Noritz NRC111-SV, NCC199-SV, N-0842MC Installation Manual

Installation Manual

NORITZ AMERICA
CORPORATION

Canada

CONDENSING TANKLESS GAS WATER HEATER

NRC111-SV (Indoor/Outdoor Installation)

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.

DANGER indicates an imminently hazardous situation which,

DANGER

WARNING

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

WARNING: If the information in this manual is not followed exactly, a fire or explosion may result

causing property damage, personal injury or death.

Prohibited

CAUTION indicates a potentially hazardous situation which,
if not avoided, may result in minor or moderate injury.

Disconnect
Power

Ground

Be sure to do

CAUTION

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.

CERTIFIED

KS-09-0011

Rev. 10/09

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 Pro­pane Installation Code (NSCNGPIC).

Noritz America reserves the right to discontinue, or change at
any time, the designs and/or specifications of its products with­out notice.

1.

Included Accessories

The following accessories are included with the unit.
Check for any missing items before starting installation.

Part Shape Q’ty

Tapping Screw

Remote Controller

(See p. 24)

Power Cord

2.

Optional Accessories

5

1

1

Owner's Guide, Warranty,

Installation Manual

(this document)

Remote Controller

Cord (3m(10'))

The accessories listed below are not
included with the units, but may be necessary
for installation.

Q’tyShapePart

1

each

1

Q’tyShapePartPart Shape Q’ty

Outdoor Vent Cap

(VC4C)

Isolation Valves

(includes pressure

relief valve)

Remote Controller

Outdoor

Junction Box

Pipe Cover

(PC-3S)

1

1

1

1

Quick Connect Cord

Remote Controller

Cord (8m(26'))

Bird Screen for

100mm (4") PVC

VT4-PVCS

Bird Screen for

75mm (3") PVC

VT3-PVCS

1

1

1

1

2

3.

Quick Connect Multi System Installation

• The Quick Connect Multi System allows the installation of two units together utilizing only the Quick
Connect Cord.

The Quick Connect Cord is 2m (6'). long. Install the units 50 - 457mm (2-18") 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).

System Diagram

* When connecting two units, use only

Quick Connect
Cord

Cord
Connector

Cord
Connector

Terminal Block

Remote Controller

a single remote controller.

Note: Connect the remote

controller to only one
of the units.

Typical Plumbing

Make this distance as short
as possible.
* The hot water temperature
will become unstable as the
pipe length increases.

Union

Quick Connect

Cord

Shutoff

Valve

Remote Controller Cord

G

Distance at center:

515 - 922mm (20.3 - 36.3").

Distance on sides

50 - 457mm (2 - 18").

Union

Union

Gas Valve

Shutoff Valve

Gas Supply Piping

Cold Water Supply

Hot Water

Shutoff

Valve

Hot Water
Cold Water

• 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.

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.

3

Before Installation

4.

DANGER

Checkup

• Check the fixing brackets and vent pipe yearly for damage or wear. Replace if necessary.

WARNING

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.

NRC111-SV

10.3a-2007

199,900 BTU

11,000 BTU

4.3a-2007

199,900

222

4.0

0.85 3.05

15

840

10.5

150

4

192,700

CAUTION

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.

4

Choosing Installation Site

5.

* 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.

DANGER

• 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.

WARNING

• 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.

Prohibited

• 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.

5

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 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).

• Make sure that the location allows installation of the exhaust
vent as specified.

• For outdoor installation, use the outdoor vent cap.
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.

Prohibited

Prohibited

[For outdoor installation only]

• 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 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.

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.

Be sure to do

6

6. 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.

Item

• Maintain the following clearance from
both combustible and non-combustible
materials.

From Heater

Required Clearances

• 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

Cooking Equipment

water heater.

Check Illustration

Exhaust hood

Dividing plate

Range

300mm (12") or more
(Indoor)
900mm (36") or more
(Outdoor)

100mm (4") or more
(Indoor)
600mm (24") or more
(Outdoor)

50mm (2") or more

Indoor/

(

Outdoor)

Water
heater

• 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 inspec­tion and repair if necessary.

repair/inspection

Securing of space for

200mm
(8") or
more

600mm
(24") or
more

75mm (3") or more

75mm (3") or more

200mm
(8") or
more

7

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.

A=

B=

C=

D=

E=

F=

G=
H=

I=

J=

K=

L=

M=

Clearance

Above grade, veranda, porch, deck,
or balcony

Window or door that may be opened

Permanently closed window
Vertical clearance to ventilated soffit

located above the terminal within a
horizontal distance of 0.6m
the center of the terminal

Unventilated soffit
Outside corner
Inside corner
Each side of center line extended

above meter/regulator assembly
Service regulator vent outlet
Nonmechanical air supply inlet or

combustion air inlet to any other
appliance

Mechanical air supply inlet

Above paved sidewalk or paved
driveway located on public property

Under veranda, porch, deck, or
balcony

(2')

from

Vent Terminal

Air Supply Inlet

Indoor Installation

(See p.9)

1.2m (4') below or to the side of
opening, or 0.3m (1') above

opening [900mm (36")]

*

*

*
*
*

0.9m (3') within a height 4.5m (15')

above meter/regulator assembly

0.9m (3')

1.2m (4') below or to the side of
opening, or 0.3m (1') above

opening [900mm (36")]

0.9m (3') above if within
3m (10') [1.8m (6')]

[2.1m *** (7' ***)]

*[300mm (12") - Canada Only****] *[300mm (12") - Canada Only****]

Outdoor Installation

300mm (12") [300mm (12")]300mm (12") [300mm (12")]

300mm (12") [900mm (36")]

0.9m (3') within a height 4.5m (15')
above meter/regulator assembly

300mm (12") [900mm (36")]

0.9m (3') above if within
3m (10') [1.8m (6')]

Area Where Terminal
is Not Permitted

(See p.9)

*

*

*
*
*

0.9m (3')

[2.1m *** (7' ***)]

[ ]= 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.

8

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.

Maintain the following clearances to any

opening in any building:

• 1.2m (4') below, 1.2m (4') 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').

stalled Indoors

Vent Clearances When Heater is In-

• 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').

Illustration

1.2m (4')

1.2m (4')

0.3m (1')

0.9m (3')

0.3m (1')

0.3m (1')

0.3m (1')

0.9m (3')

Outdoors With a Vent Cap

(Noritz vent cap)

Vent Clearances When Heater is Installed

*

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.

9

7. Installation

Securing to the wall

• The weight of the device will be applied to the wall. If the strength of the wall is not suffi­cient, 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 sure to do

be damaged and may become highly dangerous.

• Install the unit on a vertical wall and ensure that it is level.

Item

• 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.

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.

Locating Screw Holes

3. Determine the positions for the remaining four screws
(two for the top bracket and two for the bottom), and
remove the unit.

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.

Check

CAUTION

Illustration

Location of Screw Hole

Mounting Bracket
(upper)

Locating Screw Holes

Tapping Screw

6. Take waterproofing measures so that water does

not enter the building from screws mounting the

Mounting

device.

• Make sure the unit is installed securely so that it will

not fall or move due to vibrations or earthquakes.

Structure

• If this water heater is being installed at an elevation of

610m (2,000') or higher, disconnect the connector la­beled "High Elevation Disconnect" as illustrated on the
right. This connector is located inside the unit.

• 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

Above 610m (2,000').

Installations at Elevations

system.

10

DISCONNECT

HIGH ELEVATION

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.

Prior to initial start up, make sure that you fill the neutralizer unit with water.

DANGER

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.)

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.

17 oz.
500ml

11

Vent Pipe Installation

8.

Be sure to do

(Indoor Installation Only)

WARNING

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.

General Requirements

• This appliance may be vented with either PVC
or CPVC schedule 40 pipe.
Refer to page 13 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 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 sub­stances near the vent termination and check
that the termination is not blocked in any way.

• Steam or condensed water may come out
from the vent termination. Select the location
for the termination so as to prevent injury or
property damage.

• If snow is expected to accumulate, take care
the end of the pipe is not covered with snow or
hit by falling lumps of snow.

Maximum Vent Lengths

• This appliance has been designed to be vented
with 100mm (4") PVC or CPVC pipe. Do not
exceed the following maximum vent lengths:

Pipe diameter 100mm (4")

No. of Elbows

3 4.6m (15')
2 8.2m (27')
1 12.0m (39')

* Not including the termination.

• Maintain the same vent pipe diameter from the
heater flue to the vent termination.

• If 75mm (3") PVC or CPVC vent pipe is required,
refer to pages 13 - 14 for instructions.

Clearances

PVC or CPVC has been approved for use on this
appliance with zero clearance to combustibles.

Max. Straight Vent Length*

12

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.

Item Material United States Canada

Schedule 40 PVC ANSI/ASTM D1785

Exhaust Ven t

Pipe Cement/Primer

PVC/CPVC Installation Instructions

• Use only solid PVC or CPVC schedule 40 pipe. Cellular foam core piping is not allowed.
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.

• •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.

• PVC or CPVC pipe has been approved for use on this appliance with zero clearance to combustibles.

• 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.

PVC-DWV ANSI/ASTM D2665

Schedule 40 CPVC ANSI/ASTM F441

PVC ANSI/ASTM D2564

CPVC ANSI/ASTM F493

Note: Do Not Use Cellular Foam Core Pipe

ULC S636 Certified

Materials Only

WARNING

CARBON MONOXIDE POISONING
Failure to properly seal the vent system could
cause flue products to enter the living space.

• 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.

•

When attaching the piping to the water heater, a 100mm (4") PVC or CPVC coupling or elbow must be
used to start the vent run. When venting with 75mm (3") PVC or CPVC, a 100mm (4") x 75mm (3")
coupling must be used to start the vent run. It is not necessary to use cement or silicone when attaching
the coupling or elbow to the water heater.

•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).

13

Horizontal Vent Termination- PVC/CPVC Materials Only

•

Hanger

PVC/CPVC

Coupling

Straps

Slope vent

Upwards

**0.3m (1') Minimum

* Not supplied with water
heater, order separately.

**0.3m (1') minimum

recommended, but not required.

Insert Bird
Screen* in
Each End
of Tee

•

•

• Slope the horizontal vent 1/4" upwards for

• Use a condensation drain if necessary.

Pipe Material PVC or CPVC

Max. Straight Vent Length

No. of Elbows

3 4.6m (15') 0.9m (3')
2 8.2m (27') 3m (10')
1 12.0m (39')

*** Not including the termination.

100mm (4") Pipe

***

75mm (3") Pipe

5.1m (17')

• In the Commonwealth of Massachusetts a

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') 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.

every 300mm (12") toward the termination.

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.

Vertical Vent Termination- PVC/CPVC Materials Only

Insert Bird
Screen* in
End of 45
Elbow

Roof

Flashing

Firestop/Support

**0.3m (1')
Minimum

Storm
Collar

Support

Hanger

Strap

Slope vent
Upwards

PVC/CPVC

Coupling

* Not supplied with water
heater, order separately.

**0.3m (1') minimum

recommended, but not required.

Firestop

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.

14

Combustion Air

Supply combustion air to the units as per the National Fuel Gas Code, ANSI Z223.1 and
in Canada, in accordance with NSCNGPIC.

• 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.

250mm (10")

500mm (20")

500mm (20")

250mm (10")

Openings supplying indoor air

15

Gas Piping

9.

Follow the instructions from the gas supplier.

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 1⁄2 psig (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.

Gas Pressure

Size the gas line according to total btuh demand
of the building and length from the meter or

Gas Meter

Select a gas meter capable of supplying the entire
btuh demand of all gas appliances in the building.

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

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.

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.

Sample Gas Line

Noritz Condensing Tankless Gas Water Heater

(199,900 Btuh)

Outlet E

Section 4

1.5m (5') 1.5m (5')

3m (10')

Natural Gas

Meter

Clothes Dryer

3m (10')

Section 3 Section 2

Outlet D

Gas Fireplace
(25,000 Btuh)

**See next page for the pipe capacity charts.

(35,000 Btuh)

Outlet C

1.5m (5')

1.5m (5')

16

1.5m (5')

Outlet A

Section 1

3m (10')

Outlet B

Barbecue

(50,000 Btuh)

3m (10')

1.5m (5')

Gas Range Stove

(65,000 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 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"

Natur

Liquified P

Gas Line Sizing for a Noritz Condensing Tankless Gas Water Heater

Adapted from UPC 1997

Maximum Natur

Pipe
Size

1/2"
3/4"

1"
1 1/4"
1 1/2"

2"
2 1/2"

3"

3 1/2"

4"

al Gas Delivery Capacity in Cubic Feet per Hour (0.60 Specific Gravity, 0.5" WC Pressure Drop)

3m (10')

4050

6455
11,412
16,709
23,277

Contact the Gas Supplier for Btu/Cubic Ft. of the Supplied Gas. 1000 BTU/Cubic Ft. is a Typical Value

174
363

684
1404
2103

6m (20') 9m (30')

119
249
470

965
1445
2784
4437
7843

11,484
15,998

96
200
377

775
1161
2235
3563

6299
9222

12,847

12m (40') 15m (50') 18m (60') 21m (70') 24m (80') 27m (90')

82
171
323
663

993
1913
3049
5391
7893

10,995

Length in Feet

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

404

605
1165
1857
3284
4808
6698

37.5m (125')

1033
1646
2910
4261
5936

30m (100')

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

358
536

Maximum Liquified P

Maximum Capacity of Flex TracPipe in Cubic Feet per Hour of Natural Gas

Maximum Capacity of Flex TracPipe in Thousands of Btuh Liquified Petroleum

etroleum (Undiluted) Delivery Capacity in Thousands of Btuh (0.5" WC Pressure Drop)

Pipe

3m (10')

275
567

1071
2205
3307
6221

3m (10')

206

383

614

1261
2934

3m (10')

325

605

971

1993
4638

6m (20') 9m (30')

189
393

732
1496
2299
4331

6m (20') 9m (30')

147
269
418
888

2078

6m (20') 9m (30')

232
425
661

1404
3285

Size

1/2"
3/4"

1"
1 1/4"
1 1/2"

2"

** For reference only. Please consult gas pipe manufacturer for actual pipe capacities.

Pipe
Size

3/4"

1"
1 1/4"
1 1/2"

2"

Pipe
Size

3/4"

1"
1 1/4"
1 1/2"

2"

** For reference only. Please consult gas pipe manufacturer for actual pipe capacities.
Tr acPipe® is a registered trademark of Omega Flex.

12m (40') 15m (50') 18m (60') 21m (70') 24m (80') 27m (90') 30m (100') 60m (200')

152

129

114

267

315

590
1212
1858

3465

334
723

1698

528

1143
2684

1039
1559
2992

121
218

191
344

237

504

448

913
1417
2646

R

12m (40') 15m (50') 18m (60') 21m (70') 24m (80') 27m (90') 30m (100') 45m (150')

105
188
284
625

1472

R

12m (40') 15m (50') 18m (60') 21m (70') 24m (80') 27m (90') 30m (100') 45m (150')

166
297
449
988

2327

94
168
251
559

1317

149
265
397
884

2082

Length in Feet

103
217
409
834

1275

1181

2394

2205

Length in Feet

86
153
227

509

1203

Length in Feet

136
241
359

805

1902

96
196
378
771

89
185
346

724
1086
2047

80
141
209
471

1114

126
222
330
745

1761

75
132
194
440

1042

118
208
307
696

1647

83
173
322
677

1023
1921

37.5m (125') 45m (150')

78

162

146
275

307

567

630

866

976

1606

1811

(0.60 Specific Gravity, 0.5" WC Pressure Drop)

71
125
181
415
983

112
197
286
656

1554

67
118
171
393
933

106
186
270

621

1475

63

69

132
252
511
787

1496

55
94

137
320
762

( 0.5" WC Pressure Drop)

87
143
217
506

1205

55
112
213
440
675

1260

60m (200')

48

82

116
277
661

60m (200')

76

129
183

438

1045

Maximum Capacity for Gas Flex Connectors in Cubic Feet per Hour of Natural Gas (0.60 Specific Gravity, 0.5" WC Pressure Drop)

Pipe
Size

300mm (12") 600mm (24") 900mm (36") 1200mm (48") 1500mm (60") 1800mm (72")
1/2"
3/4"

1"

1 1/4"

180 150

290
581

1470

Maximum Capacity for Gas Flex Connectors in Thousands of Btuh Liquified Petroleum ( 0.5" WC Pressure Drop)

Pipe

300mm (12") 600mm (24") 900mm (36") 1200mm (48") 1500mm (60") 1800mm (72")

Size

1/2"
3/4"

1"

1 1/4"

** For reference only. Please consult gas pipe manufacturer for actual pipe capacities.

288 240

465
930

2352

Length in Inches

125
255

512

1200

Length in Inches

200
409
825

1920

106
215
442

1130

169
344
708

1808

93
197
397
960

149
315
638

1536

86
173
347
930

137
278
556

1488

17

Installation and service must be performed by a qualified plumber. In the
Commonwealth of Massachusetts, this product must be installed by a licensed

10.

This appliance 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 plumb­ing 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.

Water Piping

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

• 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.

water hammer prevention measure.

Do not cover the water
drain plug with insulation
so that water in the pipe
can be drained.

Insulate the water
supply valve completely.

18

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 neces­sary, 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

• The longer the piping, the greater the heat loss.

• Use mixing valves with low water resistance. Use

• If necessary, use a pump or other means to en-

has been treated with chromates, boiler seal or
other chemicals.

Try to make the piping as short as possible.

shower heads with low pressure loss.

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.

19

Water Treatment

If this water heater will be installed in an application where the supply water is hard, the water must be
treated with either a water softener, which removes the hardness, or by using sequestering agents, such
as the Noritz Scale Shield, that reduce the amount of scale deposits. Refer to the below tables for sug­gested treatment and maintenance measures to be taken based on the water hardness level. Damage to
the water heater as a result of water in excess of 12 gpg (200 mg/L) of hardness is not covered by the
Noritz America Limited Warranty.

Note: When installing a water softener, consult with the manufacturer for proper sizing and installation

guidelines; the below diagram is for reference only. For more information about Scale Shield, contact
Noritz America at 866-766-7489.

Residential Use Treatment Guidelines Commercial Use Treatment Guidelines

Hardness

Type of Water

Soft

Slightly Hard

Moderately

Hard

Hard

Very Hard

Extremely

Hard

* Install Noritz Isolation Valves to allow for flushing.

Level

0-1 gpg

(0-17 mg/L)

1-3 gpg

(17-51 mg/L)

3-7 gpg

(51-120 mg/L)

7-10 gpg

(120-171 mg/L)

10-14 gpg

(171-239 mg/L)

> 14 gpg

(> 239 mg/L)

Treatment

Device

None None

None None

ScaleShield Once a Year Once a Year

ScaleShield

Water

Softener

Water

Softener

Flush

Frequency*

Once a Year

Softener

Required

Softener

Required

Hardness

Type of Water

Soft

Slightly Hard

Moderately

Hard

Hard

Very Hard

Extremely

Hard

*Install Noritz Isolation Valves to allow for flushing.

**Flushing is required if a water softener is not installed.

Level

0-1 gpg

(0-17 mg/L)

1-3 gpg

(17-51 mg/L)

3-7 gpg

(51-120 mg/L)

7-10 gpg

(120-171 mg/L)

10-14 gpg

(171-239 mg/L)

> 14 gpg

(> 239 mg/L)

Treatment

Device

None

None

Water

Softener

Suggested

Water

Softener

Suggested

Water

Softener

Water

Softener

Flush

Frequency*

None

None

Twice a

Softener

Required

Softener

Required

Year

**

**

Pressure

Relief

Valve

Drain

NORITZ

Condensing
Tankless Gas
Water Heater

Shutoff Valve

Hot Water to Fixtures

Water Treatment System

Cold to Water

Heater

Optional Sediment

Filter

Water Treatment Device

Shutoff Valve

City Water Supply

20

11. Condensate Piping

• This water heater is a high efficiency, fully condensing appliance which produces condensate during
operation. The water heater heater incorporates a collection, neutralization, and removal system which
must be properly drained in order to ensure proper operation of this appliance.

• The water heater is supplied with a pre-installed condensate neutralization system. No additional neu­tralizer is required unless local code dictates otherwise.

• In order to drain the condensate, a 1/2" threaded fitting is provided at the base of the water heater. Do
not reduce the size of this fitting or the drain piping to less than 1/2".

• Use plastic pipe, such as PVC, for the drain line. Do not use steel, black iron, or any other material which
can corrode when placed into contact with water.

• Keep the length of the drain pipe as short as possible. Long runs or applications where the nearest drain
is above the water heater will require the use of a condensate pump. Size the pump to allow for a
maximum condensate discharge of 2 GPH from the water heater.

• Horizontal runs must be sloped 1/4" per foot towards the drain or condensate pump.

• The end of the drain pipe must not be submerged in water or blocked in any way.

• Be sure to check that condensate is freely flowing from the drain piping after the system has been
installed. Condensate will begin flowing out of the water heater within 15 minutes after operation has
started.

• Take measures to prevent the condensate drain lines from freezing (insulation, heat tape, electric heat­ers, etc.).

Condensate piping to floor drain

DO NOT FIT
ANY VALVES

Slope pipe downwards
1/4" per foot.

Floor drain

1/2" PVC pipe

The end of the drain pipe
must have an air gap.

KEEP CLEARANCE

Condensate piping with pump

DO NOT FIT
ANY VALVES

1/2" PVC elbow

Slope pipe downwards
1/4" per foot.

The end of the drain pipe
must have an air gap.

1/2" PVC pipe

3/8" ID tubing*

Condensate pump

* Install tubing according to pump
manufacturer's instructions.

21

12. Plumbing Applications

Recirculation System

Hot Water Return

Pump(*1)

Isolation
Kit(*4)

NORITZ
Tankless Gas
Water Heater

Cold Water Supply

Aquastat(*3)

Pump Control Signal(*2)

Relay for Pump
(if larger than 85 Watts)

Hot Water

Fixtures

Expansion Tank
(Install according
to local code)

Gas Supply

Globe
Valve

Optional 30-38L (8-10 Gallon)
Storage Tank
(To alleviate cold water sandwich)

Notes:

1.

Size the pump to provide a maximum of 7.5 L/min.
(2 GPM) through the system at 3m (10 ft) of head
plus piping losses.
Adjust the flow using a globe valve and verify the
flow rate with the maintenance monitors.

2. Pump Control Signal is the preferred method
to control the recirculation pump.

For pumps larger than 85W, a relay connection must
be used. If the Pump Control Signal is not used,
an Aquastat may be used to control the pump.

3. Use an Aquastat if the water heater is not control­ ling the pump.
Set the Aquastat to 5°C (10°F) below the set
output temperature.

4. Noritz recommends the use of an Isolation Kit
with the installation.
These kits include an integrated shut-off and serv­ ice valve with unions and a pressure relief valve.

105

Pump

R

120VCA

B

S

W

Isolation
Kit(*1)

Neutral
Ground
Live

Aquastat Wiring

Use Honeywell Aquastat

(Model L6006A or L6006C)

Combination Potable Water and Space Heating System

Notes:

1. Noritz recommends the use of an Isolation Kit with
the installation.
These kits include an integrated shut-off and serv­ ice valve with unions and a pressure relief valve.

Size the pump to provide a maximum of 11.3 L/min.

2.
(3 GPM) with a head pressure equal to the loss
through the water heater and Air Handler.

3. Check valve required if it is not included with the
pump.

4.

Set the flow switch to deactivate the Air Handler when

the domestic hot water flow reaches 11.3 L/min. (3 GPM).
Adjust as necessary to prevent cycling.

5. If the system requires water for space heating at
a higher temperature than for other uses, means

such as a mixing valve shall be provided to temper
the water for the other uses to help prevent scald

-ing.

6. Expansion tank required if a backflow preventer is
installed.

Backflow Preventer
(optional)

Optional
Expansion Tank(*6)

NORITZ
Tankless Gas
Water Heater

Air Handler

Pump(*2)

Check
Valve(*3)

Gas Supply

Flow Switch(*4)

Cold Water
Supply

22

Hot Water

Mixing Valve(*5)

Fixtures

Consult a qualified electrician

13.

Disconnect Power

This appliance must be electrically grounded in accordance with local codes, or in the absence of local codes,
with the National Electrical Code, ANSI/NFPA 70. In Canada, the latest CSA C22.1 Electrical Code.

Caution: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper
and dangerous operation.

Verify proper operation after servicing.
Field wiring to be performed at time of appliance installation.

Electrical Wiring

Do not connect electrical power to the unit until all electrical wiring has been completed.

for the electrical work.

WARNING

Electrical Shock Hazard
Do not turn power on until electrical wiring is finished. Disconnect power before servicing.

Failure to do so may result in death or serious injury from electrical shock.

• The electrical supply required by the water heater is
120VAC at 60 Hz.
The power consumption may be up to 327W or higher if
using optional accessories.
Use an appropriate circuit.

• Do not disconnect the power supply when not in use. When
the power is off, the freeze prevention in the water heater
will not activate, resulting in possible freezing damage.

Ground

• To prevent electrical shock, provide a ground
with resistance less than 100 . An electrician
should do this work.

•A grounding screw is provided on the back in
the junction box.

Do not connect the ground to the city water
or gas piping. Do not tie the ground to a tele­phone line.

Breaker Installation

• Mount a device which shuts off the electrical
path automatically (leakage breaker) when
electrical leakage is detected.

1.Remove the screw (one) of the junction box and
open the cover of the junction box.

2.Connect the grounding wire to the ground screw in
the cover.

3.Crimp the outdoor power cable to the power cable of
the unit.

Note:

When installing the water heater outdoors, either

use the included power cord with an approved
outdoor outlet or hard wire the appliance.

• Do not let the power cord contact the
gas piping.

Tie the redundant power cord out­side the water heater. Putting the
redundant length of cord inside the
water heater may cause electrical
interference and faulty operation.

Junction Box

Ground

Power Cord

Electrostatic discharge can affect electronic components. Take precautions to prevent electrostatic discharges from
personnel or hand tools during the water heater installation and servicing to protect product’s electronic control.

CAUTION

23

Remote Controller

• Applicable Model
Noritz Condensing Tankless Gas Water Heater

Remote controller

RC-7650M

Note: The remote controller will indicate when the neutralizer unit is in need of replacement by displaying

an error code and by sounding an audible tone.
Therefore, it is suggested that the remote controller always be installed with this water heater in
order to prevent an unexpected disruption of hot water service.

Install the remote controller according to the instructions in the Installation Guide (p. 31).
* The water heater has been factory set to allow a maximum temperature setting of 50°C (122°F).

To access higher temperature settings through the remote controller, follow the below steps.

<When setting the maximum temperature to 55-60°C (130-140°F)>

1. Turn the water heater off by pressing the ON/OFF button on the remote controller.

2. Press and hold the FLOW METER ALARM SET button until a sound is heard (2 sec.) and 50°C

(122°F) appears on the display.

3. Set the upper limit of the hot-water supply temperature to 55°C(130°F) or 60°C (140°F) using the

UP and DOWN setting buttons.

4. To put the water heater back into operation, press the ON/OFF button on the remote controller.

To keep the water heater off, let the unit sit for 30 sec. to return to the original display.

<When setting the maximum temperature to 55-83°C (130-180°F)>

1. Turn the water heater off by pressing the ON/OFF button on the remote

controller.

2. Disconnect electrical power to the water heater.

R

TO
C

NE

RE

N

U

O

RAT

T C
N

PE

E

EM

TM

R T

JUS

ATE

AD

W

3. Remove the front cover of the water heater (4 screws).

4. Connect "WATER TEMPERATURE ADJUSTMENT CONNECTOR" tag

connector to "180°F" tag connector as shown on the right.

5. Replace the front cover of the water heater (4 screws).

6. Reconnect electrical power to the water heater, but do not turn it on.

7. Press and hold the FLOW METER ALARM SET button until a sound is

(the back : 55 C) (the back : 60 C)

(the back : 83 C)

WATER TEMPERATURE
ADJUSTMENT CONNECTOR

heard (2 sec.) and 50°C (122°F) appears on the display.

8. Set the upper limit of the hot-water supply temperature to

55°C (130°F), 60°C, 65°C, 70°C, 75°C (140°F, 149°F, 158°F, 167°F) or 83°C (180°F)
using the UP and DOWN setting buttons.

9. To put the water heater back into operation, press the ON/OFF button on the remote controller.

To keep the water heater off, let the unit sit for 30 sec. to return to the original display.

• The Noritz Condensing Tankless Gas Water Heater can be programmed so that it will default to one of

four temperatures if the remote controller is removed (80°C, 60°C, 55°C, 50°C (176°F, 140°F, 130°F,
122°F)). However, it is suggested that the remote controller always be installed with this water heater in
order to prevent an unexpected disruption of hot water service. To change the default temperature,
connect the temperature selection wire as shown in the above diagram. The default temperature is 50°C
(122°F) when the temperature selection wire is not connected.

• When changing the temperature, make sure to confirm with the customer that the temperature of
the hot water will be very high and that there is a risk of scalding.

• Water temperatures above 52°C (125°F) can cause severe burns or death from scalding.

24

WARNING

Connecting Remote Controller Cord to Unit

• Keep the remote controller cord away from the freeze prevention heaters in the unit.

• Tie the redundant cord outside the water heater. Do not put the extra length inside the equipment.

• The remote controller cord can be extended up to 90m (300') with 18AWG wire.

• Use a Y type terminal with a resin sleeve. (Without the sleeve, the copper wire may corrode and
cause problems).

• Be sure to hand tighten when screwing to the terminal block. Power tools may cause damage to the
terminal block.

Remote controller cord

• For extensions, a 7.8m (26') cord can be purchased (Part # RC-CORD26) or use 18AWG wire.

• Install according to the National Electrical Code and all applicable local codes.

1. Check to make sure that the remote controller cord
has plenty of slack in order to reach the external
connection terminal block.

2. Disconnect electrical power to the water heater.

3. Remove the single screw securing the terminal
block cover and then remove the cover.

4. Pass the remote controller cord through the wiring
throughway and connect the Y terminals at the end
of the remote controller cord to the terminal block.

5. Replace the terminal block cover and install the
screw previously removed in step 3.

6. Reconnect electrical power to the water heater.

External connection
terminal block

Wiring throughway

Remote controller cord

25

Pump Wiring

nect Multi System feature.

Connecting the pump control wire

1. Leave enough slack so that the pump control
wires will stay connected if the unit is removed
from the wall.

2. Remove the front cover of the heater (4 screws).

3. Cut off the connector at the end of the pump
control wires.

4. Wire the pump control wires through the wiring
throughway and connect them to the wiring inside
the pump (this will be the power supply for the pump,
do not also connect 120VAC to the pump).
If a large pump is being used (greater than 85W) use
the voltage from these wires as the signal to close a
normally open relay through which 120VAC will be
supplied directly from a wall circuit to the pump.

5. Replace the front cover.

* This feature is not available when using the Quick Con-

Crimping Terminal

Wiring
Throughway

PUMP

Pump Control
Wire Tag

Supplies Power for
Circulating Pump
(Use a Relay for
Larger Pumps)

Relay connection with larger pumps (>85 W)

1. Locate and prepare the pump control wires as described above.

2. Choose a suitable installation location for the relay where it will be protected from moisture.

3. Connect the pump control wires from the heater to the signal input on the relay.

4. Cut one of the electrical supply leads and wire it across the open terminals of the relay.

5. Secure all connections and replace the front cover of the heater.

120VAC

Connect to Pump Control
Wires in Unit

Circulation Pump

012

4

Relay (ex. Omron G7L2ABUBJCBAC120)

26

Connecting Quick Connect Cord

Caution

The wire coloring on the Quick Connect Cord will
not be the same as the wire coloring of the
connection plug inside the unit.
* The remote controller can be connected to either

unit A or B.

For Quick Connect Multi System Installation
use a Quick Connect Cord (sold separately).

1.Red

2.Black

3.White

4.Green

5.Blue

6.Blue

1.Red

2.Black

3.White

4.Green

5.Blue

6.Blue

1.White

2.Green

3.Red

4.Black

5.Blue

6.Blue

1.Red

2.Black

3.White

4.Green

5.Blue

6.Blue

Quick Connect
Cord

Connecting the Quick Connect Cord to the two
units.

1. Turn off the power.

2. Remove the front cover of the heater (4 screws).

3. Pass the Quick Connect Cord through the wiring
throughway and into the unit.

4. Plug the connector on the Quick Connect Cord to
the receptacle inside the unit.

5. Attach the ground wire of the Quick Connect
Cord to the terminal block fixing plate.
(If the ground wire is not attached, electrical
noise may cause problems).

6. Secure the Quick Connect Cord with a clamp.

7. Replace the front cover.

AB

Connector

Coupling Cord

Wiring Throughway

"Quick Connect Cord" tag

Ground wire
Connector

Clamp

27

Periodically check the following to ensure proper

14.

• The venting system must be examined periodically by a qualified service technician to check for

any leaks or corrosion.

• The burner flame must be checked periodically for a proper blue color and consistency.

• If the flame does not appear normal, the burner may need to be cleaned.

• If the burner needs to be cleaned, it must be performed by a qualified service technician.

• Do not obstruct the flow of combustion and ventilation air.

• The pressure relief valve must be operated once a year to ensure that it is functioning properly

and there is no obstruction. Turn the power off to the unit before opening the relief valve, and
make sure that water draining out of the valve will not cause any damage.

• If the relief valve discharges periodically, it may be due to thermal expansion in a closed water

system. Contact the water supplier or a local plumbing inspector on how to correct this situation.
Do not plug the relief valve.

• See Operation Manual for further maintenance.

Warning:

15.

Maintenance

There is a scald potential if the output temperature is set too high.
Should overheating occur, or the gas supply fail to shut off, turn off the manual gas control valve to the appliance.
Do not use this appliance if any part has been under water. Immediately call a qualified service
technician to inspect the appliance and to replace any part of the control system and any gas control
which has been under water.
Periodically check and clean the filter inside the cold water inlet of the unit.

Trial Operation

operation of the water heater.

The installer should test operate the unit, explain to
the customer how to use the unit, and give the owner
this manual before leaving the installation.

• Preparation ........... (1) Open a hot water fixture to confirm that water is available, and then close

the fixture.

(2) Open the gas supply valve.
(3) Turn on the power supply. Using the remote controller, turn on the Power

On/Off button (the Operation lamp will turn on).

(1) Open a hot water fixture and confirm that the Burner On lamp comes on, and that hot water is

being produced. (If necessary, repeat until the air in the gas piping is bled out).
* White smoke may be noticed from the exhaust vent during cold weather. However, this is not a

malfunction of the unit.

* If an “11” error code appears on the remote controller, turn the unit off and then back on again,

and then open a hot water fixture again.

(2) Change the temperature setting on the remote controller and check that the water temperature changes.

• If the water heater does not operate normally, refer to “Troubleshooting” in the Operation Manual.

* After the trial operation, clean the filter in the cold water inlet.

<If installed with a quick connect multi-system>

• Turn the system power ON with the remote controller.

• Slowly open a hot water fixture and check that the units ignite sequentially. Check to see that the
hot water temperature is the same as the temperature displayed on the remote controller (*1)

* If both units do not ignite, switch which unit will ignite first by pressing the Max. or Min. Mani-fold
Pressure Set Button on the circuit board. (*2)

Unit A Ignites
Unit B Doesn't Ignite

Press Max. or Min. Manifold
Pressure Set Button on Unit B

Unit A Doesn't Ignite
Unit B Ignites

* If an 11 or F11 error code flashes on the remote controller, hit the Power Button on the remote

controller off and on 2 -3 times.

* If (*1) and (*2) cannot be done, the Quick Connect Cord may not be properly connected.

Check that the cord is properly connected.

28

CAUTION

Handling after trial operation

• If the unit will not be used immediately, close off all gas and water shutoff valves, drain all of
the water out of the unit and the plumbing system to prevent the unit and system from freezing,
and bleed the gas out of the gas line.

Freezing is not covered by the warranty.

WARNING

A fire or explosion may result if these instructions are not followed, which may cause lose of
life, personal injury or property damage.

Lighting Instructions

This water heater does not have a pilot. It is equipped with an ignition device that automatically lights
the burner.
Do not try to light the burner by hand.

1. Read the safety information in the installation manual or on the front of the water heater.

2. Turn off all electrical power to the unit.

3. Do not attempt to light the burner by hand.

4. Turn the gas control manual valve (external to the unit) clockwise to the off position.

5. Wait five minutes to clear out any gas. If the smell of gas remains, stop, and follow the instructions
on page 3 of Owner's Guide.

6. Turn the gas control manual valve counterclockwise to the on position.

7. Turn on electric power to the unit.

8. The unit will now operate whenever hot water is called for. If the unit will not operate, follow the
shutdown instructions and call a service technician.

Shutdown Instructions

1. Stop any water demand.

2. Turn off electric power.

3. Turn the gas control manual valve clockwise to the off position.

Should overheating occur, or the gas supply fail to shut off, turn off the manual control valve to the appliance.

29

16.

Dimensions

4- 13mm [ 0.5"]

6-6mm x 10mm [0.24 x 0.4"]OBLONG HOLE

170mm[6.7"]

140mm [5.5"]
100mm [3.9"]

70mm [2.8"]
36mm [1.4"]

665mm [26.2"]

36mm [1.4"]

70mm [2.8"]
100mm [3.9"]
140mm [5.5"]

170mm[6.7"]

10mm [0.4"]

40mm [1.6"]

93 [3.7"]

586mm [23.1"]

10mm [0.4"]

240mm [9.4"]

130mm [5.1"]

FLUE COLLAR

28mm [1.1"]

AIR INLET

WIRING THOROUGHWAY

CONDENSATE DRAIN

450mm [17.7"]

464mm [18.3"]

448mm [17.6"]

130mm [ 5.1"]

615mm [24.2"]

<mm / inch>

LED

AIR INLET

WATER DRAIN VALVE

(WATER FILTER)

WIRING THOROUGHWAY

6-6mm x 10mm [0.24 x 0.4"]OBLONG HOLE

4- 13mm [ 0.5"]

HEIGHT OF EACH FITTING
FROM BOTTOM OF CASE

NRC111-SV

CONDENSATE DRAIN 24mm [0.9"]

HOT WATER OUTLET 44mm [1.7"]

COLD WATER INLET 55mm [2.2"]

GAS INLET 56mm [2.2"]

WATER DRAIN VALVE

HOT WATER OUTLET

WATER DRAIN VALVE

COLD WATER INLET

109mm [4.3"]

155mm [6.1"]

HOT WATER OUTLET (3/4")

CONDENSATE DRAIN (1/2")

WIRING THOROUGHWAY

70mm [2.8"]
98mm [3.9"]

348mm [13.7"]

264mm [10.4"]

255mm [10.0"]

214mm [8.4"]

99mm [3.9"]

60mm [2.4"]

(VIEW FROM TOP)

WIRING THOROUGHWAY

(AC120V)

GAS INLET

WATER DRAIN VALVE

WIRING THOROUGHWAY

(AC120V)

71mm [2.8"]

120mm [4.7"]

155mm [6.1"]

135mm [5.3"]

GAS INLET (3/4")
WIRING THOROUGHWAY

COLD WATER INLET (3/4")

30