PERSONAL SAFETY

Combination water heater operation
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█ Navien Limited Warranty
GENERAL
Navien America, Inc. (Navien) warrants this Navien gas condensing combination water
heater 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.
APPLICABLE WARRANTY PERIODS
Period of Coverage
Heat Exchanger
All other Parts and Components
10 years
5 years
EFFECTIVE DATE
The Effective Date of warranty coverage (the beginning of the Applicable Warranty
Periods) is the date of purchase of this combination water heater, if properly registered.
HEAT EXCHANGER WARRANTY
The Applicable Warranty Period for a CH series 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 series Part(s) failure installed in a Residential
application is Five (5) years from the Effective Date.
WARRANTY
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

Combination water heater operation
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█ Navien Limited Warranty
LABOR ALLOWANCE:
The Applicable Period for this Labor Allowance for all Combination Water Heater
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
water heater but is limited to the original address registered with the warranty only. The
warranty will be void if the combination water heater 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
water heater 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 water heater in accordance with the
manufacturer‟s instructions provided.
Performance problems caused by improper sizing of the combination water heater
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 water heater.
Damages, malfunctions or failures caused by operating the combination water heater
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 water heater 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 water heater 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 water
heater should not be operated if the rating plate has been removed.
If the combination water heater is installed outdoors;
Damage due to freezing.
WARRANTY

Combination water heater operation
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█ General Parts
`
CH Combination Water Heater
OPERATING INSTRUCTIONS
Front Cover
Indicator
Exhaust GasCombustion Air Intake
Gas Connection
Water Supplement
Connection
Condensed Water
Clean outlet
Cold Water Inlet
Connection
Hot Water outlet
Connection
Heating Return
Connction
Heating Supply
Connection
Water Inlet Filter
Strainer
Pump Drain
Port
Water Inlet Filter
Gas Connection
Auto Feeder
Connection
DHW Cold Water
Inlet Connection
Condensed Water
Clean outlet
DHW How Water
Outlet Connection
Space Heating
Return Connection
Space Heating
Supply Connection
Space Heating
Strainer
Pump Drain
Coke

Combination water heater operation
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██ Remote Controller
OPERATING INSTRUCTIONS

Combination water heater operation
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█ LCD Display Icons
Timer display for 24
hour clock
Room temperature
set
Clock
Space heating Return
water temperature
Temperature
Space heating Supply
temperature
24 Hour heating timer
indicator
THERMOSTAT
controlled heating
Lock
Hot water “ In use ”
Stand By
Hot water pre-heating
Current temperature
K Factor
Setting temperature
Energy saving mode
OPERATING INSTRUCTIONS

Combination water heater operation
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█ Remote Controller ON/ OFF
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.
█ Setting the Clock
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.
OPERATING INSTRUCTIONS

Combination water heater operation
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█ 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.
OPERATING INSTRUCTIONS

Combination water heater operation
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█ Pre-heating Setting
Please turn off the power of Remote
Controller pressing ON/OFF button.
Press and hold the “Stand By”and
“Program”buttons simultaneously for
3 seconds.
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.
OPERATING INSTRUCTIONS

Combination water heater operation
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█ Room Temperature Setting (Options)
Tap “Heating”until “room temperature
heating”icon appears. Leave alone
and the display will automatically set.
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.
OPERATING INSTRUCTIONS

Combination water heater operation
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█ Return Temperature Control (Options)
Tap the “HEATING”button until the
“Return temperature heating”icon
appears. Leave alone and the display
will automatically set.
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.
Depending on the setting temperature,
the “ASA Control”automatically controls
the heating operation. And the
“green” LED indicator will turn on.
OPERATING INSTRUCTIONS

Combination water heater operation
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█ Supply temperature Control (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.
█ K Factor (Option)
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.
OPERATING INSTRUCTIONS