Noritz THERMALUX NERC98DV 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
NERC98DV (GQ-C2857WS-FF ET US) (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
SBB818D-1
Rev. 11/20
Requests to Installers
• In order to use the water heater safely, read this installation manual carefully, and follow the in-
stallation 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, 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.
CAUTION
*SBB818D*
FOR USE IN RESIDENTIAL OR MANUFACTURED HOME 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 and/or the Natural Gas and Propane Installation
Code CSA B149.1 - latest edition.
When applicable, installation must conform with the Manufactured
Home Construction and Safety Standard, Title 24 CFR, Part
3280 or the Canadian Standard CAN/CSA-Z240 MH Mobile
Homes, Series M86.
Noritz America reserves the right to discontinue, or change at any
time, the designs and/or specications of its products without notice.
CERTIFIED
R
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. 34) Remote Controller
Cord (6ft (2m))
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))
Quick Connect Cord
(QC-2) 11
1
each
Isolation Valves*
(includes pressure
relief valve)
Owner's Guide,
Installation Manual
(this document)
Bird Screen for
4" (100mm) PVC
VT4-PVCS
Bird Screen for
3" (75mm) PVC
VT3-PVCS
2
2
PVC Concentric
Termination
3" (75mm) : PVC-3CT
1
1
Pipe Cover
(PC-3S)
Note: Additional vent pieces are available; consult the latest product catalogue for details.
3" (75mm) / 4" (100mm)
Horizontal Hood
Termination PVT-HL
2
1
each
SV Conversion Kit
(SV-CK-3)
•90 Elbow
(With Inlet Screen)
• Installation Manual
(Check List)
* Isolation valves are necessary for ushing the Heat Exchanger.
They allow for easy ushing of the system.
** Not approved for use in Canada.
Plastic Rain Cap**
PRC-1
1

3
Union
Distance at center: 20.3 - 36.3 in. (515 - 922mm)
Quick Connect Cord
Union
Gas Valve
Union
Shutoff Valve
Shutoff Valve
Hot Water
Shutoff Valve
Cold Water
Distance on sides
2 - 18 in. (50 - 457mm)
Size the piping to allow for the
maximum flow rates of the units.
The backflow preventer is
put up before it diverges.
To drain outlet
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.
Make this distance as short
as possible.
*
The hot water temperature
will become unstable as the
pipe length increases.
To drain outlet
G
Quick Connect
Cord
Remote Controller Cord
Gas Supply Piping
Cold Water Supply
Hot Water
Remote Controller
Terminal Block
Cord
Connector
Cord
Connector
3.
Quick Connect Multi System Installation
• The Quick Connect Multi System allows the installation of two units together utilizing only the Quick
Connect Cord.
Typical Plumbing
* When connecting two units, use only a
single remote controller.
Note: Connect the remote
controller to only one
of the units.
System Diagram
• 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.
The Quick Connect Cord is 6 ft.(2m) long. Install the units 2-18" (50 - 457mm) 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).

4
4. 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
Check the Gas
• Check that the rating plate indicates the
correct type of gas.
• Check that the gas supply line is sized for
180,000 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. Do not use a solar pre-heater with the quick-connect multi-system.
Precautions for Mobile Home Installation
• Verify that the gas supply type matches the gas type listed on the rating plate. If a gas conversion
must be done, follow the instructions listed in the gas conversion kit manual.
• If this product will be installed indoors, usage of the SV conversion kit (SV-CK-3) is prohibited.
Make sure to follow all clearance and venting requirements outlined in this manual.
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 PVC, CPVC, or Category IV listed pipe is already
installed, check for punctures, cracks, or blockages and consult with the vent pipe manufacturer
before reusing.
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.

5
5. Choosing Installation Site
• 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 accumulate and reduce the performance of the unit's fan.
This can result in incomplete combustion.
• 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
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. Dust may accumulate
and reduce the performance of the unit's fan. This can result in incomplete
combustion.
• 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.
DANGER
WARNING
Prohibited
* 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 installation
locations cannot be avoided, a suitable drain pan, adequately drained, must 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.

6
• 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.
• 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) or the Natural Gas and Propane
Installation Code (CSA B149.1).
• If the unit is installed in a location with very high humidity, conden
sate may form inside the unit and/or cause incomplete combustion,
damage to the electrical components, or electric leakage.
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: 1-855-960-3434 and
request instructions.
Be sure to do
Prohibited
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:
Noritz N-Vent www.noritz.com
• 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.
• Do not install the water heater in a place where it may be threatened by
falling objects, such as under shelves.
• The water heater must be installed in a place where supply and 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.
Prohibited

7
6. 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. In Canada, see the Natural Gas and Propane Installation
Code CSA B149.1 - 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
12" (300mm)
or more
3" (75mm)
or more
4" (100mm)
or more
3" (75mm) 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

8
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 6 ft (1.83 m)
L=
Clearance above paved sidewalk or paved
driveway located on public property
Clearance under veranda, porch, deck,
or balcony
7 ft (2.13 m)†
M=
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).
12 in (30 cm)‡
*
12 in (30 cm)
6 in (15 cm) for appliances
≤ 10,000 Btuh (3kW), 12 in
(30 cm) for appliances > 10,000
Btuh (3kW) and ≤ 100,000 Btuh
(30 kW), 36 in (91 cm) for
appliances > 100,000 Btuh (30 kW)
Above a regulator within 3 ft (91 cm)
horizontally of the vertical center line of
the regulator vent outlet to a maximum
vertical distance of 15 ft (4.5 m)
6 in (15 cm) for appliances
≤ 10,000 Btuh (3kW), 9 in
(23 cm) for appliances > 10,000
Btuh (3kW) and ≤ 50,000 Btuh
(15 kW), 12 in (30 cm) for
appliances > 50,000 Btuh (15 kW)
6 in (15 cm) for appliances
≤ 10,000 Btuh (3kW), 12 in
(30 cm) for appliances > 10,000
Btuh (3kW) and ≤ 100,000 Btuh
(30 kW), 36 in (91 cm) for
appliances > 100,000 Btuh (30 kW)
6 in (15 cm) for appliances
≤ 10,000 Btuh (3kW), 9 in
(23 cm) for appliances > 10,000
Btuh (3kW) and ≤ 50,000 Btuh
(15 kW), 12 in (30 cm) for
appliances > 50,000 Btuh (15 kW)
*
*
*
*
**
*
*
*
3 ft (91 cm) above if within
10 ft (3 m) horizontally
*
12 in (30 cm)
Vent Terminal
D
E
B
B
F
B
A
G
H
I
CB
M
K
J
B
B
L
Air Supply Inlet
Area Where Terminal
is Not Permitted
A
I
US Direct Vent Installations
2
Canadian Direct Vent Installations
1
Clearance Requirements from Vent Terminations to Building Openings
<When supplying combustion air from the outdoors (Direct Vent)>
* 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 the Natural Gas and Propane Installation Code
CSA B149.1.

9
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 6 ft (1.83 m)
L=
Clearance above paved sidewalk or paved
driveway located on public property
Clearance under veranda, porch, deck,
or balcony
7 ft (2.13 m)†
M=
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).
12 in (30 cm)‡
*
12 in (30 cm)
6 in (15 cm) for appliances
≤ 10,000 Btuh (3kW), 12 in
(30 cm) for appliances > 10,000
Btuh (3kW) and ≤ 100,000 Btuh
(30 kW), 36 in (91 cm) for
appliances > 100,000 Btuh (30 kW)
Above a regulator within 3 ft (91 cm)
horizontally of the vertical center line of
the regulator vent outlet to a maximum
vertical distance of 15 ft (4.5 m)
4 ft (1.2 m) below or to side
of opening; 1 ft (300 mm)
above opening
6 in (15 cm) for appliances
≤ 10,000 Btuh (3kW), 12 in
(30 cm) for appliances > 10,000
Btuh (3kW) and ≤ 100,000 Btuh
(30 kW), 36 in (91 cm) for
appliances > 100,000 Btuh (30 kW)
4 ft (1.2 m) below or to side
of opening; 1 ft (300 mm)
above opening
*
*
*
*
**
*
*
*
3 ft (91 cm) above if within
10 ft (3 m) horizontally
*
12 in (30 cm)
US Non-Direct Vent Installation
2
Canadian Non-Direct Vent Installation
1
Vent Terminal
Air Supply Inlet
Area Where Terminal
is Not Permitted
* 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 the Natural Gas and Propane Installation Code
CSA B149.1.
Clearance Requirements from Vent Terminations to Building Openings
<When supplying combustion air from the indoors (Non-Direct Vent)>

10
7. 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.
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 chang-
ing the dip switches. Failure to perform this step will
result in a "73" code displayed on the remote control-
ler and a cease in operation. If this occurs, discon-
nect, then reconnect power to the water heater to
reset the system.
Note : Please refer to page 34 for the location of the
dip switch bank.
Anchoring Screw
* Do not change any other dipswitches.
* High elevation adjustment.
65
2,001 - 4,000 ft (611 - 1,220m)
0 - 2,000 ft (0 - 610m)
ON= OFF=
4,001 - 6,000 ft (1,221 - 1,830m)
6,001 - 8,000 ft (1,831 - 2,440m)

11
Filling the condensate container with water
The condensate container can be lled before connecting the vent pipe.
Filling the condensate container before vent pipe installation.
DANGER
Prior to initial start up, make sure that you ll the condensate container with water.
This is to prevent dangerous exhaust gases from entering the building.
Failure to ll the condensate container could result in severe personal injury or death.
Please follow one of the procedures described below to ensure that the condensate container is lled with water.
1) Fill the condensate container by pouring approx. 30 oz.(850ml) of water into the exhaust accessory on the
top of the appliance as illustrated below.
Or, if the vent pipe has already been installed:
2) After installing the drain pipe, make sure that the area around the appliance 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 water heater, 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.)
Note: The condensate discharged from the water heater has a pH level of approximately 2-3.
If required by local code, the condensate must be neutralized prior to disposal into the sewer system.
Refer to pages 30-31 for additional details.
30 oz.
850ml
Intake
Exhaust

12
Maximum Vent Lengths
• This appliance has been designed to be vented
with either 3" (75mm) or 4" (100mm) PVC or
CPVC pipe.
Do not exceed the following maximum vent lengths:
8. Vent Pipe Installation (Indoor Installation Only)
WARNING
Be sure to do
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 the Natural Gas and
Propane Installation Code CSA B149.1 – latest edition.
No. of Elbows Max. Straight Vent Length*
6 24' ( 7.2m) 24' ( 7.2m)
5 30' ( 9.0m) 30' ( 9.0m)
4 35' (10.8m) 35' (10.8m)
3 41' (12.6m) 41' (12.6m)
2 47 (14.4m) 47 (14.4m)
1 53' (16.2m) 53' (16.2m)
Pipe diameter 3" (75mm) 4" (100mm)
• The venting system shall be installed in accordance
with the water heater manufacturer's instructions
and, if applicable, the venting system manufacturer's
instructions.
• This is a Category IV appliance.
Only vent materials approved for use with
Category IV appliances should be used.
• Under normal conditions, this appliance will
not produce an exhaust flue temperature
in excess of 149°F (65°C) and schedule 40
PVC pipe may be used as the vent material.
If required by local code, use schedule 40 or
80 CPVC.
Refer to page 14 for additional requirements.
• Make sure the vent system is gas tight and
will not leak.
• Support the vent pipe with hangers at regular
intervals as specied by these instructions or
the instructions of the vent manufacturer.
• All piping must be fully supported. Use pipe
hangers at a minimum of 3 ft (0.9 m) intervals.
Do not use the Water Heater to support the
vent piping.
• 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' (0.9m).
• Do not store hazardous or ammable 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.
• The vent for this appliance shall not terminate:
i) over public walkways; or
ii) near soft vents or crawl space vents or
other areas where condensate or vapor
could create a nuisance or hazard or
cause property damage; or
iii) where condensate vaper could cause
damage or could be detrimental to the
operation of regulators, relief valves, or
other equipment.
General Requirements
Clearances
PVC or CPVC has been approved for use on this
appliance with zero clearance to combustibles.
* Not including the termination
• Maintain the same vent pipe diameter from the
heater ue to the vent termination. The exhaust
and intake pipes must be the same vent pipe
diameter.

13
3
6
9
12
15
18
21
24
27
30
32
35
38
41
44
47
50
53
56
62
0.90
1.80
2.70
3.60
4.50
5.40
6.30
7.20
8.10
9.00
9.90
10.80
11.70
12.60
13.50
14.40
15.30
16.20
17.10
18.90
m10234 56ft
Vent length*Elbows
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
The BTUH input of the appliance
will be reduced by up to 5%.
The BTUH input of the appliance
will be reduced by up to 3%.
Number of
pieces**
13
24
13
24
Short length using 4" (100mm)pipe
Short length using 3" (75mm)pipe
Long length using 3" (75mm)pipe
Long length using 4" (100mm)pipe
Short length using 4" (100mm)pipe
Short length using 3" (75mm)pipe
Long length using 3" (75mm)pipe
Long length using 4" (100mm)pipe
**Table assumes straight vent pieces are 3’ (0.9m) each.
Shorter or longer vent pieces may also be used up to the maximum allowed
vent length.
* Do not change any other dipswitches.
* Vent length condition.
1
78
ON= OFF=
2
3
4
The power must be unplugged when
adjusting the dip switches to switch the
airow amount.
The unit can be adjusted to accommodate longer vent runs; refer to the below table to nd the
maximum vent length based on the number of elbows. Adjust the dip switches according to the vent
condition noted in the tables below.
Note: By default, the unit has been set to the " 1 short length" condition. When adjusting the dip
switches for longer vent runs, the BTUH input of the appliance will be reduced by up to 5%.
Maximum Vent Length Adjustment Dipswitches
- Two 90° elbows, maximum length = 18 ft. (5.4m)
(with dip switches set at "short length" condition)
- Two 90° elbows, maximum length = 47 ft. (14.4m)
(with dip switches set at "long length" condition)
[Maximum Vent Length Example]
• Disconnect power to the water heater before changing the dip switches. 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, then reconnect power to the water heater to reset the system.
Note : Please refer to page 34 for the location of the dip switch bank.
<Maximum Vent Length Congurations>

14
WARNING
CARBON MONOXIDE POISONING
Failure to properly seal the vent system could
cause flue products to enter the living space.
PVC/CPVC Installation Instructions
• Use only solid PVC or CPVC schedule 40 pipe. Cellular foam core piping is not allowed.
•
•
In Canada, plastic vent systems must be certified to ULC S636. The components of the certified
vent system must not be interchanged with other vent systems or unlisted pipe/fittings.
• In Canada, specified primers and glues of the ULC S636 certified vent system must be from a
single system manufacturer and not intermixed with other system manufacturer’s vent system
parts.
• Follow all general venting guidelines as outlined on this page.
• The pipe shall be installed so that the first 3’ (0.9m) of pipe from the appliance flue outlet is readily
accessible for visual inspection.
• When preparing and assembling the pipe, follow instructions as provided by the pipe
manufacturer. In general, the following practices must be observed:
o Squarely cut all pieces of pipe.
o Remove all burs and debris from joints and fittings.
o All joints must be properly cleaned, primed, and cemented. Use only cement and primer
approved for use with the pipe material as outlined in the above table.
•
• PVC or CPVC pipe has been approved for use on this appliance with zero clearance to combustibles.
All piping must be fully supported. Use pipe hangers at a minimum of 3’ (0.9m) intervals. Do not use
the water heater to support the vent piping.
3" or 4" schedule 80 pipe may also be used on this appliance, however the BTUH input of the
appliance will be reduced by up to 5%.
Venting With PVC or CPVC
This appliance can be vented with non cellular core plastic pipe materials as specified in the below table.
Vent installations in Canada which utilize plastic vent systems must comply with ULC S636.
•
•A
bird screen must be installed on the vent terminations to prevent debris or animals from entering the
piping. These screens are not supplied with the water heater and must be purchased separately
(part #VT4-PVCS, use part #VT3-PVCS when using 3" (75mm) PVC or CPVC).
When attaching the piping to the water heater, use the appropriate primer and cement to ensure a
proper seal.
Item Material United States Canada
Exhaust Vent/Air Intake
Schedule 40 PVC ANSI/ASTM D1785
U
CSA B137.3
CSA B181.2
CSA B137.3
LC S636 Certified
Materials Only
PVC-DWV ANSI/ASTM D2665
Schedule 40 CPVC ANSI/ASTM F441
Pipe Cement/Primer PVC ANSI/ASTM D2564
CPVC ANSI/ASTM F493
Note: Use of cellular core PVC (ASTM F891), cellular core CPVC, or
Radel (polyphenylsulfone) in non-metallic venting system is prohibited.
R
•Covering non-metallic vent pipe and fittings with thermal insulation is prohibited.

15
Vertical Vent Termination- PVC/CPVC Materials Only
•
•
•
•
•
•
•
•
Horizontal Vent Termination- PVC/CPVC Materials Only
•
•
•
•
•
•
Hanger
Straps
**1' mini
* Not supplied with water heater,
order separately.
mum recommended,
but not required.
3 ft. Min.
FirestopFirestop
Firestop/Support
Roof
Flashing
Roof
Flashing
Hanger
Strap
**1'
Minimum
**1'
Minimum
Support
Slope the
Vent Upward
Intake
Exhaust
Intake Exhaust
12" over maximum
snow level
or 24", whichever
is greater.
12" over maximum
snow level
or 24", whichever
is greater.
Insert Bird
Screen* in
End of
90 Elbow
Storm
Collar
Storm
Collar
As illustrated on the left, make sure to keep a distance
of 3' (0.9m) or wider between the intake and exhaust
when installing the vent piping.
Terminate at least 6' (1.8m) from the combustion air
intake of any appliance, and 3' (0.9m) from any other
building opening, gas utility meter, service regulator etc.
Enclose exterior vent systems below the roof line to limit
condensation and protect against mechanical failure.
When the vent penetrates a floor or ceiling and is not
running in a fire rated shaft, a firestop and support is
required.
When the vent termination is located not less than
8' (2.4m) from a vertical wall or similar obstruction,
terminate above the roof at least 2' (0.6m), but not
more than 6' (1.87m), in accordance with the National
Fuel Gas Code ANSI Z223.1/NFPA 54 or Natural Gas
and Propane Installation Code CSA B149.1.
Provide vertical support every 3' (0.9m) or as required
by the vent pipe manufacturer's instructions.
A short horizontal section is recommended to prevent
debris from falling into the water heater.
When using a horizontal section, slope the horizontal
vent 1/4” upwards for every 12” (300mm) toward the
termination to drain condensate.
**1' minimum recommended,
but not required.
*
Not supplied with water heater,
order separately.
When choosing intake and exhaust terminations, you must use the
same type of elbow (i.e. both 90° elbows).
This will help with proper combustion by putting both terminations in
the same pressure zone.
When choosing intake and exhaust terminations, you must use the
same type of elbow (i.e. both 90° elbows).
This will help with proper combustion by putting both terminations in
the same pressure zone.
Insert Bird
Screen* in
End of
90 Elbow
Insert Bird Screen*
in End of 90 Elbow
3” Min.
As illustrated on the left, make sure to keep a distance of 3' (0.9m)
or wider between the intake and exhaust when installing the vent piping.
* If 3’ (0.9m) distance between Intake and Exhaust cannot be ensured,
the installation can be carried out only in the installation method shown in page 17.
The PVT-HL termination may be used in place of elbows as the
horizontal vent terminations. It is not necessary to use bird screens
with the PVT-HL termination.
Terminate at least 12" (300mm) above grade or above snow line.
Slope the horizontal vent 1/4" upwards for every 12" (300mm)
toward the termination.
Use a condensation drain if necessary.
In the Commonwealth of Massachusetts a carbon monoxide detector
is required for all side wall horizontally vented gas fuel equipment.
Please refer to Technical Bulletin TB 010606 for full installation
instructions.
Slope the
Vent Upward
Vent Pipe Installation

16
•
•
•
•
•
•
Hanger
3" (75mm) or
4" (100mm)
Intake*
3" (75mm )PVC Concentric Termination
3" (75m m ) or
4" (100m
m )
Exhaust*
Straps
The concentric termination may be shortened,
but not lengthened from its original factory
supplied length.
Terminate at least 12" (300mm) above grade or
above snow line.
For vertical installation, terminate at least 7' (2.1m)
above a public walkway, 6' (1.8m) from the combustion
air intake of any appliance, and 3' (0.9m) from any
other building opening, gas utility meter, service
regulator etc.
Slope the horizontal vent 1/4" upwards for every
12" (300mm).
Use a condensation drain if necessary.
In the Commonwealth of Massachusetts a carbon
monoxide detector is required for all side wall
horizontally vented gas fuel equipment.
Please refer to Technical Bulletin TB 010606 for full
installation instructions.
Slope the
Vent Upward
PVC-3CT
* 4" (100mm) pipe requires the use of a reducing coupling
just prior to the termination.
* 4" (100mm) pipe requires the use of a reducing coupling
just prior to the termination.
1" (25mm) to
2" (50mm)
Insert Bird Screen ***
in End of Termination
•
There must be a 1" (25mm) to 2" (50mm) clearance
between the outside wall and the air intake section
of the termination as illustrated on the left.
•
•
3" (75mm) or 4" (100mm) PVC or CPVC pipe
may be used with the concentric termination.
Maintain the same vent pipe diameter from the
water heater flue to the termination.
•
Install a securing strap to prevent movement of
the termination.
Strap
*** Not supplied with
water heater,
order separately.
Horizontal
Vertical
12"(30cm)
3"(75mm) or
4"(100mm)
Exhaust*
PVC-3CT
3"(75mm) or
4"(100mm)
Intake*
When using 4" (100mm) pipe, it will be necessary to
use 4" (100mm) x 3" (75mm) reducing couplings and
a short section of 3" (75mm) pipe to connect to the
Exhaust and Intake Flue of Water Heater.
Use maximum 6" (150mm) section of pipe to make
the connection between the reducing couplings and
the Exhaust and Intake Flue of the Water Heater.
3" pipe
Plastic Rain Cap**
(PRC-1)
**Not supplied with water
heater, order separately.

17
Vent Pipe Installation
Alternate Horitzontal V
ent Termination- PVC/CPVC Materials Only
2ft. Min
Interior View
Interior View Exterior View
Interior View Exterior View
1ft. Min1ft. Min
Ensure at least 2ft (0.6m) or more distance between
intake pipe and exhaust pipe.
The distance is measured at inside of pipe to inner
dimension.
•
Upper side is exhaust, lower side is intake.
The reverse connection is not allowed.
•
Ensure at least 1ft (0.3m) or more distance between
intake pipe and exhaust pipe.
The distance is measured at the outlets of
intake port (terminal) and exhaust port (terminal).
•
The side distant from wall is intake, the side near the
wall is exhaust.
The reverse connection is not allowed.
•
Ensure at least 1ft (0.3m) or more distance between
intake pipe and exhaust pipe.
The distance is measured at inside of pipe to inner
dimension.
•
•
Exhaust
Intake
Exhaust Intake
1ft. Min
Exterior View
Exhaust
Exhaust
Intake
Intake
Exhaust Intake
3” Min
WARNING
If the distance between the air inlet and exhaust vent terminations is too short, the water heater
will draw in the exhaust gases through the intake. There is a risk of inadequate combustion air
for the water heater, increasing Carbon Monoxide (CO) emissions and noise due to vibration.
•Termination elbows must be oriented vertically, pointing directly downward. Attempts to prevent
exhaust air from entering the air inlet by angling termination elbows in directions other than
directly downward will increase the risk of freezing.
•Reversing the air intake and exhaust pipes is not allowed.
Carbon Monoxide (CO) emissions and noise due to vibration will increase.
3” Min
3” Min
5.9”
5.9”
5.9”
* When 3’
(0.9m) distance between Intake and Exhaust cannot be ensured.
* Can not use Hood termination (PVT
-HL).
* Insert the bird screen. 90° elbow vertical setting (downward).
* Ensure at least 3ft (0.9m) or more distance between the near edge of the air intake pipe or exhaust pipe to the
inside corner of a wall.
* Intake and exhaust should face the same direction. Intake and exhaust should keep the same pressure zone.

18
Vertical Vent Termination- PVC/CPVC Materials Only
Firestop
Firestop/Support
Roof
Flashing
Storm
Collar
Hanger
Strap
Horizontal Vent Termination- PVC/CPVC Materials Only
Hanger
Straps
**1' (0.3m) Minimum
Slope the
Vent Upward
**1' (0.3m) Minimum
* Not supplied with water
heater, order separately.
recommended, but not required.
Insert Bird
Screen* in
Each End
of Tee
Support
Insert Bird
Screen* in
End of 90
Elbow
* Not supplied with water
heater, order separately.
**1' (0.3m)
Minimum
**1' (0.3m) minimum
recommended, but not required.
•
•
•
•
•
•
•
•
•
•
•
A tee, the PVT-HL termination may be used for the vent
termination. It is not necessary to use bird screens with
the PVT-HL termination.
Terminate at least 12" (300mm) above grade or above
snow line.
Slope the horizontal vent 1/4" upwards for every 12" (300mm)
toward the termination.
Use a condensation drain if necessary.
In the Commonwealth of Massachusetts a carbon monoxide
detector is required for all side wall horizontally vented gas
fuel equipment.
Please refer to Technical Bulletin TB 010606 for full installatio
n
in structions.
Enclose exterior vent systems below the roof line to limit
condensation and protect against mechanical failure.
When the vent penetrates a floor or ceiling and is not
running in a fire rated shaft, a firestop and support is
required.
When the vent termination is located not less than
8' (2.4m) from a vertical wall or similar obstruction,
terminate above the roof at least 2' (0.6m), but not
more than 6' (1.87m), in accordance with the National
Fuel Gas Code ANSI Z223.1/NFPA 54 or Natural Gas and
Propane Installation Code CSA B149.1.
Provide vertical support every 3' (0.9m) or as required
by the vent pipe manufacturer's instructions.
A short horizontal section is recommended to prevent
debris from falling into the water heater.
When using a horizontal section, slope the horizontal
vent 1/4” upwards for every 12” (300mm) toward the
termination to drain condensate.
Exhaust
Intake
Exhaust
Intake
90 Elbow
SV Conversion Kit
Accessory
(#SV-CK-3)
90 Elbow
SV Conversion Kit
Accessory
(#SV-CK-3)
Inlet screen
Inlet screen
3” Min.
Slope the
Vent Upward
Vent Pipe Installation (When supplying combustion air from the indoors (SV, non-direct vent))
• Disconnect power and turn ON dip switch 3 if combustion air will be supplied from the
indoors as illustrated to the right. Refer to page 34 for the location of the dip switch bank.
• SV Conversion kit #SV-CK-3 is required for the air intake.
* Dip switch No.3 is turned on.
Failure to perform the above 2 steps could result in a re or explosion causing
property damage, personal injury or death.
Refer to the instructions provided with the conversion kit for additional details.
WARNING
When installing this water heater in an area with a large amount of lint such as a commercial Laundromat,
direct -vent ("-DV") system must be used. The "-SV" conguration (using an SV conversion kit) is prohibited.
When installing this water heater in a mobile home, all combustion must be drawn directly from the
outdoors. The "-SV" conguration (using SV conversion kit) is prohibited.
DANGER

19
Supply combustion air to the units as per the National Fuel Gas Code, ANSI Z223.1-
latest edition and in Canada, in accordance with the Natural Gas and Propane Installa-
tion Code CSA B149.1-latest edition.
Combustion Air
Openings supplying indoor air
H
W
H
W
• Provide two permanent openings to allow
circulation of combustion air.
• A minimum free area of each openings
• If the unit is installed in a mechanical closet,
a minimum of permanent clearance of 4" or
more in front of the unit is required. A 24" or
more clearance is recommended in order to
facilitate maintenance and repair.
• If combustion air will be provided through a
duct, size the duct to provide 63 cubic feet of
fresh air per minute.
• If the unit is installed in a mobile home, outdoor
air must be supplied. The usage of the "-SV"
conversion kit is prohibited.
Indoor make up
air is provided
Outdoor make up air is provided
Direct or
Vertical ducts
Horizontal ducts
180 in2
20" (W) x 9" (H)
45 in2
10" (W) x 4 1/2" (H)
90 in2
20" (W) x 4 1/2" (H)
Provide adequate combustion air so as to not create negative pressure within the building.

20
Follow the instructions from the gas supplier.
9. Gas Piping
Gas Type
The gas type indicated on the water heater rating plate (NG or LP) must match the type of gas being
supplied to the water heater.
Gas Conversions
If the gas type supplied does not match the gas type on the rating plate, obtain a replacement unit with
the proper gas type. If a gas type conversion must be made, there are conversion kits available for
some models. [The conversion kit shall be installed by a qualied service agency in accordance with
the manufacturer’s instructions and all applicable codes and requirements of the authority having jurisdiction.
The qualied service agency is responsible for the proper installation of this kit. Improper installation of
this kit will void the warranty.]
Meter
The gas meter must be sized properly for the water heater and other gas appliances to operate properly.
Select a gas meter capable of supplying the entire btuh demand of all gas appliances in the building.
The guidelines and examples we have provided in this manual section are for reference only.
The sizing and installation of the gas system for this water heater, as with any gas appliance, is the
sole responsibility of the installer. The installer must be professionally trained to do such work and
must always follow all local and national codes and regulations. Gas line sizing calculations must
be performed for every installation. Please contact Noritz America at 855-960-3434 if you have any
questions or concerns.
CAUTION
Regulators
Ensure that all gas regulators used are operating properly and providing gas pressures within the specied
range of the water heater being installed. Excess gas inlet pressure may cause serious accidents.
CAUTION
Pressure
Check the gas supply pressure immediately upstream at a location provided by the gas company. Supplied
gas pressure must be within the limits shown in the specications section with all gas appliances operating.
The inlet gas pressure must be within the range specied. This is for the purposes of input adjustment.
Low gas pressure may cause a loss of ame or ignition failure at other appliances in the home, which may
result in unburned gas in the home. Serious accidents such as re or explosion may result.
Measuring Gas Pressure
In order to check the gas supply pressure to the unit, a tap is provided on the
gas inlet. Remove the 9/32” hex head/Philips screw from the tap, and connect
a manometer using a silicon tube. Open up at least 2 xtures and hold in the
maximum manifold pressure button on the circuit board. Please call Noritz for
details.
WARNING