State Water Heaters Gas Water Heater Instruction manual

Printed in the U.S.A. 0604 PART NO. 184959-089
25,000 – 194,000 BTU Tankless Water Heater
WARNING: If the information in this manual 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.
Owner’s Guide and Installation Manual
Thank you for purchasing this Gas Water Heater. Before using, please:
Read this manual completely for correct installation and operation
instructions.
Completely fill out the warranty registration card (included separately)
and mail the detachable portion.
Keep this manual (and the remainder of the warranty registration card)
where it can be found whenever necessary.
Low NOx
Approved by SCAQMD

2
Contents
Contents ........................................................................................................ 2
Owner's Guide
Important Safety Information....................................................................... 3
General Parts
Main Unit.................................................................................................... 7
(Optional) Remote Controller .................................................................. 8
Initial Operation ............................................................................................ 9
How to Use
Setting and Using the Water Heater........................................................ 10
Preventing Damage from Freezing ............................................................ 11
Regular Maintenance................................................................................... 13
Troubleshooting .......................................................................................... 15
Follow-up Service ........................................................................................ 19
Specifications .............................................................................................. 20
External outfitting ........................................................................................ 21
Combustion unit and gas route.................................................................. 23
Hot-water feed route.................................................................................... 25
Electronic control unit................................................................................. 27
Electronic control unit, Remote controller and Attached set.................. 28
Installation Manual ...................................................................................... 29
1. Included Accessories............................................................................ 30
2. Optional Accessories............................................................................ 30
3. Before Installation ................................................................................. 31
4. Choosing Installation Site .................................................................... 31
5. Installation Clearances ......................................................................... 33
6. Installation.............................................................................................. 34
7. Vent Pipe Installation (Indoor Installation Only)................................. 35
8. Gas Piping .............................................................................................. 37
9. Water Piping........................................................................................... 39
10. Plumbing Applications.......................................................................... 40
11. Electrical Wiring .................................................................................... 41
12. Maintenance ........................................................................................... 44
13. Trial Operation ....................................................................................... 44
14. Dimensions ............................................................................................ 46
Remote Controller Installation Guide ....................................................... 48

3
Prohibited Don’t
touch.
Don’t
disassemble
the equipment.
Don’t touch
with a wet
hand.
No flame.
High
Temperature.
To prevent damage to property and injury to the user, the icons shown below will be used to warn of
varying levels of danger.
Every indication is critical to the safe operation of the water heater and must be understood and
observed.
Potential dangers from accidents during installation and use are divided into the following three
categories. Closely observe these warnings; they are critical to your safety.
Other icons
Danger
Warning
Caution
Denotes content that may result in instantaneous fire, serious injury
and even death when ignored.
Denotes content that may result in fire, serious injury and even
death when ignored.
Denotes content that may result in bodily injury and physical
damage when ignored.
The content following this icon is necessary to understand for safe
and easy use of this water heater.
Remarks
Be sure
to do. Ground.
Electric
Shock.
Danger
Do not use the water heater if
the exhaust pipe is displaced, has
holes, or is corroded.
If you detect a gas leak:
1. Do not try to light any appliance
2. Do not touch any electrical switch;
do not use any phone in your
building.
3. Immediately call your gas supplier
from a neighbor’s phone. Follow
the gas supplier’s instructions.
4. If you cannot reach your gas
supplier, call the fire department.
Icons warning of risk level
Important Safety Information-1
Warning
Check the temperature
of the running hot water
before entering the
shower.
Check the temperature
before stepping into
the bath tub.
(Continued)
If you detect abnormal combustion
or abnormal odors, or during an
earthquake, tornado or fire:
1. Turn off the hot water supply
2. Turn off the power to the water
heater
3. Turn off gas and water at the
main
4. Consult the nearest sales agent

4
Do not turn off the water heater or
change the water temperature while
someone is bathing.
Be sure the gas/power supplied
matches the gas on the rating
plate.
Do not allow small children to play
unsupervised in the bathroom.
Do not allow small children to
bathe unsupervised.
Consult the nearest sales agent if
the water heater location needs to
be changed.
Contact a qualified service
technician for any necessary
repairs, service or maintenance.
Important Safety Information-2
Leave the proper clearance between
the water heater and nearby objects
(trees, timber, boxes with flammable
materials etc.).
Do not place or use a spray can
near the heater or the exhaust vent
terminal.
Left side:
Min. 2" Right side:
Min. 2"
Min. 3" from
vent pipe
Do not place combustibles such as
laundry, newspapers, oils etc. near
the heater or the exhaust vent
terminal.
Exhaust vent
terminal (indoor
installation)
*Indicates suggested clearances for
maintenance.
Front:
Sug. 24"*
[When installing indoors]
Check the air supply
vent for dust or
obstructions.
Do not use combustible chemicals
such as oil, gasoline, benzene etc.
in the vicinity of the heater or the
exhaust vent terminal.
Unit
(Continued)
Do not connect the water heater to
a solar water heater.
This can result in unreliable temperature
control, scalding or equipment failure.
For Natural Gas

5
Be sure to electrically ground the
unit.
Do not touch the power cord with
wet hands.
Keep power cord free of dust.
Do not use a broken or modified
power cord. Do not bind, bend or
stretch power cords.
Do not scratch, modify, or subject
them to impact or force.
Do not use the water heater for
other than hot water supply,
shower and bath.
Do not touch the exhaust vent pipe
during or immediately after
operation of the water heater.
Do not use hair spray or spray
detergent in the vicinity of the
heater.
Do not install in salons or other
locations where hair spray or other
aerosols will be used.
Do not install in locations where
excessive dust or debris will be
in the air.
Caution

6
Important Safety Information-3
This unit is only approved for installation
up to 4500 ft. above sea level.
Do not disassemble the remote controller.
Do not use benzene, oil or fat detergents
to clean the remote controller.
This may cause deformation.
Do not get the remote controller wet.
Although it is water resistant, too much water can
cause damage.
Do not splash water on the remote
controller. Do not expose the remote
controller to steam.
Do not locate the remote controller near stoves or
ovens, this may cause damage or failure.
Preventing damage from freezing ( p.11)
Damage can occur from frozen water within the
device and pipes even in warm environments.
Be sure to read below for appropriate measures.
Repairs for damage caused by freezing are not
covered by the warranty.
Take necessary measures to prevent
freezing of water and leakage of gas when
leaving the unit unused for long periods of
time. ( p.12)
If it is snowing, check the air inlet, exhaust
gas vent and exhaust vent terminal for
blockage.
Do not use parts other than those specified
for this equipment.
Do not drink water that has been inside the
unit for an extended period of time. Do not
drink the first use of hot water from the
unit in the morning.
Clean the filter on the water inlet as
frequently as required by the quality of
your local water.
Keep the area around the unit clean.
If boxes, weeds, cobwebs, cockroaches etc. are in
the vicinity of the unit, damage or fire can result.
Do not install the equipment where the
exhaust will blow on walls or windows.
Do not use spring water or well water.
Do not use hard or acidic water.
These will void the warranty.
If scale forms and a descaling solution
must be used, the warranty will be void.
Check ignition during use and extinction
after use.
Do not run water through the unit when
unit is not on.
When discharging hot water, make sure the unit is
ON.
If water is run through the unit with the unit
OFF, water may condense inside the unit and cause
incomplete combustion or damage to the internal
electrical components.
For single-handle fixtures or valves, turn the fixture
all the way to the hot side, and adjust the
temperature from there.
Remark

7
Indoor/Outdoor Wall Mounted, Power Vented Model
* The above illustration shows an example of installation.
The exact installation configuration may be slightly different.
Main Unit
Flue Collar
Front Cover
Air Inlet
Water Supply Valve
Gas Supply Valve
Water Drain Valve (with Water Filter)
(Inside Water Inlet) ( p.14)
Pressure Relief Valve
General Parts

8
Display For setting the hot
water temperature,
the flow meter alarm,
and other settings.
Power On/Off Button
For turning the
heater on and off.
Flow Meter Alarm Set Button
For setting the flow
meter alarm.
Setting Buttons
(Optional) Remote Controller (9004223)
* Before use, remove the protective sheet from the remote controller surface.
* The unit has been shipped from the factory with the remote control set at 110°F.

9
Initial Operation
Before the first use of your water heater, make the following preparations.
Follow steps 1 through 4.
1Open the water supply valve.
Open a hot water fixture to confirm that
water is available, and then close the
fixture again.
3Open the gas supply valve.
Hot water fixture
2
Turn on the power.
CLOSED
4
OPEN

10
3
Mix for desired temperature.
The factory temperature setting is 120°F (fixed). Mix with cold water with a mixing valve
or at the fixture for desired temperature.
To prevent scalding.
Check the temperature of the running hot
water before using. Temperatures above
125°F can scald instantly.
1Check that electrical power is connected.
2
4
How to Use (For N-063S)
Setting and Using the Water Heater
Temperature
If you want to the temperature to be changed to 130°F or 140°F, contact the installer or sales agent.
Turn on hot water.
Turn off the hot water.
WARNING
High Temperature
The electrical power does not need to
be disconnected between uses.
Hot water
Water
scalding.scalding.

11
* Damage can occur from frozen water within the device and pipes even
inwarmenvironments.Be sure to readbelowforappropriatemeasures.
* Repairsfordamagecausedbyfreezingarenotcoveredby the warranty.
Remarks
Freezing cannot be prevented when the power plug is unplugged. Do not remove the power
plug from the wall outlet.
(Freezing will be prevented regardless of whether the operation switch is ON or OFF.)
* The freeze prevention heaters will not prevent the plumbing external to the unit from freezing.
Protect this plumbing with insulation, heat tape or electric heaters, solenoids, or pipe covers.
If there remains a freezing danger, contact the nearest sales agent.
Take the measures below for extremely cold temperatures*.
(outside temperature including wind chill factor less than 5°F)
This method can protect not only to the heater, but also to the water supply,
water piping and mixing valves.
1. Turn off the power.
2. Close the gas supply valve.
3. Open a hot water fixture, and keep a small stream of hot water
running. (400cc/minute or about 1/4" thick.)
* If there is a mixing valve, set it to the highest level.
* When linking multiple units, discharge water equivalent to
400 cc/minute per unit.
4. The flow may become unstable from time to time. Check the flow
30 minutes later.
* In general, it is not advisable to run water through the unit when
it is OFF (see p. 6), but in this case freeze prevention is more
important.
* Remember to set mixing valves and fixtures to their original levels before using the unit again
to prevent scalding.
* If there is still a chance that the unit will freeze, drain the unit as on the next page.
1/4" thick
Hot Water Fixture
Preventing Damage from Freezing-1
Freezing is prevented within the device automatically by the freeze-prevention heater
If water will not flow because it is frozen
1. Close the gas and water valves.
2. Turn off the power button.
3. Open the water supply valve from time to time to check whether water is running.
4. When the water is flowing again, check for water leaks from the equipment and piping
before using.
If the heater or the piping is frozen, do not use the heater or it may get damaged.

12
1. Close the gas valve.
2. (1) Turn the power on.
(2) Turn and leave open the hot-water tap for more than 1 minute and close.
* If multiple units are being used, drain one minute for each unit.
* An 11 Error Code may appear on the remote controller.
This is not a malfunction of the unit. Do not turn Power ON/OFF Button OFF.
3. Close the water supply valve, disconnect
the electrical power supplied to the unit.
4. Fully open all hot water fixtures.
5. Open all drain plugs and drain the water out
of the unit.
6. When the water is completely drained, replace all drain
plugs and close the hot water fixtures.
If the water heater will not be used for a long period of time,
Drain the water.
Drain the water as follows:
To avoid burns, wait until the equipment cools down
before draining the water. The appliance will remain hot
after it is turned off.
High Temperature
Drain water into a bucket to prevent water damage.
Caution
Do not touch with wet hands.
Fixture
Fixture
Turning the Unit Back On
1. Check that all drain plugs are inserted.
2. Check that all hot water fixtures are closed.
3. Follow the procedure on p.9 “Initial operation”, steps 1 through 4.
Drain Plugs
Preventing Damage from Freezing-2

13
To avoid burns, wait until the equipment cools down
before draining the water. The appliance will remain
hot after it is turned off.
High Temperature
Periodic Maintenance
Wipe the outside surface with a wet cloth, then dry the surface. Use a neutral detergent to
clean any stains.
•Do not use benzene, oil or fatty detergents to clean the remote controller;
deformation may occur.
•The remote controller is water resistant but not water proof. Keep it as dry as possible.
Caution
Regular Maintenance-1
Periodic Inspection
Check
For laundry, newspaper, timber,
oil, spray cans and other
combustible materials. ( p.4 )
Equipment
Remote Controller
Wipe the surface with a wet cloth.
For abnormal sounds
during operation.
For abnormalities in
external appearance,
discoloration or flaws.
For water leaks from the
equipment and piping.
For dust or debris in
the air inlet.
For dust and soot in
the exhaust vent or
exhaust vent terminal.
For proper operation of
pressure relief valve.
Check
Check
Check
Check
Check
Check

14
Periodic Maintenance
If the water drain valve (with water filter) is covered with debris, the hot water may not run
smoothly, or the unit may put out cold water. Check and clean the filter as explained below.
* To avoid burns, wait until the equipment cools down before draining the water.
The appliance will remain hot after it is turned off.
Water Drain Valve (with Water Filter)
1. Close the water supply valve.
2. Open all hot water fixtures.
3. With a bucket ready, remove the inlet and outlet
drain plugs (about 0.2 gal. will drain out)
4. Take the water drain valve (with water filter) out
of the inlet. (See illustration to right).
5. Clean the water drain valve (with water filter) with
a brush under running water.
6. Replace the water drain valve (with water filter)
and close the drain plugs.
(Take care not to lose the packing.)
7. Close all hot water fixtures.
8. Open the water supply valve and check that
water does not leak from the drain plugs or water
drain valve (with water filter). Water Supply
Valve
Inlet
Packing
Regular Maintenance-2
Drain Plug
(with filter)

15
Troubleshooting-1
Initial Operation
Unit does not attempt to ignite
when water is running. • Is water running?
• Check for reversed plumbing or crossed pipes.
• Check the water drain valve filter. ( p.14 )
Unit attempts to ignite but fails
Temperature
Hot water is not available
when a fixture is opened.
•Are the gas and water supply valves fully open?
•If the water supply temperature is high, it is possible
for the temperature to be higher than the temperature
set on the remote controller.
•If only a small amount of hot water is demanded, it is
possible for the temperature to be higher than the
temperature set on the remote controller.
The water is too hot.
•Have you allowed enough time for the cold water in the
pipes to drain out?
Water takes time to become hot
when turning the hot water fixture.
•Are the gas and water supply valves fully open?
•If the amount of hot water required is very high, it is
possible for the temperature to be lower than the temp-
erature set on the remote controller.
Decrease the amount of hot water passing through the unit
and the temperature should stabilize.
The water is not hot enough.
No water is available when
a fixture is opened. •Is the water supply cut off?
•Is the heater frozen?
The hot water is not the correct
temperature. •Is the hot water fixture sufficiently open?
•Reset unit and try again. There may be air in the gas line.
•Have a professional check the gas supply pressure.
•Are the gas and water supply valves fully open?
•Is the water supply cut off?
•Is the hot water fixture sufficiently open?
• Is the gas being cut off by the gas meter?
(Can other gas devices such as stoves be used?)
•(For LP) Is there enough gas in the tank?
(Can other gas devices such as stoves be used?)
•Is the water drain valve filter clogged? ( p.14)
• ( For Units with Optional Remote) Isthe power button turned on?

16
Temperature
Troubleshooting-2
The water is cold when only a
single fixture is open.
Amount of Hot Water
The amount of hot water at a
certain fixture is not constant.
The amount of hot water in the tub
is less/more than the set amount. • When hot water is used for other fixtures while filling the
bath tub, the tub will not fill as much.
• If there is water in the tub already, or when filling is stopped
and restarted, the tub will fill more.
The flow meter alarm does not
sound even when filled to the set
amount.
• The flow meter alarm is set to sound when hot water
is continuously discharged for the set volume of water.
If mixing valves are used, or if cold water is mixed with hot
water at the fixture, the tub will fill more than the setting
of the flow meter alarm.
Amount of hot water available
has decreased over time. • Is the water filter clogged? ( p.14)
•The unit will not heat the water if the flow rate is less than
0.75 gallons per minute.
Open the fixture more or open other fixtures so that a greater
flow passes through the unit, and the unit should begin
heating again.
•When hot water is demanded at other fixtures, the
amount available may be reduced. The maximum flow
available from this unit at a 45°°
°°
°F temp. rise = 6.3 GPM.
•Pressure fluctuations and other plumbing conditions can
cause the temperature and pressure at a fixture to be
unstable, but it should stabilize after a short time.
•Therearesometypesof hot water tapsthat dischargeslarge
volumes of hot water at first but stabilize after time.
•To keep the temperature stable, the heater limits the
amount of water that can flow through it to a small
amount initially, but the amount increases over time.

17
Remote Controller
The water temperature changes
after a power failure or when the
power is disconnected.
The light on the power button
does not come on. • Has there been a power failure?
• Is the power connected properly?
• The temperature setting and the flow meter alarm setting
may both need to be reset after a power outage.
Sounds
The fan can be heard after
operation is stopped.
A motor can be heard when turning
the unit ON or OFF, when opening
or closing a fixture, or after the unit
has been running for a while.
• These noises indicate the proper operation of devices
which are designed to let the unit reignite more quickly,
and ensure the water temperature is stable.
Other
The Heater stops burning during
operation. • Are the gas and water supply valves fully open?
• Is the water supply cut off?
• Is the hot water fixture sufficiently open?
• Is the gas being cut off by the gas meter?
(Can other gas devices such as stoves be used?)
• (For LP) Is there enough gas in the tank?
(Can other gas devices such as stoves be used?)
• This is normal. The white smoke is actually steam.White smoke comes out of the
exhaust vent on a cold day.
The hot water is turbid. • This is harmless. Small bubbles appear as the air in the
water is heated and depressurized rapidly to
atmospheric pressure.
The water appears blue
The bath tub/wash-basin has turned
blue
• Coloration to a blue color may be noticed from small
traces of copper ion contained in the water and fat
(furring). However, there are not problems concerning
health. Coloration of the bath tub/wash-basin can be
prevented by cleaning frequently.

18
Troubleshooting-3
Contact our sales agent if:
• Any other error code appears.
• An error code is indicated again after the above actions were followed.
• There are any other questions.
Lamp Cause Action
ON
OFF
Unit abnormality
If there is a problem with the unit, a lamp will flash on the frout of the unit.
If this occurs, take appropriate measures as listed below.
Flashing
åÃè·ï\é¶Ç Ç®í Ç Ç ÇæÇ Ç¢åÃè·ï\é¶Ç Ç®í Ç Ç ÇæÇ Ç¢
If there is a problem with the unit, a numerical error code will flash on the remote controller.
If this occurs, take appropriate measures as listed below.
When an error code appears, the display and the operation light will flash
together.
Remote Controller
Have a professional check the gas supply pressure.
Contact the nearest sales agent.
Abnormal combustion,
low gas supply pressure
Error Code Cause Action
Ignition error Check whether the gas valve is open. Press the power
button to turn the unit off, open a hot water fixture,
and turn the unit back on. If the flashing number
doesn't return the problem is solved.
Contact the nearest sales agent.Abnormal combustion
Check for an Error Code or Flashing Light on the Unit with optional remote
Check whether the gas valve is open. Close
the hot water fixture, and then open it again.
If the lamp does not begin flashing again, the
problem is solved.

19
A warranty registration card is included separately.
Be sure that the plumber, date of purchase and other necessary items are filled in.
Read the content carefully, and keep the warranty card in a safe place.
For repairs after the warranty period, there will be a charge on any service, and service will only
be performed if the unit is deemed repairable.
Follow-up Service
Requesting Service
Period of Time for Stocking Repair Parts
The manufacturer will stock repair and maintenance parts for this unit for a minimum of seven
years after production has ceased.
Reinstallation
Warranty
First follow the instructions in the troubleshooting section (p.15 to p.18).
If the error is not corrected, contact our sales agent.
If you want to reinstall the appliance at a different location, confirm that the gas and power
supply indicated on the rating plate are available at the new location. If you are not sure,
consult the local utility company.
If you move to a region that uses a different type of gas, conversion and adjustment of the
appliance will be necessary. This work must be performed by a certified service agent and
will be charged for even during the warranty period.
* A request for service may be rejected if the water heater is installed
in a location where working on the unit may be dangerous. Contact a
plumber.
We will need to know:
The Model ................ (check the rating plate)
*See p.4 for the location of the label
Date of purchase ..... (see the warranty)
Details of problem... (flashing error codes,
etc., in much detail as possible)
Your name, address, and telephone number
Desired date of visit

20
Item
Gas Consumption
Maximum Hot Water Capacity
Capacity Range
Temperature Settings
Default Temperature Options
NG : 194,000 btuh, LP : 194,000 btuh
45°F Rise
100-150°F (In 5°F intervals)
Maximum Performance
Minimum Performance
Specification
Indoor/ Outdoor, Wall Hanging
Power Vented
Direct Ignition
15-150 PSI
0.75 GPM
23.6"(Height) x 13.8"(Width) x 9.4"(Depth)
0.2 Gallon
3/4"
3/4"
3/4"
120 VAC (60Hz)
Zincified Steel Plate/Polyester Coating
Stainless Steel
Copper Sheeting, Copper Tubing
Flame Rod, Thermal Fuse, Lightning Protection
Device (ZNR), Electric Leakage Prevention Device
(GFCI), Overheat Prevention Device, Freezing
Prevention Device, Fan Rotation Detector
Specifications
Specifications • Specifications may be changed without prior notice.
• The capacity may differ slightly, depending on the water
pressure, water supply, piping conditions, and water temperature.
Performance
Item
Type
Ignition
Operating Pressure
Minimum Flow Rate
Dimensions
Weight
Water Holding Capacity
Accessories
Installation
Air Supply/Exhaust
Connection Sizes
Power Supply
Materials
Water Inlet
Hot Water Outlet
Gas Inlet
Supply
Consumption
Casing
Flue Collar
Heat Exchanger
Safety Devices
44 lbs.
NG : 65W
LP : 65W
Freeze Prevention 125W
Anchoring Screws
NG : 25,000 btuh, LP : 25,000 btuh
6.3 Gal./min.
0.92-6.3 Gal./min.
120, 130, 140°F
(Original is 120°F)