Noritz NC250-SV-ASME Installation Manual
NORITZ AMERICA
*SBA8378*
Installation Manual
CORPORATION
TANKLESS GAS WATER HEATER
NC250-SV-ASME (Indoor/Outdoor Installation)
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.
DANGER indicates an imminently hazardous situation which,
DANGER
if not avoided, will result in death or serious injury.
WARNING
CAUTION
WARNING: If the information in this manual is not followed exactly, a fire or explosion may result
causing property damage, personal injury or death.
Prohibited
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.
Disconnect
Power
Ground
Be sure to do
CAUTION
Requests to Installers
• In order to use the water heater safely, read this installation manual carefully, and follow the
installation instructions.
• Failures and damage caused by erroneous work or work not as instructed in this manual are not
covered by the warranty.
• Check that the installation was done properly in accordance with this Installation Manual upon
completion.
•
After completing installation, please either place this Installation Manual in a plastic pouch and
attach it to the side of the water heater (or the inside of the pipe cover or recess box if applicable),
or hand it to the customer to retain for future reference. Also, be sure to fill in all of the required
items on the warranty and to hand the warranty to the customer along with the Owner's Guide.
SBA8378-2
Rev. 03/13
CERTIFIED
R
Complies with
jurisdictions having
40 ng/J or 55 ppm
NOx regulations
(Natural Gas Only)
Installation must conform with local codes, or in the absence
of local codes, the National Fuel Gas Code, ANSI Z223.1/
NFPA 54- latest edition and/or CSA B149.1, Natural Gas and
Propane Installation Code (NSCNGPIC).
Noritz America reserves the right to discontinue, or change
at any time, the designs and/or specifications of its products
without notice.
1.
Included Accessories
The following accessories are included with the unit.
Check for any missing items before starting installation.
Part Shape Q’ty
Anchoring Screw
Remote Controller
(See p. 20)
Heat Exchanger
Inspection report
2.
Optional Accessories
System Controller
5
1
1
1
Owner's Guide, Warranty,
Installation Manual
(this document)
Remote Controller
Cord (10ft)
The accessories listed below are not
included with the units, but may be necessary
for installation.
Outdoor Vent Cap
(VC4(-1))
Quick Connect Cord
Q’tyShapePart
1
each
1
Q’tyShapePartPart Shape Q’ty
1
1
Isolation Valves
(includes pressure
relief valve)
Remote Controller
Outdoor
Junction Box
Remote Controller
1
1
Cord (26ft)
Pipe Cover
(PC-3S-SUS)
1
1
2
3.
Quick Connect Multi System Installation
• The Quick Connect Multi System allows the installation of two units together utilizing only the Quick
Connect Cord.
The Quick Connect Cord is 6 ft. long. Install the units 6-19" apart from each other to ensure the
cord will be able to reach between the units. (See Typical Plumbing diagram).
(If the distance between the two units is too great, not only will the cord not be able to reach,
but the water temperature may also become unstable because of the difference in pipe length
between the two units).
System Diagram
Quick Connect
Cord
Cord
Connector
Typical Plumbing
Cord
Connector
Terminal Block
Remote Controller
Remote Controller Cord
G
Distance at center: 24.3-37.4 in.
Distance on sides
6-19 in.
* When connecting two units, use only a
single remote controller.
Note: Connect the remote
controller to only one
of the units.
Gas Supply Piping
Cold Water Supply
Hot Water
Union
Union
Gas Valve
Shutoff Valve
Shutoff
Valve
Hot Water
Cold Water
Size the piping to allow for the maximum
flow rates of the units.
Make this distance as short as possible.
* The hot water temperature will
become unstable as the pipe
length increases.
Union
Quick Connect
cord
Pressure
Relief
Valve
Shutoff
Valve
Leave enough clearance around the plumbing to
apply insulation. It will be necessary to add
bends to the piping to ensure that this clearance
is available.
• Insulate the hot water piping to prevent heat loss. Insulate and apply heating materials to the cold
water supply piping to prevent heat loss and freezing of pipes when exposed to excessively cold
temperatures.
3
Before Installation
4.
DANGER
Checkup
• Check the fixing brackets and vent pipe yearly for damage or wear. Replace if necessary.
WARNING
Check the Gas
• Check that the rating plate indicates the
correct type of gas.
• Check that the gas supply line is sized for
250,000 Btuh for this unit.
Check the Power
• The power supply required is 120VAC, at 60Hz.
May result in fire or electric shock.
Use Extreme Caution if Using With a Solar Pre-Heater
• Using this unit with a solar pre-heater can lead to unpredictable output temperatures and
possibly scalding. If absolutely necessary, use mixing valves to ensure output temperatures do
not get to scalding levels. Do not use a solar pre-heater with the quick-connect multi-system.
CAUTION
Do Not Use Equipment for Purposes Other Than Those Specified
• Do not use for other than increasing the temperature of the water supply, as unexpected accidents
may occur as a result.
Check Water Supply Quality
• 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.
4
Choosing Installation Site
5.
* Locate the appliance in an area where leakage from the unit or connections will not result in damage
to the area adjacent to the appliance or to the lower floors of the structure. When such locations
cannot be avoided, it is recommended that a suitable drain pan, adequately drained, be installed
under the appliance. The pan must not restrict combustion air flow.
DANGER
• Install the exhaust vent so that there are no obstacles around the termination and so that
exhaust can't accumulate. Do not enclose the termination with corrugated metal or other
materials.
WARNING
• Avoid places where fires are common, such as those where gasoline,
benzene and adhesives are handled, or places in which corrosive gases
(ammonia, chlorine, sulfur, ethylene compounds, acids) are present.
Using the incorrect voltage may result in fire or cracking.
• Avoid installation in places where dust or debris will accumulate.
Dust may block the air-supply opening, causing the performance of the
device fan to drop and incomplete combustion to occur as a result.
Prohibited
• Avoid installation in places where special chemical agents
(e.g., hair spray or spray detergent) are used.
Ignition failures and malfunction may occur as a result.
• Carbon Monoxide Poisoning Hazard. Do not install this water heater in a
mobile home, recreation vehicle or on a boat.
CAUTION
• Install the water heater in a location where it is free from obstacles and stagnant air.
• Consult with the customer concerning the location of installation.
• Do not install the water heater near staircases or emergency exits.
• Do not install the water heater where the exhaust will blow on outer walls
or material not resistant to heat. Also consider the surrounding trees and
animals.
The heat and moisture from the water heater may cause discoloration of
walls and resinous materials, or corrosion of aluminum materials.
• Do not locate the vent termination directed towards a window or any other
structure which has glass or wired glass facing the termination.
5
CAUTION
• Avoid installation above gas ranges or stoves.
• Avoid installation between the kitchen fan and stove. If oily
fumes or a large amount of steam are present in the installation
location, take measures to prevent the fumes and steam from
entering in the equipment.
• Install in a location where the exhaust gas flow will not be
affected by fans or range hoods.
• Take care that noise and exhaust gas will not affect neighbors.
Avoid installation on common walls as the unit will make some
operational noises while it is running.
• Make sure that the location allows installation of the exhaust
vent as specified.
• For outdoor installation, use the outdoor vent cap.
If it is necessary to vent above the roof line in an outdoor installation, use high temperature sealant around the flue collar for
rain protection.
• Avoid installation where the unit will be exposed to excessive
winds.
• Before installing, make sure that the vent termination (or the vent
cap in an outdoor installation) will have the proper clearances
according to the National Fuel Gas Code (ANSI Z223.1).
Prohibited
Be sure to do
Prohibited
State of California: The water heater must be braced, anchored or strapped to avoid moving during an
earthquake. Contact local utilities for code requirements in your area or call: 1-866-766-7489 and request
instructions.
The Commonwealth of Massachusetts: The water heater can be used for hot water only and not in a
combination of domestic and space heating.
For Venting Manufacturers Requirements, see websites or phone numbers listed below:
Noritz N-Vent www.noritz.com
6
6. Installation Clearances
WARNING
Before installing, check for the following:
Install in accordance with relevant building and mechanical codes, as well as any local, state or
national regulations, or in the absence of local and state codes, to the National Fuel Gas Code ANSI
Z223.1/NFPA 54 – latest edition. In Canada, see NSCNGPIC for detailed requirements.
Item
• Maintain the following clearance from
both combustible and non-combustible
materials.
From Heater
Required Clearances
• If the unit will be installed in the vicinity of a
permanent kitchen range or stove that has
the possibility of generating steam that
contains fats or oils, use a dividing plate or
other measure to ensure that the unit is not
exposed to air containing such impurities.
* The dividing plate should be of noncombust-
ible material of a width greater than the
Cooking Equipment
water heater.
Check Illustration
6" or more (Indoor/Outdoor)
Exhaust hood
Dividing plate
Range
12" or more(Indoor)
36" or more(Outdoor)
4" or more(Indoor)
24" or more(Outdoor)
Water
heater
• If possible, leave 8" or more on either
side of the unit to facilitate inspection.
• If possible, leave 24" or more in front of
the unit to facilitate maintenance
and service if necessary.
• If possible, leave 3" or more above and
below the vent pipe to facilitate inspection and repair if necessary
repair/inspection
Securing of space for
8" or
more
24" or
more
8" or
more
3"
or more
3"
or more
(unit: inch)
7
Clearance Requirements from Vent Terminations to Building Openings
* All clearance requirements are in accordance with ANSI Z21.10.3 and the National Fuel Gas Code,
ANSI Z223.1 and in Canada, in accordance with NSCNGPIC.
D
E
L
B
DescriptionRef
Clearance above grade, veranda, porch,
A=
deck, or balcony
Clearance to window or door that may
B=
be opened
C=
Clearance to permanently closed window
Vertical clearance to ventilated soffit
located above the terminal within a
D=
horizontal distance of 2 feet (61 cm)
from the center line of the terminal
E=
Clearance to unventilated soffit
Clearance to outside corner
F=
G=
Clearance to inside corner
Clearance to each side of center line
H=
extended above meter/regulator assembly
I=
Clearance to service regulator vent outlet
Clearance to nonmechanical air supply
J=
inlet to building or the combustion air inlet
to any other appliance
Clearance to a mechanical air supply inlet
K=
Clearance above paved sidewalk or paved
L=
driveway located on public property
Clearance under veranda, porch, deck,
M=
or balcony
1
In accordance with the current CSA B149.1 Natural Gas and Propane Installation Code
2
In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Gas Code
† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single
family dwellings and serves both dwellings.
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
* Clearance in accordance with local installation codes and the requirements of the gas supplier.
Clearance to opposite wall is 24 inches (60 cm).
C
F
B
G
A
B
B
B
B
J
A
Vent T erminal
Air Supply Inlet
Canadian Non-Direct Vent
Installations
12 in (30 cm)
36 in (91 cm)
3 ft (91 cm) within a height
15 ft (4.5 m) above the
meter/regulator assembly
3 ft (91 cm)
36 in (91 cm)
6 ft (1.83 m)
7 ft (2.13 m)†
12 in (30 cm)‡
1
*
*
*
*
*
H
I
M
K
Area Where Terminal
is Not Permitted
US Non-Direct Vent
Installations
12 in (30 cm)
4 ft (1.2 m) below or to side
of opening; 1 ft (30 cm)
above opening
4 ft (1.2 m) below or to side
of opening; 1 ft (30 cm)
above opening
3 ft (91 cm) above if within
10 ft (3 m) horizontally
2
*
*
*
*
*
*
*
*
*
8
7. Installation
Securing to the wall
• The weight of the device will be applied to the wall. If the strength of the wall is not sufficient, reinforcement must be done to prevent the transfer of vibration.
• Do not drop or apply unnecessary force to the device when installing. Internal parts may
Be sure to do
be damaged and may become highly dangerous.
• Install the unit on a vertical wall and ensure that it is level.
Item
Check
CAUTION
• When installing with bare hands, take caution to
not inflict injury.
• Be careful not to hit electrical wiring, gas, or water
piping while drilling holes.
1. Drill a single screw hole, making sure to hit a stud.
2. Insert and tighten the screw and hang the unit by
the upper wall mounting bracket.
Locating Screw Holes
3. Determine the positions for the remaining four screws
(two for the top bracket and two for the bottom), and
remove the unit.
4. Drill holes for the remaining four screws.
5. Hang the unit again by the first screw, and then
insert and tighten the remaining four screws.
6. Take waterproofing measures so that water does
not enter the building from screws mounting the
Mounting
device.
Illustration
Location of Screw Hole
Mounting Bracket
(upper)
Locating Screw Holes
Anchoring Screw
• Make sure the unit is installed securely so that it will
not fall or move due to vibrations or earthquakes.
Structure
• If this water heater is being installed at an elevation of
2,000 ft. (610m) or higher, disconnect the connector
labeled "High Elevation Disconnect" as illustrated on
the right. This connector is located inside the unit.
• Disconnect power to the water heater before disconnecting this connector. Failure to perform this step will
result in a "73" code displayed on the remote controller
and a cease in operation. If this occurs, disconnect,
Above 2,000 ft.
then reconnect power to the water heater to reset the
system.
Installations at Elevations
DISCONNECT
HIGH ELEVATION
9
Vent Pipe Installation
8.
Be sure to do
(Indoor Installation Only)
WARNING
CARBON MONOXIDE POISONING
Follow all vent system requirements in accordance with relevant local or state regulation,
or, in the absence of local or state code, in the U.S. to the National Fuel Gas Code ANSI
Z233.1/NFPA 54 – latest edition, and in Canada, in accordance with NSCNGPI.
• Exhaust the exhaust air outdoors using the separately available member for exhaust.
• Be sure to install the exhaust vent top so that it leads to outdoors.
Vent Piping
• Noritz N-Vent is suggested for the vent system.
If N-Vent is not used, a UL listed category III vent
system must be used.
• Follow the vent pipe manufacturer's installation
instructions.
Pipe diameter 4"
No. of Elbows
3 15'
2 27'
1 39'
* Not including the termination.
• Make the vertical section of the exhaust vent
as short as possible.
• Maintain the same vent pipe diameter from the
heater flue to the vent termination.
Clearances
Manufacturer and Enclosed Unenclosed
Product Hor. Vert. Hor. Vert.
Noritz N-Vent 4" 1" 1"
Clearances vary by manufacturer, refer to the UL
approved clearances when using materials other
than N-Vent.
Max. Straight Vent Length*
10" (sides)
15"(top)
6"(bottom)
• The first vertical run from the top of the heater
should be no longer than 3'.
• Make sure vent pipe is gas tight and will not
leak. Use silicon sealant wherever necessary.
• Do not common vent or connect more than
one appliance to this venting system.
• The total vent length including horizontal &
vertical vent runs should be no less than 3'.
• Do not store hazardous or flammable substances near the vent termination and check
that the termination is not blocked in any way.
• Steam or condensed water may come out
from the vent termination. Select the location
for the termination so as to prevent injury or
property damage.
• If snow is expected to accumulate, take care
the end of the pipe is not covered with snow or
hit by falling lumps of snow.
• Consult the vent pipe manufacturer's installation instructions for chimney connections.
Appliance Adapters
When using a vent system other than N-Vent,
an appliance adapter will be required to properly
connect the vent to this appliance. Consult the
manufacturer's instructions for the proper appliance adapter.
10
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