Noritz NCC300DV 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
NCC300DV (GQ-C5032WZ-FF 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
SBB80Z0-2
Rev. 11/20
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, 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
*SBB80Z0*
FOR USE IN COMMERCIAL 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
7
Remote Controller
(See p. 37)
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, Warranty,
Installation Manual
(this document)
Bird Screen for
4" (100mm) PVC
VT4-PVCS
2
1
Pipe Cover
(PC-7S)
Note: Additional vent pieces are available; consult the latest product catalogue for details.
4" (100mm)
Horizontal Hood
Termination PVT-HL
Plastic Rain Cap**
PRC-1
2
1
each
11
1
System Controller Unit
SCU-301-12M
SCU-401-12M
SCU-401-24M
System Controller
(SC-301-6M, SC-401-6M)
SV Conversion Kit
( SV-CK-4)
•90 Elbow
(With Inlet Screen)
• Installation Manual
(Check List)
Drain hose
(With clamp) 2
1
1
Neutralizer
(NT20A)
(For up to 10 water heaters)
4"PVC to 5"
SS Vent Adapter
(PVC4XVP5-ADAPT)
* Isolation valves are necessary for ushing the Heat Exchanger.
They allow for easy ushing of the system.
** Not approved for use in Canada.
1
1
Noritz Connect
Wireless Adapter
NWC-ADAPTER
(NAW-1 US)

3
To drain outletTo drain outlet
To drain outlet
Cold Water
Hot Water
Quick Connect Cord
Union
Gas Valve
Pressure
Relief Valve
Isolation Valve*
* Isolation valves are
necessary for flushing
the Heat Exchanger.
They allow for
easy flushing of
the system.
Make this distance as
short as possible.
The hot water temperatur
e
will become unstable as
the pipe length increases.
Size the piping to allow for the
maximum flow rates of the units.
The backflow preventer should be placed
upstream of the cold water branch.
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.
Distance on sides
3-17" (75-432mm)
Exhaust
Intake
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.
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 3-17" (75 - 432mm) 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 di󰀨erence in pipe length
between the two units).
Note: Connect the remote
controller to only one
of the units.
Units must be same
model in order to
quick connect.

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
300,000 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-4) 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 o󰀨 of roofs.
e.g. NCC300DV(GQ-C5032WZ-FF US)

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
a󰀨ected by fans or range hoods.
• Take care that noise and exhaust gas will not a󰀨ect 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,
condensate 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: 1-866-766-7489 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.
• Do not install the water heater near staircases or emergency exits.
• 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.
• Do not locate the vent termination directed towards a window or any other
structure which has glass or wired glass facing the termination.
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
su󰀩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
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 11 for the location of the
dip switch bank.
Anchoring Screw
* Do not change any other dipswitches.
* High elevation adjustment.
5
2,001 - 4,500 ft (611 - 1,350m)
0 - 2,000 ft (0 - 610m)
ON=OFF=

11
Filling the condensate container with water
Location of the dip switch bank
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 slowly 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
20 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 33-34 for additional details.
30 oz.
850ml
Intake
Exhaust

12
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*
4 39' (11.7m) N/A
3 45' (13.5m) 15' (4.5m)
2 51' (15.3m) 30' (9.0m)
1 57' (17.1m) 45' (13.5m)
Pipe diameter 4" (100mm) 5" (127mm)
• This appliance has been designed to be vented
with 4" (100mm) PVC, CPVC or PP pipe.
• This appliance has been designed to be vented
with 5" (127mm) N-Vent or Category III vent by
using 4" PVC to 5" SS Vent Adapter.
Do not exceed the following maximum vent lengths:
• 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 ue temperature in excess
of 149°F (65°C) and schedule 40 PVC pipe may
be used as the vent material. If the water heater
set temperature is 160°F (70°C) or higher and
there is a return line to the water heater from
either a recirculation pump or a combination
space heating system, schedule 40/80 CPVC
or PP must be used.
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).
• 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 so󰀩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 Maximum Vent Lengths
* Not including the termination
Refer to page 17 for max. vent lengths
when using PVC Concentric Termination.
1. Continue to insert the Vent Pipe until it
reaches to the base of the unit Exhaust and
Intake Flue. (The Vent Pipe will be inserted
approximately 1.6"(40mm).)
2. Secure the Vent
Pipe by tightening
the band using a
screwdriver. (The
tightening torque
shall be more than
16 in lb.)
How to tighten the Vent Pipe
Exhaust and
Intake Flue
Vent Pipe
Screwdriver
-Flat head
-Box wrench(5/16")
Clearances
PVC, CPVC or PP has been approved for use on
this appliance with zero clearance to combustibles.
• The exhaust and intake pipes must be the
same vent pipe diameter.
Venting with PP pipe
• Do not deform the PP pipe when cutting.
• Deburr the cut end so that damage to the
gasket is avoided.
• Remove debris from inside the pipe prior to assembly.
Damaged gaskets can cause leakage of
dangerous levels of carbon monoxide or
property damage due to condensate leaks.

13
Maximum Vent Length Adjustment Dipswitches
<Maximum Vent Length and Reduced Input Congurations>
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 using 4" (100mm) pipe" condition. When adjusting
the dip switches for longer vent runs, the BTUH input of the appliance will be reduced by up to 2%.
- Two 90° elbows, maximum length = 18 ft. (5.4m)
(with dip switches set at " 1 short length using 4" (100mm) pipe" condition)
- Two 90° elbows, maximum length = 51 ft. (15.3m)
(with dip switches set at " 2 long length using 4" (100mm) pipe" 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 11 for the location of the dip switch bank.
The power must be unplugged when adjusting
the dip switches to switch the airow amount.
3
6
9
12
15
18
21
24
27
30
33
36
39
42
45
48
51
54
57
60
63
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
18.00
18.90
m10234ft
Vent length* Elbows
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Number of
pieces**
3
6
9
12
15
18
21
24
27
30
33
36
39
42
45
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
m213
ft
Vent length*
5” Pipe
Elbows
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Number of
pieces**
13
24
Short length using 5" (127mm)pipe
Short length using 4" (100mm)pipe
Long length using 4" (100mm)pipe Long length using 5" (127mm)pipe
Short length using 5" (127mm)pipe
Short length using 4" (100mm)pipe
Long length using 4" (100mm)pipe
Long length using 5" (127mm)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
PVC / CPVC pipe
PP pipe
Do not change any other dipswitches.
Vent Material
4
ON=OFF=
4” Pipe
* Not including the termination.
* Not including the termination.
4" schedule 80 pipe may also be used on this appliance,
however because the inside diameter is smaller than
schedule 40, the maximum vent length must be shortened.
Refer to page 17 for max. vent lengths
when using 4” PVC Concentric Termination.
1
2
4
3
The BTUH input of the
appliance will be reduced
by up to 2%.
The BTUH input of the
appliance will be reduced
by up to 2%.
Schedule 80
Schedule 40
The BTUH input of the
appliance will be reduced
by up to 2%.
The BTUH input of the
appliance will be reduced
by up to 2%.

14
WARNING
CARBON MONOXIDE POISONING
Failure to properly seal the vent system could
cause flue products to enter the living space.
Item Material United States Canada
Approved Vent Manufacture
Centrotherm - lnnoFlue®PP
Single Wall Pipe (4”) : ISVL04xx(UV), ISEP04xx
Elbow : ISELL0487(UV), ISEL0445
Termination** : ISELL0487UV, ISTT0420
Bird Screen : IASPP04
4" PP Adapter*** : ISAAN0404
Parts#
Vent Material
4"(100mm) PVC or CPVC
Centrotherm - 4"(100mm) PP
Bird Screen Parts #
VT4-PVCS
IASPP04
Exhaust Vent/Air Intake
Schedule 40/80 PVC ANSI/ASTM D1785
PVC-DW
Polypropylene*
V ANSI/ASTM D2665
Schedule 40/80 CPVC ANSI/ASTM F441
Pipe Cement/Primer PVC ANSI/ASTM D2564
CPVC ANSI/ASTM F493
PVC / CPVC / PP
PVC / CPVC / PP
I
I
n
n
s
s
t
t
allation Instruction
allation Instruction
s
s
• Use only solid PVC / CPVC (schedule 40/80) or PP pipe. Cellular foam core piping is not allowed.
• Covering non-metallic vent pipe and fittings with thermal insulation is prohibited.
•
•
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
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, CPVC or PP 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.
4" schedule 80 pipe may also be used on this appliance, however because the inside diameter is
smaller than schedule 40, the maximum vent length must be shortened.
Venting With PVC, CPVC or PP
Venting With PVC, CPVC or PP
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.
* Polypropylene : Only listed manufacture specified vent parts may be used for this appliance.
Refer to the manufacture's literature for detailed information.
** Applicable vent termination are "90 degree elbow" or "Tee type".
Concentric vent termination of polypropylene are prohibited.
*** When attaching polypropylene vent materials to the water heater,
a special adapter must be used.
•
•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,
When attaching the piping to the water heater, use the appropriate primer and cement to ensure a proper seal.
U
CSA B137.3
CSA B181.2
CSA B137.3
Centrotherm-lnnoFule®
(certified ULC 636S)
LC S636 Certified
Materials Only
Note: Use of cellular core PVC (ASTM F891), cellular core CPVC, or
Radel (polyphenylsulfone) in non-metallic venting system is prohibited.
R
manufacturer.
4" PP Adapter
ISAAN0404

15
Vent Pipe Installation
3 ft. Min.
FirestopFirestop
Firestop/Support
Roof
Flashing
Roof
Flashing
Hanger
Strap
**1'
Minimum
Support
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
**1' minimum recommended,
but not required.
*
Not supplied with water heater,
order separately.
Insert Bird
Screen* in
End of
90 Elbow
Slope the
Vent Upward
V
ertical Vent Termination - PVC, CPVC or PP Material
Horizontal Vent Termination - PVC/CPVC Material Only (when using PVT-HL termination)
Hanger
Straps
**1' mini
* Not supplied with water heater,
order separately.
mum recommended,
but not required.
3 ft. Min.
Firestop Firestop
Firestop/Support
Roof
Flashing
Roof
Flashing
Hanger
Strap
**1'
Minimum
**1'
Minimum
Support
Slope vent
Upwards
Intake
Exhaust
Slope the Vent
Upward
12" over
maximum
snow level
12" over
maximum
snow level
Insert Bird
Screen* in
End of 90 Elbow
Storm
Collar
Storm
Collar
•
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 16.
• 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.
Insert Bird
Screen* in
End of 90 Elbow
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
3” Min.
Intake
4" (100mm)
Interior Wall
Ceiling
Exhaust
4" (100mm)
Slope the Vent
Upward
Hanger Straps
* 1' Minimum recommended, but not required.
** 4" (100mm) pipe and 4"×4"
couplings
require when using PVT-HL.
* 1' Minimum
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.
Ӎ3ft. Min
Intake
Exhaust
Exterior Wall
PVT-HL
4" (100mm)
12"(300mm)
above grade or
above snow line
** 4" x 4" coupling
Exhaust
2" (50mm)
Intake
2" (50mm)
* Not supplied with water
heater, order separately.
** 1' Minimum recommended,
but not required.
The PVC/CPVC elbow may be used in place of
PVT-HL as the horizontal vent termination.
•
•
•
•
•
•
•
•
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 3’ (0.9m) from the combustion air
intake of any appliance and any other building opening.
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.
When using 4" PP pipe
4" PP Adapter
ISAAN0404
4" pipe
4" pipe
When using 4" PVC/CPVC pipe
4"x4" coupling

16
Vent Pipe Installation
Alternate Horizontal V
ent Termination- PVC, CPVC or PP Material
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 orientation 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 orientation 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.
•
•
•
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.
* 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.
6.3"
6.3"
Exhaust
Exhaust
Intake
Intake
Ӎ2ft. Min
Ӎ1ft. Min
Ӎ3" Min
㸦between outside
wall and termination)
Ӎ3" Min
(between outside
wall and termination)
㸦between outside
wall and termination)
Interior View Exterior View
Interior View Exterior View
Interior View Exterior View
6.3"
Exhaust
Intake
Ӎ1ft. Min
Ӎ3" Min
When using 4" PP pipe
4" PP Adapter
ISAAN0404
4" pipe
4" pipe
When using 4" PVC/CPVC pipe
4"x4" coupling

17
No. of
Elbows
4
3
2
Max. Straight Vent Length*
4" (100mm) PVC or CPVC
* Not including the concentric termination.
30' (9.0m)
36' (10.8m)
42' (12.6m)
148' (14.4m)
Maximum Vent Length Adjustment Dip switches.
3
6
9
12
15
18
21
24
27
30
33
36
39
42
45
48
51
54
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
m10234ft
Vent lengthElbows
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Number of
pieces*
4” Pipe
<Maximum Vent Length and Reduced Input Configurations>
1
2
Short length using 4" (100mm)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.
2
The BTUH input of the
appliance will be reduced
by up to 2%.
1
The BTUH input of the
appliance will be reduced
by up to 2%.
Horizontal
Vertical
Hanger
4" (100mm)
Intake
4" (100m
m )
Exhaust
Straps
Slope the
Vent Upward
Strap
1" (25mm) to
2" (50mm)
Insert Bird Screen **
in End of Termination
** Not supplied with
water heater,
order separately.
12"(30cm)
4"(100mm)
Exhaust*
4"(100mm)
Intake*
4" pipe
> 1 ft. Min.
=
•
•
•
•
•
•
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.
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 Te chnical Bulletin TB 010606 for full
installation instructions.
•
•
•
•
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.
Do not exceed the maximum vent lengths as
specified in this section.
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.
•
Install a securing strap to prevent movement of the 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.
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.
4" (100mm ) PVC Concentric Termination
IPEX Concentric Vent Kits : 196021
Plastic Rain Cap**
(PRC-1)
**Not supplied with water
heater, order separately.
4" pipe
4"x4" coupling
4" pipe
4"x4" coupling

18
Vertical Vent Termination
Firestop
Firestop/Support
Roof
Flashing
Storm
Collar
Hanger
Strap
Horizontal Vent Termination
Hanger
Straps
Slope the
Vent Upward Insert Bird
Screen* in
Each End
of Tee
Support
* Not supplied with water
heater, order separately.
1' (0.3m) minimum
recommended, but not required.
* Not supplied with water
heater
, order separately.
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 installation
instructions.
Terminate at least 3’ (0.9m) from the combustion air intake
of any appliance andany other building opening.
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
Inlet screen
SV Conversion Kit
Accessory
(#SV-CK-4)
90 Elbow
Inlet screen
SV Conversion Kit
Accessory
(#SV-CK-4)
3” Min.
Insert Bird
Screen* in
End of 90
Elbow
Slope the
Vent Upward
When using 4" PP pipe
4" PP Adapter
ISAAN0404
4" pipe
4" pipe
When using 4" PVC/CPVC pipe
4"x4" coupling
When using 4" PP pipe
4" PP Adapter
ISAAN0404
4" pipe
4" pipe
When using 4" PVC/CPVC pipe
4"x4" coupling
Vent Pipe Installation (When supplying combustion air from the indoors (SV, non-direct vent))
* Dip switch No.3 is turned on.
• 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 11 for the location of the dip switch bank.
• SV Conversion kit #SV-CK-4 is required for the air intake.
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
Horizontal Vent Termination
V
ertical Vent Termination
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
When using PP pipe, replace 5" Stainless Steel Vents
and the termination. See the previous page.
4" PVC to 5" SS Vent Adapter (PVC4XVP5-ADAPT) is
required to connect with 5" stainless steel vent.
Replace 5" Stainless Steel Vents with 4" PVC/CPVC as
possible. If stainless steel vents exist, seal stainless
steel Joints with high temperature silicon sealant to
prevent possible condensate leakage.
Noritz recommends this venting configuration strongly.
Provide vertical support every 3' (0.9m) or as required
by the vent pipe manufacturer's instructions.
Slope the horizontal vent 1/4" downwards 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.
4" PVC to 5" SS Vent Adapter (PVC4XVP5-ADAPT) is
required to connect with
5" stainless steel vent.
When using 4" PP pipe, two 4" PP Adapter (ISAAN0404)
are required.
To transition to existing 5" stainless steel vent with the
4" PP adapter, a section (1 ft. or more) of PP pipe
(male x male) must be used. Refer to figure on left.
Replace 5" Stainless Steel V
ents with 4" PVC/CPVC or
PP as possible. If stainless steel vent exist, seal stainless
steel Joints with high temperature silicon sealant to prevent
possible condensate leakage.
Noritz recommends this venting configuration strongly.
When the vent penetrates a floor or ceiling and is not
running in a fire rated shaft, a firestop and support is required.
Provide vertical support every 3' (0.9m) or as required
by the vent pipe manufacturer's instructions.
Slope the horizontal vent 1/4" upwards for every 12" (300mm).
Use a condensation drain if necessary.
Intake
90 Elbow
Inlet screen
SV Conversion Kit
Accessory
(#SV-CK-4)
5" pipe
Intake
Exhaust
90 Elbow
Inlet screen
SV Conversion Kit
Accessory
(#SV-CK-4)
* Not supplied with water
heater, order separately.
1' (0.3m) minimum
recommended, but not required.
* Not supplied with water
heater, order separately.
1' (0.3m) minimum
recommended, but not required.
PVC4XVP5-ADAPT
Elbow
Hanger
Straps
Wall
Thimble
Termination
Slope the
Vent Downward
Firestop
Firestop/
Support
Roof
Flashing
Roof
Jack
Storm
Collar
Rain
Cap
Hanger
Strap
Elbow
5" pipe
4" pipe
4" pipe
When using 4" PVC/CPVC pipe
4"x4" coupling
When using 4" PP pipe
4" PP Adapter
ISAAN0404
4" pipe
4" pipe
When using 4" PVC/CPVC pipe
4"x4" coupling
When using 4" PP pipe
4" PP Adapter
ISAAN0404
End Pipe PPs-UV
(ISEP04) or a cut
4" vent pipe
(both male-end)
PP pipe
(female-end)
Slope the
Vent Upward
4"x4" coupling
PVC4XVP5-ADAPT
4"x4" coupling
Vent Pipe Installation (When using 5" vent pipe to replace the existing model)
(When supplying combustion air from the indoors (SV, non-direct vent))
* Dip switch No.3 is turned on.
• 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 11 for the location of the dip switch bank.
• SV Conversion kit #SV-CK-4 is required for the air intake.
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, di-
rect-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

20
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
H
W
W
Provide adequate combustion air so as to not create negative pressure within the building.
• 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 105 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
300 in2
20" (W) x 15" (H)
75 in2
10" (W) x 7 1/2" (H)
150 in2
20" (W) x 7 1/2" (H)