Noritz proTOUGH NR83OD User manual

Potential dangers from accidents during installation and use are divided into the following three
categories. Closely observe these warnings, they are critical to your safety.
Prohibited Disconnect
Power Ground Be sure to do
WARNING: If the information in this manual is not followed exactly, a re or explosion may result
causing property damage, personal injury or death.
NORITZ AMERICA
CORPORATION
Installation Manual
TANKLESS GAS WATER HEATER
NR83OD (GQ-2457WS US) (Outdoor Installation)
DANGER indicates an imminently hazardous situation which,
if not avoided, will result in death or serious injury.
WARNING indicates a potentially hazardous situation which,
if not avoided, could result in death or serious injury.
CAUTION indicates a potentially hazardous situation which,
if not avoided, may result in minor or moderate injury.
DANGER
WARNING
CAUTION
SBB80YR-1
Rev. 11/20
Requests to Installers
• In order to use the water heater safely, read this installation manual carefully, and follow the
installation instructions.
• Failures and damage caused by erroneous work or work not as instructed in this manual are not
covered by the warranty.
• Check that the installation was done properly in accordance with this Installation Manual upon
completion.
• After completing installation, either place this Installation Manual in a plastic pouch and attach it to
the side of the Water Heater (or the inside of the pipe cover or recess box if applicable), or hand it
to the customer to retain for future reference.
CAUTION
*SBB80YR*
FOR USE IN RESIDENTIAL OR MANUFACTURED HOME APPLICATIONS.
Installation must conform with local codes, or in the absence of
local codes, the National Fuel Gas Code, ANSI Z223.1/NFPA 54-
latest edition and/or the Natural Gas and Propane Installation
Code CSA B149.1 - latest edition.
When applicable, installation must conform with the Manufactured
Home Construction and Safety Standard, Title 24 CFR, Part
3280 or the Canadian Standard CAN/CSA-Z240 MH Mobile
Homes, Series M86.
Noritz America reserves the right to discontinue, or change at any
time, the designs and/or specications of its products without notice.
Low NOx
Approved by
SCAQMD
14 ng/J or 20 ppm
(Natural Gas Only)

2
1.
Included Accessories
The following accessories are included with the unit.
Check for any missing items before starting installation.
Q’ty
ShapePart
1
each
Part Shape Q’ty
3
1
Remote Controller
(See p. 20) Remote Controller
Cord (6ft (2m))
1
2.
Optional Accessories
The accessories listed below are not
included with the units, but may be necessary
for installation.
Cross Recessed
Head Screw
Quick Connect Cord
(QC-2)
Q’ty
ShapePartPart Shape Q’ty
1
1
Remote Controller
Cord (26ft (8m))
1
each
Isolation Valves*
(includes pressure
relief valve)
Pipe Cover
(PC-2S) 1
1
Recess Box
(RB-700-1)
1
Remote Controller
Outdoor
Junction Box
Owner's Guide, Warranty,
Installation Manual
(this document)
* Isolation valves are necessary for ushing the Heat Exchanger.
They allow for easy ushing of the system.
Noritz Connect
Wireless Adapter
NWC-ADAPTER
(NAW-1 US)
1

3
Union
Quick Connect
cord
Union
Gas Valve
Shutoff
Valve
Shutoff Valve
Hot Water
Cold Water
Pressure
Relief
Valve
Union
Shutoff Valve
Size the piping to allow for the
maximum flow rates of the units.
The backflow preventer is
put up before it diverges.
Distance at center: 15.8 - 31.8 in. (401 - 808mm)
Distance on sides
2 - 18 in. (50 - 457mm)
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.
Make this distance as short
as possible.
*
The hot water temperature
will become unstable as the
pipe length increases.
G
Quick Connect
Cord
Remote Controller Cord
Gas Supply Piping
Cold Water Supply
Hot Water
Remote Controller
Terminal Block
Cord
Connector
Cord
Connector
3.
Quick Connect Multi System Installation
• The Quick Connect Multi System allows the installation of two units together utilizing only the Quick
Connect Cord.
* When connecting two units, use only a
single remote controller.
Note: Connect the remote
controller to only one
of the units.
System Diagram
• Insulate the hot water piping to prevent heat loss. Insulate and apply heating materials to the
cold water supply piping to prevent heat loss and freezing of pipes when exposed to excessively
cold temperatures.
The Quick Connect Cord is 6 ft.(2m) long. Install the units 2-18" (50 - 457mm) apart from each
other to ensure the cord will be able to reach between the units. (See Typical Plumbing diagram).
(If the distance between the two units is too great, not only will the cord not be able to reach,
but the water temperature may also become unstable because of the di󰀨erence in pipe length
between the two units).
Typical Plumbing

4
Check the Gas
• Check that the rating plate indicates the correct type of gas.
• Check that the gas supply line is sized for
180,000 Btuh.
Check the Power
• The power supply required is 120VAC, at 60Hz.
May result in re or electric shock.
Use Extreme Caution if Using With a Solar Pre-Heater
• Using this unit with a solar pre-heater can lead to unpredictable output temperatures and
possibly scalding. If absolutely necessary, use mixing valves to ensure output temperatures do
not get to scalding levels. Do not use a solar pre-heater with the quick-connect multi-system.
Precautions for Mobile Home Installation
• Verify that the gas supply type matches the gas type listed on the rating plate. If a gas conversion
must be done, follow the instructions listed in the gas conversion kit manual.
4. Before Installation
Do Not Use Equipment for Purposes Other Than Those Specied
• Do not use for other than increasing the temperature of the water supply, as unexpected accidents
may occur as a result.
Check Water Supply Quality
• If the water supply is in excess of 12 grains per gallon (200 mg/L) of hardness, acidic or otherwise
impure, treat the water with approved methods in order to ensure full warranty coverage.
WARNING
CAUTION
5. Choosing Installation Site
DANGER
Indoor
• This water heater is for outdoor installation only.
Never install it indoors.
Do not enclose the termination with corrugated
metal or other materials.
This will cause carbon monoxide
poisoning and a potential re
hazard.
* Locate the appliance in an area where leakage from the unit or connections will not result in damage
to the area adjacent to the appliance or to the lower oors of the structure. When such installation
locations cannot be avoided, a suitable drain pan, adequately drained, must be installed under the
appliance. The pan must not restrict combustion air ow.
* As with any water heating appliance, the potential for leakage at some time in the life of the product
does exist. The manufacturer will not be responsible for any water damage that may occur.

5
• Avoid places where res are common, such as those where gasoline,
benzene and adhesives are handled, or places in which corrosive gases
(ammonia, chlorine, sulfur, ethylene compounds, acids) are present.
Using the incorrect voltage may result in re or cracking.
• Avoid installation in places where dust or debris will accumulate.
Dust may accumulate and reduce the performance of the unit's fan.
This can result in incomplete combustion.
• Avoid installation in places where special chemical agents
(e.g., hair spray or spray detergent) are used.
Ignition failures and malfunction may occur as a result.
• Carbon Monoxide Poisoning Hazard. Do not install this water heater in a
recreational vehicle or on a boat.
• Install the water heater in a location where it is free from obstacles and stagnant air.
• Consult with the customer concerning the location of installation.
• Do not install the water heater near staircases or emergency exits.
• Do not install the water heater where the exhaust will blow on outer walls or material not resistant
to heat. Also consider the surrounding trees and animals.
The heat and moisture from the water heater may cause discoloration of walls and resinous materials,
or corrosion of aluminum materials.
• Do not locate the vent termination directed towards a window or any
other structure which has glass or wired glass facing the termination.
• Install in a location where the exhaust gas ow will not be a󰀨ected by
fans or range hoods.
• Take care that noise and exhaust gas will not a󰀨ect neighbors.
Avoid installation on common walls as the unit will make some
operational noises while it is running.
• Avoid installation where the unit will be exposed to excessive winds.
• Before installing, make sure that the vent termination will have the proper
clearances according to the National Fuel Gas Code (ANSI Z223.1-latest
edition ) or the Natural Gas and Propane Installation Code (CSA B149.1).
• If the unit is installed in a location with very high humidity, condensate may form inside the unit and/or
cause incomplete combustion, damage to the electrical components, or electric leakage.
Prohibited
WARNING
CAUTION
Prohibited
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:
1) This water heater can only be used in outdoor applications if the usage is restricted to summertime
usage exclusively.
2) The water heater can be used for hot water only and not in a combination of domestic and space heating.

6
6. Installation Clearances
Before installing, check for the following:
Install in accordance with relevant building and mechanical codes, as well as any local, state or
national regulations, or in the absence of local and state codes, to the National Fuel Gas Code
ANSI Z223.1/NFPA 54 – latest edition. In Canada, see the Natural Gas and Propane Installation
Code CSA B149.1 - latest edition for detailed requirements.
WARNING
Item Check
• When installing the unit on a balcony, etc., secure an
evacuation route of 24" (600mm) or more in width.
• Provide clearance of 24" (600mm) or more in front of
the unit to facilitate inspection and repair. Do install the
unit in a location where the unit is out of reach, such as
the wall of the second oor.
• When installing the unit in a common side corridor, provide
a clearance of 47" (1,190mm) or more in front of the unit.
• Set the bottom edge of the exhaust port about
84" (2,130mm) from the corridor oor.
Handrail
common side
corridor
balcony, etc.
Handrail
about 84"
(2,130mm)
• Maintain the following clearance from both combustible
and non-combustible materials.
24" (600mm)
or more
36" (900mm)
or more
Surrounding the area of installation
24" (600mm)
or more
47" (1,190mm) or more
Required Clearances From Heater
Illustration
6" (150mm)
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 the Natural Gas and Propane Installation Code
CSA B149.1.
DescriptionRef
A=
Clearance above grade, veranda, porch,
deck, or balcony
B=
Clearance to window or door that may
be opened
C=
Clearance to permanently closed window
D=
Vertical clearance to ventilated soffit located
above the terminal within a horizontal distance
of 2 feet (61 cm) from the center line of the terminal
*
E=
Clearance to unventilated soffit *
F=
Clearance to outside corner *
G=
Clearance to inside corner *
H=
Clearance to each side of center line
extended above meter/regulator assembly
I=
Clearance to service regulator vent outlet
J=
Clearance to nonmechanical air supply
inlet to building or the combustion air inlet
to any other appliance
K=
Clearance to a mechanical air supply inlet 6 ft (1.83 m)
L=
Clearance above paved sidewalk or paved
driveway located on public property
Clearance under veranda, porch, deck,
or balcony
7 ft (2.13 m)†
M=
1
In accordance with the current CSA B149.1 Natural Gas and Propane Installation Code
2
In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Gas Code
† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single
family dwellings and serves both dwellings.
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
* Clearance in accordance with local installation codes and the requirements of the gas supplier.
Clearance to opposite wall is 24 inches (60 cm).
12 in (30 cm)‡
*
12 in (30 cm)
6 in (15 cm) for appliances
≤ 10,000 Btuh (3kW), 12 in
(30 cm) for appliances > 10,000
Btuh (3kW) and ≤ 100,000 Btuh
(30 kW), 36 in (91 cm) for
appliances > 100,000 Btuh (30 kW)
Above a regulator within 3 ft (91 cm)
horizontally of the vertical center line of
the regulator vent outlet to a maximum
vertical distance of 15 ft (4.5 m)
4 ft (1.2 m) below or to side
of opening; 1 ft (300 mm)
above opening
6 in (15 cm) for appliances
≤ 10,000 Btuh (3kW), 12 in
(30 cm) for appliances > 10,000
Btuh (3kW) and ≤ 100,000 Btuh
(30 kW), 36 in (91 cm) for
appliances > 100,000 Btuh (30 kW)
4 ft (1.2 m) below or to side
of opening; 1 ft (300 mm)
above opening
*
*
*
*
**
*
*
*
3 ft (91 cm) above if within
10 ft (3 m) horizontally
*
12 in (30 cm)
US Non-Direct Vent Installation
2
Canadian Non-Direct Vent Installation
1
Vent Terminal
Air Supply Inlet
Area Where Terminal
is Not Permitted

8
Illustration
7. Installation
Check
4. Drill holes for the remaining four screws.
5. Hang the unit again by the rst screw, and then
insert and tighten the remaining four screws.
6. Take waterproong measures so that water does
not enter the building from screws mounting the
device.
• Make sure the unit is installed securely so that it will
not fall or move due to vibrations or earthquakes.
Securing to the wall
1. Drill a single screw hole, making sure to hit a stud.
2. Insert and tighten the screw and hang the unit by
the upper wall mounting bracket.
3. Determine the positions for the remaining four screws
(two for the top bracket and two for the bottom), and
remove the unit.
• The weight of the device will be applied to the wall. If the strength of the wall is not
su󰀩cient, reinforcement must be done to prevent the transfer of vibration.
• Do not drop or apply unnecessary force to the device when installing. Internal parts may
be damaged and may become highly dangerous.
• Install the unit on a vertical wall and ensure that it is level.
Locating Screw Holes
Mounting
Structure
• When installing with bare hands, take caution to
not inict injury.
• Be careful not to hit electrical wiring, gas, or water
piping while drilling holes.
Item
CAUTION
Be sure to do
Mounting Bracket
(upper)
Anchoring Screw
Location of Screw Hole
Locating Screw Holes
Installations at Elevations
Above 2,000 ft.
• Adjust the dip switches as illustrated in the table to
the right if this water heater is installed at an altitude
of 2000 ft. (610m) or higher.
• Disconnect power to the water heater before
changing the dip switches. Failure to perform this
step will result in a "73" code displayed on the remote
controller and a cease in operation. If this occurs,
disconnect, then reconnect power to the water heater
to reset the system.
Note : Please refer to page 20 for the location of the
dip switch bank.
* Do not change any other dipswitches.
* High elevation adjustment.
65
2,001 - 4,000 ft (611 - 1,220m)
0 - 2,000 ft (0 - 610m)
ON= OFF=
4,001 - 6,000 ft (1,221 - 1,830m)
6,001 - 8,000 ft (1,831 - 2,440m)

9
Follow the instructions from the gas supplier.
8. Gas Piping
Gas Type
The gas type indicated on the water heater rating plate (NG or LP) must match the type of gas being supplied to the water heater.
Gas Conversions
If the gas type supplied does not match the gas type on the rating plate, obtain a replacement unit with the proper gas type.
If a gas type conversion must be made, there are conversion kits available for some models. [The conversion kit shall be
installed by a qualied service agency in accordance with the manufacturer’s instructions and all applicable codes and
requirements of the authority having jurisdiction. The qualied service agency is responsible for the proper installation of
this kit. Improper installation of this kit will void the warranty.]
Meter
The gas meter must be sized properly for the water heater and other gas appliances to operate properly.
Select a gas meter capable of supplying the entire btuh demand of all gas appliances in the building.
The guidelines and examples we have provided in this manual section are for reference only.
The sizing and installation of the gas system for this water heater, as with any gas appliance, is the sole respon sibility
of the installer. The installer must be professionally trained to do such work and must always follow all local
and national codes and regulations. Gas line sizing calculations must be performed for every installation.
Please contact Noritz America at 866-766-7489 if you have any questions or concerns.
CAUTION
Regulators
Ensure that all gas regulators used are operating properly and providing gas pressures within the specied range of the
water heater being installed. Excess gas inlet pressure may cause serious accidents.
Pressure
Check the gas supply pressure immediately upstream at a location provided by the gas company.
Supplied gas
pressure must be within the limits shown in the specications section with all gas appliances operating. The inlet gas
pressure must be within the range specied. This is for the purposes of input adjustment. Low gas pressure may
cause a loss of ame or ignition failure at other appliances in the home, which may result in unburned gas in the home.
Serious accidents such as re or explosion may result.
Measuring Gas Pressure
In order to check the gas supply pressure to the unit, a tap is provided on the gas inlet.
Remove the 9/32” hex head/Philips screw from the tap, and connect a manometer
using a silicon tube. Open up at least 2 xtures and hold in the maximum manifold
pressure button on the circuit board. Please call Noritz for details.
WARNING
CAUTION
Pressure Test
The appliance and its gas connections must be leak tested before placing the appliance in operation. The appliance
must be isolated from the gas supply piping system by closing its individual manual shuto󰀨 valve during any
pressure testing of the gas supply piping system at test pressures equal to or less than ½ psig (3.5 kPa). We do
not recommend pressure testing in excess of ½ psig (3.5kPa). If it must be done, the appliance and its individual
shuto󰀨 valve must be completely disconnected from the gas supply piping system during the test process.
Pipe Sizing/Flexible Connectors
A gas shuto󰀨 valve must be installed on the supply line. Gas ex lines are not recommended unless the minimum
inside diameter is ¾” or greater and the rated capacity of the connector is equal to or greater than the BTU
capacity of the water heater. Gas piping shall be in accordance with local utility company requirements and/
or in the absence of local codes, use the latest edition of National Fuel Gas Code (NFPA54GC), ANSI
Z223.1. In Canada, use the latest edition of CSA B149.1, National Gas and Propane installation code.
Size the gas line according to total btuh demand of the building and length from the meter or regulator so
that the following supply pressures are available even at maximum demand.
WARNING
Natural Gas Supply Pressure
Min 4” WC
Max 10.5” WC
LP Gas Supply Pressure
Min 8” WC
Max 14” WC

10
Reference Tools & Sample Calculations
The tables and samples below are for reference only. The professional sizing and installing the gas
line should always run the appropriate calculations before all installations.
CAUTION
Which Table to Use
• For NG installations with the initial supply pressure at point of delivery (at the meter, for example) is
less than 8” WC, use the 0.5” WC pressure drop table (Table 1).
• For NG installations with the initial supply pressure at point of delivery is greater than or equal to 8”
WC, use the 3.0” pressure drop table (Table 2).
• For all LP installation use (Table 3)
The inlet pressure must be at least 5” WC for NG or 8” WC for LP for all appliances in the gas system.
If the inlet gas pressure drops below 5” WC for NG or 8” WC for LP, the heater may continue to operate,
but the other appliances in the house may experience ame loss or ignition failure, which can result in gas
leakage into the home. Refer to the NFPA 54 for details.
Please contact Noritz for details. For corrugated stainless steel tubing (CSST) capacity tables, please
consult with the manufacturer.
Pipe
Size
Length (including ttings)
10' 20' 30' 40' 50' 60' 70' 80' 90' 100' 125'
(3m) (6m) (9m) (12m) (15m) (18m) (21m) (24m) (27m) (30m) (38m)
3/4" 360 247 199 170 151 137 126 117 110 104 92
1" 678 466 374 320 284 257 237 220 207 195 173
1 1/4" 1,390 957 768 657 583 528 486 452 424 400 355
1 1/2" 2,090 1,430 1,150 985 873 791 728 677 635 600 532
2" 4,020 2,760 2,220 1,900 1,680 1,520 1,400 1,300 1,220 1,160 1,020
2 1/2" 6,400 4,400 3,530 3,020 2,680 2,430 2,230 2,080 1,950 1,840 1,630
3" 11,300 7,780 6,250 5,350 4,740 4,290 3,950 3,670 3,450 3,260 2,890
4" 23,100 15,900 12,700 10,900 9,660 8,760 8,050 7,490 7,030 6,640 5,890
Table 1. For Less than 8” WC initial supply pressure
Maximum Natural Gas Delivery Capacity (0.5” Pressure Drop) [Schedule 40 Metallic Pipe]
Values in Table are in Cubic Feet of Gas per Hour (0.60 Specic Gravity, 0.5” Pressure Drop, inlet pressure less than 2psi). Contact your gas
supplier for BTU/Cubic Foot ratings. For simplication of your calculations, 1 Cubic Foot of Gas is approximately equivalent to 1000 BTU.
Instructions
1. Size each outlet branch starting from the furthest
using the Btuh required and the length from the meter.
2. Size each section of the main line using the length to
the furthest outlet and the Btuh required by everything
after that section.
Sample Gas Line
Sample Calculation - (Using 0.5” WC Pressure Drop Table)
Outlet A: 45' (13.5m) (Use 50' (15m)), 50,000 Btuh requires 1/2"
Outlet B: 40' (12m), 65,000 Btuh requires 1/2"
Section 1: 45' (13.5m) (Use 50' (15m)), 115,000 Btuh requires 3/4"
Outlet C: 30' (9m), 35,000 Btuh requires 1/2"
Section 2: 45' (13.5m) (Use 50' (15m)), 150,000 Btuh requires 3/4"
Outlet D: 25' (7.5m) (Use 30' (9m)), 25,000 Btuh requires 1/2"
Section 3: 45' (13.5m) (Use 50' (15m)), 175,000 Btuh requires 1"
Outlet E: 25' (7.5m) (Use 30' (9m)), 180,000 Btuh requires 3/4"
Section 4: 45' (13.5m) (Use 50' (15m)), 355,000 Btuh requires 1 1/4"
Natural Gas
Meter
Noritz Tankless Gas Water Heater
(180,000 Btuh)
Clothes Dryer
(35,000 Btuh)
Barbecue
(50,000 Btuh)
Gas Range Stove
(65,000 Btuh)
10' (3m) 10' (3m)
10' (3m)
10' (3m)
5' (1.5m)
5' (1.5m)
5' (1.5m)
5' (1.5m)5' (1.5m) 5' (1.5m)
Gas Fireplace
(25,000 Btuh)
Section 3 Section 2 Section 1
Outlet A
Outlet B
Outlet C
Outlet D
Outlet E
Section 4

11
Table 2. For 8” WC – 10.5” WC initial supply pressure
Maximum Natural Gas Delivery Capacity (3.0” Pressure Drop) [Schedule 40 Metallic Pipe]
Values in Table are in Cubic Feet of Gas per Hour (0.60 Specic Gravity, 3.0” Pressure Drop, 8.0” WC or greater supply pressure, inlet
pressure less than 2psi). Contact your gas supplier for BTU/Cubic Foot ratings. For simplication of your calculations, 1 Cubic Foot of
Gas is approximately equivalent to 1000 BTU.
Natural Gas
Meter
Clothes Dryer
(35,000 Btuh)
Barbecue
(50,000 Btuh)
Gas Range Stove
(65,000 Btuh)
10' (3m) 10' (3m)
10' (3m)
10' (3m)
5' (1.5m)
5' (1.5m)
5' (1.5m)
5' (1.5m)5' (1.5m) 5' (1.5m)
Gas Fireplace
(25,000 Btuh)
Instructions
1. Size each outlet branch starting from the furthest
using the Btuh required and the length from the meter.
2. Size each section of the main line using the length to
the furthest outlet and the Btuh required by everything
after that section.
Sample Gas Line
Sample Calculation (Using 3.0” WC Pressure Drop T
able)
Outlet A: 45' (13.5m) (Use 50' (15m)), 50,000 Btuh requires 1/2"
Outlet B: 40' (12m), 65,000 Btuh requires 1/2"
Section 1: 45' (13.5m) (Use 50' (15m)), 115,000 Btuh requires 1/2"
Outlet C: 30' (9m), 35,000 Btuh requires 1/2"
Section 2: 45' (13.5m) (Use 50' (15m)), 150,000 Btuh requires 1/2"
Outlet D: 25' (7.5m) (Use 30' (9m)), 25,000 Btuh requires 1/2"
Section 3: 45' (13.5m) (Use 50' (15m)), 175,000 Btuh requires 1/2"
Outlet E: 25' (7.5m) (Use 30' (9m)), 180,000 Btuh requires 1/2"
Section 4: 45' (13.5m) (Use 50' (15m)), 355,000 Btuh requires 3/4"
Section 3 Section 2 Section 1
Outlet A
Outlet B
Outlet C
Outlet D
Outlet E
Section 4
Noritz Tankless Gas Water Heater
(180,000 Btuh)
Pipe
Size
Length (including ttings)
10' 20' 30' 40' 50' 60' 70' 80' 90' 100' 125'
(3m) (6m) (9m) (12m) (15m) (18m) (21m) (24m) (27m) (30m) (38m)
1/2" 454 312 250 214 190 172 158 147 138 131 116
3/4" 949 652 524 448 397 360 331 308 289 273 242
1" 1,787 1,228 986 844 748 678 624 580 544 514 456
1 1/4" 3,669 2,522 2,025 1,733 1,536 1,392 1,280 1,191 1,118 1,056 936
1 1/2" 5,497 3,778 3,034 2,597 2,302 2,085 1,919 1,785 1,675 1,582 1,402
2" 10,588 7,277 5,844 5,001 4,433 4,016 3,695 3,437 3,225 3,046 2,700
2 1/2" 16,875 11,598 9,314 7,971 7,065 6,401 5,889 5,479 5,140 4,856 4,303
3" 29,832 20,503 16,465 14,092 12,489 11,316 10,411 9,685 9,087 8,584 7,608
4" 43,678 30,020 24,107 20,632 18,286 16,569 15,243 14,181 13,305 12,568 11,139
Table 3. Maximum Undiluted Propane (LP) Delivery Capacity in Thousands of
BtuH (0.5” WC Pressure Drop) [Schedule 40 Metallic Pipe]
For reference only. Please consult gas pipe manufacturer for actual pipe capacities.
Final Check
When the installation is complete, verify that inlet gas pressure for the entire gas system does not
drop below 5” WC for NG or 8” WC for LP at all appliances. This can be tested by turning on all
gas burning appliances including the water heater, then check the inlet pressure at each appliance
to verify all appliances are receiving a minimum of 5” WC for NG or 8” WC for LP. If all appliances
are not receiving the minimum inlet pressure the gas piping system may need to be changed.
CAUTION
Pipe
Size
Length (including ttings)
10' 20' 30' 40' 50' 60' 80' 100' 125' 150' 175' 200'
(3m) (6m) (9m) (12m) (15m) (18m) (24m) (30m) (38m) (45m) (53m) (60m)
1/2" 291 200 160 137 122 110 101 94 89 84 74 67
3/4" 608 418 336 287 255 231 212 197 185 175 155 140
1" 1,150 787 632 541 480 434 400 372 349 330 292 265
1 1/4" 2,350 1,620 1,300 1,110 985 892 821 763 716 677 600 543
1 1/2" 3,520 2,420 1,940 1,660 1,480 1,340 1,230 1,140 1,070 1,010 899 814
2" 6,790 4,660 3,750 3,210 2,840 2,570 2,370 2,200 2,070 1,950 1,730 1,570

12
9.
Water Piping
This appliance is suitable for combination potable water and space heating applications. It cannot be used for space
heating applications only. Do not use this appliance if any part has been underwater. Immediately call a qualied
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 backow 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 Shuto󰀨 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 180,000 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 Shuto󰀨 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 ow of water. This may cause unwarranted discharge of the valve.
Piping and components connected to the water heater shall be suitable for use with potable water.
Toxic chemicals, such as those used for boiler treatment, shall not be introduced into the potable water.
A water heater used to supply potable water may not be connected to any heating system or components
previously used with a nonpotable water heating appliance.
When water is required in one part of the system at a higher temperature than in the rest of the system, means
such as a mixing valve shall be installed to temper the water to reduce the scald hazard.
Installation and service must be performed by a qualied plumber. In the
Commonwealth of Massachusetts, this product must be installed by a licensed
plumber or gas tter 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 g-
ure on the right).
- Do not cover the water drain plug with insulation so that water in the
pipe can be drained. (Refer to the gure in the right.)
•
Use a union coupling or exible pipe for connecting the pipes to reduce the force applied to the piping.
• Do not use piping with a diameter smaller than the coupling.
• When feed water pressure is too high, insert a depressurizing valve, or take water hammer prevention measure.
• Avoid using joints as much as possible to keep the piping simple.
• Avoid piping in which an air holdup can occur.
• If installing the unit on a roof:
• About lower-level hot water supply
If the unit is installed on a roof to supply water to the levels below, make sure that the water pressure supplied
to the unit does not drop below 29 psi. It may be necessary to install a pump system to ensure that the water
pressure is maintained at this level.
Check the pressure before putting the unit into operation.
Failure to supply the proper pressure to the unit may result in noisy operation, shorter lifetime of the unit, and
may cause the unit to shut down frequently.
Completely insulate
the water inlet and
outlet fittings.
Insulate the water
supply valve completely.
Do not cover the water
drain plug with insulation
so that water in the pipe
can be drained.

13
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 o󰀨 valve (near the inlet).
• In order for the client to use the water heater
comfortably, 14 to 70 PSI (98.1 to 491 kPa) 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
relief valve and wet the oor.
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
has been treated with chromates, boiler seal or
other chemicals.
• The longer the piping, the greater the heat loss.
Try to make the piping as short as possible.
• Use mixing valves with low water resistance.
Use shower heads with low pressure loss.
• If necessary, use a pump or other means to
ensure 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.
Freeze Prevention
• Freezing is prevented within the device automatically unless the outside temperature without wind
is below -4°F (-20°C).
• If this model is installed in an area where the outside temperature can approach freezing conditions
of -4°F (-20°C) or below, then additional freeze protection measures must be used. For temporary
freeze protection measures, refer to the Owner's Guide.
• The freeze prevention heaters will not prevent the plumbing external to the unit from freezing.
Protect this plumbing with insulation, heat tape or electric heaters, solenoids, or pipe covers.
• In order for the freeze prevention heaters to operate, the water heater must have power at all times.
Damage to the water heater as a result
of poor water quality is not covered by
the Limited Warranty. To ensure full
warranty coverage, treat or condition
water that exceeds the target levels
provided in this table.
Source: EPA National Secondary Drinking Water
Regulations (40 CFR Part 143.3)
Total Hardness* : 200 mg/L (12 gpg) or less
Aluminum : 0.05 to 0.2 mg/L or less
Chloride : 250 mg/L or less
Copper : 1 mg/L or less
Iron : 0.3 mg/L or less
Manganese : 0.05 mg/L or less
pH : 6.5 - 8.5
Total Dissolved Solids : 500 mg/L or less
Zinc : 5 mg/L or less
Sulfate ion : 250 mg/L or less
Residual chlorine : 4 mg/L or less
* Maximum limit suggested by Noritz.

14
Water Treatment
Water Treatment System
City Water Supply
Pressure
Relief
Valve
Hot Water to Fixtures
Shutoff Valve
Drain
Cold to Water
Heater
Optional Sediment
Filter
Water Treatment Device
Shutoff Valve
Type of
Water
Hardness
Level
Treatment
Device*
Flush Frequency**
Soft
0-1 gpg
1-3 gpg
(0-17 mg/L)
None None
Slightly Hard
(17-51 mg/L)
None None
Moderately
Hard
Hard
3-7 gpg
(51-120 mg/L)
ScaleShield or
Water Softener
ScaleShield or
Water Softener
Once a Year*** or
Flashing the error code****
Once a Year*** or
Flashing the error code****
Once a Year*** or
Flashing the error code****
Once a Year*** or
Flashing the error code****
7-10 gpg
(120-171 mg/L)
Very Hard
10-12 gpg
(171-200 mg/L)
ScaleShield or
Water Softener
ScaleShield or
Water Softener
Extremely
Hard
> 12 gpg
(> 200 mg/L)
Residential Use Treatment Guidelines
Tankless Gas
Water Heater
* When selecting a treatment device, you must
consult with the device’s spec sheet and
installation manual for guidelines and limitations.
Not all water supplies are compatible -
a water test may be required.
**
Install Noritz Isolation Valves to allow for flushing.
***Flushing is required if a water treatment
device is not installed.
**** The error code "㻯㻌㻌㻌㻏" will be flashing in the
Display Window.
= 1, 2, 3, 4, F
# = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
▲The illustration is an example. Please check with the actual water heater about the position of piping, and form.
If this water heater will be installed in an application where the supply water is hard, the water must be
treated with either the Noritz ScaleShield or a water softener. Refer to the below tables for suggested
treatment and maintenance measures to be taken based on the water hardness level. If this water heater
will be installed in an application where the supply water is hard, Scale Build-up may cause damage to
the Heat Exchanger. In this case, this water heater detects Scale Build-up in the Heat Exchanger
and then the error code " "* will ash on the Remote Controller. When the error code " "*
is displayed, the Heat Exchanger needs to be ushed to prevent damage from Scale Build-up. Refer to the
"Procedure for ushing the Heat Exchanger" on page 15 or contact Noritz America for more information.
(http://support.noritz.com/ or 866-766-7489)
Damage to the water heater as a result of the items below is not covered by the Noritz America Limited
Warranty.
• Water in excess of 12 gpg (200mg/L) of hardness
• Poor water quality (See the Water Quality List on page 13.)
• The water heater has displayed a " " error code indicating Scale Build-up, but the heat exchanger
has not been ushed.
Note: Water softeners may be regulated by the local water jurisdiction, consult with the manufacturer for
code, sizing, and installation guidelines; the below diagram is for reference only. For more information
about ScaleShield, contact Noritz America at http://support.noritz.com/ or 866-766-7489.
* = 1, 2, 3, 4, F
# = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

15
Procedure for Flushing the Heat Exchanger
If the error code “C
#*~C #*” is flashing on the Remote C
, it means
there is Scale Build-up
in the Heat Exchanger.The Heat Exchanger needs to be flushed** to remove the Scale Build-up.
Damage to the water heater due to Scale Build-up is not covered by the water heater's warranty.
To clear the error code “C #*~C #*”, the Heat Exchanger must be flushed.
If the error code “C #*” is displayed and flashing on the Remote Controller, please contact
Noritz America (866-766-7489).
* = 1, 2, 3, 4, F #= 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
** Connect the blue connector marked "FLUSH" for flushing near the Circuit Board when flushing the Heat Exchanger.
After connecting it, the water heater is set to “Flushing Mode”.
㻮㼍㼟㼕㼏㻌㻼㼞㼛㼏㼑㼐㼡㼞㼑
䍾㻼㼞㼛㼏㼑㼐㼡㼞㼑㻌䠍㻚㻌
The preparation of the flushing system䍿
1. Close the gas supply valve.
2. Close the water inlet valve (V1) and the water outlet valve (V2).
3. Connect the one drain hose (H1) to the drain valve (V3), and then the other to the
circulating pump.
4. Connect the drain hose (H2) to the circulating pump.
5. Connect the drain hose (H3) to the drain valve (V4).
6. Pour 1 gallon of “㻯㼍㼘㼏㼕㼡㼙㻘㻌㻸㼕㼙㼑㻌㼍㼚㼐㻌㻾㼡㼟㼠㻌㻾㼑㼙㼛㼢㼍㼘㻌㻼㼞㼛㼐㼡㼏㼠” and 㻝㻌gallon water into the bucket.
Noritz recommends “㻯㼍㼘㼏㼕㼡㼙㻘㻌㻸㼕㼙㼑㻌㼍㼚㼐㻌㻾㼡㼟㼠㻌㻾㼑㼙㼛㼢㼍㼘㻌㻼㼞㼛㼐㼡㼏㼠”㻌for flushing.
7. Place the both drain hoses (H2 and H3) into the bucket filled with the flushing solution.
8. Open the both drain valves (V3 and V4).
The water heater must remain connected to electrical power
when flushing the Heat Exchanger.
*** Isolation valves may be purchased as an accessory from㻌㼍㼚㻌㼍㼡㼠㼔㼛㼞㼕㼦㼑㼐㻌㻺㼛㼞㼕㼠㼦㻌㼣㼔㼛㼘㼑㼟㼍㼘㼑㼞.
They allow for full diagnostic testing and easy flushing of the system㻚
㻌㻌㻌㻌㻌㻌㻯㼛㼚㼠㼍㼏㼠㻌㻺㼛㼞㼕㼠㼦㻌㻭㼙㼑㼞㼕㼏㼍㻌㼒㼛㼞㻌㼙㼛㼞㼑㻌㼕㼚㼒㼛㼞㼙㼍㼠㼕㼛㼚㻚㻔㻤㻢㻢㻙㻣㻢㻢㻙㻣㻠㻤㻥㻕
This procedure is only intended for use by a qualified service professional or authorized Noritz
Service Representative. Any unauthorized use of this procedure may result in voiding the
warranty.Please contact Noritz America (866-766-7489) for additional support.
Gas
Supply
Water
Inlet
Water
Outlet
V1
V3
V4
H3
H1
Water Heater
Bucket
Flushing
Solution
Circulating
Pump
H2
Gas Supply
Valve
V1
V3
V2
V4
Continue to connec
t
Isolation valves*** are necessary
for flushing the Heat Exchanger.
Water Outlet
Water Inlet
V2
If a submersible pump is used,
then only 2 hoses will be needed (H1 and H3).

16
䍾㻼㼞㼛㼏㼑㼐㼡㼞㼑㻌䠏㻚㻌Cleaning the Heat Exchanger䍿
The flushing solution needs to be rinsed and cleaned out of the water heater.
Below is the way to rinse and clean the flushing solution.
1. Remove both drain hoses (H2 and H3) from the bucket. And then place the drain hose (H3)
into the sink or outside to drain.
2. Close the drain valve (V3) and then open the water inlet valve (V1).
Do not open the fresh water outlet valve (V2).
3.
Clean the water heater with fresh water for 3 minutes or more.
(Needs to have enough time to clean the water heater.)
4. Close the drain valve (V4) and then remove the drain hose (H3) from the drain valve (V4).
5. Remove the drain hose (H1) from the drain valve (V3).
8. Open the gas supply valve and water outlet valve (V2).
9. Check for correct operation of the water heater
.
6. Disconnect the blue connector marked "FLUSH" near the Circuit Board.
The code “C00” goes out on the Remote Controller.
7. Close the Front Cover.
Disconnect
Detects the flow 1 minute passes
䍾㻼㼞㼛㼏㼑㼐㼡㼞㼑㻌䠎㻚㻌
Flushing the Heat Exchanger (For Single Unit)
䍿
1. Open the Front Cover.
2. Connect the blue connector**** marked "FLUSH" for flushingnear the Circuit Board.
3. Then the code “CCC” is displayed on the 㻾㼑㼙㼛㼠㼑㻌㻯㼛㼚㼠㼞㼛㼘㼘㼑㼞㻚
4. Turn on the circulating pump to circulate the flushing solution through the water heater
for 1 hour at a rate of 1.5 gallons per minute or more.
5. The code “C60” is displayed on the Remote Controller when the water heater detects the flow
of the flushing solution.
When 1 minute passes, the code “C60” will change to “C59” on the Remote Controller.
6. When 1 hour passes, the code “C00” is flashing on the Remote Controller.
Do not disconnect the blue connector marked "FLUSH" for flushing.
7. Turn off the circulating pump.
**** The connector color is blue
and labeled “FLUSH”.
Please check whether the reverse connection of the hose (H1) and (H3) if the display number will not change.
In that case, the flow rate of the flushing solution may be under 1.5 gallons per minute.
Flashing
FLUSH
Connect
CCC
CCC C60 C59
C00
Manifold Plate
Circuit Board
Water Heater
Circuit Board
****** LED light is only for “NCC199OD(GQ-C3257WZ US)” and“NCC199DV(GQ-C3257WZ-FF US)”.
It is flashing while flushing. When 1 hour passes, LED light is OFF.
LED light is flashing******
Water Heater
Manifold Plate

17
㻵㼚㻌㼏㼍㼟㼑㻌㼛㼒㻌㼠㼔㼑㻌䇾㻽㼡㼕㼏㼗㻌㻯㼛㼚㼚㼑㼏㼠㻌㻹㼡㼘㼠㼕㻌㻿㼥㼟㼠㼑㼙㻌㻼㼞㼛㼏㼑㼐㼡㼞㼑䇿
1. Connect the blue connector marked "FLUSH" for unit needing to be flushed.
(The water heater is isolated from Quick Connect Multi system when the blue connector marked
"FLUSH" for flushing is connected. Not need to disconnect the 㻽㼡㼕㼏㼗 Connect Cord.)
2.Then the code “CCC” or “FCC” is displayed on the 㻾㼑㼙㼛㼠㼑㻌㻯㼛㼚㼠㼞㼛㼘㼘㼑㼞㻚
3. Turn on the circulating pump to circulate the flushing solution through the water heaters
for 1 hour at a rate of 1.5 gallons per minute or more.
(LED light is flashing while flushing the heat exchanger. See the “㻼㼞㼛㼏㼑㼐㼡㼞㼑㻌㻞㻚㻡”.)
4. When 1 hour passes, the code “C00” is flashing on the Remote Controller.
Do not disconnect the blue connector marked "FLUSH" for flushing.
5. Turn off the circulation pump.
6. Rinse and clean the flushing solution out of the water heaters in accordance with “㻼㼞㼛㼏㼑㼐㼡㼞㼑㻌㻟”.
(See the “㻼㼞㼛㼏㼑㼐㼡㼞㼑㻌㻟㻚㻝㻙㻟㻚㻡”.)
7. Disconnect the blue connector marked "FLUSH" for flushing.
The Code “C00” goes out on the Remote Controller.
8. Close the Front Covers.
9. Open the gas supply valves and water outlet valves.
10. Check for correct operation of the water heaters.
is displayed when the Main Water Heater's blue connector is connected.
is displayed when the Sub Water Heater's blue connector is connected.
Main Water HeaterSub Water Heater
FLUSH
Connect
Circuit Board
Remote Controller
Quick Connect Cord
CCC
FCC
CCC
FCC
Detects the flow C60 C59 Flashing
C00
. . .
Detects the flow C60 C59 Flashing
C00
. . .
(Ex. : The display when the both water heaters are flushed at the same time.)
The remaining time of flushing gives indication priority to the connector which is connected later.
Connect
Main Water Heater's
Blue Connector
CCC C50
Connect
Sub Water Heater's
Blue Connector
Detects the flow
FCC C60
Detects the flow
Flashing
C00
1 hour passes
Manifold Plate
10 minutes pass
Do not need to disconnect.

18
Recirculation System
Combination Potable Water and Space Heating System
Cold Water Supply
Isolation
Kit(*4)
Gas Supply
Aquastat(*3)
Pump Control Signal(*2)
Relay for Pump
(if larger than 85 Watts)
Hot Water
Optional 8-10 Gallon
Storage Tank
(To alleviate cold water sandwich)
Globe
Valve
Pump(*1)
Expansion Tank
(Install according
to local code)
Fixtures
Hot Water Return
R
B
W
Pump
120VAC
105
Neutral
Ground
Live
S
Isolation
Kit(*1)
Gas Supply Backflow Preventer
(optional)
Check
Valve(*3)
Cold Water
Supply
Mixing Valve(*5)
Hot Water
Pump(*2)
Flow Switch(*4)
Fixtures
Air Handler
Use Honeywell Aquastat
(Model L6006A or L6006C)
Aquastat Wiring
Optional
Expansion Tank(*6)
Notes:
1. Size the pump to provide a maximum of 2 GPM
(7.5 L/min.) through the system at 10 ft (3m) 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.
4. Noritz recommends the use of an Isolation Kit with
the installation.
These kits include an integrated shut-off and service
valve with unions and a pressure relief valve.
Notes:
1. Noritz recommends the use of an Isolation Kit with
the installation.
These kits include an integrated shut-off and service
valve with unions and a pressure relief valve.
2. Size the pump to provide
a maximum of 3 GPM
(11.3 L/min.) 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 3 GPM (11.3 L/min.).
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 scalding.
7.
The water heater cannot be used for space heating applications only.
8. Only POTABLE water may be plumbed through
the water heater.
6. Expansion tank required if a backflow preventer is installed.
If the Air Handler does not control the water flow automatically, the Scale detection feature will not work.
3. Set the Aquastat to 10˚F below the set output temperature.
An aquastat is the minimum pump control requirement
in order to maintain the full recirculation waranty.
10. Plumbing Applications

19
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.
Do not connect electrical power to the unit until all electrical wiring has been completed.
Consult a qualied electrician
for the electrical work.
11. Electrical Wiring
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.
• The electrical supply required by the water heater is
120VAC at 60 Hz.
The power consumption may be up to 230W or higher if
using optional accessories.
Use an appropriate circuit.
• Do not disconnect the power supply when not in use. When
the power is o󰀨, the freeze prevention in the water heater
will not activate, resulting in possible freezing damage.
• 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.
Disconnect Power
Electrical Shock Hazard
Do not turn power on until electrical wiring is nished. Disconnect power before servicing.
Failure to do so may result in death or serious injury from electrical shock.
WARNING
Electrostatic discharge can a󰀨ect 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
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.
Junction Box Power Cord
Ground

20
Remote Controller
• Applicable Model
Install the remote controller according to the instructions in the Installation Guide (p. 26).
* Only one remote controller can be connected to the water heater.
A malfunction may occur if two or more remote controllers are connected.
Remote controller RC-7651M
* The water heater has been factory set to allow a maximum temperature setting of [120 °F / 50 °C].
To access higher temperature settings through the remote controller, follow the below steps.
<When setting the maximum temperature to [125 -140 °F / 55 - 60 °C]>
1. Turn the water heater o󰀨 by pressing the Power On/O󰀨 Button on the remote controller.
2.
Press and hold the FLOW METER ALARM SET Button until a sound is heard (2 sec.) and [120 °F / 50 °C]
appears on the display.
3. Set the upper limit of the hot-water supply temperature to [125 °F, 130 °F, 135 °F or 140 °F / 55 °C or 60 °C]
using the UP and DOWN setting Buttons.
4. To put the water heater back into operation, press the Power On/O󰀨 Button on the remote controller.
To keep the water heater o󰀨, let the unit sit for 30 sec. to return to the original display.
• This unit can be programmed so that it will default to one of four temperatures if the remote controller
is removed [140 °F (60 °C), 130 °F (54 °C), 125 °F (52 °C), 120 °F (50 °C)]. To change the default
temperature, adjust the dip switches as described below. The default temperature is 120 °F (50 °C).
1. Disconnect electrical power to the water heater.
2. Remove the front cover of the water heater (4 screws).
3. Disconnect the remote controller. Adjust the dip switches as illustrated below.
4. Replace the front cover of the water heater (4 screws).
5. Reconnect electrical power to the water heater.
• When changing the temperature, make sure to conrm with the customer that the temperature of
the hot water will be very high and that there is a risk of scalding.
• Hot water heater temperatures over 125 °F (52 °C) can cause severe burns instantly or death
from scalding.
DANGER
* Remarks [125 °F / 55 °C]
Fahrenheit display mode
Celsius display mode
* Do not change any other DIP switches.
* High temperature
.
12
ON=
OFF=
120 F (50 C)
130 F (54 C)
125 F (52 C)
140 F (60 C)
Check
Check