Noritz N-0631S, N-0631S-OD, N-0531S, N-0531S-OD Owner's Guide
TANKLESS GAS WATER HEATER
Owner’s Guide
Model N-0631S
N-0631S-OD
N-0531S
N-0531S-OD
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.
Thank you for purchasing this Noritz Tankless Gas Water Heater.
Before using, please:
Read this manual completely for operation instructions.
CERTIFIED
R
Low NOx
Approved by
SCAQMD
Completely fill out the warranty registration card (included separately) and
mail the detachable portion to Noritz America Corporation.
Keep this manual (and the remainder of the warranty registration card) where it
can be found whenever necessary.
Installation must conform with local codes, or in the absence of local codes,
the National Fuel Gas Code, ANSI Z223.1/NFPA 54.
Noritz America reserves the right to discontinue, or change at any time, the
designs and/or specifications of its products without notice.
SAR8583-2
Rev. 03/08
NORITZ America Corporation
*SAR8583 T*
Important Safety Information-1
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 four
categories. Closely observe these warnings; they are critical to your safety.
Icons warning of risk level
This is the 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
Other icons
Electric
Shock.
Prohibited
Vapors from flammable liquids will explode and catch fire causing death or severe burns.
Do not use or store flammable products such as gasoline, solvents or
Prohibited
adhesives in the same room or area near the water heater.
Keep flammable products:
1. Far away from the water
heater.
2. In approved containers.
3. Tightly closed.
4. Out of children’s reach.
DANGER indicates an imminently hazardous situation which,
if not avoided, will result in death or serious injury.
WARNING indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.
CAUTION indicates a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury.
CAUTION used without the safety alert symbol indicates a potentially
hazardous situation which, if not avoided, may result in property damage.
High
Temperature.
No flame.
Be sure
to do.
Don’t
touch.
Ground.
Don’t
disassemble
the equipment.
Don’t touch
with a wet
hand.
DANGER
Vapors:
1. Cannot be seen.
2. Vapors are heavier than air.
3. Go a long way on the floor.
4. Can be carried from other rooms
to the main burner by air currents.
2
Prohibited
Hot Water Heater temperatures over 125 °F can cause severe burns instantly or
death from scalding.
Children, disabled and elderly are at the highest risk of being scalded.
Feel water temperature before bathing or showering.
Temperature limiting valves are available, ask professional person.
(Continued)
(Continued)
Prohibited
[N-0631S, N-0531S]
Do not use the water heater if
the exhaust pipe is displaced,
has holes, is
clogged or
is corroded.
Prohibited
[N-0631S-OD, N-0531S-OD]
Do Not Install Indoors.
This will cause carbon
monoxide poisoning and
a potential fire hazard.
Indoor
Prohibited
No flame.
Do not allow anyone to change the water temperature while hot water is being used
To prevent scalding, do not change the water temperature to a higher setting.
.
WARNING
A. This water heater does not have a
pilot. It is equipped with an
ignition device that automatically
lights the burner. Do not try to
light the burner by hand.
B.
BEFORE OPERATING smell all
around the water heater area for
evidence of leaking gas. Be sure to
smell next to the floor because
some gas is heavier than air and will
settle on the floor.
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.
C. Use only your hand to turn the gas
valve knob. Never use tools. If the
knob will not turn by hand, don’t
try to repair it. Call a qualified
service technician. Force or
attempted repair may result in a
fire or explosion.
D. Do not use this water heater if any
part has been under water.
lmmediately call a qualified
service technician to inspect the
water heater and to replace any
damaged parts.
Be sure
Be sure
Prohibited
Temperature.
When a gas leak is noticed:
1. Stop use immediately
2. Close the gas valve
to do.
3. [When installing indoors]
Open windows and doors
If you detect abnormal combustion
or abnormal odors, or during an
earthquake, tornado or fire:
to do.
1. Turn off the hot water supply
2. Turn off the power to the water
heater
3.
Turn off gas and water supply valve.
4. Call the nearest Noritz agent
Explosion Hazard ;
If the temperature and pressure relief
valve is dripping or leaking, have a
qualified service technician replace it.
Do not plug or remove the valve.
Failure to follow these instructions can result
in fire or explosion, and personal injury or
death
Check the temperature
of the running hot water
before entering the
High
shower.
Check the temperature
before stepping into
the bath tub.
(Continued)
3
Important Safety Information-2
180,000 BTU
25,000 BTU
177
4.0"
0.55"
2.25"
10.5"
670
N-0631S
(Continued)
Do not use combustible chemicals
such as oil, gasoline, benzene etc.
in the near the heater or the exhaust
vent terminal.
Prohibited
Do not place the exhaust vent terminal
in an indoor environment by means of
adding walls and ceiling (Do not enclose using corrugated sheets, etc.)
Prohibited
Carbon monoxide poisoning or fire may
occur as a result.
Leave the proper clearance between
the water heater and nearby objects
Be sure
(trees, timber, boxes with flammable
to do.
materials etc.).
[When installing outdoors]
Left side:
Min. 6"
Front:
Sug. 24"
[When installing indoors (N-0631S, N-0531S)]
Left side: Min. 2"
Front: Sug. 24"
Indicates suggested clearances for maintenance.
*
Upper:
Min. 12"
*
Exhaust
vent terminal
Outdoor
Unit
Upper: Min. 36"
Right side:
Min. 6"
Sug. 3" from
vent pipe
Right side:
Min. 2"
Do not store or use gasoline or
other flammable vapors and liquids
Prohibited
in the vicinity of this or any other
appliance.
Do not place or use a spray can
near the heater or the exhaust vent
Prohibited
terminal.
Be sure the gas/power
supplied matches the
Be sure
gas on the rating plate.
to do.
Ex. For Natural Gas N-0631S
N-0631S
2004
Installation and service must be
performed by a qualified installer,
Be sure
service agency or the gas supplier.
to do.
180,000 BTU
25,000 BTU
180,000
148,000
2.4
177
4.0"
0.55"
15 150
670
10.5"
2.25"
173,600
142,000
2.4
4
Prohibited
Prohibited
Carbon Monoxide Poisoning Hazard. Do
not install this water heater in a mobile
home, recreation vehicle or on a boat.
Do not place combustibles such as
laundry, newspapers, oils etc. near the
heater or the exhaust vent terminal.
Exhaust vent terminal
(indoor installation)
Unit
Be sure
to do.
Prohibited
[When installing indoors (N-0631S, N-0531S)]
Check the air supply
vent for dust or
obstructions.
air supply
vent
If this unit will be installed in a beauty
salon or other location where hair
spray or aerosols will be used, locate
the unit in a seperate area that is
supplied with fresh air from outdoors.
(Continued)
(Continued)
Prohibited
Prohibited
Do not use hair spray or spray
detergent in the vicinity of the
heater.
Do not allow small children to play
unsupervised in the bathroom.
Do not allow small children to
bathe unsupervised.
Don’t
disassemble
the equipment.
Be sure
to do.
Contact a qualified service
technician for any necessary
repairs, service or maintenance.
Contact Noritz before using with
a solar pre-heater.
Don’t touch
with a wet
hand.
Be sure
to do.
Ground.
Be sure
to do.
Do not touch the power
cord with wet hands.
Electric
Shock.
Consult the nearest Noritz agent if
the water heater location needs to
be changed.
CAUTION
Be sure to electrically ground the
unit.
Keep power cord free of dust.
California Proposition 65 lists chemical
substances known to the state to cause
cancer, birth defects, death, serious illness
or other reproductive harm. This product
may contain such substances, be their
origin from fuel combustion (gas, oil) or
components of the product itself.
Do not turn off the water heater
while someone is bathing.
Prohibited
Do not cover the water heater and
the exhaust vent terminal, store
Prohibited
trash or debris near it, or in any way
block the flow of fresh air to the unit.
Prohibited
Prohibited
Be sure
to do.
Do not use the water heater for
other than hot water supply, shower
and bath.
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.
To prevent burns or scalding, turn
off the power button or power supply
and wait until the equipment cools
before performing maintenance.
Prohibited
Don’t
touch.
Do not install in locations where
excessive dust or debris will be
in the air.
Do not touch the exhaust vent (pipe,
terminal) during or immediately after
operation of the water heater.
5
Important Safety Information-3
CAUTION
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.
If the water supply is in excess of 12 grains
per gallon (200 mg/L) of hardness, acidic or
otherwise impure, treat the water with
approved methods in order to ensure full
warranty coverage.
Problems resulting from scale formation
are not covered by the warranty.
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.
This unit is only approved for installation
up to 4500 ft. above sea level.
For installations at higher elevations, contact Noritz
America for Instructions.
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.18)
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.19)
If it is snowing, check the air inlet, exhaust
gas vent and exhaust vent terminal for
blockage.
6
For single-handle fixtures or valves, discharge
water setting the handle completely
to the water side.
Do not use parts other than those specified
for this equipment.
Contents
Important Safety Information....................................................................... 2
Contents ........................................................................................................ 7
General Parts
Main Unit.................................................................................................... 8
Remote Controller .................................................................................... 9
Initial Operation ........................................................................................... 10
How to Use (Not using the remote controller)
Setting and Using the Water Heater........................................................ 11
How to Use (Using the remote controller)
Setting and Using the Water Heater........................................................ 12
Flow Meter Alarm ...................................................................................... 14
Muting the Remote Controller ................................................................. 16
Adjusting the Maximum Output Temperature........................................ 17
Preventing Damage from Freezing ............................................................ 18
Regular Maintenance................................................................................... 20
Troubleshooting .......................................................................................... 22
Follow-up Service ........................................................................................ 26
Specifications .............................................................................................. 27
7
General Parts
Main Unit
N-0631S, N-0531S
Indoor/Outdoor Wall Mounted, Power Vented Model
Flue Collar
Front Cover
Air Inlet
Water Drain Valve (with Water Filter)
(Inside Water Inlet) ( p.21)
Pressure Relief Valve
Water Supply Valve
Gas Supply Valve
N-0631S-OD, N-0531S-OD
Outdoor Wall Mounted, Power Vented Model
Exhaust Vent
Front Cover
Air Inlet
Water Drain Valve (with Water Filter)
(Inside Water Inlet) ( p.21)
Pressure Relief Valve
Water Supply Valve
(Ex. N-0631S)
8
Gas Supply Valve
* The above illustration shows an example of installation.
The exact installation configuration may be slightly different.
(Ex. N-0631S-OD)
Remote Controller (RC-7649M) <Optional>
The illustration below shows the remote controller display. What is actually displayed
depends on how the water heater is set.
Burner On Indicator
When burning, the
indicator is lit.
( p.13 and 15)
Priority Indicator
When this indicator is lit,
the hot water temperature
can be set. ( p.12)
Temperature Setting
(Ex.: 110°F)
Flow Meter Setting
The display will flash
after hitting the flow
meter alarm set button.
( p.15)
Error Code
A number will flash if
a failure occurs.
( p.25)
Setting Buttons
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.
( p.14 - 15)
* Before use, remove the protective sheet from the remote controller surface.
9
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