Noritz N-0931M-ASME Installation Manual

Installation Manual

NORITZ AMERICA
CORPORATION

Canada

TANKLESS GAS WATER HEATER

N-0931M-ASME (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-07-0005-1

Rev. 04/08

R

Low NOx

Approved by

SCAQMD

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

Tapping Screw

Remote Controller

(See p. 21)

Heat Exchanger

Inspection report

2.

Optional Accessories

System Controller

Q’ty

Owner's Guide, Warranty,

5

1

1

1

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.

Outdoor Vent Cap

(VC4(-1))

Q’tyShapePart

1

each

1

Q’tyShapePartPart Shape Q’ty

1

Isolation Valves

(includes pressure

relief valve)

Remote Controller

Outdoor

Junction Box

Quick Connect Cord

Remote Controller

1

1

Cord (8m(26'))

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 150 - 482mm (6-19") 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

Pressure
Relief
Valve

Shutoff
Valve

Remote Controller Cord

G

Distance at center

618 - 950mm (24.3-37.4")

Distance on sides

150 - 482mm (6-19")

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.

[For indoor installation only]

WARNING

Check the Gas

• Check that the rating plate indicates the
correct type of gas.

• Check that the gas supply line is sized for
250,000 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.

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.

• 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,
also use the base of the vent cap for rain protection.

• 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).

[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.

Prohibited

Prohibited

•

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.

Be sure to do

[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 heaters can be used for domestic hot water or space
heating systems, not in a combination of domestic and space heating.

For Venting Manufacturers Requirements, see websites or phone numbers listed below:
Noritz N-Vent www.noritz.com
Protech FastNSeal & W2 www.protechinfo.com
HeatFab SafTVent www.heat-fab.com
Z-Flex Z-Vent www.z-flex.com
Flex-L StaR-34 1-800-561-1980

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)

150mm (6") 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')

• For outdoor installation, use the outdoor

vent cap.
If it is necessary to vent above the roof line
in an outdoor installation, also use the base
of the vent cap for rain protection.

0.3m (1')

0.3m (1')

0.3m (1')

0.9m (3')

Outdoors With a Vent Cap

Vent Clearances When Heater is Installed

(Noritz vent cap)

*

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.

6. Take waterproofing measures so that water does
not enter the building from screws mounting the

Mounting

device.

Check

CAUTION

Illustration

Location of Screw Hole

Mounting Bracket
(upper)

Locating Screw Holes

Tapping Screw

• 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 discon­necting 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

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.

Vent Piping

• Use only UL listed category III vent materials.

• Follow the vent pipe manufacturer's installation
instructions.

Pipe diameter 100mm (4")

No. of Elbows Max. Straight Vent Length

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

• Make the vertical section of the exhaust vent
as short as possible.

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

Clearances

Manufacturer and Enclosed Unenclosed

Product Hor. Vert. Hor. Vert.

Noritz N-Vent
Protech FasNSeal

Protech FasNSeal W2
HeatFab SafTVent
Z-Flex Z-Vent
Flex-L-StaR-34

250mm (10") (sides)
375mm (15") (top)
150mm (6") (bottom)

200mm (8") (sides)
300mm (12") (top)
100mm (4") (bottom)

150mm

(6")

150mm

(6")

200mm

(8")

200mm

(8")

100mm

(4")

100mm

(4")

100mm

(4")

150mm

(6")

100mm

(4")

100mm

(4")

25mm

(1")

75mm

(3")

75mm

(3")

50mm

(2")

25mm

(1")

25mm

(1")

25mm

(1")

75mm

(3")

75mm

(3")

50mm

(2")

25mm

(1")

25mm

(1")

These clearances are subject to change.
Refer to the UL listing for the proper clearances.

• The first vertical run from the top of the heater
should be no longer than 0.9m (3').

• Make sure vent pipe is gas tight and will not
leak. Use silicon sealant wherever necessary.

• Do not common vent or connect more than
one appliance to this venting system.

The total vent length including horizontal & verti-

•
cal vent runs should be no less than 0.9m (3').

• Do not place any dangerous objects at the end
of the exhaust vent and check that vent pipe is
not blocked in any way.

• Steam (smoke) or water drops may come out
from the end of the exhaust pipe. Select the
location for the end of the vent so that steam is
not visible, and the vent is not wet with drip­ping water.

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

• Consult the vent pipe manufacturer's install­ation instructions for chimney connections.

Appliance Adapters

• Use the following adapters to connect the
unit to the venting system.

Manufacturer and

Product

Part No.

Protech FasNSeal FSAA4
HeatFab SafTVent 9401RYPK
Z-Flex Z-Vent 2SVWA04
Flex-L Star-34 SRASPSA4

11

Horizontal Vent Termination

Hanger

Straps

Elbow

Slope vent

Downwards

**0.3m (1') Min. -

Appliance

Adapter*

0.9m (3') Max.

* Adapter not required when
using Noritz N-Vent.

** 0.3m (1') minimum recommended,
but not required. Avoid installing
elbow directly on flue.

Vertical Vent Termination

Wall

Thimble

Rain

Cap

Termination

• 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.

• Slope the horizontal vent 1/4" downwards
for every 300m (12").

• Use a condensation drain if necessary.

• In the Commonwealth of Massachusetts a
carbon monoxide detector is required for all
side wall horizontally vented gas fuel equip­ment. Please refer to Technical Bulletin TB
010606 for full installation instructions.

Elbow

**0.3m (1') Min. -

0.9m (3') Max.

Storm
Collar

Roof
Jack

Hanger

Strap

Condensation

Drain (Install
According to

Local Codes)

Appliance

Adapter*

* Adapter not required when
using Noritz N-Vent.

** 0.3m (1') minimum recommended,
but not required. Avoid installing
elbow directly on flue.

Flashing

Firestop/

Support

Firestop

Roof

• Terminate at least 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.

• 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.

• Terminate the vent system at least 0.6m (2')
above, but not more than 1.8m (6') above the
roof line, or according to the vent pipe
manufacturer's instructions.

• Terminate the vent system at least 0.6m (2')
above any portion of a building located within
3m (10') horizontally.

• Provide vertical support every 3.6m (12') or as
required by the vent pipe manufacturer's in­structions.

• Slope the horizontal vent 1/4" for every 300m
(12") towards the drain tee.

• Do not vent straight upwards.
Always have a horizontal section of venting.

• Install a condensation drain in the horizontal
section of the venting.

12

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 250 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 90 cubic feet of
fresh air per minute.

375mm (15")

500mm (20")

500mm (20")

375mm (15")

Openings supplying indoor air

13

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

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. 5" WC
Max. 10.5" WC

LP Gas Supply Pressure

Min. 10.5" 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 250,000 btuh.

• Install a gas shutoff valve on the supply line.

• Use only approved gas piping materials.

⁄2

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 Tankless Gas Water Heater

(250,000 Btuh)

Outlet E

3m (10')

Section 4

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

3m (10')

Natural Gas

Meter

Section 3 Section 2

1.5m (5')

Outlet D

Gas Fireplace
(25,000 Btuh)

**See next page for the pipe capacity charts.

Clothes Dryer
(35,000 Btuh)

Outlet C

1.5m (5')

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)

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.

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')), 250,000 Btuh requires 1"
Section 4: 13.5m (45') (Use 15m (50')), 425,000 Btuh requires 1-1/4"

Instructions

Sample Calculation

14

Natural Gas

Liquified Petroleum

Gas Line Sizing for a Noritz Tankless Gas Water Heater

Adapted from UPC 1997

Maximum Natur

Pipe

3m (10')

Size

1/2"

174

3/4"

363

1"

684

1 1/4"

1404
2103

1 1/2"

4050

2"

2 1/2"

6455

3"

11,412
16,709

3 1/2"

4"

23,277

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

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

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

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

30m (100')

404

605
1165
1857
3284
4808
6698

37.5m (125')

358

536
1033
1646
2910
4261
5936

Maximum Liquified P

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

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

Maximum Capacity of Flex TracPipe in Thousands of Btuh Liquified Petroleum

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

Pipe

3m (10')

Size

1/2"

275

3/4"

567

1071

1"

2205

1 1/4"

3307

1 1/2"

2"

6221

Pipe
Size

3m (10')

206

3/4"

1"

383

614

1 1/4"
1 1/2"

1261

2"

2934

Pipe
Size

3m (10')

325

3/4"

1"

605

1 1/4"

971

1 1/2"

1993

2"

4638

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

189

152

393

315
590

732

1212

1496

1858

2299
4331

3465

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

2078

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

1404
3285

147
269
418
888

232
425
661

121
218
334
723

1698

191
344
528

1143

2684

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

94
168
251

559

1317

149
265
397
884

2082

Length in Feet

103
217
409
834

1275

1181
2205

2394

Length in Feet

86
153
227
509

1203

Length in Feet

136
241
359
805

1902

96
196
378
771

80
141
209

471

1114

126
222
330

745

1761

89
185
346

724
1086
2047

75
132
194
440

1042

118
208
307
696

1647

83
173
322
677

1023
1921

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

78
162
307
630
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

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

129

114

267

237

504

448

1039

913

1559

1417

2992

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

63

69

132
252
511
787

112
213
440
675

1260

60m (200')

48

82

116
277

661

60m (200')

76
129
183
438

1045

146
275

567
866

1496

55
94

137
320
762

( 0.5" WC Pressure Drop)

87
143
217
506

1205

55

Maximum Capacity for Gas Flex Connectors in Cubic Feet per Hour of Natural Gas

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

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

(0.60 Specific Gravity, 0.5" WC Pressure Drop)

93
197
397
960

( 0.5" WC Pressure Drop)

149
315
638

1536

86
173
347
930

137
278
556

1488

15

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 250,000 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.

• 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.

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.

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.

16

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.

17

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

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

18

11. Plumbing Applications

Recirculation System

Hot Water Return

Pump

(See notes for Sizing)

Optional 30 - 38L
(8-10 Gal.)
Storage Tank
(To Alleviate Cold
Water Sandwich)

Fixtures

* Size the pump to provide at least 7.6L/min. (2 GPM) through the system at 30kPa (10')
of Head plus piping losses. Check the maintenance monitors on the unit to make sure the
pump is providing that much flow.
** Adjust the flow using a gate valve and verify the flow rate with the maintenance monitors.

Pressure

Relief

Valve

Drain

Cold Water Supply

NORITZ

Tankless

Gas Water Heater

Shutoff Valve

Hot Water

(Relay for

Pump

> 85 W)

(See p. 23)

Check

Valve

Expansion Tank

(Install According

to Local Codes)

Pump Control Signal

(See p. 23)

Check Valve

Aquastat
(Use Aquastat if Unit Isn't

Controlling Pump)

Aquastat Wiring

Use Honeywell Aquastat

(Model L6006A or L6006C)

Pump

120VAC

Neutral

Ground

Live

105

W

R

B

5

Pressure

Relief Valve

Drain

Cold Water Supply

NORITZ

Tankless

Gas Water Heater

Shutoff Valve

Shutoff

Valve

(Relay for

Pump

> 85 W)

(See p. 23)

Hot Water

Heating System

Backflow

Preventer

(Optional)

Pressure

Reducing

(Optional)

Check

Valve

Pump Control signal

Aquastat
(Use Aquastat if

Unit Isn't Controlling

Expansion

(Install According

to Local Codes)

Boiler Drain Valve

Pump)

Tank

Valve

(See p. 23)

Check Valve

Hot Water Return

Pump

(See notes for Sizing)

Air Scoop
(Optional)

Heating
Controls

Temp. &

Press. Gauge

(Optional)

* Size the pump to provide at least 7.6L/min. (2 GPM) through the system at 30kPa (10') of
Head plus piping losses. Check the maintenance monitors on the unit to make sure the
pump is providing that much flow.
** Adjust the flow using a gate valve and verify the flow rate with the maintenance monitors.

Hydronic Heat

Exchanger or
Radiant Heat

For Baseboard
Applications:
Please contact
Noritz for
compatibility.

Piping

NORITZ

Tankless

Gas Water

Heater

Mixing Valve

Cold Water Supply

Tempered Potable Hot Water

Hot Water for Heating

For Space Heating Purposes:

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 scalding.

19

Consult a qualified electrician

12.

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 250W 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.

Junction Box

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.

• 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.

Power Cord

Ground

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.

20

CAUTION

Remote Controller

• Applicable Model
Noritz Tankless Gas Water Heater

Remote controller

RC-7650M

Install the remote controller according to the instructions in the Installation Guide (p. 31).

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

tures if the remote controller is removed (83°C, 60°C, 55°C, 50°C (181°F, 140°F, 131°F, 122°F)).
To change the default temperature, follow the below steps.

* Changing the default temperature setting:

1. Disconnect electrical power to the water heater.

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

3. Connect the temperature selection wire as shown on the under.The default temperature is 50°C

(122°F) when the temperature selection wire is not connected.

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

5. Reconnect electrical power to the water heater,

83 C

60 C

55 C

ADJUSTMENT CONNECTOR

WATER TEMPERATURE

"55 C" tag

(the back : 131 F)

"60 C" tag

(the back : 140 F)

"83 C" tag

(the back : 181 F)

WATER TEMPERATURE
ADJUSTMENT CONNECTOR

WARNING

• 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.

21

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 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

22

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)

23

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

24

Periodically check the following to ensure proper

13.

• 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:

14.

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.

25

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.

26

15.

Dimensions

4- 13mm [ 0.5"]

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

170mm [6.7"]
140mm [5.5"]
100mm [3.9"]

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

36mm [1.4"]

70mm [2.8"]
100mm [3.9"]
140mm [5.5"]
170mm [6.7"]

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

4- 13mm [ 0.5"]

10mm [0.4"]

665mm [26.2"]

10mm [0.4"]

40mm [1.6"]

586mm [23.1"]

240mm [9.4"]

95mm [3.7"]

69mm [2.7"]

FLUE COLLAR

29mm [1.1"]

AIR INLET

WIRING THROUGHWAYS

WATER DRAIN VALVE
(WATER FILTER)

HOT WATER OUTLET

WATER DRAIN VALVE

450mm [17.7"]

468mm [18.4"]

448mm [17.6"]

619mm [24.4"]

100mm [ 4"]

LED

AIR INLET

COLD WATER INLET

GAS INLET

WIRING THROUGHWAY
(120VAC)

175mm [6.9"]

HOT WATER OUTLET (3/4")
WIRING THOROUGHWAYS

(mm [inch] )

HEIGHT OF EACH FITTING
FROM BOTTOM OF CASE

N-0931M-ASME

HOT WATER OUTLET

COLD WATER INLET

GAS INLET 56mm [2.2"]

(VIEW FROM TOP)

366mm [14.4"]

279mm [11"]

195mm [7.7"]

70mm [2.8"]

155mm [6.1"]

135mm [5.3"]

44mm [1.7"]

55mm [2.2"]

65mm [2.6"]
100mm [3.9"]
159mm [6.3"]

WIRING THOROUGHWAY

(120VAC)

GAS INLET (3/4")

COLD WATER INLET (3/4")

73mm [2.9"]

136mm [5.4"]

Install one system controller

16.

Multi-System

A. Installation without a recirculation system

Unit No.6

Hot Water Pipe

(1 1/4"-2")

Unit No.2

(SC-201-6M) for every six units.

System Controller

Unit
No.1

Disconnect this Connector

* Disconnect this
connector
on units 2-6 also

System Select Connector

* Do not connect to

Disconnect for system controller

the connector.

Remote Controller

Gas pipe

G

Cold Water Supply

(1 1/4"-2")

Pipe

• Insulate or apply heating materials to both the cold water supply piping and the hot water piping to
prevent freezing during cold weather and to prevent heat loss through the piping.

27

B-1. Example of Recirculation with a Multi-System

Hot Water

Supply

Circulation Pump 2

(If Necessary)

Circulation Pump 1

System select connector

Connect to the "Recirculation System"

connector.

Remote Controller

Pump Connection Wire (for pumps

> 85 W, use an external relay)

When installing 2 pumps in parallel

* Set dipswitch 3 to "OFF".

(See SC-201-6M Installation Manual

page 13)

Gas Pipe

Hot Water Return Line

*

Size the water supply piping to

allow for maximum flow rates

of the units.

Hot Water

(1 1/4"-2")

Water supply

* Also disconnect this connector on units 2-6

Unit

6

Unit

2

Unit

1

System Controller

This system will make hot water more quickly available to remote fixtures.
The pump will circulate water through the loop until the entire loop is warm, and then the system
controller will turn off the pump until the loop cools down.

.

Disconnect this Connector

G

Expansion

Tank

(3/4"-1 1/4")

through the system. Check the maintenance monitors on the unit to make sure the pump is

providing adequate flow.

Make sure that the flow rate is not greater than 1.2m/sec. (4 ft./sec.)

(3/4”: 19 L/min. (5 GPM), 1 1/4”: 49 L/min. (13 GPM))

If the flow is too low, the recirculation loop temperature will not be warm enough, if the flow is too

high, the lifetime of the unit will be reduced.

* Size the pump to provide at least 7.6 L/min. (2 GPM) @ 30kPa (10 ft.) of head + piping losses

•

If there are multiple circulation loops, try to make the flow rate 2.8 - 4.7 L/min. (.75-1.25 GPM) in each loop
*

* Use copper or stainless water piping for the entire system.

28

(1 1/4"-2")

Unit 6 Unit 2 Unit 1

System Controller

Storage tank supply line

(1 1/4"-2")

Storage tank return line

(Copper or Stainless Pipe)

(Copper or Stainless Pipe)

Storage Tank Circulation Pump 1

Storage Tank Circulation Pump 2

(if Necessary)

Gas Pipe

Hot Water

Storage Tank

Relief Valve

Hot water supply line

(Copper or Stainless Pipe)

Return line

circulation pump

Hot water return line

(Copper or Stainless Pipe)

Cold Water Supply

* Size the water supply piping to

allow for maximum flow rates

of the building.

* Set dipswitch 3 to OFF.

(See SC-201-6M Installation Manual

page 13)

* If the tank thermostat will control the pump

set dipswitch 2 to OFF.

(See SC-201-6M Installation Manual)

Do not connect more than one pump to the

tank thermostat.

Hot Water

Supply

Remote

Controller

Option 2-Unit

Control

B-2. Example of Installation with a Storage Tank and Recirculation System

The pump will push water through the Multi-System to heat up the tank.
When the return temperature is high, the flow within the device will be limited to 9.8 L/min. (2.6 GPM)*.

Thermostat

The system controller will stop the units from heating when the tank is up to temperature,

disconnect this

* Also

connector on units 2-6

Disconnect this Connector

Option 1-Tank

When installing 2 pumps in parallel

and the unit will cut the flow through it to 9.8 L/min. (2.6 GPM).

Install the plumbing so that a change in flow will not damage the pump.

System select connector

Connect to the “Sto-

rage system”

connector"

Thermostat Control

Pump Control

G

Wires (use

external relay)

(1 1/4"-2")

34 L/min. (9 GPM) (each) @ 120kPa (40 ft.) of head (71°C (160°F) setting or less) + piping losses through the system).

Verify the supply pressure to the units is at least 30 PSI.

* To achieve the highest recovery, size the storage tank circulation pump for maximum capacity.

* For the set temperature of the remote control, use the temperature (of the thermostat) + about 6°C (10°F).

29

Multi-System Wiring (Use SC-201-6M)

System Controller

* Connect these to the

remote control terminal
block in each unit

No.6

No.5

No.4

No.3

No.2

Unit 1

Disconnect this
Connector

Disconnect for system controller

Remote control
terminal block

Remote Controller Cord

Disconnect this
Connector

Unit 2

Remote
Controller

PCB

DPSW

12345678

90 90 89

B5 B5

PCB

102

Power
PCB

System select connectors

* The remote controller terminal

location may differ depending
on the unit.

Remote Control
terminal block

Remote Controller Cord

Disconnect this
Connector

Remote control
terminal block

Remote Controller Cord

30

Units 3-6

Power
PCB

PCB

Disconnect for system controller Disconnect for system controller

Power
PCB

* The connector location may

be slightly different on the
actual circuit boards than in
these illustrations.