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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

NR981-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

SBA8869-2

Rev. 03/13

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

ll in all of the required

items on the warranty and to hand the warranty to the customer along with the Owner's Guide.

CAUTION

FOR USE IN RESIDENTIAL 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 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 speci

cations of its products without notice.

CERTIFIED

*SBA8869*

Low NOx

Approved by

SCAQMD

14 ng/J or 20 ppm

(Natural Gas Only)

Summary of Contents for NR981-OD

Page 1: ...ual 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 o...

Page 2: ...ries 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 Shape Part Part 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 RC 7651M only Owner s Guide Warranty Insta...

Page 3: ...water temperature will become unstable as the pipe length increases Quick Connect cord Union Gas Valve Union Shutoff Valve Shutoff Valve Hot Water Cold Water 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 Pressure Relief Valve Shutoff Valve Size the piping to allow for the maximum flow rates ...

Page 4: ...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 Locate the appliance in an area where leakage from the unit or connections will not ...

Page 5: ...o 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 flow will not be affected by...

Page 6: ...of 24 600mm or more in front of the unit to facilitate inspection and repair Do install the unit such as the wall of the second floor where the unit is out of reach 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 floor Handrail common side corridor balcony et...

Page 7: ... 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 p...

Page 8: ...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 inflict 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 Locati...

Page 9: ...I Z223 1 Natural Gas Meter See next page for the pipe capacity charts Noritz Tankless Gas Water Heater 199 900 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 Instructions 1 Size each outlet branch starting from the furthest using the Btuh required and the length from the met...

Page 10: ... 787 1496 55 112 213 440 675 1260 Maximum Capacity of Flex TracPipe in Cubic Feet per Hour of Natural Gas 0 60 Specific Gravity 0 5 WC Pressure Drop Length in Feet Pipe Size 3 4 1 1 1 4 1 1 2 2 206 383 614 1261 2934 147 269 418 888 2078 121 218 334 723 1698 105 188 284 625 1472 94 168 251 559 1317 86 153 227 509 1203 80 141 209 471 1114 75 132 194 440 1042 71 125 181 415 983 67 118 171 393 933 55 ...

Page 11: ...t 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 qualified plumber In the Commonwealth of Mas...

Page 12: ...er 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 durabi...

Page 13: ...ent Required Treatment Required Treatment Required Install Noritz Isolation Valves to allow for flushing Flushing is required if a water treatment device is not installed Suggested Suggested Install Noritz Isolation Valves to allow for flushing Flushing is required if a water treatment device is not installed Residential Use Treatment Guidelines Commercial Use Treatment Guidelines Water Treatment ...

Page 14: ...stat if the water heater is not controlling the pump Set the Aquastat to 10 F 5 C below the set output temperature 4 Noritz recommends the use of an Isolation Kit with the installation These kits include an integrated shut off and 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 o...

Page 15: ...ply required by the water heater is 120VAC at 60 Hz The power consumption may be up to 228W 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 Do not let the power cord contact the gas piping Tie the redundant pow...

Page 16: ...ration press the Power On Off Button on the remote controller To keep the water heater off let the unit sit for 30 sec to return to the original display This unit can be programmed so that it will default to one of three temperatures if the remote controller is removed 140 F 60 C 135 F 57 C 120 F 50 C To change the default temperature adjust the dip switches as described below The default temperat...

Page 17: ... 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 Changing Other Features Adjusting the Temperature Display Note The setting must be done within the first 10 minutes of connectin...

Page 18: ...om a wall circuit to the pump 5 Replace the front cover Pump Wiring This feature is not available when using the Quick Connect Multi System feature 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 ...

Page 19: ...amp Ground wire Connector Use one of the vacant holes Connector Connecting Quick Connect Cord 2 Caution For Quick Connect Multi System Installation use part QC 2 only sold separately Quick Connect Cord 2 Quick Connect Cord 2 tag A B 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 Red 2 Black 3 White 4 Green 5 Blue 6 Blue 1 White 2 Green 3 Red 4 Black 5 Blu...

Page 20: ...or 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...

Page 21: ...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 val...

Page 22: ...OBLONG HOLE NR981 OD 1 8 45mm 2 2 55mm 2 2 56mm GAS INLET COLD WATER INLET HOT WATER OUTLET AIR INLET AIR INLET WIRING THROUGHWAY WATER DRAIN VALVE WATER FILTER HOT WATER OUTLET WATER DRAIN VALVE WIRING THROUGHWAY AC120V GAS INLET COLD WATER INLET FLUE COLLAR 2 4 61mm 2 4 60mm 5 7 146mm 10 3 262mm 1 4 36mm 13 8 350mm 13 2 336mm 13 1 334mm 9 9 252mm VIEW FROM TOP inch mm HOT WATER OUTLET 3 4 WIRING...

Page 23: ...es on the Installation Location The remote should be installed in an easily accessible location Avoid installing in a place where water or steam can come into contact with the controller Avoid locations where special chemical agents e g benzene fatty and oily deter gents are used Avoid outdoor installation or installation in an indoor location where it will be exposed to direct sunlight Connection...

Page 24: ...cord Phillips Roundhead Wood Screw Wall Anchor 3 Remove the cover of the remote control mark the location of the screw holes and drill holes for the wall anchors 4 Insert the wall anchors screw the remote control to the wall and replace the cover Remote Controller Cord Wall Packing take off the paper Remote Control Wires Rear Side of Remote Controller ...

Page 25: ...the wall pipe containing the remote controller wires through the hole 4 Slide the junction box packing and the junction box over the remote controller wires and wall pipe protruding from the outside wall Wall packing Wall pipe Take out the pipe about 3 4 from the wall Junction Box Box Nut Junction Box Packing Take off the paper 5 Slide the box nut over the remote controller wires and screw it onto...

Page 26: ...er In order to use this product safely read this installation manual carefully and follow the installation instructions Potential dangers from accidents during installation and use are described below Closely observe these warnings they are critical to your safety The remote controller is not water resistant Keep it dry CAUTION Do not connect power to the system unit until the remote controller in...

Page 27: ...t The value in indicates the quantity Remote Controller Mounting bracket Raised countersunk head wood screw Wall anchor Raised countersunk head screw For junction box installation Machine screw When attaching to a junction box Use the raised countersunk head screws to attach the mounting bracket to the junction box In this case the wall anchor and raised countersunk head wood screws are not used T...

Page 28: ...of the remote controller and the frame pull the entire decorative frame forward while pressing the sections indicated where the fingers are in the figure below If it does not come off insert a flat head driver into the notch at the bottom of the decorative frame and slightly twist it to remove due caution is required not to scratch the remote controller decorative frame or the wall in doing so Cli...

Page 29: ... 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 off by pressing the Power On Off Button on the remote controller 2 Press the MENU Button inside the remote cover select Misc settings using the Buttons 3 Press the ENTER Button the Misc settings screen appears on the di...

Page 30: ...te controller 2 Disconnect then reconnect electrical power to the water heater 3 Press the MENU Button inside the cover select Initial settings using the Buttons 4 Press the ENTER button the Initial settings screen appears on the display 5 Select F gal C L using the Buttons 6 Press the ENTER Button and select either F gal or C L using the Buttons 7 Press the ENTER Button Set complete Please wait a...

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