NORITZ AMERICA NRC663-FSV User manual

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.
Prohibited Disconnect
Power Ground Be sure to do
WARNING: If the information in this manual is not followed exactly, a re or explosion may result
causing property damage, personal injury or death.
NORITZ AMERICA
CORPORATION
Installation Manual
CONDENSING TANKLESS GAS WATER HEATER
NRC663-FSV (EZTR40)
(Indoor Installation)
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.
DANGER
WARNING
CAUTION
SBB809L-01
Rev. 01/17
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 ll in all of the required
items on the warranty and to hand the warranty to the customer along with the Owner's Guide.
CAUTION
FOR USE IN RESIDENTIAL APPLICATIONS.
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.
Noritz America reserves the right to discontinue, or change at any
time, the designs and/or specifications of its products without
notice.
Low NOx
Approved by
SCAQMD
14 ng/J or 20 ppm
(Natural Gas Only)

2
1.
Included Accessories
The following accessories are included with the unit.
Check for any missing items before starting installation.
Q’ty
ShapePart
Anchoring Screw 1
each
Part Shape Q’ty
5
1
Remote Controller
(See p. 28) Remote Controller
Cord (10ft (3m))
1
2.
Optional Accessories
The accessories listed below are not
included with the units, but may be necessary
for installation.
Q’ty
ShapePartPart Shape Q’ty
Remote Controller
Cord (26ft (8m)) 1
1
each
Isolation Valves*
(includes pressure
relief valve)
Owner's Guide, Warranty,
Installation Manual
(this document)
1
1
Flex Vent 2" Kit
25 Feet
(EZ2FVK-1)
Flex Vent 2" Kit
35 Feet
(EZ2FVK-2)
Note: Additional vent pieces are available; consult the latest product catalogue for details.
1
Neutralizer
(NC-1)
* Isolation valves are necessary for ushing the Heat Exchanger.
They allow for easy ushing of the system.

3
Check the Gas
• Check that the rating plate indicates the
correct type of gas.
• Check that the gas supply line is sized for
120,000 Btuh.
Check the Power
• The power supply required is 120VAC, at 60Hz.
Using the incorrect voltage may result in re 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.
3. Before Installation
Checkup
• Check the xing brackets and vent pipe yearly for damage or wear. Replace if necessary.
DANGER
Do Not Use Equipment for Purposes Other Than Those Specied
• 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.
WARNING
CAUTION
Precautions on Vent Pipe Replacement
• The vent system will almost certainly need to be replaced when this appliance is being installed.
Only use vent materials that are specied in this Installation Manual for use on this appliance.
Refer to the "Vent Pipe Installation" section for details. If the exible polypropylene pipe is already
installed, replace to the new exible polypropylene pipe.
Improper venting may result in res, property damage or exposure to Carbon Monoxide.
Snow Precaution
• If this product will be installed in an area where snow is known to accumulate, protect the vent
termination from blockage by snow drifts or damage from snow falling off of roofs.

4
4. Choosing Installation Site
* 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 oors of the structure. When such locations
cannot be avoided, it is required that a suitable drain pan, adequately drained, be installed under the
appliance. The pan must not restrict combustion air ow.
* As with any water heating appliance, the potential for leakage at some time in the life of the product
does exist. The manufacturer will not be responsible for any water damage that may occur.
• Locate the vent terminal 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.
• Avoid places where res 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 re 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.
• 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, recreational
vehicle or on a boat.
• The manufacturer does not recommend installing the water heater in an attic due to safety issues.
If you install the water heater in an attic:
• Make sure the unit will have enough combustion air and proper ventilation.
• Keep the area around the water heater clean. When dust collects on the ame sensor, the
water heater will shut down on an error code.
• Place the unit for easy access for service and maintenance.
• A drain pan, or other means of protection against water damage, is required to be installed
under the water heater in case of leaks.
• The water heater is designed for indoor installation only. Never install it
outdoors or in a bathroom, it may be damaged or a re may be caused.
• Consult with the customer concerning the location of installation.
• Install the water heater in an area that allows for the proper clearances
to combustible and noncombustible construction. Consult the rating
plate on the appliance for proper clearances.
DANGER
WARNING
CAUTION
Prohibited

5
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.
Be sure to do
Prohibited
CAUTION
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 listed below:
Flex Vent 2" Kit www.noritz.com
http://support.noritz.com/
• Do not install the water heater in a place where it may be
threatened by falling objects, such as under shelves.
• Do not install the water heater in a place where the inside/
outside temperature is below 32°F (0°C).
• The water heater must be installed in a place where exhaust
pipes can be installed as directed.
• 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.
• 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 ow 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 specied.
• Avoid installation where the exhaust vent terminal will be exposed
to excessive winds.
• Before installing, make sure that the exhaust ue termination will
have the proper clearances according to the National Fuel Gas
Code (ANSI Z223.1 - Latest edition).

6
5. Installation Clearances
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 for detailed requirements.
WARNING
Item
Distance from combustibles
• Maintain the following clearances
from both combustible and
non-combustible materials.
Check Illustration
In order to facilitate inspection and repair it
is recommended to leave:
•
8" (200mm) or more on either side of the unit
• 24" (600mm) or more in front of the unit
• 3" (75mm) or more above and below the vent pipe
Securing of space for
repair/inspection
24" (600mm)
or more
Distance from the side
3" (75mm) or more
4" (100mm) or more
3" (75mm) or more
8" (200mm)
or more
8" (200mm)
or more
<When the indoor air supply>
• 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 non-combustible
material of a width greater than the water
heater.
Exhaust hood
Range
Dividing plate Water
heater
Cooking Equipment
▲The illustration is an example. Please check with the actual water heater about the position of piping, and form.
3" (75mm) or more
12" (300mm)
or more

7
DescriptionRef
A= Clearance above grade, veranda, porch, deck, or balcony
B= Clearance to window or door that may be opened
C= Clearance to permanently closed window
D=
Vertical clearance to ventilated soffit located above the
terminal within a horizontal distance of 2 feet (61 cm)
from the center line of the terminal
E= Clearance to unventilated soffit
F= Clearance to outside corner
G= Clearance to inside corner
H= Clearance to each side of center line extended above
meter/regulator assembly
I= Clearance to service regulator vent outlet
J= Clearance to nonmechanical air supply inlet to building or
the combustion air inlet to any other appliance
K= Clearance to a mechanical air supply inlet
L= Clearance above paved sidewalk or paved driveway located
on public property
Clearance under veranda, porch, deck, or balcony
M=
1
In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Gas Code
* Clearance in accordance with local installation codes and the requirements of the gas supplier
.

Clearance to opposite wall is 24 inches (60 cm).
*
*
*
*
*
*
*
*
3 ft (91 cm) above if within
10 ft (3 m) horizontally
*
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
US Non-Direct Vent Installations 1
Vent Te rminal Air Supply Inlet
Area Where Te rminal
is Not Permitted
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.

8
6. Installation
Securing to the wall
IllustrationCheck
4. Drill holes for the remaining four screws.
5. Hang the unit again by the rst screw, and then
insert and tighten the remaining four screws.
6. Take waterproong measures so that water does
not enter the building from screws mounting the
device.
• Make sure the unit is installed securely so that it will
not fall or move due to vibrations or earthquakes.
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.
3. Determine the positions for the remaining four screws
(two for the top bracket and two for the bottom), and
remove the unit.
• The weight of the device will be applied to the wall. If the strength of the wall is not sufcient,
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 damaged and may become highly dangerous.
• Install the unit on a vertical wall and ensure that it is level.
• Do not install the water heater when the inside/outside temperature is below 40°F (5°C).
Locating Screw Holes
Mounting
Structure
• When installing with bare hands, take caution to
not inict injury.
• Be careful not to hit electrical wiring, gas, or water
piping while drilling holes.
Item
CAUTION
Be sure to do
Mounting Bracket
(upper)
Location of Screw Hole
Locating Screw Holes
Installations at Elevations
Above 2,000 ft.
• Adjust the DIP switches as illustrated in the table to
the right if this water heater is installed at an altitude
of 2000 ft. (610m) or higher.
• Disconnect power to the water heater before changing
the DIP switches. Failure to perform this step will result
in a "733" code displayed on the Display Window and
a cease in operation. If this occurs, disconnect, then
reconnect power to the water heater to reset the system.
Anchoring Screw
▲The illustration is an example. Please check with the actual water heater about the position of piping, and form.
* Do not change any other DIP switches.
* High elevation adjustment.
65
2,001 - 3,500 ft (611 - 1,050m)
0 - 2,000 ft (0 - 610m)
ON=OFF=

9
Filling the condensate container with water
DANGER
When initial start up, make sure that you perform the following procedures.
This is to prevent dangerous exhaust gases from entering the building.
Failure to following procedure could result in severe personal injury or death.
After installing the drain pipe, make sure that the area around the unit is well ventilated; open a window or a
door if necessary. Then, operate the unit and verify that condensate is coming out of the drain pipe. (During
normal use of the unit, condensate will begin to discharge from the drain pipe within 15 minutes of use.
However, depending on the season and/or installation site conditions, it may take longer.)