Noritz NRCP1112-DV User manual

Installation Manual
CONDENSING TANKLESS GAS WATER HEATER
WARNING
–Donotstoreorusegasolineorotherinammablevaporsandliquidsinthevicinityofthisoranyother
appliance.
– WHAT TO DO IF YOU SMELL GAS
 •Donottrytolightanyappliance.
 •Donottouchanyelectricalswitch;donotuseanyphoneinyourbuilding.
 •Immediatelycallyourgassupplierfromaneighbor’sphone.Followthegassupplier’sinstructions.
 •Ifyoucannotreachyourgassupplier,calltheredepartment.
–Installationandservicemustbeperformedbyaqualiedinstaller,serviceagencyorthegassupplier.
Iftheinformationintheseinstructionsisnotfollowedexactly,areorexplosionmayresult,
causingpropertydamage,personalinjury,ordeath.
ThankyouforpurchasingthisNoritzTanklessGasWaterHeater.
Beforeusing,please:
Readthisguidecompletelyforoperationinstructions.
Completelylloutthewarrantyregistrationcard(includedseparately)andmailthedetachableportiontoNoritz
AmericaCorporation.Keepthisguide(andtheremainderofthewarrantyregistrationcard)where
itcanbefoundwhenevernecessary.
Installationmustconformwithlocalcodes,orintheabsenceoflocalcodes,theNationalFuelGasCode,ANSI
Z223.1/NFPA54.NoritzAmericareservestherighttodiscontinue,orchangeatanytime,thedesignsand/or
specicationsofitsproductswithoutnotice.
NRCP1112-DV / NRCP982-DV (Eco TOUGH)
•NaturalGas(NG) /LiquidPropaneGas(LP)
Models

2
Chapter1 ProductAccessories 1-1 Included Accessories 3
1-2 Optional Accessories 3
Chapter2 ProductSpecications 2-1 Specications 4
2-2 Dimensions & Connections 5
Chapter3 SafetyRequirements 3-1 Safety Precautions 6
3-2 Before Installation 7
3-3 Choosing Installation Site 8
3-4 High Elevation Installations 9
3-5 Installation Clearance 10
Chapter4 Installation 4-1 Securing to the wall 13
4-2 Vent Pipe Installation 14
4-3 Gas Piping 20
4-4 Water Piping 23
4-5 Condensate Piping 25
4-6 Plumbing Application 26
4-7 Electrical Wiring 30
4-8 Setting the Control Panel
(Clock Adjustment & Recirculation Timer Setting) 31
Chapter5 Maintenance 5-1 Maintenance 34
5-2 Final Check List 36
Memo 37

3
1-1. Included Accessories The following accessories are included with the unit. Check for any missing
items before starting installation.
1-2. Optional Accessories The accessories listed below are not included with the unit, but may be
necessary for installation.
Chapter1.–ProductAccessories
Part Shape Q’ty
WaterHeater 1
Anchors/
Wallmounting
bracket/
EmergencyKit
1
each
Part Shape Q’ty
PVCTerminal
VK3-H-PVC 1
VK3-PVC-VAS 1
PVCTerminal
PRC-1 1
SVConversionKit
(#SV-CK-3)
•90Elbow
(WithInletScreen)
1
Neutralizer
(NC-1)
(For1waterheater)
1
Part Shape Q’ty
Owner’sGuide,
WarrantyCard,
InstallationManual,
TechnicalDataSheet,
QuickInstallationGuide,
PartList
1
each
Ventscreenswith
Finishing
(3")
2
Part Shape Q’ty
Horizontal
Hood
Termination
PVT-HL
1
each
Isolation
Valves
(includes
pressure
reliefvalve)
1
each
Ventscreens
withFinishing
(2")
(Aftermarket)
2

4
Chapter2.–ProductSpecications Specications
Model Name NRCP1112-DV NRCP982-DV
Gas Input Rate
MAX 199,000 Btu/h 180,000 Btu/h
MIN 18,000 Btu/h 18,000 Btu/h
High Altitude (2,500~4,500ft) 180,000 Btu/h 180,000 Btu/h
Hot Water Capacity
35°F Rise 11.1 Gal 10.1 Gal
45°F Rise 8.7 Gal 7.8 Gal
77°F Rise 5.1 Gal 4.6 Gal
Installation Indoor Wall Hung
Flue System Sealed Combustion Direct Vent, Single Vent
Max Vent Run 2″(50ft) / 3″(100ft) Schedule 40 PVC, CPVC, PP
Orice Size NG (Gas / Needle) 0.381″(9.7mm) / 0.389″(9.9mm)
LP (Gas / Needle) 0.307″(7.8mm) / 0.315″(8.0mm)
Gas Supply Pressure NG 3.5˝ WC to 10.5˝ WC
LP 8.0˝ WC to 14˝ WC
Manifold Pressure
Gas Type NG LP NG LP
Low Fire 2″ VENT -0.03 WC -0.06 WC -0.03 WC -0.06 WC
3″ VENT -0.03 WC -0.06 WC -0.03 WC -0.06 WC
High Fire 2″ VENT -0.04 WC -0.07 WC -0.04 WC -0.07 WC
3″ VENT -0.04 WC -0.07 WC -0.04 WC -0.07 WC
Power Supply
Main Supply 120V 60Hz
Maximum
Power Consumption 172W(82W+90W_PUMP)
Ignition System Direct Electronic Ignition / Automatic Flame Sensing
Burner System Premixed Metal Fiber Burner
Gas Valve System Air ratio valve
Minimum Flow Activation Flow 0.5 GPM
Internal Pipe Material STS 304, Copper Tubing
Dimensions W17.3″ – H28.7″ – D14.8″
Weight 85 lbs
Water Holding Capacity Under 2 Gallon
Control Panel / Main Controller P-920C / NGTH-9700C
Water Pressure MAX Hot water 150 psi
MIN 15 psi
Materials Casing Cold Rolled Carbon Steel
Heat Exchanger Heat Exchanger : STS 304
Safety Devices
Flame Sensor, Overheat Cut Off Limit Switch ,
Gas Leak Detector sensor, Water Leak Detector Sensor
Exhaust Temperature Sensor,
Water Temperature Sensor
2-1. SpecicationsSpecications may be changed without prior notice.The capacity may differ slightly,
depending on the water pressure, water supply, piping conditions, and water temperature.

5
Dimensions & Connections
Chapter2.–ProductSpecications
Description Size
AExhaust 3"
BAir Intake 3"
CHot Water 3/4"
DCondensate 1/2"
ERecirculation Return 3/4"
FCold Water 3/4"
GGas 3/4"
NO Name of Component
1
Exhaust
2
Igniter
3
Ignition Plug
4
Burner High Limit Switch
5
Primary Heat Exchanger
6
Secondary Heat Exchanger
7
Control Panel
8
Water Mixing Valve
9
Recirculation Pump
10
Hot Water Connection
11
Condensate Trap
12
Recirculation Return Connection with Filter
13
Computer Board
14
Cold Water Connection
15
Cold Water Filter
16
Gas Connection
17
Manual Power Switch
18
Flow Sensor
19
Water Control Valve
20
Air Pressure Switch
21
Flame Sensor
22
Gas Valve
23
AGM (Air Gas Mixer)
24
Fan Motor
25
Internal Air Intake Filter
26
Air Intake
3
4
5
6
7
8
9
10 11
12
13
14
16
15
17
19
18
20
22
21
23
24
25
26
2
1
2-2. Dimensions & Connections
28.7"[730mm] 4.0"[101mm]
11.5"[292mm]
4.6"[117mm]
6.1"[156mm] 5.6"[142mm]
2.4"[60mm]
6.8"[173mm]
2.6"[67mm]
3.2"[81mm]
9.8"[250mm]
13.6"[346mm]

6
Safety Precautions
Chapter3.–SafetyRequirements
WARNING
To avoid product damage, personal injury, or even possible death, carefully read, understand, and
follow all the instructions in the Installation and Owner’s Guide before installation, operation and
service the Water Heater.
Noritz cannot anticipate every circumstance that might involve a potential hazard. Therefore, all
possible incidents are not included in our warnings. Proper installation, operation, and service are
your responsibility.
You must make sure that the operation and settings of the Water Heater are safe for you and for
others.
This manual provides Safety Symbols. When the user fails to adhere to the following requirement, it will cause death, serious damages,
and a great property loss.
Forsafetysymbols,‘DANGER’,‘WARNING’,‘CAUTION’areindicatedandthedenitionsforthesetermsareasfollow:
Indicatesanimminentlyhazardoussituationwhich,ifnotavoided,willresultindeathorserious
injury.Thissignalwordislimitedtothemostextremesituations.
Indicates a potentially hazardous situation which, if not avoided, could result in death or
seriousinjury.
Indicates a potentially hazardous situation which, if not avoided, may result in minor or
moderateinjury.Itisalsousedtoalertagainstunsafepracticesandhazardsinvolvingonly
propertydamage.
3-1. Safety Precautions
DANGER
WARNING
CAUTION

7
DANGER
Before Installation
Chapter3.–SafetyRequirements
Check the xing brackets and vent pipe yearly for damage or wear. Replace if necessary.
3-2. Before Installation
WARNING
PrecautionsonVentPipeReplacement
The vent system will almost certainly need to be replaced when this appliance is being installed.
Only use vent materials that are specied in this Installation Manual for use on this appliance. Refer
to the “Vent Pipe Installation” section for details. If PVC, CPVC, or Category IV listed pipe is already
installed, check for punctures, cracks, or blockages and consult with the vent pipe manufacturer
before reusing.
Improper venting may result in res, property damage or exposure to Carbon Monoxide.
SnowPrecaution
If this product will be installed in an area where snow is known to accumulate, protect the vent
termination from blockage by snow drifts or damage from snow falling off of roofs.
ChecktheGas
Check that the rating plate indicates the correct type of gas.
Check that the gas supply line is sized for 199,000 Btu/h.
CheckthePower
The power supply required is 120VAC, at 60Hz.
Using the incorrect voltage may result in re or electric shock.
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.
CAUTION

8
Choosing Installation Site
Chapter3.–SafetyRequirements
3-3. Choosing Installation Site
Locate the appliance in an area where leakage from the unit or connections will not result in damage to the area
adjacent to the appliance or to the lower oors of the structure. When such locations cannot be avoided, it is
required that a suitable drain pan, adequately drained, be installed under the appliance.
The pan must not restrict combustion air ow.
DANGER
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.
WARNING
Avoid places where res are common, such as those where gasoline,
benzene and adhesives are handled, or places in which corrosive gases
(ammonia, chlorine, sulfur, ethylene compounds, acids) are present. Using
the incorrect voltage may result in re or cracking.
Avoid installation in places where dust or debris will accumulate. Dust may
block the air-supply opening, causing the performance of the device fan to
drop and incomplete combustion to occur as a result.
Avoid installation in places where special chemical agents (e.g., hair spray
or spray detergent) are used. Ignition failures and malfunction may occur as
a result.
Carbon Monoxide Poisoning Hazard. Do not install this water heater in a
mobile home, recreational vehicle or on a boat.
The water heater is designed for indoor installation only. Never install it
outdoors or in a bathroom, it may be damaged or a re may be caused.
Consult with the customer concerning the location of installation.
Install the water heater in an area that allows for the proper clearances to
combustible and noncombustible construction. Consult the rating plate on
the appliance for proper clearances.
Do not install the water heater in a place where it may be threatened by
falling objects, such as under shelves.
The water heater must be installed in a place where supply and exhaust
pipes can be installed as directed.
Do not install the water heater where the exhaust will blow on outer walls or material not resistant to
heat. Also consider the surrounding trees and animals.
The heat and moisture from the water heater may cause discoloration of walls and resinous materials,
or corrosion of aluminum materials.
CAUTION

9
Choosing Installation Site
Chapter3.–SafetyRequirements
3-4. High Elevation Installations
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.
Avoid installation above gas ranges or stoves.
Avoid installation between the kitchen fan and stove. If oily fumes or a large
amount of steam are present in the installation location, take measures to
prevent the fumes and steam from
entering in the equipment.
Install in a location where the exhaust gas ow will not be affected by fans
or range hoods.
Take care that noise and exhaust gas will not affect neighbors. Avoid
installation on common walls as the unit will make some operational noises
while it is running.
Before installing, make sure that the exhaust ue termination will have the
proper clearances according to the National Fuel Gas Code (ANSI Z223.1).
CAUTION
Thisunitisonlyapprovedforinstallationupto4500ft.(1350m)abovesealevel.Forinstallationsat
higherelevations,contactNoritzAmericaforInstructions.

10
Installation Clearances
Chapter3.–SafetyRequirements
CookingEquipment
<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 noncombustible material of
a width greater than the water heater.
Securingofspaceforrepair/inspection
If possible, leave 8" (200mm) or more on either side of the
unit to facilitate inspection.
If possible, leave 24" (600mm) or more in front of the unit to
facilitate maintenance and service if necessary.
If possible, leave 3" (75mm) or more above and below the
vent pipe to facilitate inspection and repair if necessary
Distancefromcombustibles
Maintain the following clearances from both combustible
and non-combustible materials.
3-5. Installation Clearances
WARNING
Beforeinstalling,checkforthefollowing:
Install in accordance with relevant building and mechanical codes, as well as any local, state or national
regulations, or in the absence of local and state codes, to the National Fuel Gas Code ANSI Z223.1/
NFPA 54 – latest edition. In Canada, see NSCNGPIC for detailed requirements.

11
Installation Clearances
Chapter3.–SafetyRequirements
Description US Direct Vent
Installations 1
Canadian Direct Vent
Installations 2
A Clearance above grade, veranda, porch, deck, or balcony 12 in (30 cm) 12 in (30 cm)
B Clearance to window or door that may be opened 12 in (30 cm) 36 in (91 cm)
C Clearance to permanently closed window * *
DVertical clearance to ventilated soft located above the terminal within
a horizontal distance of 2 feet from the center line of the terminal * *
EClearance to unventilated soft * *
F Clearance to outside corner * *
G Clearance to inside corner * *
HClearance to each side of center line extended above meter/regulator
assembly *
3 ft (91 cm) within a
height 15 ft above the
meter/regulator assembly
I Clearance to service regulator vent outlet * 3 ft (91 cm)
JClearance to non-mechanical air supply inlet to building or the combus-
tion air inlet to any other appliance 12 in (30 cm) 36 in (91 cm)
K Clearance to a mechanical air supply inlet
3 ft (91 cm) above if
within 10 ft (3 m) hori-
zontally
6 ft (1.83 m)
LClearance above paved sidewalk or paved driveway located on public
property * 7 ft (2.13 m)
†
M Clearance under veranda, porch, deck, or balcony * 12 in (30 cm) ‡
Clearance Requirements from Vent Terminations to Building Openings
<When supplying combustion air from the outdoors (Direct Vent)>
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 oor.
* Clearance in accordance with local installation codes and the requirements of the gas supplier. Clearance to opposite wall is 24 inches (60 cm).

12
Installation Clearances
Chapter3.–SafetyRequirements
Description US Non-Direct 1Canadian Non-Direct 2
A Clearance above grade, veranda, porch, deck, or balcony 12 in (30 cm) 12 in (30 cm)
B Clearance to window or door that may be opened
48 in (120 cm) below or to
side of opening; 12 in (30
cm) above opening
36 in (91 cm)
C Clearance to permanently closed window * *
DVertical clearance to ventilated soft located above the terminal within
a horizontal distance of 2 feet from the center line of the terminal * *
EClearance to unventilated soft * *
F Clearance to outside corner * *
G Clearance to inside corner * *
HClearance to each side of center linvvve extended above meter/regula-
tor assembly *
36 in (91 cm) within a height
15 ft (4.57 m) above the
meter/ regulator assembly
I Clearance to service regulator vent outlet * 36 in (91 cm)
JClearance to non-mechanical air supply inlet to building or the combus-
tion air inlet to any other appliance
48 in (120 cm) below or to
side of opening; 12 in (30
cm) above opening
36 in (91 cm)
K Clearance to a mechanical air supply inlet 36 in (91 cm) above if with-
in 10 ft (3 m) horizontally 6 ft (1.83 m)
LClearance above paved sidewalk or paved driveway located on public
property * 7 ft (2.13 m)
†
M Clearance under veranda, porch, deck, or balcony * 12 in (30 cm)
‡
Clearance Requirements from Vent Terminations to Building Openings
<When supplying combustion air from the indoors (Non-Direct Vent)>
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 oor.
* Clearance in accordance with local installation codes and the requirements of the gas supplier. Clearance to opposite wall is 24 inches (60 cm).

13
Method of positioning the water heater on a wall
• Drill in the supplied anchor screws after considering where the vent termination will be located.
• After four anchor screws are inserted in the holes, mount the wall bracket.
• Afx the wall bracket securely to the wall.
• Make sure that it is leveled, and it can support the weight of the water heater.
• Lift up the water heater, rest the unit on the hooks provided on the wall bracket on the wall.
Securing to the wall
Chapter4.–Installation
4-1. Securing to the wall
WARNING
CLEARANCESFORSERVICEACCESS
The water heater must be installed on a wall that can bear its weight.
If you try to install the heater on a wall which cannot support its weight, please reconsider.
The Water heater can be installed on any suitable internal wall (suitable sound proong may be required
when installing onto a stud partition wall).

14
Chapter4.–Installation
GeneralRequirements
• 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, schedule 40 CPVC must be used.
• 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.
• Do not common vent or connect more than one appliance to this venting system.
• The total vent length including horizontal & vertical vent runs should be no less than 3' (0.9m).
• Do not store hazardous or ammable substances near the vent termination and check that the termination is not blocked in any way.
VentingWithPVCorCPVC
This appliance can be vented with non cellular core plastic pipe materials as specied in the below table.
Vent installations in Canada which utilize plastic vent systems must comply with ULC S636.
Item Material United States Canada
Exhaust Vent /Air Intake
Schedule 40 PVC ANSI/ASTM D1785
ULC S636 Certied
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
• Use only solid PVC or CPVC schedule 40 pipe. Cellular foam core piping is not allowed.
• In Canada, plastic vent systems must be certied to ULC S636. The components of the certied vent system must not be interchanged
with other vent systems or unlisted pipe/ttings.
• In Canada, specied primers and glues of the ULC S636 certied vent system must be from a single system manufacturer and not
intermixed with other system manufacturer’s vent system parts.
• PVC or CPVC pipe has been approved for use on this appliance with zero clearance to combustibles.
• Follow all general venting guidelines as outlined on this page.
• The pipe shall be installed so that the rst 3' (0.9m) of pipe from the appliance ue 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:
* Squarely cut all pieces of pipe.
* Remove all burrs and debris from joints and ttings.
* 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 3' (0.9m) intervals. Do not use the water heater to support
the vent piping.
• A bird screen must be installed on the vent terminations to prevent debris or animals from entering the piping.
Vent Pipe Installation
4-2. Vent Pipe Installation (IndoorInstallationOnly)

15
3 inch pipe 2 inch pipe (Use the pvc reducer bushing purchased as an after market.)
Chapter4.–Installation Vent Pipe Installation
Tightening
• You can select the size of vent pipe(2" or 3") according to the installation conditions.
• Push the pipe into the unit ue until it touches the bottom.
• Tighten the band clamps using a screwdriver.
• Finally, make sure that both pipes(exhaust & air intake) are securely xed.
VentTermination
Vent Screen Installation
• Install vent screen (Only 3" vent screens are included as accessories), see the below 󰘰gure for appropriate
con󰘰guration.
• After connecting vent/air inlet terminal, it is required to install screen for the terminal to prevent incoming
of debris and animals, which might cause damage to the unit.
(2" vent screen (1/4" mesh) must be purchased for 2" venting installation)
AllowableSchedule40VentLengths(PVC,CPVC,PP)
* The termination elbow must be included in the total number of elbows.
Maximum Vent Length
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.
3" vent screen (1/4" mesh)
Pipediameter 3"(75mm) 2"(50mm)
NoofElbows Max.straightVentLength*
6 70
´
N/A
5 75
´
N/A
4 80
´
18
´
3 85
´
26
´
2 90
´
34
´
1 95
´
42
´
0 100
´
50
´
Reducerbushing
• 5 feet (1.5M) for each additional
3-inch 90-degree elbow
• 2.5 feet (0.75M) for each additional
3-inch 45-degree elbow
• 8 feet (2.4M) for each additional
2-inch 90-degree elbow
• 4 feet (1.2M) for each additional
2-inch 45-degree elbow

16
Vent Pipe Installation
Chapter4.–Installation
HorizontalVentTermination-PVC/CPVCMaterialsOnly
• As illustrated on the right, 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) remote distance between Intake and Exhaust cannot
be ensured, the installation can be carried out only in the installa-
tion method shown in page 18.
• The PVT-HL termination may be used in place of elbows as the
horizontal vent terminations. It is not necessary to use bird screens
with the PVT-HL termination.
• Terminate at least 12" (300mm) above grade or above snow line.
• 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.
• Terminate at least 3' (0.9m) above any forced air inlet within 10'
(3m) , 1' (0.3m) below, 1' (0.3m) horizontally from or 1' (0.3m)
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" upwards for every 12" (300mm)
toward the termination.
• Use a condensation drain if necessary.
• In the Commonwealth of Massachusetts a carbon monoxide de-
tector is required for all side wall horizontally vented gas fuel equip-
ment. Please refer to Technical Bulletin TB 010606 for full installa-
tion instructions.
VerticalVentTermination-PVC/CPVCMaterialsOnly
• As illustrated on the right, make sure to keep a distance of 3'
(0.9m) or wider between the intake and exhaust
when installing the vent piping.
• Terminate at least 6' (1.8m) from the combustion air intake of any
appliance, and 3' (0.9m) from any other
building opening, gas utility meter, service regulator etc.
• Enclose exterior vent systems below the roof line to limit conden-
sation and protect against mechanical failure.
• When the vent penetrates a oor or ceiling and is not running in a
re rated shaft, a restop 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.
• 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 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.
Exhaust
Intake
Slope vent
Upwards
**1' (0.3m) Minimum
* Not supplied with water
heater, order separately
**1' (0.3m) Minimum
recommended, but not required.
Hanger
Straps
3" Min
Insert Bird Screen*
in End of 90 Elbow
Exhaust
Intake
Slope vent
Upwards
**1' (0.3m) Minimum
* Not supplied with water
heater, order separately.
**1' (0.3m) Minimum
recommended, but not required.
Hanger
Strap
Firestop
Support
Firestop/Support
Storm
Collar
Roof
Flashing
Insert Bird
Screen* in
End of 90 Elbow
Firestop
Roof
Flashing
Storm
Collar
12" over maximum
snow level
or 24", whichever
is greater.
3ft. Min.
12" over maximum
snow level or 24",
whichever is
greater.
Vent Pipe Installation (DV-Direct Vent)

17
Vent Pipe Installation
Chapter4.–Installation
ConcentricPVC/CPVCTermination
• The concentric termination may be shortened, but not lengthened from its original factory supplied length.
• 2" (50mm) & 3" (75mm) PVC or CPVC pipe may be used with the concentric termination. Reducers will be needed to connect 2" pipe.
Maintain the same vent pipe diameter from the water heater ue to the termination.
• Do not exceed the maximum vent lengths as specied in this section.
• There must be a 1" (25mm) to 4" (100mm) clearance between the outside wall and the air intake section of the termination as
illustrated on the left.
• Install a securing strap to prevent movement of the termination.
• Terminate at least 12" (300mm) above grade or above snow line.
• 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.
• Terminate at least 3' (0.9m) above any forced air inlet within 10' (3m), 1' (0.3m) below, 1' (0.3m) horizontally from or 1' (0.3m) 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” upwards for every 12" (300mm).
• Use a condensation drain if necessary.
Slope vent
Upwards
Hanger
Straps
Strap
1" (25mm) to
4" (100mm)
Insert Bird Screen***
in End of Termination
*** Not supplied with
water heater,
order separately.
Exhaust
Intake
Intake
Exhaust
US 12 in (30cm)
* Not supplied with water
heater, order separately.
PVC Concentric
Vertical Adapter Set
(#VK-PVC-VAS)
Vent Pipe Installation (DV-Direct Vent)
Vertical
Horizontal

18
Vent Pipe Installation
Chapter4.–Installation
• Intake and exhaust should face the same direc-
tion. Intake and exhaust should stay within the
same pressure zone.
• 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.
• 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.
• Intake and exhaust should face the same direc-
tion. Intake and exhaust should stay within the
same pressure zone.
• Insert the bird screen. 90° elbow vertical setting
(downward).
• Ensure at least 3ft (0.9m) or more distance
between edge of air intake pipe or exhaust pipe
and corner wall.
• 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 dis-
tance is measured at the outlets of intake port
(terminal) and exhaust port (terminal).
• Intake and exhaust should face the same direc-
tion. Intake and exhaust should stay within the
same pressure zone.
• Insert the bird screen. 90° elbow vertical setting
(downward).
• Ensure at least 3ft (0.9m) or more distance
between edge of air intake pipe or exhaust pipe
and corner wall.
• The pipe farther from the wall is intake, the side
near the wall is exhaust. The reverse connection
is not allowed.
• Ensure at least 1ft (0.3m) or more distance
between intake pipe and exhaust pipe. The
distance is measured at inside of pipe to inner
dimension.
HorizontalVentTermination-PVC/CPVCMaterialsOnly
* When 3' (0.9m) remote distance between Intake and Exhaust cannot be ensured.
* Can not use Hood termination (PVT-HL)
5.9"
Interior View
ExhaustIntake
Exterior View
3" Min
2ft. Min
Interior View
Exhaust
Intake
Exterior View
5.9"
1ft. Min
Intake
Exhaust
1ft. Min
3" Min
Interior View
ExhaustIntake
Exterior View
5.9"
Exhaust Intake
1ft. Min.
3" Min
Vent Pipe Installation (DV-Direct Vent)

19
Vent Pipe Installation
Chapter4.–Installation
HorizontalVentTermination-PVC/CPVCMaterialsOnly
• 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.
• 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.
• Terminate at least 3' (0.9m) above any forced air inlet within
10' (3m) , 4' (1.2m) below, 4' (1.2m) horizontallyfrom or 1' (0.3m)
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" 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.
VerticalVentTermination-PVC/CPVCMaterialsOnly
• Terminate at least 6' (1.8m) from the combustion air intake of
any appliance, and 3' (0.9m) from any other building opening, gas
utility meter, service regulator etc.
• Enclose exterior vent systems below the roof line to limit
condensation and protect against mechanical failure.
• When the vent penetrates a oor or ceiling and is not running in
a re rated shaft, a restop 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.
• 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.
Provideadequatecombustionairsoastonotcreate
negativepressurewithinthebuilding.
• 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 24"
(600mm) 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.
*When supplying combustion air from the indoors (SV-CK-3 Conversion Kit is required)
Exhaust
Intake
Inlet screen
90 Elbow
SV Conversion Kit
Accessory
(#SV-CK-3)
Slope vent Upwards
**1' (0.3m) Minimum
* Not supplied with water
heater, order separately
**1' (0.3m) Minimum
recommended, but not required.
Hanger
Straps
Insert Bird
Screen* in
Each End
of Tee
3" Min
Exhaust
Intake Inlet screen
90 Elbow
SV Conversion Kit Accessory
(#SV-CK-3)
Slope vent Upwards
**1' (0.3m) Minimum
* Not supplied with water
heater, order separately
**1' (0.3m) Minimum
recommended, but not required.
Hanger
Strap
Firestop
Support
Firestop/Support
Storm
Collar
Roof
Flashing
Insert Bird
Screen* in
End of 90 Elbow
10" (250mm)
20" (500mm)
Openings supplying indoor air
10" (250mm)
20" (500mm)
Vent Pipe Installation (SV-Non Direct Vent)

20
Gas Piping
Chapter4.–Installation
4-3. Gas Piping In order to choose the proper size for the gas line, consult local codes or the National Fuel Gas
Code ANSI Z223.1.
The guidelines and examples we have provided in this manual section are for reference only.
The sizing and installation of the gas system for this water heater, as with any gas appliance, is the sole responsibility of the
installer. The installer must be professionally trained to do such work and must always follow all local and national codes
and regulations. Gas line sizing calculations must be performed for every installation. Please contact Noritz America at
866-766-7489 if you have any questions or concerns.
Regulators
Ensure that all gas regulators used are operating properly and providing gas pressures within the specied range of the
water heater being installed. Excess gas inlet pressure may cause serious accidents.
Pressure
Check the gas supply pressure immediately upstream at a location provided by the gas company. Supplied gas pressure
must be within the limits shown in the specications section with all gas appliances operating. The inlet gas pressure must
be within the range specied. This is for the purposes of input adjustment. Low gas pressure may cause a loss of ame or
ignition failure at other appliances in the home, which may result in unburned gas in the home. Serious accidents such as
re or explosion may result.
MeasuringGasPressure
In order to check the gas supply pressure to the unit, a tap is provided on the
gas inlet. Remove the round head philips screw from the tap, and connect a
manometer using a silicon tube.
In order to check the gas manifold pressure, a tap is provided on the gas valve
inside the unit. The pressure can be checked either by removing the screw and
connecting the appropriate pressure gauge.
GasType
The gas type indicated on the water heater rating plate (NG or LP) must match the type of gas being supplied to the water
heater.
GasConversions
If the gas type supplied does not match the gas type on the rating plate, contact your water heater supplier for a replacement
unit with the proper gas type. If a gas type conversion must be made, there are conversion kits available for some models.
[The conversion kit shall be installed by a qualied service agency in accordance with the manufacturer’s instructions and
all applicable codes and requirements of the authority having jurisdiction. The qualied service agency is responsible for
the proper installation of this kit. Improper installation of this kit will void the warranty. Conversion kits will only be shipped
directly to the Distributor or Agency performing the conversion.]
Meter
The gas meter must be sized properly for the water heater and other gas appliances to operate properly.
Select a gas meter capable of supplying the entire btuh demand of all gas appliances in the building.
CAUTION
CAUTION
CAUTION