Noritz proTOUGH NR981-DVC Installation Manual Download Page 1

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 

fi

re or explosion may result 

causing property damage, personal injury or death.

NORITZ AMERICA 
CORPORATION

 Installation Manual

TANKLESS GAS WATER HEATER

NR981-DVC

 (Indoor 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

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, 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 

fi

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

SBA8871-2

Rev. 03/13

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

fi

cations of its products without notice.

Low NOx 

Approved by 

SCAQMD

14 ng/J or 20 ppm

(Natural Gas Only)

CERTIFIED

R

*SBA8871*

Summary of Contents for proTOUGH NR981-DVC

Page 1: ...low 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 please either place this Installation Manual in a plastic pouch and attach it to the side of the water heater o...

Page 2: ...on Manual this document Part No Description 4 CVP 4STR 12 CVP 12STR 24 CVP 24STR 36 CVP 36STR Adjustable Part No Description CVT S Flange Adapter HorizontalTermination Flange Elbow Part No Description CRCAI 1 90 Elbow Adjustable 90 Elbow Support Strap CVP 45ELB CSCR 1 Standard Horizontal Kit FP 5 OUT Roof Flashing 0 45 Straight Straight Termination 11 CVP 11ADJ 16 CVP 16ADJ 40 CVP 40ADJ Rain Cap w...

Page 3: ...el connector from the other unit Note Connect the operation panel 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 exces sively cold temperatures Leave enough clearance around the plumbing to apply insulation It will be necessary ...

Page 4: ...er 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 ...

Page 5: ...esult 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 recreational vehicle or on a boat The water heater is designed for indoor installation only Never install it outdoors or in a bathroom it may be damaged ...

Page 6: ...nal noises while it is running Before installing make sure that the exhaust flue termination will have the proper clearances according to the National Fuel Gas Code ANSI Z223 1 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 re quest instructions Be su...

Page 7: ...in the following clearances from both combustible and non combustible materials Check Illustration If possible leave 8 200mm or more on either side of the unit to facilitate inspection If possible leave 24 600mm or more in front of the unit to facilitate maintenance and service if necessary If possible leave 3 75mm or more above and below the vent pipe to facilitate inspection and repair if necess...

Page 8: ...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 Nation...

Page 9: ... is not suffi 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 inflict injury Be careful not...

Page 10: ...n or enclosure Blocked terminals can cause abnor mal combustion resulting in undesired performance from the water heater 8 Vent Pipe Installation This appliance requires the use of special concentric type vent pipe specified by Noritz America Do not attempt to use materials that are not specified for use on this appliance WARNING Be sure to do CARBON MONOXIDE POISONING Follow all vent system requi...

Page 11: ...ngth Example 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 operation panel 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 21 for the location of the dip switch bank 3 6 12 1 18 21 24 2 30 32 3 38 41 0 0 1 80 2 0 3 ...

Page 12: ...s condensed water according to local codes and in order to prevent injury or property damage If this product will be installed in an area where snow is known to accumulate protect the vent termination from blockage by snow drifts or damage from snow falling off of roofs Support the vent pipe with hangers at a mini mum of every 7 2 1m Make the vertical pipe as short as possible Do not common vent o...

Page 13: ...ke of any appliance and 3 0 9m from any other building opening gas utility me ter service regulator etc Enclose exterior vent systems below the roof line to limit condensation and protect against mechanical failure When the vent penetrates a floor or ceiling and is not running in a fire rated shaft a firestop and support is required When the vent termination is located not less than 8 2 4m from a ...

Page 14: ...he ational uel as Code S 223 1 atural as eter See ne t a e for the i e ca acit charts orit an less as Water Heater 1 00 tuh Clothes Dr er 3 000 tuh ar ecue 0 000 tuh as an e Stove 6 000 tuh 10 3m 10 3m 10 3m 10 3m 1 m 1 m 1 m 1 m as ire lace 2 000 tuh Instructions 1 Si e each outlet ranch startin from the furthest usin the tuh re uired and the len th from the meter 2 Si e each section of the main ...

Page 15: ... 8 14 6 112 213 440 6 1260 a imum Ca acit of le rac i e in Cu ic eet er Hour of Natural Gas 0 60 S ecific ravit 0 WC ressure Dro en th in eet i e Si e 3 4 1 1 1 4 1 1 2 2 206 383 614 1261 2 34 14 26 418 888 20 8 121 218 334 23 16 8 10 188 284 62 14 2 4 168 2 1 131 86 1 3 22 0 1203 80 141 20 4 1 1114 132 1 4 440 1042 1 12 181 41 83 6 118 1 1 3 3 33 4 13 320 62 48 82 116 2 661 a imum Ca acit of le r...

Page 16: ...ma not e connected to an heatin s stem or com onents reviousl used ith a non ota le ater heatin a liance When ater is re uired in one art of the s stem at a hi her tem erature than in the rest of the s stem means such as a mi in valve shall e installed to tem er the ater to reduce the scald ha ard Installation and service must be performed by a qualified plumber In the Common ealth of assachusetts...

Page 17: ...eans to ensure that the su l ater ressure to the inlet of the heater does not fall elo 2 S hen the ma imum amount of ater is ein demanded lso install a ressure meter on the inlet f this is not done local oilin ill occur inside the ater heater causin a normal sounds and decreasin the dura ilit of the heat e chan er Freeze Prevention ree in is revented ithin the device automaticall unless the outsid...

Page 18: ...ment Re uired nstall orit solation Valves to allow for flushing lushing is re uired if a water treatment device is not installed Suggested Suggested nstall orit solation Valves to allow for flushing lushing is re uired if a water treatment device is not installed Residential Use Treatment Guidelines Commercial Use Treatment Guidelines R T Tankless Gas ater eater f this ater heater ill e installed ...

Page 19: ...uastat to 10 5 C below the set output temperature 4 orit recommends the use of an solation it with the installation These kits include an integrated shut off and service valve with unions and a pressure relief valve otes 1 orit recommends the use of an solation it with the installation These kits include an integrated shut off and service valve with unions and a pressure relief valve 2 Si e the pu...

Page 20: ... ill not activate resultin in ossi le free in dama e Do not let the o er cord contact the as i in ie the redundant o er cord outside the ater heater uttin the redundant len th of cord inside the ater heater ma cause electrical interference and fault o eration Disconnect o er lectrical Shoc Ha ard Do not turn power on until electrical wiring is finished Disconnect power before servicing Failure to ...

Page 21: ...heater off let the unit sit for 30 sec to return to the ori inal dis la his unit can e ro rammed so that it ill default to one of three tem eratures if the o eration anel is removed 140 F 60 C 135 F 57 C 120 F 50 C To change the default temperature adjust the di s itches as descri ed elo he default tem erature is 120 0 C 1 Disconnect electrical o er to the ater heater 2 emove the front cover of th...

Page 22: ...re 1 urn the ater heater off ressin the o er n ff utton on the o eration anel 2 Disconnect then reconnect electrical o er to the ater heater 3 ress the lo eter larm Set utton and hold it in for 2 seconds or more 4 ress the lo eter larm Set utton until the o eration anel dis la s item num er 12 ress Settin utton for seconds or more to chan e the dis la units to 6 ress Settin utton for seconds or mo...

Page 23: ... directl from a all circuit to the um e lace the front cover Pump Wiring his feature is not availa le hen usin the uic Connect ulti S stem feature Relay connection with larger pumps 85 W 1 ocate and re are the um control ires as descri ed a ove 2 Choose a suita le installation location for the rela here it ill e rotected from moisture 3 Connect the um control ires from the heater to the si nal in ...

Page 24: ...ont cover Wirin hrou h a Cou lin Cord Clam round ire Connector Connector Connecting Quick Connect Cord 2 Caution or uic Connect ulti S stem nstallation use art C 2 onl sold se aratel uic Connect Cord 2 uic Connect Cord 2 ta 1 ed 2 lac 3 White 4 reen lue 6 lue 1 ed 2 lac 3 White 4 reen lue 6 lue 1 ed 2 lac 3 White 4 reen lue 6 lue 1 White 2 reen 3 ed 4 lac lue 6 lue he ire colorin on the uic Connec...

Page 25: ...iodically 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 he ressure relief valve must e o erated once a ear to ensure that it is functionin ro erl and there is no o struction urn the o er o...

Page 26: ...o er to the unit 8 he unit ill no o erate henever hot ater is called for f the unit ill not o erate follo the shutdo n instructions and call a service technician Shutdown Instructions 1 Sto an ater demand 2 urn off electric o er 3 urn the as control manual valve cloc ise to the off osition Should overheatin occur or the as su l fail to shut off turn off the manual control valve to the a liance Han...

Page 27: ... 8 10mm 45mm G T C TT GS R M TT M C S G S T C D T R T T T R UT T R 81 DVC 2 0 5 1 mm 1 4 mm 2 8 70mm 100mm 5 5 140mm 1 0 2 mm 24 2 mm 22 5 7mm 2 00mm 4 4 11 mm 4 0 102mm 4 8 120mm 11 0 280mm 11 28mm 5 0 127mm 1 7 mm 1 2 mm 1 8 50mm 1 1 4mm C D S T DR R T U C R inch mm 7 2 184mm 4 125mm 7 8 1 mm 1 7 mm 5 241mm T T R UT T 4 7 4 188mm 10 2 2mm C D T R T 4 G S T 4 R G T R UG C120V 1 8 45mm 2 2 55mm 2 ...

Page 28: ...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 insta...

Page 29: ... List The value in indicates the quantity emote 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 use...

Page 30: ... 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 Cl...

Page 31: ...l wires ant the Y shaped terminals two cord of remote controller cord 4 Wire the remote controller cord through the wiring throughway and connect them to the wiring inside the heater 5 Replace the front cover Connecting of Remote Controller Cord to Water Heater Crimping Terminal Wiring Throughway Remote controller cord Operation panel Wires peration panel connector ...

Page 32: ... Press the ENTER Button the Misc settings screen appears on the display 4 Select Max set Temp using the Buttons 5 Press the ENTER Button 120 F 50 C appears on the display 6 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 Buttons 7 Press the ENTER Button Set complete appears on the display and then returns to the Misc settings screen 8 To...

Page 33: ...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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