Noritz ecoTOUGH NRC661A-OD 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
CONDENSING TANKLESS GAS WATER HEATER
NRC711-OD (Outdoor Installation)
NRC661A-OD (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
SBB8068-4
Rev. 11/20
Requests to Installers
• In order to use the water heater safely, read this installation manual carefully, and follow the in-
stallation 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
Low NOx Approved by SCAQMD
14 ng/J or 20 ppm
(Natural Gas Only)
*SBB8068*
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.
When applicable, installation must conform with the Manufactured
Home Construction and Safety Standard, Title 24 CFR, Part 3280.
Noritz America reserves the right to discontinue, or change at any
time, the designs and/or specications of its products without notice.

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. 21) Remote Controller
Cord (10ft (3m))
1
2.
Optional Accessories
The accessories listed below are not
included with the units, but may be necessary
for installation.
Cross Recessed
Head Screw
Q’ty
ShapePartPart Shape Q’ty
1
Remote Controller
Cord (26ft (8m))
1
Isolation Valves*
(includes pressure
relief valve)
Pipe Cover
(PC-1S) 1
1
Recess Box
(RB-510)
1
Remote Controller
Outdoor
Junction Box
Owner's Guide, Warranty,
Installation Manual
(this document)
1
Neutralizer
(NC-1)
* Isolation valves are necessary for ushing the Heat Exchanger.
They allow for easy ushing of the system.

3
Check the Gas
• Check that the rating plate indicates the correct type of gas.
• Check that the gas supply line is sized for
157,000 Btuh for NRC711-OD series.
(120,000 Btuh for NRC661A-OD series.)
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.
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.
3. 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
4. Choosing Installation Site
* Locate the appliance in an area where leakage from the unit or connections will not result in damage
to the area adjacent to the appliance or to the lower oors of the structure. When such 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.
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.

4
• 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 affected by
fans or range hoods.
• Take care that noise and exhaust gas will not affect neighbors.
Avoid installation on common walls as the unit will make some
operational noises while it is running.
• 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).
• 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.

5
5. 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.
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
▲The illustration is an example. Please check with the actual water heater about the position of piping, and form.