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.
CERTIFIED
R
Low NOx Approved by SCAQMD
Thank you for purchasing this Noritz Tankless Gas Water Heater. Before using, please:
Read this manual completely for operation instructions.
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.
NORITZ America Corporation
SAR8583-2
Rev. 03/08
*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 |
DANGER indicates an imminently hazardous situation which, |
if not avoided, will result in death or serious injury. |
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WARNING |
WARNING indicates a potentially hazardous situation which, if not |
avoided, could result in death or serious injury. |
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CAUTION |
CAUTION indicates a potentially hazardous situation which, if not |
avoided, may result in minor or moderate injury. |
CAUTION |
CAUTION used without the safety alert symbol indicates a potentially |
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hazardous situation which, if not avoided, may result in property damage. |
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Other icons |
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Electric |
High |
Be sure |
Ground. |
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Shock. |
Temperature. |
to do. |
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Prohibited |
No flame. |
Don’t |
Don’t |
Don’t touch |
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disassemble |
with a wet |
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touch. |
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the equipment. |
hand. |
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DANGER
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: |
Vapors: |
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1. |
Far away from the water |
1. |
Cannot be seen. |
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heater. |
2. |
Vapors are heavier than air. |
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2. |
In approved containers. |
3. |
Go a long way on the floor. |
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3. |
Tightly closed. |
4. |
Can be carried from other rooms |
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4. |
Out of children’s reach. |
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to the main burner by air currents. |
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Hot Water Heater temperatures over 125 °F can cause severe burns instantly or death from scalding.
Prohibited 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.
2 |
(Continued) |
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[N-0631S, N-0531S] |
[N-0631S-OD, N-0531S-OD] |
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Do not use the water heater if |
Do Not Install Indoors. |
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Prohibited the exhaust pipe is displaced, |
Prohibited |
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has holes, is |
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clogged or |
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is corroded. |
This will cause carbon |
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monoxide poisoning and |
Indoor |
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a potential fire hazard. |
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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.
Prohibited
WARNING
A. This water heater does not have a pilot. It is equipped with an ignition device that automatically
No flame. |
lights the burner. Do not try to |
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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.
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When a gas leak is noticed: |
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1. |
Stop use immediately |
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Be sure |
2. |
Close the gas valve |
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to do. |
3. |
[When installing indoors] |
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Open windows and doors |
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If you detect abnormal combustion |
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or abnormal odors, or during an |
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Be sure |
earthquake, tornado or fire: |
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1. |
Turn off the hot water supply |
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to do. |
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2. |
Turn off the power to the water |
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heater |
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3. |
Turn off gas and water supply valve. |
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4. |
Call the nearest Noritz agent |
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Explosion Hazard ;
If the temperature and pressure relief Prohibited 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
High before entering the
Temperature. shower.
Check the temperature before stepping into the bath tub.
(Continued) 3
Important Safety Information-2
(Continued)
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Do not place the exhaust vent terminal |
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in an indoor environment by means of |
Prohibited |
adding walls and ceiling (Do not en- |
close using corrugated sheets, etc.) |
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Exhaust |
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vent terminal |
Outdoor
Unit
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]
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Upper: Min. 36" |
Left side: |
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Min. 6" |
Right side: |
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Min. 6" |
Front:
Sug. 24"
[When installing indoors (N-0631S, N-0531S)]
Sug. 3" from
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Upper: Min. 12" |
vent pipe |
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Left side: Min. 2" |
Right side: |
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Min. 2" |
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Front: Sug. 24"* |
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* Indicates suggested clearances for maintenance. |
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Carbon Monoxide Poisoning Hazard. Do |
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not install this water heater in a mobile |
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Prohibited |
home, recreation vehicle or on a boat. |
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Do not place combustibles such as laundry, newspapers, oils etc. near the
Prohibited heater or the exhaust vent terminal.
Exhaust vent terminal (indoor installation)
Unit
Do not use combustible chemicals such as oil, gasoline, benzene etc.
in the near the heater or the exhaust Prohibited vent terminal.
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 |
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180,000 BTU |
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25,000 BTU |
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177 |
670 |
4.0" |
10.5" |
0.55" |
2.25" |
15 |
150 |
2004 |
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Installation and service must be performed by a qualified installer,
Be sure service agency or the gas supplier.
to do.
[When installing indoors (N-0631S, N-0531S)] Check the air supply
Be sure vent for dust or to do. obstructions.
air supply vent 
If this unit will be installed in a beauty salon or other location where hair
Prohibited spray or aerosols will be used, locate the unit in a seperate area that is supplied with fresh air from outdoors.
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Do not use hair spray or spray detergent in the vicinity of the
Prohibited heater.
Do not allow small children to play unsupervised in the bathroom.
Prohibited Do not allow small children to bathe unsupervised.
Do not touch the power cord with wet hands.
Don’t touch
with a wet Electric hand. Shock.
Consult the nearest Noritz agent if the water heater location needs to
Be sure be changed.
to do.
Contact a qualified service technician for any necessary
Don’t repairs, service or maintenance.
disassemble the equipment.
Contact Noritz before using with a solar pre-heater.
Be sure to do.
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.
CAUTION
Be sure to electrically ground the unit.
Ground.
Keep power cord free of dust.
Be sure to do.
Do not use the water heater for other than hot water supply, shower
Prohibited and bath.
Do not use a broken or modified power cord. Do not bind, bend or
Prohibited 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
Be sure and wait until the equipment cools to do. before performing maintenance.
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.
Do not install in locations where excessive dust or debris will be
Prohibited in the air.
Do not touch the exhaust vent (pipe, terminal) during or immediately after
Don’t operation of the water heater.
touch.
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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.
For single-handle fixtures or valves, discharge water setting the handle completely
to the water side.
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.
Do not use parts other than those specified for this equipment.
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Contents
Important Safety Information ....................................................................... |
2 |
Contents ........................................................................................................ |
7 |
General Parts |
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Main Unit .................................................................................................... |
8 |
Remote Controller .................................................................................... |
9 |
Initial Operation ........................................................................................... |
10 |
How to Use (Not using the remote controller) |
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Setting and Using the Water Heater ........................................................ |
11 |
How to Use (Using the remote controller) |
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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
(Ex. N-0631S)
N-0631S-OD, N-0531S-OD
Outdoor Wall Mounted, Power Vented Model
Exhaust Vent
Front Cover |
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Air Inlet |
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Water Drain Valve (with Water Filter) |
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(Inside Water Inlet) ( p.21) |
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Pressure Relief Valve |
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Water Supply Valve |
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Gas Supply Valve |
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* The above illustration shows an example of installation. |
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The exact installation configuration may be slightly different. |
(Ex. N-0631S-OD) |
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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 |
Setting Buttons |
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When burning, the |
For setting the hot |
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indicator is lit. |
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water temperature, |
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( p.13 and 15) |
the flow meter alarm, |
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and other settings. |
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Priority Indicator |
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When this indicator is lit, |
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the hot water temperature |
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can be set. |
( |
p.12) |
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Temperature Setting |
Power On/Off Button |
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(Ex.: 110°F) |
For turning the |
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heater on and off. |
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Flow Meter Setting |
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The display will flash |
Flow Meter Alarm Set Button |
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after hitting the flow |
For setting the flow |
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meter alarm set button. |
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meter alarm. |
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( |
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p.15) |
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( p.14 - 15) |
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Error Code |
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A number will flash if |
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a failure occurs. |
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( |
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p.25) |
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* Before use, remove the protective sheet from the remote controller surface.
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