Noritz NCC199-SV 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
Requests to Installers
• In order to use the water heater safely, read this installation manual carefully, and follow the
installation instructions.
•Failures and damage caused by erroneous work or work not as instructed in this manual are not
covered by the warranty.
• Check that the installation was done properly in accordance with this Installation Manual upon
completion.
• After completing installation, please either place this Installation Manual in a plastic pouch and
attach it to the side of the water heater (or the inside of the pipe cover or recess box if applicable),
or hand it to the customer to retain for future reference. Also, be sure to fill in all of the required
items on the warranty and to hand the warranty to the customer along with the Owner's Guide.
WARNING: If the information in this manual is not followed exactly, a fire or explosion may result
causing property damage, personal injury or death.
NORITZ AMERICA
CORPORATION
Installation Manual
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
CAUTION
WARNING
CAUTION
KS-09-0010
Rev. 10/09
NCC199-SV (Indoor/Outdoor Installation)
CONDENSING TANKLESS GAS WATER HEATER
Canada
CERTIFIED
R
Installation must conform with local codes, or in the absence of
local codes, the National Fuel Gas Code, ANSI Z223.1/NFPA
54- latest edition and/or CSA B149.1, Natural Gas and Pro-
pane Installation Code (NSCNGPIC).
Noritz America reserves the right to discontinue, or change at
any time, the designs and/or specifications of its products with-
out notice.
* ENERGY STAR®applies when used in a combination potable
water heating and space heating system.

2
1. Included Accessories
The following accessories are included with the unit.
Check for any missing items before starting installation.
Q’tyShapePart
Tapping Screw 1
each
Part Shape Q’ty
5
1
Remote Controller
(See p. 25) Remote Controller
Cord (3m(10'))
1
2. Optional Accessories
The accessories listed below are not
included with the units, but may be necessary
for installation.
Owner's Guide, Warranty,
Installation Manual
(this document)
Outdoor Vent Cap
(VC4C) 1Quick Connect Cord
Q’tyShapePartPart Shape Q’ty
1
1
Remote Controller
Cord (8m(26'))
1
Isolation Valves
(includes pressure
relief valve)
1
Remote Controller
Outdoor
Junction Box
System Controller 1
1
1
100mm (4")
PVC Adapter
VP4-ADAPT-PVC
75mm (3")
PVC Adapter
VP4x3-ADAPT-PVC
Bird Screen for
100mm (4") PVC
VT4-PVCS
Bird Screen for
75mm (3") PVC
VT3-PVCS
1
1
Pipe Cover
(PC-3S-SUS) 1

3
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
The Quick Connect Cord is 2m (6'). long. Install the units 152 - 457mm (6-18") 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).
* 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.
Union
Make this distance as short
as possible.
* The hot water temperature
will become unstable as the
pipe length increases.
Quick Connect
Cord
Union
Gas Valve
Union
Shutoff
Valve
Shutoff Valve
Hot Water
Shutoff
Valve
Cold Water
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.
Size the piping to allow for the maximum
flow rates of the units.
Distance at center:
617 - 922mm (24.3 - 36.3").
Distance on sides
152 - 457mm (6 - 18").

4
4. Before Installation
Checkup
• Check the fixing brackets and vent pipe yearly for damage or wear. Replace if necessary.
DANGER
Do Not Use Equipment for Purposes Other Than Those Specified
•Do not use for other than increasing the temperature of the water supply, as unexpected accidents
may occur as a result.
Check Water Supply Quality
•If the water supply is in excess of 12 grains per gallon (200 mg/L) of hardness, acidic or otherwise
impure, treat the water with approved methods in order to ensure full warranty coverage.
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
199,900 Btuh for this unit.
Check the Power
•The power supply required is 120VAC, at 60Hz.
May result in fire or electric shock.
Use Extreme Caution if Using With a Solar Pre-Heater
• Using this unit with a solar pre-heater can lead to unpredictable output temperatures and
possibly scalding. If absolutely necessary, use mixing valves to ensure output temperatures do
not get to scalding levels. Do not use a solar pre-heater with the quick-connect multi-system.
199,900
186 000186,000
3.6
3.05 3.05
3.6
192,700
179 300179,300
199,900 BTU
11,000 BTU 222
4.0
0.85 3.05
10.5
840
10.3a-2007
15 150
4.3a-2007
4
NCC199-SV

5
5. Choosing Installation Site
* Locate the appliance in an area where leakage from the unit or connections will not result in damage
to the area adjacent to the appliance or to the lower floors of the structure. When such locations
cannot be avoided, it is recommended that a suitable drain pan, adequately drained, be installed
under the appliance. The pan must not restrict combustion air flow.
• Install the exhaust vent so that there are no obstacles around the termination and so that
exhaust can't accumulate. Do not enclose the termination with corrugated metal or other
materials.
•Avoid places where fires are common, such as those where gasoline,
benzene and adhesives are handled, or places in which corrosive gases
(ammonia, chlorine, sulfur, ethylene compounds, acids) are present.
Using the incorrect voltage may result in fire or cracking.
•Avoid installation in places where dust or debris will accumulate.
Dust may block the air-supply opening, causing the performance of the
device fan to drop and incomplete combustion to occur as a result.
•Avoid installation in places where special chemical agents
(e.g., hair spray or spray detergent) are used.
Ignition failures and malfunction may occur as a result.
• Carbon Monoxide Poisoning Hazard. Do not install this water heater in a
mobile home, recreation vehicle or on a boat.
Prohibited
DANGER
WARNING

6
• Install in a location where the exhaust gas flow will not be affected by fans or range hoods.
•Take care that noise and exhaust gas will not affect neighbors. Avoid installation on common
walls as the unit will make some operational noises while it is running.
•Before installing, make sure that the vent termination (or the vent
cap in an outdoor installation) will have the proper clearances
according to the National Fuel Gas Code (ANSI Z223.1).
Be sure to do
Prohibited
Prohibited
CAUTION
•Consult with the customer concerning the location of installation.
• 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.
•Install the water heater in a location where it is free from obstacles
and stagnant air.
•Do not install the water heater near staircases or emergency exits.
• Do not locate the vent termination directed towards a window or any
other structure which has glass or wired glass facing the termination.
• Avoid installation where the unit will be exposed to excessive winds.
[For outdoor installation only]
[For indoor installation only]
•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.
•Make sure that the location allows installation of the exhaust
vent as specified.
•For outdoor installation, use the outdoor vent cap (#VC-4C only).
If it is necessary to vent above the roof line in an outdoor
installation, use high temperature sealant around the flue collar
for rain protection.
State of California: The water heater must be braced, anchored or strapped to avoid moving during an
earthquake. Contact local utilities for code requirements in your area or call: 1-866-766-7489 and request
instructions.
The Commonwealth of Massachusetts: The water heater can be used for hot water only and not in a
combination of domestic and space heating.
For Venting Manufacturers Requirements, see websites or phone numbers listed below:
Noritz N-Vent www.noritz.com

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 NSCNGPIC for detailed requirements.
Item
Required Clearances
From Heater
•Maintain the following clearance from
both combustible and non-combustible
materials.
Check Illustration
Securing of space for
repair/inspection
600mm
(24") or
more
200mm
(8") or
more
• If the unit will be installed in the vicinity of a
permanent kitchen range or stove that has
the possibility of generating steam that
contains fats or oils, use a dividing plate or
other measure to ensure that the unit is not
exposed to air containing such impurities.
* The dividing plate should be of noncombust-
ible material of a width greater than the
water heater.
Exhaust hood
Range
Dividing plate Water
heater
Cooking Equipment
WARNING
200mm
(8") or
more
300mm (12") or more
(Indoor)
900mm (36") or more
(Outdoor)
100mm (4") or more
(Indoor)
600mm (24") or more
(Outdoor)
150mm (6") or more
(
Indoor/ Outdoor)
•If possible, leave 200mm (8") or more on
either side of the unit to facilitate inspection.
•If possible, leave 600mm (24") or more in
front of the unit to facilitate maintenance
and service if necessary.
•If possible, leave 75mm (3") or more above
and below the vent pipe to facilitate inspec-
tion and repair if necessary.
75mm (3") or more
75mm (3") or more

8
Vent Terminal
Clearance
A= Above grade, veranda, porch, deck,
or balcony
B= Window or door that may be opened
C= Permanently closed window
D=
Vertical clearance to ventilated soffit
located above the terminal within a
horizontal distance of 0.6m
( 2 ') from
the center of the terminal
*
E= Unventilated soffit *
F= Outside corner *
G= Inside corner *
H= Each side of center line extended
above meter/regulator assembly
0.9m (3') within a height 4.5m (15')
above meter/regulator assembly 0.9m (3') within a height 4.5m (15') above meter/regulator assembly
I= Service regulator vent outlet 0.9m (3')
J= Nonmechanical air supply inlet or
combustion air inlet to any other
appliance
1.2m (4') below or to the side of
opening, or 0.3m (1') above
opening [900mm (36")]
1.2m (4') below or to the side of
opening, or 0.3m (1') above
opening [900mm (36")]
K= Mechanical air supply inlet 0.9m (3') above if within
3m (10') [1.8m (6')]
0.9m (3') above if within
3m (10') [1.8m (6')]
L= Above paved sidewalk or paved
driveway located on public property
Under veranda, porch, deck, or
balcony
[2.1m *** (7' ***)]
M=
[ ]= indicates clearances required in Canada
* Maintain clearances in accordance with local installation codes and the requirements of the gas supplier
*** 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.
*[300mm (12") - Canada Only****] *[300mm (12") - Canada Only****]
*
300mm (12") [300mm (12")]300mm (12") [300mm (12")]
300mm (12") [900mm (36")]
300mm (12") [900mm (36")]
*
*
*
*
0.9m (3')
[2.1m *** (7' ***)]
*
Indoor Installation
(See p.9)
Outdoor Installation
(See p.9)
Air Supply Inlet
Area Where Terminal
is Not Permitted
Clearance Requirements from Vent Terminations to Building Openings
*All clearance requirements are in accordance with ANSI Z21.10.3 and the National Fuel Gas Code,
ANSI Z223.1 and in Canada, in accordance with NSCNGPIC.

9
Vent Clearances When Heater is In-
stalled Indoors
•1.2m (4') below, 1.2m (4') horizontally from,
or 0.3m (1') above any door, operable win-
dow, or gravity air inlet into any building.
0.9m (3') above any forced air inlet within
3m (10').
Maintain the following clearances to any
opening in any building: Illustration
(Noritz vent cap, VC-4C)
• 0.3m (1') below, 0.3m (1') horizontally from,
or 0.3m (1') above any door, operable
window, or gravity air inlet into any building.
0.9m (3') above any forced air inlet within
3m (10').
Vent Clearances When Heater is Installed
Outdoors With a Vent Cap
*All clearance requirements are in accordance with ANSI Z21.10.3 and the National Fuel Gas Code,
ANSI Z223.1 and in Canada, in accordance with NSCNGPIC.
* For Installations in Canada, clearances are as follows: To windows, doors, & gravity air inlets: 900mm (36").
To forced air inlets: 1.8m (6'). These clearance requirements hold true for all of the above situations: Indoor,
Outdoor w/vent cap.
0.9m (3')
0.3m (1')
1.2m (4')
1.2m (4')
Clearance Requirements from Vent Terminations to Building Openings
0.3m (1') 0.3m (1')
0.9m (3')
0.3m (1')

10
Illustration
7. Installation
Check
4. Drill holes for the remaining four screws.
5. Hang the unit again by the first screw, and then
insert and tighten the remaining four screws.
6. Take waterproofing measures so that water does
not enter the building from screws mounting the
device.
•Make sure the unit is installed securely so that it will
not fall or move due to vibrations or earthquakes.
Securing to the wall
Mounting Bracket
(upper)
Tapping Screw
Location of Screw Hole
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 suffi-
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
Locating Screw Holes
Mounting
Structure
•When installing with bare hands, take caution to
not inflict injury.
•Be careful not to hit electrical wiring, gas, or water
piping while drilling holes.
Item
CAUTION
Be sure to do
•If this water heater is being installed at an elevation of
610m (2,000') or higher, disconnect the connector la-
beled "High Elevation Disconnect" as illustrated on the
right. This connector is located inside the unit.
Installations at Elevations
Above 610m (2,000').
HIGH ELEVATION
DISCONNECT
•Disconnect power to the water heater before discon-
necting this connector. Failure to perform this step will
result in a "73" code displayed on the remote controller
and a cease in operation. If this occurs, disconnect,
then reconnect power to the water heater to reset the
system.

11
Filling the neutralizer unit with water
The neutralizer unit can be filled before connecting the vent pipe.
Filling the neutralizer unit before vent pipe installation.
DANGER
Prior to initial start up, make sure that you fill the neutralizer unit with water.
This is to prevent dangerous exhaust gases from entering the building.
Failure to fill the neutralizer unit could result in severe personal injury or death.
Please follow one of the procedures described below to ensure that the neutralizer unit is filled with water.
1) Fill the neutralizer unit by pouring approx. 17 oz.(500ml) 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.)
17 oz.
500ml

12
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 NSCNGPI.
8. Vent Pipe Installation (Indoor Installation Only)
•This appliance may be vented with either PVC
or CPVC, or stainless steel materials. Follow
the instructions in this section for the specific
material being used.
•Make sure the vent system is gas tight and will
not leak.
•Support the vent pipe with hangers at regular
intervals as specified by these instructions or
the instructions of the vent manufacturer.
•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
0.9m (3').
•Do not store hazardous or flammable sub-
stances near the vent termination and check
that the termination is not blocked in any way.
•Steam or condensed water may come out
from the vent termination. Select the location
for the termination so as to prevent injury or
property damage.
•If snow is expected to accumulate, take care
the end of the pipe is not covered with snow or
hit by falling lumps of snow.
•Consult the vent pipe manufacturer's installa-
tion instructions for chimney connections.
Optional Stainless Steel Vent Piping
• Noritz N-Vent is suggested when stainless steel
venting is required.
•If N-Vent is not used, a UL listed category IV vent
system must be used.
•An adapter may be required if stainless steel
venting is used on this appliance. Refer to the
"Appliance Adapters" section.
* Not including the termination
•Exceeding the maximum vent length is danger-
ous and may result in bad combustion.
•Maintain the same vent pipe diameter from the
heater flue to the vent termination.
General Requirements
Pipe diameter 100mm (4")
No. of Elbows Max. Straight Vent Length*
34.6m (15')
28.2m (27')
112.0m (39')
Clearances
Clearances vary by manufacturer, refer to the UL
approved clearances when using materials other
than N-Vent.
Appliance Adapters
When using a vent system other than N-Vent, an
appliance adapter will be required to properly con-
nect the vent to this appliance. Consult the
manufacturer's instructions for the proper appli-
ance adapter.
Manufacturer and Enclosed Unenclosed
Product Hor. Vert. Hor. Vert.
Noritz N-Vent 100mm
(4") 25mm
(1") 25mm
(1")
250mm (10") (sides)
375mm (15") (top)
150mm (6") (bottom)

13
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
Exhaust Vent
Schedule 40 PVC ANSI/ASTM D1785
ULC 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: Do Not Use Cellular Foam Core Pipe
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 pages 12 and 14 of this Installation Manual.
• The pipe shall be installed so that the first 0.9m (3') 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.
• All piping must be fully supported. Use pipe hangers at a minimum of 0.9m (3') intervals. Do not use
the water heater to support the vent piping.
• PVC or CPVC pipe has been approved for use on this appliance with zero clearance to combustibles.
75mm (3") PVC or CPVC schedule 40 pipe may also be used on this appliance, however the
BTUH input of the appliance will be reduced by up to 5%. Refer to page 14 for additional instructions.
• When attaching the piping to the water heater, a Noritz PVC/CPVC adapter must be used. This
adapter is not supplied with the water heater and must be purchased separately (part #VP4-ADAPT-PVC,
use part #VP4x3-ADAPT-PVC when using 75mm (3") PVC or CPVC). It is not necessary to use cement
or silicone on this adapter as it is self sealing.
• A bird screen must be installed on the vent termination to prevent debris or animals from entering
the piping. This screen is not supplied with the water heater and must be purchased separately
(part #VT4-PVCS, use part #VT3-PVCS when using 75mm (3") PVC or CPVC).
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. This appliance
may also be vented with materials approved for Category IV appliances; refer to page 15 for instructions.

14
Vertical Vent Termination- PVC/CPVC Materials Only
Firestop
Firestop/Support
Roof
Flashing
Storm
Collar
Hanger
Strap
PVC/CPVC
Adapter*
* Not supplied with water
heater, order separately.
•
•
•
•
•
•
•
Horizontal Vent Termination- PVC/CPVC Materials Only
•
•
•
•
•
•
•
PVC/CPVC
Adapter*
Hanger
Straps
**0.3m (1')
Minimum
Slope vent
Upwards
* Not supplied with water
heater, order separately.
**0.3m (1') minimum
recommended, but not required.
Insert Bird
Screen* in
Each End
of Tee
Support
Insert Bird
Screen* in
End of 45°
Elbow
PVC/CPVC
Coupling
PVC/CPVC
Coupling
Slope vent
Upwards
Pipe Material PVC or CPVC
Max. Straight Vent Length ***
3 4.6m (15') 0.9m (3')
No. of Elbows 100mm (4") Pipe 75mm (3") Pipe
2 8.2m (27') 3m (10')
1 12.0m (39') 5.1m (17')
Terminate at least 300mm (12") above
grade or above snow line.
Terminate at least 2.1m (7') above a public
walkway, 1.8m (6') from the combustion air
intake of any appliance, and 0.9m (3') from
any other building opening, gas utility
meter, service regulator etc.
Te r minate at least 0.9m (3') above any
forced air inlet within 3m (10'), 1.2m (4')
below, 1.2m (4') horizontally from or 0.3m
(1') above any door, window, or gravity
air inlet into any building per National
Fuel Gas Code ANSI Z223.1/NFPA 54 .
A tee or 45°elbow may be used for the
termination.
Slope the horizontal vent 1/4" upwards for
every 300mm (12") 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.
**0.3m (1')
Minimum
**0.3m (1') minimum
recommended, but not required.
Te r minate at least from the combustion air
intake of any appliance, and 0.9m (3') 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 2.4m (8') from a vertical wall or
similar obstruction, terminate above the
roof at least 0.6m (2'), but not more than
1.8m (6'), in accordance with the National
Fuel Gas Code ANSI Z223.1/NFPA 54.
Provide vertical support every 0.9m (3') 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
300mm (12") toward the termination to
drain condensate.
***Not including the termination.

15
Vertical Vent Termination- Stainless Steel Materials Only
Firestop
Firestop/
Support
Roof
Flashing
Roof
Jack
Storm
Collar
Rain
Cap
Hanger
Strap
Elbow
**0.3m (1') Min.
** 0.3m (1') minimum recommended,
but not required. Avoid installing
elbow directly on flue.
using Noritz N-Vent stainless
steel vent pipe.
Slope vent
Upwards
Appliance
Adapter*
* Adapter not required when
Horizontal Vent Termination- Stainless Steel Materials Only
•Terminate at least 300mm (12") above
grade or above snow line.
•Terminate at least 2.1m (7') above a public
walkway, 1.8m (6') from the combustion air
intake of any appliance, and 0.9m (3') from
any other building opening, gas utility meter,
service regulator etc.
•Terminate at least 0.9m (3') above any
forced air inlet within 3m (10'), 1.2m (4') be-
low, 1.2m (4') horizontally from or 0.3m (1')
above any door, window, or gravity air inlet
into any building per National Fuel Gas Code
ANSI Z223.1/NFPA 54.
•Slope the horizontal vent 1/4" downwards
for every 300m (12") 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 equip-
ment. Please refer to Technical Bulletin TB
010606 for full installation instructions.
Elbow
Hanger
Straps
Wall
Thimble Ter mination
Slope vent
Upwards
** 0.3m (1') minimum recommended,
but not required. Avoid installing
elbow directly on flue.
Appliance
Adapter*
**
0.3m (1') Min.
* Adapter not required when
using Noritz N-Vent stainless
steel vent pipe.
•Terminate at least 1.8m (6') from the com-
bustion air intake of any appliance, and
0.9m (3') 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 2.4m (8') from a vertical wall or
similar obstruction, terminate above the roof
at least 0.6m (2'), but not more than 1.8m
(6'), in accordance with the National Fuel
Gas Code ANSI Z223.1/NFPA 54.
•Provide vertical support every 3.6m (12') or
as required by the vent pipe manufacturer's
instructions.
•Ashort 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 300m
(12") toward the termination.
•Use a condensation drain if necessary.

16
•Provide two permanent openings to allow
circulation of combustion air.
•Make each opening 199 square inches if they
provide indoor air, and 100 square inches for
outdoor air.
•If the unit is installed in a mechanical closet,
provide a 600mm (24") clearance in front of
the unit to the door.
•If combustion air will be provided through a
duct, size the duct to provide 60 cubic feet of
fresh air per minute.
Supply combustion air to the units as per the National Fuel Gas Code, ANSI Z223.1 and
in Canada, in accordance with NSCNGPIC.
Combustion Air
Openings supplying indoor air
250mm (10")
250mm (10")
500mm (20")
500mm (20")

17
Gas Meter
Select a gas meter capable of supplying the entire
btuh demand of all gas appliances in the building.
Gas Connection
•Do not use piping with a diameter smaller than
the inlet diameter of the water heater.
•Gas flex lines are not recommended unless they
are rated for 199,900 btuh.
•Install a gas shutoff valve on the supply line.
•Use only approved gas piping materials.
Follow the instructions from the gas supplier.
Gas Pressure
Size the gas line according to total btuh demand
of the building and length from the meter or
regulator so that the following supply pressures
are available even at maximum demand:
Natural Gas Supply Pressure
Min. 4" WC
Max. 10.5" WC
LP Gas Supply Pressure
Min. 8" WC
Max. 14" WC
9. Gas Piping
The appliance and its individual shutoff valve must be disconnected from the gas supply piping system
during any pressure testing of that system at test pressures in excess of 1⁄2psig (3.5 kPa).
The Appliance must be isolated from the gas supply piping system by closing its individual manual shutoff
valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1⁄2
psig (3.5 kPa).
The appliance and its gas connections must be leak tested before placing the appliance in operation.
The inlet gas pressure must be within the range specified. This is for the purposes of input adjustment.
In order to choose the proper size for the gas line, consult local codes or the National Fuel Gas Code ANSI
Z223.1.
Natural Gas
Meter **See next page for the pipe capacity charts.
Noritz Condensing Tankless Gas Water Heater
(199,900 Btuh)
Clothes Dryer
(35,000 Btuh)
Barbecue
(50,000 Btuh)
Gas Range Stove
(65,000 Btuh)
3m (10') 3m (10')
1.5m (5')
1.5m (5')
1.5m (5')
1.5m (5')
3m (10')
3m (10') Gas Fireplace
(25,000 Btuh)
Instructions
1. Size each outlet branch starting from the furthest
using the Btuh required and the length from the
meter.
2. Size each section of the main line using the
length to the furthest outlet and the Btuh
required by everything after that section.
Sample Gas Line
Sample Calculation
Outlet A: 13.5m (45') (Use 15m (50')), 50,000 Btuh requires 1/2"
Outlet B: 12m (40'), 65,000 Btuh requires 1/2"
Section 1: 13.5m (45') (Use 15m (50')), 115,000 Btuh requires 3/4"
Outlet C: 9m (30'), 35,000 Btuh requires 1/2"
Section 2: 13.5m (45') (Use 15m (50')), 150,000 Btuh requires 3/4"
Outlet D: 7.5m (25') (Use 9m (30')), 25,000 Btuh requires 1/2"
Section 3: 13.5m (45') (Use 15m (50')), 175,000 Btuh requires 1"
Outlet E: 7.5m (25') (Use 9m (30')), 199,900 Btuh requires 3/4"
Section 4: 13.5m (45') (Use 15m (50')), 374,900 Btuh requires 1-1/4"
Section 3 Section 2 Section 1
Outlet A
Outlet B
Outlet C
Outlet D
Outlet E
1.5m (5') 1.5m (5')
Section 4
Measuring Gas Pressure
In order to check the gas supply pressure to the unit, a
tap is provided on the gas inlet. Remove the hex head
philips screw from the tap, and connect a manometer
using a silicon tube.
In order to check the gas manifold pressure, a pair of
taps are provided on the gas valve inside the unit.
The pressure can be checked either by removing the hex
head philips screw and connecting a manometer with a
silicon tube, or by removing the 1/8" NPT screw with an
allen wrench and connecting the appropriate pressure
gauge.

18
Maximum Natur
Natur
al Gas Delivery Capacity in Cubic Feet per Hour (0.60 Specific Gravity, 0.5" WC Pressure Drop)
Contact the Gas Supplier for Btu/Cubic Ft. of the Supplied Gas. 1000 BTU/Cubic Ft. is a Typical Value
Maximum Liquified P
Liquified P
etroleum (Undiluted) Delivery Capacity in Thousands of Btuh (0.5" WC Pressure Drop)
Length in Feet
Length in Feet
Pipe
Size
Pipe
Size
1/2"
1/2"
3/4"
3/4"
1"
1"
1 1/4"
1 1/4"
1 1/2"
1 1/2"
2"
2"
2 1/2"
3"
3 1/2"
4"
174
363
684
1404
2103
4050
6455
11,412
16,709
23,277
119
249
470
965
1445
2784
4437
7843
11,484
15,998
96
200
377
775
1161
2235
3563
6299
9222
12,847
Adapted from UPC 1997
82
171
323
663
993
1913
3049
5391
7893
10,995
73
152
286
588
880
1696
2703
4778
6995
9745
66
138
259
532
798
1536
2449
4329
6338
8830
61
127
239
490
734
1413
2253
3983
5831
8123
56 53 50 44
118 111 104 93
222 208 197 174
456
683
1315
2096
3705
5425
7557
428
641
1234
1966
3476
5090
7091
404
605
1165
1857
3284
4808
6698
358
536
1033
1646
2910
4261
5936
275
567
1071
2205
3307
6221
189
393
732
1496
2299
4331
152
315
590
1212
1858
3465
129
267
504
1039
1559
2992
114
237
448
913
1417
2646
103
217
409
834
1275
2394
96
196
378
771
1181
2205
89
185
346
724
1086
2047
83
173
322
677
1023
1921
78
162
307
630
976
1811
69
146
275
567
866
1606
63
132
252
511
787
1496
55
112
213
440
675
1260
Maximum Capacity of Flex TracPipe in Cubic Feet per Hour of Natural Gas (0.60 Specific Gravity, 0.5" WC Pressure Drop)
Length in Feet
Pipe
Size
3/4"
1"
1 1/4"
1 1/2"
2"
206
383
614
1261
2934
147
269
418
888
2078
121
218
334
723
1698
105
188
284
625
1472
94
168
251
559
1317
86
153
227
509
1203
80
141
209
471
1114
75
132
194
440
1042
71
125
181
415
983
67
118
171
393
933
55
94
137
320
762
48
82
116
277
661
R
Maximum Capacity of Flex TracPipe in Thousands of Btuh Liquified Petroleum ( 0.5" WC Pressure Drop)
Length in Feet
Pipe
Size
3/4"
1"
1 1/4"
1 1/2"
2"
325
605
971
1993
4638
232
425
661
1404
3285
191
344
528
1143
2684
166
297
449
988
2327
149
265
397
884
2082
136
241
359
805
1902
126
222
330
745
1761
118
208
307
696
1647
112
197
286
656
1554
106
186
270
621
1475
87
143
217
506
1205
76
129
183
438
1045
R
** For reference only. Please consult gas pipe manufacturer for actual pipe capacities.
** For reference only. Please consult gas pipe manufacturer for actual pipe capacities.
Maximum Capacity for Gas Flex Connectors in Cubic Feet per Hour of Natural Gas (0.60 Specific Gravity, 0.5" WC Pressure Drop)
Length in Inches
Pipe
Size
1/2"
3/4"
1"
1 1/4"
180 150
290
581
1470
125
255
512
1200
106
215
442
1130
93
197
397
960
86
173
347
930
Length in Inches
Pipe
Size
1/2"
3/4"
1"
1 1/4"
288 240
465
930
2352
200
409
825
1920
169
344
708
1808
149
315
638
1536
137
278
556
1488
Maximum Capacity for Gas Flex Connectors in Thousands of Btuh Liquified Petroleum ( 0.5" WC Pressure Drop)
** For reference only. Please consult gas pipe manufacturer for actual pipe capacities.
TracPipe® is a registered trademark of Omega Flex.
3m (10') 6m (20') 9m (30') 12m (40') 15m (50') 18m (60') 21m (70') 24m (80') 27m (90') 37.5m (125') 30m (100')
3m (10') 6m (20') 9m (30') 12m (40') 15m (50') 18m (60') 21m (70') 24m (80') 27m (90') 30m (100') 60m (200') 37.5m (125') 45m (150')
60m (200')
3m (10') 6m (20') 9m (30') 12m (40') 15m (50') 18m (60') 21m (70') 24m (80') 27m (90') 30m (100') 45m (150')
60m (200')
3m (10') 6m (20') 9m (30') 12m (40') 15m (50') 18m (60') 21m (70') 24m (80') 27m (90') 30m (100') 45m (150')
300mm (12") 600mm (24") 900mm (36") 1200mm (48") 1500mm (60") 1800mm (72")
300mm (12") 600mm (24") 900mm (36") 1200mm (48") 1500mm (60") 1800mm (72")
Gas Line Sizing for a Noritz Condensing Tankless Gas Water Heater

19
10. Water Piping
This appliance is suitable for potable water and space heating applications. Do not use this appliance if any part has
been underwater. Immediately call a qualified service technician to inspect the appliance and replace any part of the
control system and gas control which has been under water.
If the water heater is installed in a closed water supply system, such as one having a backflow preventer in the cold
water supply line, means shall be provided to control thermal expansion. Contact the water supplier or a local plumb-
ing inspector on how to control this situation.
A pressure relief valve must be installed near the hot water outlet that is rated in accordance with and complying with
either The Standard for Relief Valves and Automatic Shutoff Devices for Hot Water Supply Systems, ANSI Z21.22, or
The ANSI/ASME Boiler and Pressure Vessel Code, Section IV ( Heating Boilers ). This pressure relief valve must
be capable of an hourly Btu rated temperature steam discharge of 199,900 Btuh. Multiple valves may be used. The
pressure relief capacity must not exceed 150 psig. No valve shall be placed between the relief valve and the water
heater. The relief valve must be installed such that the discharge will be conducted to a suitable place for disposal
when relief occurs. No reducing coupling or other restriction may be installed in the discharge line. The discharge line
must be installed to allow complete drainage of both the valve and the line. If this unit is installed with a separate
storage vessel, the separate vessel must have its own temperature and pressure relief valve. This valve must also
comply with The Standard for Relief Valves and Automatic Gas Shutoff Devices for Hot Water Supply Systems, ANSI
Z21.22. (in the U.S. only). A temperature relief valve is not required, but if one is used, do not install the valve with the
probe directly in the flow of water. This may cause unwarranted discharge of the valve.
Piping and components connected to the water heater shall be suitable for use with potable water.
Toxic chemicals, such as those used for boiler treatment, shall not be introduced into the potable water.
A water heater used to supply potable water may not be connected to any heating system or components previously
used with a nonpotable water heating appliance.
When water is required in one part of the system at a higher temperature than in the rest of the system, means such
as a mixing valve shall be installed to temper the water to reduce the scald hazard.
Installation and service must be performed by a qualified plumber. In the
Commonwealth of Massachusetts, this product must be installed by a licensed
plumber or gas fitter in accordance with the Massachusetts Plumbing and Fuel
Gas Code 248 CMR Sections 2.00 and 5.00. Observe all applicable codes.
• Flush water through the pipe to clean out metal powder, sand and dirt before connecting it.
• Perform the following insulation measures for prevention of freezing.
•Take appropriate heat insulation measures (e.g., wrapping with heat
insulation materials, using electric heaters) according to the climate of
the region to prevent the pipe from freezing.
•Make sure that there are no water leaks from the cold and hot water
supply pipes, then insulate the pipes completely.
•Be sure to also completely insulate the water supply valve and the
cold and hot water connections on the water heater (refer to the figure
on the right).
•Do not cover the water drain plug with insulation so that water in the
pipe can be drained. (Refer to the figure in the right.)
•
Use a union coupling or flexible pipe for connecting the pipes to reduce the force applied to the piping.
• Do not use piping with a diameter smaller than the coupling.
• When feed water pressure is too high, insert a depressurizing valve, or take water hammer prevention measure.
• Avoid using joints as much as possible to keep the piping simple.
• Avoid piping in which an air holdup can occur.
•If installing the unit on a roof:
•About lower-level hot water supply
If the unit is installed on a roof to supply water to the levels below, make sure that the water pressure supplied to
the unit does not drop below 29 psi. It may be necessary to install a pump system to ensure that the water pressure
is maintained at this level.
Check the pressure before putting the unit into operation.
Failure to supply the proper pressure to the unit may result in noisy operation, shorter lifetime of the unit, and may
cause the unit to shut down frequently.
Completely insulate
the water inlet and
outlet fittings.
Insulate the water
supply valve completely.
Do not cover the water
drain plug with insulation
so that water in the pipe
can be drained.

20
Supply water piping
• Do not use PVC, iron, or any piping which has been
treated with chromates, boiler seal or other chemicals.
• Mount a check valve and a shut off valve (near the inlet).
•In order for the client to use the water heater
comfortably, 98.1 to 491 kPa (14 to 70 PSI) of
pressure is needed from the water supply.
Be sure to check the water pressure. If the water
pressure is low, the water heater cannot perform
to its full capability, and may become a source of
trouble for the client.
Drain piping
•Expansion water may drop from the pressure
prevention device and wet the floor. If neces-
sary, provide drain piping or use a drain hose to
remove the water.
Hot water piping
•Do not use lead, PVC, iron or any piping which
has been treated with chromates, boiler seal or
other chemicals.
•The longer the piping, the greater the heat loss.
Try to make the piping as short as possible.
•Use mixing valves with low water resistance. Use
shower heads with low pressure loss.
•If necessary, use a pump or other means to en-
sure that the supply water pressure to the inlet of
the heater does not fall below 29 PSI when the
maximum amount of water is being demanded.
Also install a pressure meter on the inlet. If this is
not done, local boiling will occur inside the water
heater causing abnormal sounds and decreasing
the durability of the heat exchanger.