Noritz America NC250-SV-ASME, NC250-DV-ASME Installation Manual
TANKLESS GAS WATER HEATER
*SBA8377*
Owner’s Guide
Models : NC250-SV-ASME
NC250-DV-ASME
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:
CERTIFIED
R
Low NOx
Approved by
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.
SCAQMD
Accepted For Use
City of New York
Department of Buildings
MEA 19-03-E
SBA8377
Rev. 09/09
NORITZ America Corporation
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
Prohibited
[NC250-SV-ASME only]
Do not use the water heater if
the exhaust pipe is displaced,
has holes, is clogged or is
corroded.
Prohibited
[NC250-DV-ASME only]
Do not use the water heater if
the intake/exhaust pipe is displaced,
has holes, is clogged
or is corroded.
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
No flame.
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
to do.
Be sure
to do.
Prohibited
High
Temperature.
Prohibited
When a gas leak is noticed:
1. Stop use immediately
2. Close the gas valve
3. [When installing indoors]
Open windows and doors
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 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 shower.
Check the temperature
before stepping into
the bath tub.
Carbon Monoxide Poisoning
Hazard. Do not install this water
heater in a mobile home, recreation
vehicle or on a boat.
(Continued)
3
Important Safety Information-2
(Continued)
WARNING
Prohibited
Be sure
to do.
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.)
Exhaust vent
terminal
Flue terminal
Unit
Carbon monoxide poisoning or fire may
occur as a result.
Prohibited
Flue
terminal
Leave the proper clearance between the
water heater and nearby objects (trees,
timber, boxes with flammable materials etc.).
[When installing outdoors (NC250-SV-ASME)]
Min. 36"
Upper:
Left side:
Min. 6"
Front:
Sug. 24"
[When installing indoors (NC250-SV-ASME)]
Upper: Min. 12"
Left side:
Min. 6"
Front:
Sug. 24"
[When installing indoors (NC250-DV-ASME only)]
Upper: Min. 12"
Left side:
Min. 6"
Front:
Sug. 24"
Indicates suggested clearances for maintenance.
*
*
*
Right side:
Min. 6"
Sug. 3" from
vent pipe*
Right side:
Min. 6"
Sug. 3" from
vent pipe*
Right side:
Min. 6"
Prohibited
Prohibited
Be sure
to do.
Ex. For Natural Gas (NC250-SV-ASME)
[NC250-DV-ASME only]
Do not place outdoors
Rain may enter the unit or the burner
fire may be blown by the wind, causing malfunction or fire as a result.
Outdoor
Be sure
to do.
Do not place combustibles such as
laundry, newspapers, oils etc.
near the heater or the exhaust vent
terminal.
Exhaust vent terminal
(indoor installation)
Unit
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
Do not place or use a spray can
near the water heater or the exhaust
vent terminal.
Be sure the gas/power
supplied matches the
gas on the rating plate.
NC250-SV-ASME
[When installing indoors
(NC250-SV-ASME only)]
Check the air supply
vent for dust or
obstructions.
air supply
vent
4
Prohibited
Do not use combustible chemicals
such as oil, gasoline, benzene etc.
in the near the heater or the exhaust
vent terminal.
Be sure
to do.
Installation and service must be
performed by a qualified installer,
service agency or the gas supplier.
(Continued)
(Continued)
Prohibited
Prohibited
Prohibited
Don’t touch
with a wet
hand.
Be sure
to do.
Be sure
to do.
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.
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.
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.
Contact Noritz before using with
a solar pre-heater.
Contact a qualified service
technician for any necessary
repairs, service or maintenance.
Don’t
disassemble
the equipment.
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.
The gas conversion kit shall be installed by
a qualified service agency in accordance
with the manufacturer’s instructions and all
applicable codes and requirements of the
authority having jurisdiction.
The information in the instructions must be
followed to minimize the risk of fire or
explosion or to prevent property damage,
personal injury, or death. The qualified
service agency is responsible for the proper
installation of this kit.
The installation is not
proper and complete until the operation of
the converted appliance is checked as
specified in the manufacturer’s instructions
supplied with the kit.
Ground.
Be sure
to do.
Prohibited
Prohibited
Be sure
to do.
CAUTION
Be sure to electrically ground the
unit.
Prohibited
Keep power cord free of dust.
Prohibited
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 and wait until
the equipment cools before performing maintenance.
Prohibited
Don’t
touch.
Do not turn off the water heater
while someone is bathing.
Do not cover the water heater and
the exhaust vent terminal, store
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
in the air.
Do not touch the exhaust vent pipe and
exhaust vent terminal during or immediately
after operation of the water heater.
(NC250-SV-ASME)
(NC250-DV-ASME)
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.
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 (
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. (
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.
p.18)
p.17)
6
Contents
Important Safety Information....................................................................... 2
Contents ........................................................................................................ 7
General Parts
Main Unit.................................................................................................... 8
Remote Controller .................................................................................... 9
Initial Operation ........................................................................................... 10
How to Use
Muting the Remote Controller ................................................................. 11
Setting and Using the Water Heater........................................................ 12
Flow Meter Alarm ...................................................................................... 14
Adjusting the Maximum Output Temperature........................................ 16
Preventing Damage from Freezing ............................................................ 17
Regular Maintenance................................................................................... 19
Troubleshooting .......................................................................................... 21
Follow-up Service ........................................................................................ 26
Specifications .............................................................................................. 28
7
General Parts
Main Unit
NC250-SV-ASME (Indoor/Outdoor Wall Mounted, Power Vented Model)
Flue Collar
Front Cover
Air Inlet
Water Drain Valve (with Water Filter)
(Inside Water Inlet) (
Pressure Relief Valve
p.20)
Water Supply Valve
Gas Supply Valve
NC250-DV-ASME (Indoor Wall Mounted, Power Vent/Sealed Model)
Flue Collar
Intake pipe
Front Cover
Water Drain Valve (with Water Filter)
(Inside Water Inlet) (
Pressure Relief Valve
Water Supply Valve
p.20)
8
Gas Supply Valve
* The above illustration shows an example of installation.
The exact installation configuration may be slightly different.
Remote Controller (RC-7649M)
What is actually displayed depends on how the water heater is set.
Burner On Indicator
When burning, the
indicator is lit.
(
Priority Indicator
When this indicator is lit,
the hot water temperature
can be set. (
Temperature Setting
Flow Meter Setting
The display will flash
after hitting the flow
meter alarm set button.
A number will flash if
a failure occurs.
p.13 and 15)
(Ex.: 110°F)
(
Error Code
(
p.12)
p.15)
p.24)
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
Initial Operation
Before the first use of your water heater, make the following preparations.
Follow steps 1 through 4.
Open the water supply valve.
1
CLOSED
Open a hot water fixture to confirm that
water is available, and then close the
2
fixture again.
Hot water fixture
OPEN
10
Open the gas supply valve.
3
Turn on the power.
4
Do not touch with wet hands.
(Ex. NC250-SV-ASME)
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