Noritz Field Manual - 2009

1

NORITZ America CorporationGas Water Heater

Field ManualThe materials in this manual are presented for referenceonly. For further assistance, contact Noritz TechnicalSupport at 866-766-7489.

be changed without prior notice.

Do not short circuit any safetydevice on this appliance

Rev: Jan, 2009

Contents

Important Safety Information .........................................................................................................................................

1. Features ...........................................................................................................................................................................

.....................................................................................................................................

3. Dimensions ....................................................................................................................................................................

4. Components .................................................................................................................................................................5. Troubleshooting ..........................................................................................................................................................

Error Codes and Checkpoints ............................................................................................................................

Remote Controller .................................................................................................................................................

Displaying Maintenance Monitor ....................................................................................................................Maintenance Monitor List ...................................................................................................................................

Gas Line Requirements ........................................................................................................................................Periodic Inspection ................................................................................................................................................Periodic Maintenance ..........................................................................................................................................Changing Default Temperature Setting ........................................................................................... ..............

6. Installation Check .......................................................................................................................................................

2.

2

35

20

2944

4446

4647

50525255

58

N-0531S (-OD)N-0631S (-OD)N-0751M (-DV, -OD, -DVC)N-0931M (-DV, -OD)N-0841MC (-DV)N-1321M-ASME

Neutralizer Life Cycle Warning/Replacement Procedures....................................................................... 48

Draining Water for Maintenance or Freeze Protection ............................................................................ 57

2

Important Safety InformationTo prevent damage to property and injury to the user, the icons below warn ofvarying levels of risk.

Caution

Warning Ignoring this indication will cause an immediate danger of death orserious injury.

Ignoring this indication may result in death or serious injury.

Prohibited.

1. Safety Tips for ServiceW ear the appropriate clothing and protective gear:

In order to prevent injury or accident, wear a protective helmet, safety boots and a liftingbelt whenever necessary.Caution

Use only the appropriate tools and parts:

WarningOnly use replacement parts manufactured by Noritz for this model as listed in theInstallation Manual Parts List for service on this unit. Use appropriate tools.

When servicing:

WarningDisconnect the power supply during maintenance and repairs to reduce the risk ofelectric shock. If it is necessary to have the electricity connected during repairs, useextreme caution not to touch parts that may cause a shock.

Do not short circuit any safety device on this appliance:

If a safety device is not functioning properly, replace the part. Do not under anycircumstances short circuit the part.

Exhaust and gas leakage caution:

WarningAlways check for leaks when installing or modifying the exhaust vent or gas piping.

2. Post-Service ChecksCheck parts for leaks:

CautionIf the unit is installed indoors, check that the flue collar and vent pipe are installedcorrectly and that they are in good condition. Confirm that there are no gas, water, or exhaust leaks regardless of whether the service performed could have caused them.

Check for combustibles:

CautionAfter service or maintenance is completed, check that there are no combustibles inthe vicinity of the unit.

Check insulation resistance:

WarningAfter service or maintenance is completed, measure the resistance between the elec-trical wires and ground. If it is less than 10M , there is a risk of electrical shock.

Properly reconnect the power supply:

Warning

Do not attempt to modify or alter the unit. This will cause a fire hazard and a risk ofelectrical shock.

Confirm that there are no gas, water, or exhaust leaks regardless of whether theservice performed could have caused them.

Confirm that the power supply has been reconnected properly after service or main-tenance is completed. Also confirm that there is no dust or other obstacles that mightcause an electric shock or a fire hazard.

Modification of the unit is prohibited:

3

1. Features

1. Quick Connect Multi System (For N-0751M series, N-0931M series, N-0841MC series, and N-1321M-ASME only)Allows the simple installation of up to 2 units linked together using a Quick Connect Cord

CCP ValveSystem Controller

2. Secondary Recirculation Pump in a Multi-System (For N-0931M series, N-0841MC series, and N-1321M-ASME only)T wo recirculation pumps can be connected to the multi-system controller to provide a rotational pump system.The multi-system controller will rotate the run time of each pump to increase pump life and also provide a backupshould one pump fail.

3. Multi-System Rotation Timing (For N-0931M series, N-0841MC series, and N-1321M-ASME only)(1) In a multi-system installation, the system controller rotates the primary unit every 8 hours of accumulated

combustion time.

of up to 16 hours).(3) Rotation is made every 24 hours, regardless of the burn, to ensure even wear.

4. Maximum Remote Controller Length (Only one remote controller can be connected.)Remote controller (1 unit): Cord can be extended up to 300' with 18AWG wire.

* Note: In a Quick Connect Multi-System, only one remote controller will be installed. (For N-0751M series, N-0931M series, N-0841MC series, and N-1321M-ASME only)

5. Temperature Lockout Function

The remote controller can be set to restrict the maximum allowable temperature setting for added safety.See page 55-56 for details.

6. Elevation Adjustment

of the unit. No additional equipment or adjustments are necessary. See the "Installation Manual" for details.

Not required

4

Cold w

ater

Cold w

ater

Gas

Gas

Hot w

ater

Hot w

ater

Condensate

Combustion gasAbout 400 °F

About 400°FtsuahxEtsuahxE

About 120°F

Conventional type

Condensing Tankless Gas Water Heater

Water is heated using the exhaustgas which is about 400 °F.

Primary heat exchanger

Primary heat exchanger

Secondary heat exchanger

Neutralizer

Combustion gasAbout 400 °F

The condensing tankless gas water heaterdischarges condensate.When heat from the exhaust gas is collected within thesecondary heat exchanger, condensation occurs frommoisture in the exhaust gas and the resulting water isdischarged from the drain pipe (approx. 2 gallons/hour(GPH) maximum). It is not a water leak. Do not plug orblock the drain line as it must always be allowed to freely

Drain pipe(Installation example)

The condensing tankless gas water heatertends to show white steam.

After the exhaust gas passes through the secondary heatexchanger, it becomes low in temperature and moisturerich which tends to produce steam at the vent dischargeterminal. This is a normal occurrence.

Condensatecomes outfrom here.

During combustion, whitesteam may often be seen.This is normal.

Overview of Condensing Tankless Gas Water HeaterThis water heater is a high efficiency, fully condensing appliance. Unlike a traditional tankless water heater, acondensing type captures heat from the exhaust gas and uses it to preheat the incoming cold water as it passesthrough the secondary heat exchanger as illustrated below.

5

N-0531SIndoor/ Outdoor, Wall Mounted

Direct Ignition15-150 psi0.5 GPM

20.5"(Height) x 13.8"(Width) x 6.7"(Depth)

36 lbs.0.2 Gallon

3/4"3/4"3/4"

120 VAC (60Hz) NG : 54W LP : 59W Freeze Prevention 141W

Stainless SteelCopper Sheeting, Copper Tubing

Flame Rod, Thermal Fuse, Lightning ProtectionDevice (ZNR), Overheat Prevention Device,

Freezing Prevention Device, Fan Rotation Detector

ItemModel Name

Type

IgnitionOperating PressureMinimum Flow RateDimensionsWeightWater Holding Capacity

Accessories

InstallationAir Supply/Exhaust

Connection Sizes

Power Supply

Materials

Water InletHot Water OutletGas InletSupplyConsumption

CasingFlue CollarHeat Exchanger

Safety Devices

N-0531S-OD

NG : 51W LP : 52W Freeze Prevention 141W

Anchoring Screws

Outdoor, Wall Mounted

N-0531S (-OD)

ItemGas Consumption

Maximum Hot Water CapacityCapacity Range

Temperature Settings(Using the remote controller)

Default Temperature Options

NG : 140,000 btuh, LP : 140,000 btuh

45°F Rise

100-150°F (In 5°F intervals), 160°F (12 Options)

Maximum PerformanceMinimum Performance

Performance

NG : 20,000 btuh, LP : 20,000 btuh5.3 Gal./min.0.5-6.6 Gal./min.120, 130, 140°F (Original is 120°F)

N-0531S N-0531S-OD

Po wer Vented

6

N-0631SIndoor/ Outdoor, Wall Mounted

Direct Ignition15-150 psi0.5 GPM


41 lbs.0.2 Gallon

3/4"3/4"3/4"



Flame Rod, Thermal Fuse, Lightning ProtectionDevice (ZNR), Overheat Prevention Device, Freezing

Prevention Device, Fan Rotation Detector

ItemModel Name

Type


Accessories


Connection Sizes

Power Supply

Materials



Safety Devices

N-0631S-OD


Anchoring Screws

ItemGas Consumption

Maximum Hot Water CapacityCapacity Range

Temperature Settings(Using the remote controller)


NG : 180,000 btuh, LP : 180,000 btuh

45°F Rise

100-150°F (In 5°F intervals), 160°F (12 Options)

Maximum PerformanceMinimum Performance

Performance

NG : 25,000 btuh, LP : 25,000 btuh6.3 Gal./min.0.5-7.1 Gal./min.120, 130, 140°F (Original is 120°F)

N-0631S N-0631S-OD

Outdoor, Wall Mounted

N-0631S (-OD)

Po wer Vented

7

N-0751MIndoor/ Outdoor, Wall Mounted

Po wer VentedDirect Ignition

15-150 psi0.5 GPM


47 lbs.0.2 Gallon

3/4"3/4"3/4"





Remote Controller, Remote Controller Cord,Anchoring Screws

Performance

ItemModel Name

Type


Accessories


Connection Sizes

Power Supply

Materials



Safety Devices

ItemGasConsumption

Maximum Hot Water CapacityCapacity RangeTemperature Settings


NGLP

45°F Rise 7.5 Gal./min.0.5-9.8 Gal./min.

100-150°F (In 5°F intervals),160, 170, 180°F (In 10°F intervals) (14 Options)

120,130,140,180°F (Original is 120°F)

Maximum Performance199,900 btuh199,900 btuh

Minimum Performance12,000 btuh12,000 btuh

N-0751M

8

N-0751M-DV

N-0751M-DVIndoor, Wall Mounted


15-150 psi0.5 GPM


54 lbs.0.2 Gallon

3/4"3/4"3/4"

120 VAC (60Hz)






Performance

ItemModel Name

Type


Accessories


Connection Sizes

Power Supply

Materials



Safety Devices

ItemGasConsumption

Maximum Hot Water Capacity

Capacity RangeTemperature Settings


NGLP45°F Rise 7.5 Gal./min.

0.5-9.8 Gal./min.100-150°F (In 5°F intervals),

160, 170, 180°F (In 10°F intervals) (14 Options)

120,130,140,180°F (Original is 120°F)



9

Specification

N-0751M-ODOutdoor, Wall Mounted

Power VentedDirect Ignition

15-150 psi

0.5 GPM23.6"(Height) x 13.8"(Width) x 9.4"(Depth)

47 lbs.0.2 Gallon

3/4"3/4"3/4"

120 VAC (60Hz)

NG : 64W LP : 77W Freeze Prevention 145WZincified Steel Plate/Polyester Coating





Performance

ItemModel Name

Type


Accessories


Connection Sizes

Power Supply

Materials



Safety Devices

ItemGasConsumption



NGLP

45°F Rise 7.5 Gal./min.0.5-9.8 Gal./min.


120,130,140,180°F (Original is 120°F)



N-0751M-OD

10

Specification

N-0751M-DVCIndoor, Wall Mounted


15-150 psi0.5 GPM


55 lbs.0.2 Gallon

3/4"3/4"3/4"


Zincified Steel Plate/Polyester CoatingStainless Steel

Copper Sheeting, Copper Tubing

Flame Rod, Thermal Fuse, Lightning ProtectionDevice (ZNR), Electric Leakage Prevention Device

(GFCI), Overheat Prevention Device, FreezingPrevention Device, Fan Rotation Detector

Anchoring Screws

Performance

ItemModel Name

Type


Accessories


Connection Sizes

Po wer Supply

Materials



Safety Devices

ItemGasConsumption

Maximum Hot Water Capacity

Capacity RangeTemperature Settings


NGLP

.nim/.laG 5.7esiR F°54



120,130,140,180°F (Original is 120°F)



N-0751M-DVC

11

N-0931M

N-0931M

Indoor/ Outdoor, Wall MountedPower VentedDirect Ignition

15-150 psi0.5 GPM


62 lbs.0.3 Gallon

3/4"3/4"3/4"

120 VAC (60Hz)



Flame Rod, Thermal Fuse, Pressure Relief Valve,Lightning Protection Device (ZNR), Overheat

Prevention Device, Freezing Prevention Device,Fan Rotation Detector


Performance

ItemModel Name

Type


Accessories


Connection Sizes

Power Supply

Materials



Safety Devices

ItemGasConsumption



NGLP




120,130,140,180°F (Original is 120°F)



12

N-0931M-DV

N-0931M-DVIndoor Wall Mounted


15-150 psi0.5 GPM


62 lbs.0.3 Gallon

3/4"3/4"3/4"

120 VAC (60Hz)




Performance

ItemModel Name

Type


Accessories


Connection Sizes

Power Supply

Materials



Safety Devices

ItemGasConsumption



NGLP

.nim/.laG 3.9esiR F°540.5-11.1 Gal./min.


120,130,140,180°F (Original is 120°F)





13

N-0931M-OD

N-0931M-OD

Outdoor, Wall MountedPo wer VentedDirect Ignition

15-150 psi0.5 GPM


62 lbs.0.3 Gallon

3/4"3/4"3/4"






Performance

ItemModel Name

Type


Accessories


Connection Sizes

Power Supply

Materials



Safety Devices

ItemGasConsumption



NGLP




120,130,140,180°F (Original is 120°F)



14

N-0841MC

Power VentedDirect Ignition

15-150 psi0.5 GPM


73 lbs.0.5 GallonNPT 3/4"NPT 3/4"NPT 3/4"


Stainless SteelStainless Steel

Copper Sheeting, Copper Tubing

Flame Rod, Thermal Fuse, Pressure Relief Valve,Lightning Protection Device (ZNR),

Overheat Prevention Device, Freezing Prevention Device,Fan Rotation Detector


Performance

ItemModel Name

Type


Accessories


Connection Sizes

Power Supply

Materials

Water InletHot Water OutletGas Inlet

SupplyConsumption

CasingFlue CollarFirst Heat Exchanger

Safety Devices

Item

GasConsumption



NG

LP

.nim/.laG 4.8esiR F°540.5-11.1 Gal./min.


120,130,140,180°F (Original is 120°F)



1/2" ThreadedCondensate Drain

Stainless Steel Sheeting, Stainless Steel TubingSecondary Heat Exchanger

N-0841MC-DV

Indoor/ Outdoor, Wall Mounted Indoor, Wall Mounted


N-0841MC (-DV)

15

N-1321M-ASME

N-1321M-ASME

Indoor/ Outdoor, Wall MountedPower VentedDirect Ignition

15-150 psi0.7 GPM


105 lbs.0.6 Gallon

1"1"

3/4"120 VAC (60Hz)






Performance

ItemModel Name

Type


Accessories


Connection Sizes

Power Supply

Materials



Safety Devices

ItemGasConsumption



NGLP

13.2 Gal./min. esiR F°54



120,130,140,180°F (Original is 120°F)



Stainless Steel

16

F 46 .pmet retaw telnI ]llaF/gnirpS[F 64 .pmet retaw telnI ]retniW[ [Summer] Inlet water temp. 82 F

800 1 2 3 4 5 6 7 8 9 10 11 12

90

100

110

120

130

140

150

160

170

180

Set t

empe

ratu

re (

F)

Flow Rate (GPM)

800 1 2 3 4 5 6 7 8 9 10 11 12

90

100

110

120

130

140

150

160

170

180

Set t

empe

ratu

re (

F)

Flow Rate (GPM)

800 1 2 3 4 5 6 7 8 9 10 11

90

100

110

120

130

140

150

160

170

180

Set t

empe

ratu

re (

F)

Flow Rate (GPM)

Hot Water Supply CapabillitiesH

ot W

ater

Tem

per

atur

e ( F

)

Hot Water Flow Rate (gal/min)

[Winter] Inlet water temp. 46 F [Spring/Fall] Inlet water temp. 64 F [Summer] Inlet water temp. 82 F

800 1 2 3 4 5 6 7 8 9 10

90

100

110

120

130

140

150

160

170

180H

ot W

ater

Tem

per

atur

e ( F

)


Hot

Wat

er T

emp

erat

ure

( F)


800 1 2 3 4 5 6 7 8 9 10

90

100

110

120

130

140

150

160

170

180

800 1 2 3 4 5 6 7 8 9 10

90

100

110

120

130

140

150

160

170

180

N-0751M (-DV, -OD, -DVC)

N-0631S (-OD)


800 1 2 3 4 5 6 7 8 9 10 11 12

90

100

110

120

130

140

150

160

170

180

Set t

empe

ratu

re (

F)

Flow Rate (GPM)

800 1 2 3 4 5 6 7 8 9 10 11 12

90

100

110

120

130

140

150

160

170

180

Set t

empe

ratu

re (

F)

Flow Rate (GPM)

800 1 2 3 4 5 6 7 8 9 10 11

90

100

110

120

130

140

150

160

170

180

Set t

empe

ratu

re (

F)

Flow Rate (GPM)

N-0931M (-DV, -OD)

N-0531S (-OD)F 46 .pmet retaw telnI ]llaF/gnirpS[F 64 .pmet retaw telnI ]retniW[ [Summer] Inlet water temp. 82 F

Set t

empe

ratu

re (

F)

Set t

empe

ratu

re (

F)

Set t

empe

ratu

re (

F)

800 1 2 3 4 5 6 7 8

90

100

110

120

130

140

150

160

170

180

Flow Rate (GPM)

800 1 2 3 4 5 6 7 8

90

100

110

120

130

140

150

160

170

180

Flow Rate (GPM)

800 1 2 3 4 5 6 7 8

90

100

110

120

130

140

150

160

170

180

Flow Rate (GPM)


800 1 2 3 4 5 6 7 8 9 10 11 12

90

100

110

120

130

140

150

160

170

180

Set t

empe

ratu

re (

F)

Flow Rate (GPM)

800 1 2 3 4 5 6 7 8 9 10 11 12

90

100

110

120

130

140

150

160

170

180

Set t

empe

ratu

re (

F)

Flow Rate (GPM)

800 1 2 3 4 5 6 7 8 9 10 11

90

100

110

120

130

140

150

160

170

180

Set t

empe

ratu

re (

F)

Flow Rate (GPM)

N-0841MC (-DV)

17

Pressure Loss Characteristics N-0531S (-OD)

0

5

10

15

20

25

30

0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0

Pres

sure

Los

s (p

si)

0

10

20

30

40

50

60

Ft o

f Hea

d

Flow Rate (gpm)

N-0631S (-OD)

0

5

10

15

20

25

30

0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0

Pres

sure

Los

s (p

si)

0

10

20

30

40

50

60

Ft o

f Hea

dFlow Rate (gpm)


N-1321M-ASME

Flow Rate (GPM) Flow Rate (GPM) Flow Rate (GPM)

Set t

empe

ratu

re (

F)

Set t

empe

ratu

re (

F)

Set t

empe

ratu

re (

F)

18

Flow rates shown will vary slightly depending on the incoming water temperatureand the setting temperature on the remote controller.

0

5

10

15

20

25

30

0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0

Flow Rate (GPM)

Pres

sure

Los

s (p

si)

Ft o

f Hea

d

0.0

10.0

20.0

30.0

40.0

50.0

60.0Bypass ClosedSet temperature:145 F or higherBypass OpenSet temperature:140 F or less

N-0751M (-DV, -OD, -DVC)

Flow rates shown will vary slightly depending on the incoming water temperatureand the setting temperature on the remote controller.

N-0931M (-DV, -OD)

Bypass CloseSet temperature:145 F or higher(Storage Tank Setting w/SystemController : 170 -180 F)

0

5

10

15

20

25

30

30

35

45

55

0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0

Flow Rate (GPM)

Pres

sure

Los

s (p

si)

Ft o

f Hea

d

0.0

10.0

20.0

30.0

40.0

50.0

60.0

80.0

70.0

90.0

100.0

110.0

Bypass OpenSet temperature:140 F or less(Storage Tank Setting w/SystemController : 160 F or less)

19

Flow Rate (GPM)

Pres

sure

Los

s (p

si)

Ft o

f Hea

d

0

5

10

15

20

25

30

0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.00

10

20

30

40

50

60

Set temperature: 135°F or higher(Storage Tank Setting w/ SystemController: 170~180°F)

Set temperature: 130 °F or less(Storage Tank Setting w/ SystemController: 160 °F or less)

N-0841MC (-DV)

Set temperature: 145°F or higher (Storage Tank Setting w/ System Controller: 170~180°F)

Set temperature: 140°F or less (Storage Tank Setting w/ System Controller: 160°F or less)

Ft o

f Hea

d

Flow Rate (GPM)

Pres

sure

Los

s (p

si)

N-1321M-ASME

0

10

20

30

40

50

60

0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.00

5

10

15

20

25

30

20

3. Dimensions

N-0531S

N-0531S-OD

FLUE COLLAR

AIR INLET

AIR INLET

GAS INLET

COLD WATER INLET

WATER DRAIN VALVE

HOT WATER OUTLET

(WATER FILTER)WATER DRAIN VALVE

WIRING THROUGHWAYS

13.3"

3"13.1"13.8"

20.5

"0.4"

3.2"

19.2

"

0.4" 6.7"

3.0"

1.2"

0.4"

21.4

"

4.7"

2.4"

3.3"

0.4"

4.7"

COLD WATER INLET(3/4")

HOT WATER OUTLET(3/4")

7.0"4.3"

1.5"

3.8"

1.6"

GAS INLET (3/4")

10.0"

3.9"

7.2"

2.2"

WIRING THROUGHWAYS

1.8"

1.9"

2.0"

(VIEW FROM TOP)

UPPER WALL MOUNT BRACKETS

LOWER WALL MOUNT BRACKETS

BOTTOM OF CASEBOTTOM OF CASE

AIR INLET

AIR INLET

GAS INLET

COLD WATER INLET

WATER DRAIN VALVE

HOT WATER OUTLET

(WATER FILTER)WATER DRAIN VALVE

WIRING THROUGHWAYS

13.3"

13.1"

8.4"

13.8"

20.5

"

0.4"

19.2

"

0.4" 6.7"

1.2"

0.4"

21.4

"

4.7"

2.4"

3.3"

0.4"

4.7"



7.0"4.3"

1.5"

3.8"

1.6"

GAS INLET (3/4")

10.0"

3.9"

7.2"

2.2"

(VIEW FROM TOP)

WIRING THROUGHWAYS

1.8"

1.9"

2.0"

1.7"

1.0"

LOWER WALL MOUNT BRACKETS

UPPER WALL MOUNT BRACKETS

BOTTOM OF CASE BOTTOM OF CASE

21

N-0631S

4- 0.5"

2-0.3" x 0.5"OBLONG HOLE

4.7"

2.0"

3.3"

2.4"3.3"

4.7"

0.4"

24.5

"0.

4" 1.2" 3.

2"22

.3"

0.4"

0.4"3"

6.7"

1.1"

AIR INLET

WATER DRAIN VALVE(WATER FILTER)

HOT WATER OUTLET

WATER DRAIN VALVE

WIRING THROUGHWAYS

GAS INLET

COLD WATER INLET

23.6

"

13.8"13.1"

4"

FLUE COLLAR

AIR INLET

LED

13.3"

(VIEW FROM TOP)

10.5"7.8"6.2"1.4"

4.3"

2.5"

1.8" 1.9"

4.2"

1.7"

HEGHT OF EACH FITTINGSFROM BOTTOM OF CASE

HOT WATER OUTLET

COLD WATER INLET

GAS INLET

N-0631S

1.8"

1.9"

2.0"

4- 0.5"



COLD WATER INLET(3/4")GAS INLET (3/4")

WIRING THROUGHWAYS

N-0631S-OD

‚b‚n‚k‚c‚g‚n‚s ‚f‚`‚r

4- 0.5"


4.7"

2.0"

3.3"

2.4"

3.3"4.7"


0.4"

24.5

"0.

4" 1.2"

22.3

"

0.4"

0.4" 6.7"0.4"

1.1"

AIR INLET

(VIEW FROM TOP)

13.3"

13.8"

13.1"10.0" 1.6"

AIR INLET

LED

10.5"

4.3"

2.5"

1.8"

7.8"6.2"

1.4"1.

9"4.

2"

1.7"

1.0"

1.7"

23.6

"


HOT WATER OUTLET

WATER DRAIN VALVE

WIRING THROUGHWAYS

GAS INLET

COLD WATER INLET

HEGHT OF EACH FITTINGSFROM BOTTOM OF CASE

HOT WATER OUTLET

COLD WATER INLET

GAS INLET

N-0631S-OD

1.8"

1.9"

2.0"

FLUE TERMINAL

4- 0.5"



WIRING THROUGHWAYS

GAS INLET (3/4")

22

N-0751M

N-0751M-DV

< inch>

N-0751M

1.8"

2.2"

2.2"

13.8"

23.6

"

13.1"

AIR INLET

1.2"

3.7"

22.3

"

2.8"

0.4"

9.4"0.4"

1.1"

AIR INLET

13.2"

GAS INLET

3.3"

0.4"

24.5

"

4.7"

0.4"

2.4"

4.7"

2.0"3.3"

4- 0.5"2-0.3 x 0.5" OBLONG HOLE

10.3"7.1"

4.8"

2.8"

4.5"

5.9"

7.8"3.1"

1.4"

7.0"

GAS INLET (3/4")

4- 0.5"2-0.3 x 0.6" OBLONG HOLE

HEIGHT OF EACH FITTINGSFROM BOTTOM OF CASE

HOT WATER OUTLET

COLD WATER INLET

GAS INLET

WIRING THROUGHWAY


HOT WATER OUTLET

WATER DRAIN VALVE

COLD WATER INLET

(120VAC)

(120VAC)

WIRING THROUGHWAY

WIRING THROUGHWAY

COLD WATER INLET (3/4")WIRING THROUGHWAY

HOT WATER OUTLET (3/4")

(VIEW FROM TOP)

4" FLUE COLLAR

(120VAC)WIRING THROUGHWAY

WIRING THROUGHWAY

(VIEW FROM TOP)


COLD WATER INLET (3/4")

GAS INLET (3/4")

12.5"

2.1"

5.9"

5.4"

10.8"4.

8"

4.5"

9.4"3.7"

2.8"

26.2

"

6.7"5.5"3.9"2.8"1.4"

6.7"5.5"3.9"2.8"1.4"

17.7"


WIRING THROUGHWAY

COLD WATER INLET


HOT WATER OUTLET

WATER DRAIN VALVE

GAS INLET

1.1"

3"

0.4"

23.1

"

9.4"0.4"3.7"

1.6" FLUE COLLARAIR INLET

17.6"

9.1"5.9"

24.2

"

18.3"

2.2"GAS INLET

2.2"COLD WATER INLET

1.8"HOT WATER OUTLET

N-0751M-DV

< inch >


4- 0.5"6-0.24 x 0.4"OBLONG HOLE

4- 0.5"6-0.24 x 0.4" OBLONG HOLE

4"4"

23

N-0751M-OD

4- 0.5"2-0.3 x 0.5" OBLONG HOLE

4- 0.5"2-0.3 x 0.6" OBLONG HOLE

< inch >

N-0751M-OD

1.8"

2.2"

"2.2TELNI SAG

13.8"

23.6

"

1.7"

2.1"

8.6" 2.9"13.1"

AIR INLET

22.3

"

0.4"9.4"0.4"

1.2"

0.4"

1.1"

AIR INLET

0.4"

2.4"

4.7"3.3"

24.5

"

4.7"

0.4"

3.3"2.0"

13.2"

GAS INLET

2.8"

4.5"

7.1"

10.3"

4.8"

7.8"

5.9"

1.4"

3.1"

7.0"

GAS INLET (3/4")


HOT WATER OUTLET

COLD WATER INLET

FLUE COLLAR

WIRING THROUGHWAY


HOT WATER OUTLET

WATER DRAIN VALVE

WIRING THROUGHWAY(120VAC)

COLD WATER INLET

(VIEW FROM TOP)



WIRING THROUGHWAY


N-0751M-DVC


WIRING THROUGHWAYWIRING THROUGHWAYAC120V


GAS INLET (3/4")

(VIEW FROM TOP)

7.3"8.

1"7.3"

2.6"

1.2"

6.9"

10.3"

6.0"

5.9"4.1"

1.8"

0.5

0.5"

1.4"

0.2" x 0.4" OBLONG HOLE

0.2" x 0.4" OBLONG HOLE

5.5"4.1"2.8"1.4"

5.5"4.1"2.8"

0.8"

26.0

"

0.8" 2.9"

22.3

"

2.5"

4.1"

1.1"

10.2"0.4" - 1.8"

0.4" - 1.8"WIRING THROUGHWAY


HOT WATER OUTLET

WATER DRAIN VALVECOLD WATER INLET

GAS INLET

AC120VWIRING THROUGHWAY

13.2"

FLUE COLLAR

AIR INLET

5.0" 3.1"

13.1"

23.6

"

13.8"

2.2"GAS INLET



N-0751M-DVC

< inch >

FROM BOTTOM OF CASEHEIGHT OF EACH FITTINGS

24

N-0931M

N-0931M-DV

< inch >

N-0931M

1.7"

2.2"

"2.2TELNI SAG

18.3"

24.2

"

17.6"

AIR INLET

LED

17.7"

1.6"

0.4"

23.1

"

0.4" 9.4"

3.7"2.7"

1.1"

AIR INLET

5.5"

5.5"3.9"

3.9"

1.4"2.8"

6.7"

1.4"2.8"

6.7"

26.2

"

GAS INLET 2.6"

2.8"

6.9"

5.3"

5.4"

6.3"

11"

14.4"

7.7"

6.1"

3.9"

2.9"

GAS INLET (3/4")

4- 0.5"6-0.24 x 0.4" OBLONG HOLE

4- 0.5"6-0.24 x 0.4" OBLONG HOLE

FLUE COLLAR

WIRING THROUGHWAYS


HOT WATER OUTLET

WATER DRAIN VALVE WIRING THROUGHWAY(120VAC)

COLD WATER INLET


HOT WATER OUTLET

COLD WATER INLET

(VIEW FROM TOP) WIRING THOROUGHWAY(120VAC)

COLD WATER INLET (3/4")WIRING THOROUGHWAYS


4"

(120VAC)WIRING THOROUGHWAY

WIRING THOROUGHWAYS

(VIEW FROM TOP)


COLD WATER INLET (3/4")GAS INLET (3/4")

2.9"

6.1"

3.9"

7.7"

14.4"

11"

5.4"

6.9"

6.3"

5.3" 2.8

"

2.6"

6.7"5.5"3.9"2.8"1.4"

6.7"5.5"

3.9"2.8"1.4"

26.2

"

1.1"

3"

9.4"

3.7"

23.1

"

0.4"

0.4"

1.6"


WIRING THROUGHWAYS COLD WATER INLET


HOT WATER OUTLET

WATER DRAIN VALVE

GAS INLET

17.7"

AIR INLETFLUE COLLAR

LED

17.6"

5.9" 9.1"

24.2

"

18.3"

2.2"GAS INLET



N-0931M-DV

< inch >

FROM BOTTOM OF CASEHEIGHT OF EACH FITTINGS

4- 0.5"

6-0.24 x 0.4" OBLONG HOLE

4"4"

4- 0.5"6- 0.24 x 0.4" OBLONG HOLE

25

N-0931M- OD

< inch >

N-0931M-OD

1.7"

2.2"

"2.2TELNI SAG10.6" 3.2"

1.7"

2"

18.3"

24.2

"

17.6"

AIR INLET

LED

17.7"

GAS INLET

1.6"

9.4"0.4"

0.4"

0.4"

AIR INLET

26.2

"

23.1

"

1.4"2.8"3.9"5.5"6.7"

1.4"2.8"3.9"5.5"6.7"

7.7"

2.6"

2.8"

3.9"

6.1"

11"

5.3"

5.4"

14.4"

6.3"

6.9"

2.9"

GAS INLET (3/4")

(120VAC)

4- 0.5"6 - 0.24 x 0.4" OBLONG HOLE

4- 0.5"6 - 0.24 x 0.4" OBLONG HOLE


WATER OUTLET

WATER INLET

FLUE COLLAR

WIRING THROUGHWAYS


HOT WATER OUTLET

WATER DRAIN VALVE


COLD WATER INLET


WIRING THROUGHWAYS COLD WATER INLET (3/4")

(VIEW FROM TOP)

WIRING THROUGHWAY

26

N-0841MC

N-0841MC-DV

4- 0.5"


6.7"

5.5"

3.9"

2.8"1.4"

0.4" 9.4"

5.1"

1.6"

26.2

"

23.1

"

24.4

"

3.1"

FLUE COLLAR

1.1"

0.4"1.4"2.8"3.9"

5.5"

6.7"


AIR INLET

17.7"

COLD WATER INLET

WATER DRAIN VALVE

HOT WATER OUTLET

WATER DRAIN VALVE

CONDENSATE DRAIN

WIRING THOROUGHWAY

(120VAC)WIRING THOROUGHWAY

WATER DRAIN VALVE

GAS INLET

WIRING THOROUGHWAY(WATER FILTER)WATER DRAIN VALVE


WIRING THOROUGHWAY

2.8"3.9"


WIRING THOROUGHWAY

GAS INLET(3/4")

WIRING THOROUGHWAY

6.1"

4.3"

6.1"

5.3"

4.7"

2.8"2.

4"

13.7"

10.4"

10.0"

8.4"3.9"

(AC120VAC)

AIR INLET

LED

(VIEW FROM TOP)

HEIGHT OF EACH FITTINGFROM BOTTOM OF CASE

CONDENSATE DRAIN

HOT WATER OUTLET

COLD WATER INLET

GAS INLET 2.2"

2.2"

1.7"

0.9"

N-0841MC

18.4"

17.6"4"

4- 0.5"

CONDENSATE DRAIN (1/2")

[inch]

5.9" 9.2"

18.4"

17.6"

24.4

"

LED

17.7"

23.1

"

3.1"

0.4" 9.4"

5.1"1.1"

0.4"2.8"

2.4"

4.3" 3.9"

8.4"

5.3"

2.8"

10.0"

6.1"

3.9"

6.1"

10.4"

13.7"

4.7"

(120VAC)

26.2

"

1.4"2.8"3.9"5.5"

1.4"2.8"3.9"

5.5"6.7"

1.6"

4- 0.5"

6- 0.24 x 0.4" OBLONG HOLE

6.7"

HEIGHT OF EACH FITTING FROM BOTTOM OF CASEN-0841MC-DV

0.9"

HOT WATER OUTLET 1.7"

COLD WATER INLET 2.2"

"2.2TELNI SAG4"4"

AIR INLET FLUE COLLAR

WIRING THOROUGHWAY

WATER DRAIN VALVE

HOT WATER OUTLET

WATER DRAIN VALVE

COLD WATER INLET

WATER DRAIN VALVE(WATER FILTER)WIRING THOROUGHWAY

GAS INLET

WATER DRAIN VALVE

WIRING THOROUGHWAY(120VAC)

WIRING THOROUGHWAY


WIRING THOROUGHWAY

GAS INLET(3/4")

WIRING THOROUGHWAY


(VIEW FROM TOP)

4- 0.5"

6- 0.24 x 0.4" OBLONG HOLE

CONDENSATE DRAIN

CONDENSATE DRAIN

CONDENSATE DRAIN(1/2")

27

N-1321M-ASME

HEIGHT OF EACH FITTINGFROM BOTTOM OF CASE

HOT WATER OUTLET

GAS INLETCOLD WATER INLET

2.6"3.4"2.0"

28

RC-7649M (Optional for N-0531S (-OD), N-0631S (-OD))

5.0"

4.7"

0.8"

RC-7650M (Optional Canadian Version)

5.0"

4.7"

0.8"

29

4. Components

N-0531S

‚P‚U

‚`

‚P‚U

‚`

G.F.C.I

Hot Water Outlet

Anti-Frost Heater

Flow Control Valve

Heat Exchanger

Frost Sensing Switch

Anti-Frost Heater

High-Limit Switch

Flame Rod

Exhaust Flue

Ignition Electrode

Manifold

Gas Valve Unit

Circuit Board

Thermal Fuse

Igniter

Water Filter

Cold Water Inlet

Gas Inlet

ENW

30

N-0531S-OD

G.F.C.I

ENW

Exhaust TerminalAnti-Frost Heater

Anti-Frost Heater

High-Limit Switch

Flame Rod

Ignition Electrode

Manifold

Heat Exchanger

Thermal Fuse

Gas Valve Unit

Gas InletCold Water InletHot Water Outlet

Water Drain Valve

Water Flow Sensor

Circuit Board

Igniter

Fan Motor

Flow Control Valve

31

Exhaust Flue

High-Limit Switch

Flame Rod

Ignition Electrode

Manifold

Gas Valve Unit

Circuit Board


G.F.C.I.

Junction Box

Flow Control Valve

Water Flow Sensor

Transformer

Igniter

Burning LED

Thermal Fuse

Anti-Frost Heater


Heat Exchanger

Water Filter

Fan Motor

Gas Inlet

Water Drain Valve

Anti-Frost Heater

telnI retaW dloCteltuo retaW toH

N-0631S

*For models with serial numbers starting from2008.04-XXXXX and later (except the N-1321M-ASME),the Junction Box will be located on the outside of the case at the bottom of the unit. The 120V power connections can now be made at this location withoutremoving the front cover of the unit.

**For N-0751M(-DV, -OD), N-0841MC(-DV), and N-0931M(-DV, -OD, -ASME) models, the Remote ControllerConnections are also located at the bottom of the unit.

External connectionterminal block

Wiring throughway

Junction Box

Power Cord

Ground

Remote controller cord

32

Exhaust Terminal

Anti-Frost Heater

Hot Water outlet

retliF retaWevlaV niarD retaW

Cold Water Inlet

Junction Box

Gas Inlet

Burning LED

Water Flow Sensor

Flow Control Valve

Thermal Fuse

Anti-Frost Heater

Igniter

Heat Exchanger

Transformer

Manifold

G.F.C.I.


Circuit Board

Gas Valve Unit

Fan Motor

Ignition Electrode

Flame Rod

High-Limit Switch

N-0631S-OD




Wiring throughway

Junction Box

Power Cord

Ground


33

Current Leakage Safety Device(GFCI)

Remote Controller Terminal Block

Heat Exchanger

Thermal Fuse

High Limit Switch

Anti-Frost Heater

Igniter

Manifold

Circuit Board

Water Flow Sensor

Air Inlet Thermistor

Gas Inlet

Anti-Frost HeaterWater InletWater Filter

Water Drain Valve

Hot Water Outlet

Anti-Frost Heater

Junction Box

Main Flow Control Valve

Bypass Flow Control Valve

Transformer

Fan Motor

Ignition Electrode

Flame Rod

Heat Exchanger Thermistor

Exhaust Flue

N-0751M




Wiring throughway

Junction Box

Power Cord

Ground


34

N-0751M-DV




Exhaust Flue

Heat Exchanger

Thermal Fuse

High Limit Switch

Anti-Frost Heater

Igniter

Manifold

Circuit Board

Gas Valve Mechanism

Water Flow Sensor

Gas Inlet

Anti-Frost HeaterWater InletWater FilterWater Drain Valve

Hot Water Outlet


Anti-Frost Heater

Junction Box



Transformer

Fan Motor

Ignition Electrode

Flame Rod

Air Inlet




Wiring throughway

Junction Box

Power Cord

Ground


35

N-0751M-OD




Heat Exchanger

Thermal Fuse

High Limit Switch

Anti-Frost Heater

Igniter

Manifold

Circuit Board

Water Flow Sensor


Gas Inlet

Anti-Frost HeaterWater InletWater Filter

Water Drain Valve

Hot Water Outlet

Anti-Frost Heater

Junction Box



Transformer

Fan Motor

Ignition Electrode

Flame Rod

Exhaust Flue




Wiring throughway

Junction Box

Power Cord

Ground


36

N-0751M-DVC

Igniter

Flue Collar

Air Inlet

Heat Exchanger

High Limit Switch

Anti-Frost Heater

Manifold

Circuit Board


Tr ansformer

Gas InletWater Inlet

Anti-Frost Heater

Water Flow Sensor

Water Drain ValveJ unction Box

Hot Water Outlet

Anti-Frost Heater



Fan Motor

Thermal Fuse


Flame Rod

37

N-0931M

Exhaust Flue



Anti-Frost Heater



Flame Rod

Ignition Electrode

Fan Motor

Water Outlet Thermistor

Heat Exchanger

Circuit Board

Transformer

Junction Box

Anti-Frost Heater

Hot Water Outlet

Water Drain Valve Water Filter Water Inlet Anti-Frost Heater

Gas Inlet



Current Leakage Safety Device (GFCI)

Water Flow Sensor

Manifold

Igniter

Anti-Frost Heater

High Limit Switch

Thermal Fuse




Wiring throughway

Junction Box

Power Cord

Ground


38

N-0931M-DV

Air Inlet




Flame Rod

Ignition Electrode

Fan Motor

Transformer



Junction Box

Anti-Frost Heater

Hot Water Outlet

Water Drain Valve

Water Filter

Anti-Frost HeaterWater Inlet Gas Inlet




Water Flow Sensor

Gas Valve Mechanism

Circuit Board

Manifold

Igniter

Anti-Frost Heater

High Limit Switch

Thermal Fuse

Heat Exchanger

Exhaust Flue




Wiring throughway

Junction Box

Power Cord

Ground


39

N-0931M-OD

Exhaust Flue



Flame Rod


Ignition Electrode

Fan Motor


Transformer

Junction Box

Anti-Frost Heater

Hot Water Outlet

Water Drain Valve Water Filter Water Inlet Anti-Frost Heater


Water Flow Sensor


Gas Inlet


Circuit Board

Manifold

Igniter

Anti-Frost Heater

Thermal Fuse

High Limit Switch

Heat Exchanger




Wiring throughway

Junction Box

Power Cord

Ground


40

N-0841MC

Exhaust Flue

Anti-Frost Heater

Thermal Fuse

Flame Rod

Neutralizer

Ignition Electrode

Fan Motor

Tr ansformer

Anti-Frost Heater

Water Drain Valve

Condensate Drain

Water Filter

Water Flow Sensor

Anti-Frost Heater

Water InletGas Inlet

Water Drain Valve



Anti-Frost Heater

Manifold

Circuit Board

Anti-Frost Heater

Igniter

High Limit Switch

Primary Heat Exchanger

Anti-Frost Heater



Secondary Heat Exchanger




Remote Controller Te rminal Block

Water Drain Valve

Hot Water Outlet

J unction Box

41

N-0841MC-DV

Gas Inlet


Anti-Frost Heater

ManifoldCircuit Board

Anti-Frost Heater

Igniter

High Limit Switch

Primary Heat Exchanger

Anti-Frost Heater


Exhaust FlueAir Inlet


Anti-Frost Heater



Thermal Fuse

Fan Motor

Tr ansformer

Anti-Frost Heater

Anti-Frost Heater

Hot Water Outlet

Water Drain Valve

Water InletWater Filter

Water Flow Sensor

Water Drain Valve


Flame Rod

Ignition Electrode

Neutralizer


Remote Controller Te rminal Block Junction Box

Condensate Drain

Secondary Heat Exchanger

42

N-1321M-ASME

43

Remote controller (RC-7649M and RC-7650M)

Display (RC-7649M)

Display

For setting the hotwater temperature,

and other settings.

For turning the

Flow Meter Alarm Set Button

meter alarm.

Setting Buttons

* Before use, remove the protective sheet from the remote controller surface.* The unit has been shipped from the factory with the remote control set at 110°F.

Temperature Setting

(Ex.: 105°F)

Flow Meter Setting

meter alarm set button.

Error Code

When this indicatoris lit, the hot watertemperature can beset.

Priority Indicator

The illustration below shows an example of the remote controller display.What is actually displayed depends on how the water heater is set.

Burner On Indicator

failure occurs.

(Type RC-7649M)

Display (RC-7650M)

44

5. TroubleshootingError Codes and Checkpoints (With optional remote controller connected.)

Description

Ignition Failure

Flame Rod Does NotDetect Flame (SecondaryFlame Fault Detection)

Abnormally High OutputTemperature

High Limit Switch

Neutralizer Water LevelElectrode Abnormality

Circuit board Abnormality

Gas Solenoid ValveAbnormality

Remote Controller Transmission Abnormality

Combustion Abnormality(Warning indication)

Combustion Abnormality(Unit shuts off)

Flame Rod Abnormality

Combustion Abnormality

Display

10

11

12

14

16

20

29

70

71

72

73

90

99

760

obstruction

connection, What size is gas line, Is the LP tank full

Check Check for damage offuse

Check outlet water temperature, Is the water hard, Is the water

Check high limit switch connection, Is the water hard

Check for neutralizer and/or drain pipe blockage, Check for properconnection of water level electrode

Check gas valve connections, Check for damage to gas valve

Check Remote Controller Cord, Check wiring connections ifMulti-System or Quick-Connect is in use

Check for abnormal combustion

is gas line, Is the LP tank full

Check for abnormal combustionCombustion abnormality(Unit shuts off)

Check for abnormal combustion

Circuit board failure

Improper Circuit BoardSetting

Check circuit board for damage and proper connections,Unplug/replug power to unit if wiring was altered duringoperation

Pressure SwitchAbnormality21 blockage or obstruction (For N-1321M-ASME)

Freeze ProtectionThermostat30 Check freeze protection thermostat connection

Inlet ThermistorAbnormality31 Check inlet thermister connection

Outlet ThermistorAbnormality32 Check outlet thermister connection

Heat ExchangerThermostat33 Check heat exchanger thermostat connection

Flow Sensor Abnormality41

Combustion Abnormality

59

Fan Motor Abnormality61 Check that the fan is rotating

63

56

Main Water Control Valve65 Call Noritz Technical Support (866-766-7489)

Bypass Water Control Valve66 Call Noritz Technical Support (866-766-7489)

92

93

Multi-SystemCommunication Error

(F) 76 Check for proper connection of the Quick-Connect Cord orMulti-System Controller.

*In a quick connect multi-system, "F##"(except F76) indicates an error code from the secondary unit (unit without a remote).The ON/OFF condition of the neutralizer water level electrode can be checked using the maintenance monitors. When maintenance monitor number19 reads "000", the condition of the electrode is normal. When this monitor reads "111", the condition of the electrode is abnormal.

CCP Valve Abnormality

Recirculation Pump ErrorCheck for proper pump operationCheck recirculation hot water supply pipe

Neutralizer Life CycleWarning

Neutralizer Life Cycle End

Replace neutralizer (Refer to instructions included with replacement neutralizer

operation with System Controller

Check for flame on burner

Diagnosis Point (Trouble Point)

410 Multi-System FlowImbalance Error

Check flow for blockage or obstruction Check flow sensor and filter for debris and/or damage

Overheat Cutoff Fuse

45

Error Codes and Checkpoints (No remote controller connected.) <N-0631S (-OD) only>

No. ofFlashes

Reset Method(without Remote

Controller)

Will Unit Work After

Being ResetOther Symptoms

No Reset

YES

It's available to burn even before reset.

It's available to burn even before reset.

10 90

90

11 12

72

73

90 59 16

61

If power button is on immediately 32 20 72 71 99

NO 70

Error CodeRepresentation

NO

NO

NO

5

4

3

Contin-uousFlashing

Disconnect Power

Disconnect Power

Reset Method(with Remote

Controller)

Disconnect Power

Disconnect Power

Disconnect PowerDisconnect Power

Disconnect Power

Power Button

Power Button

Power Button

Power Button

YESYESYES

YES

YESYES

YES

is no remote controller installed.

No Reset YES

14

46

Setting Button(Switching Indication)(Changing Data No.)

Operation button

Display(Data No.)

Remote Controller (Optional for N-0531S (-OD), N-0631S (-OD))RC-7649M

Displaying Maintenance Monitors

<Display Procedure>1. Press and hold both the up [ ] and down [ ] setting buttons simultaneously for more than two seconds.

This can be done regardless of whether the power has been turned on or the unit is operating.

<Indications>1. The maintenance monitor data no. will appear on the display for two seconds, and then the data will appear.2. In order to switch to other maintenance monitor data, press either the up or down button once. The data no.

] and [ ] down buttons. Whenthe maintenance monitor data no. is changed, the data no. will be displayed for two seconds, after which thedata will appear.

be adjusted.

<Returning to Normal Mode>1. For releasing the indication, press and hold both [ ] and [ ] of the setting button simultaneously more than

two seconds, or leave it alone for more than 10 minutes.

<Clearing Error Codes from Memory>When the power is OFF, press and hold the down [ ] button for more than 5 seconds.

10 times

1 hourX 1

140.1 gal/min.gal/min.X 0.1

0.1 L/min.L/min.X 0.1

Number of Ignition Times

Total Combustion Time

Disp. Range [000] – [999]emit70

Item

Data(Display Reading x Multiplier)

Multiplier Unit

Minimum Value for Indication

Remarks

Disp. Range [000] – [999]

Disp. Range [000] – [1310]03 Total Plug-in Time

04

DataNo.

hour

1000 hoursX 1000Total Combustion Time Disp. Range [000] – [65]ruoh50

hourX 100

X 10

10000 timesNumber of Ignition Times Disp. Range [000] – [65]emit008 001 X0

°FX 130

31X 1 °F

1°F

1°F

°CX 1

X 1 °C

0.5 °C

0.5 °C

Inlet Thermistor Temperature Reading

Outlet Thermistor Temperature Reading

Most Recent ErrorCodeNext Most RecentError CodeNext Most RecentError CodeNext Most RecentError CodeNext Most RecentError CodeNext Most RecentError CodeNext Most RecentError CodeNext Most RecentError CodeError Code History 8

Error Code History 7





98

97

96

95

94

93

92

91 Error Code History 1

Error Code History 2If the same error code is

repeated, it will appear in

the history list twice. If it

is repeated more than twice,

it will only appear twice.

Total Flow Rate

*1 When RC-7649 is used.*2 When RC-7650 is used.

- To view the maintanence monitors of another unit in a multi-system or Quick Connection installation, press the FLOW METER ALARM SET button (while in monitor mode) to switch to the desired unit (N-0751M(-DV,-OD), N-0841MC(-DV), N-0931M(-DV,-OD),and N-1321M-ASME).

- If the Circuit Board needs to be replaced on a unit that has been operating for longer than 1 year, the neutralizer will also requirereplacement.

*1

*2

*1

*2

*1

*2

Maintenance Monitor List (Using Optional Remote Controller)

150.1 gal/min.gal/min.X 0.1

0.1 L/min.L/min.X 0.1

Heat Exchanger Flow Rate(751, 841, 931 series, and N-1321M-ASME only)

*1

*2

47

100 hours

13 Neutralizer Life Cycle Counter X 10 hour 10 hours [000] – [1999]

**

**

**

**

** For N-1321M-ASME, the multiplier value is X 0.1.

48

Neutralizer life cycle warning and replacement procedures (N-0841MC series only)

Neutralizer life cycle counter operation: neutralizer usage estimateWhen the water heater operates at full capacity, the life cycle counter will add 1 hour of neutralizer usage for approxi-mately every hour of water heater usage time.

Life cycle warning steps1. Error code “92” will display on the remote controller when life cycle counter has reached 1114 hours (maintenance

monitor will display “111”).2. Error code “92 will display on the remote controller and the maximum hot water capacity will be limited to 2.6 GPM

when the life cycle counter has reached 1214 hours (maintenance monitor will display “121”).3. When the life cycle counter has reached 1314 hours (maintenance monitor will display “131”), error code “93” will

display on the remote controller and the water heater will operate in safe mode only.

Note : When replacing the neutralizer, it is necessary to reset the life cycle counter; refer to the proceeding sections forinstructions.

Neutralizer Replacement

Replace the neutralizer following the procedures below:1. Disconnect electrical power to the unit.2. Drain water from the neutralizer using the drain valve located underneath the water heater (Fig. 1).

drain hose (Fig. 1). Remove the neutralizer by lifting up on it to disengage the tabs. Note) When removing the drain hoses, make sure that water in the hose does not come into contact with your eyes

allow water from the drain hoses or neutralizer to leak into the water heater.4. Connect the neutralizer drain hose (with pin clip) to the new neutralizer and install the neutralizer.

Reconnect drain hose 1 and drain hose 2 as well as the relay connector. Note) Drain hose 1 and drain hose 2 must be oriented so that there is a downwards slope and there are no bends

or kinks in the hoses.Do not connect the wires labeled as "Connector (Factory Use Only)" as shown in Fig. 1.

Pin clip

Drain hose 2

Fixing screw

Drain hose 1

Water Level Electrode

Tab

Relay connector

Neutralizer drain hose

Connector(Factory Use Only)

Neutralizer packing

tnorFraeR

Fig.1

Drain valve (underneath water heater)

49

Resetting the Unit

5. Reset the neutralizer life counter.5-1 Reconnect electrical power to the unit.5-2 Refer to the next section "Resetting the Unit" to reset the neutralizer life counter at the circuit board.

"Displaying Maintenance Monitors" for instructions ). Maintenance monitor number 13 should read "000" on the remote controller if a successful reset has been performed.

The neutralizing agent is high purity calcium carbonate (limestone) and it does not contain chemical substances that are harmful to the environment. Dispose of the old neutralizer according to local waste regulations.

Caution

Disposal method of Neutralizing agent (calcium carbonate) remaining in the neutralizer after replacement

This is to prevent dangerous exhaust gases from entering the building.

Refer to the installation manual or contact Noritz America Technical Support (866-766-7489) for instructions.

Danger

Reset the neutralizer life counter according to the procedures below after replacing the neutralizer.

<Resetting at the Circuit Board>

unit, press "the Minimum Manifold Pressure Set Button" and "the Maximum Manifold Pressure Set Button" at thesame time for 10 seconds (Fig. 2).

2. When the fan motor turns and the gas valve unit cycles ON/OFF (cycles of 2 seconds), the reset procedure iscomplete.

Minimum Manifold PressureSet Button

Maximum Manifold PressureSet Button

UP

DOWN

Fig.2

50

Gas MeterSelect a gas meter capable of supplying the entirebtuh demand of all gas appliances in the building.

Gas ConnectionDo not use piping with a diameter smaller thanthe inlet diameter of the water heater.

are rated for max Btuh of the heater (see below).

Use only approved gas piping materials.

Gas PressureSize the gas line according to total btuh demandof the building and length from the meter orregulator so that the following supply pressuresare available even at maximum demand:

Measuring Gas Pressure

In order to check the gas supply pressure to the unit, atap is provided on the gas inlet. Remove the hex headphilips screw from the tap, and connect a manometerusing a silicon tube.

In order to check the gas manifold pressure, a pair oftaps are provided on the gas valve inside the unit.The pressure can be checked either by removing the hexhead philips screw and connecting a manometer with asilicon tube, or by removing the 1/8" NPT screw with anallen wrench and connecting the appropriate pressuregauge.

Gas Line Requirements

Natural GasMeter

Noritz Gas Water Heater(see “Maximum Performance” table below)

Clothes Dryer(35,000 Btuh)

Barbecue(50,000 Btuh)

Gas Range Stove(65,000 Btuh)

10'

10'

10'

10'

5'

5'

5'5'

Gas Fireplace(25,000 Btuh)

Instructions1. 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 CalculationOutlet A: 45' (Use 50'), 50,000 Btuh requires 1/2"Outlet B: 40', 65,000 Btuh requires 1/2"Section 1: 45' (Use 50'), 115,000 Btuh requires 3/4"Outlet C: 30', 35,000 Btuh requires 1/2"Section 2: 45' (Use 50'), 150,000 Btuh requires 3/4"Outlet D: 25' (Use 30'), 25,000 Btuh requires 1/2"Section 3: 45' (Use 50'), 175,000 Btuh requires 1"Outlet E: 25' (Use 30'), 180,000 Btuh requires 3/4"Section 4: 45' (Use 50'), 355,000 Btuh requires 1-1/4"

Section 3 Section 2 Section 1

Outlet A

Outlet B

Outlet C

Outlet D

Outlet E

5' 5'Section 4

properly. An undersized gas line could result in under heated water temperatures and an error codedisplayed on the operation panel. To verify a properly sized gas line, follow the below procedures. The

supplied gas from other that a dedicated line, it is recommended that the other appliances be turned on toensure an adequate supply is available for the unit.

N-0531S (-OD)N-0631S (-OD)

N-0751M (-DV,-OD,-DVC)N-0841MC (-DV)

Min: 4” WCMax: 10.5” WC

Min: 8” WCMax: 14” WC

Natural Gas Supply Pressure

LP Gas Supply Pressure


Min: 8” WCMax: 14” WC




Min: 10.5” WCMax: 14” WC



Maximum Performance (btuh)

**See next page for pipe capacity charts

N-0531S (-DV, -OD) : 140,000 btuh N-0631S (-DV, -OD) : 180,000 btuhN-0751M (-DV, -OD, -DVC) : 199,900 btuhN-0841MC (-DV) : 199,900 btuhN-0931M (-DV, -OD) : 250,000 btuh

N-0931M (-DV, -OD)N-1321M-ASME

N-1321M-ASME : 380,000 btuh

51

Gas Line Sizing for a Noritz Gas Water Heater Maximum Natural Gas

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

Length in Feet

Length in Feet

PipeSize

PipeSize

1/2"

1/2"

3/4"

3/4"

1"

1"

1 1/4"

1 1/4"

1 1/2"

1 1/2"

2"

2"

2 1/2"3"

3 1/2"4"

174363684140421034050645511,41216,70923,277

1192494709651445278444377843

11,48415,998

9620037777511612235356362999222

12,847

Adapted from UPC 1997

82171323663993

1913304953917893

10,995

73152286588880

16962703477869959745

6613825953279815362449432963388830

61127239490734

14132253398358318123

56 53 50 44118 111 104 93222 208 197 174456683

13152096370554257557

428641

12341966347650907091

40460511651857328448086698

35853610331646291042615936

2755671071220533076221

189393732

149622994331

152315590

121218583465

129267504

103915592992

114237448913

14172646

103217409834

12752394

9619637877111812205

8918534672410862047

8317332267710231921

781623076309761811

69146275567866

1606

631322525117871496

55112213440675

1260

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

Size3/4"1"

1 1/4"1 1/2"

2"

206383614

12612934

147269418888

2078

1212183347231698

105188284625

1472

94168251559

1317

861532275091203

80141209471

1114

75132194440

1042

71125181415983

67118171393933

5594

137320762

4882

116277661

R

Maximum Capacity of Flex TracPipe in Thousands of Btuh ( 0.5" WC Pressure Drop)

Length in FeetPipeSize3/4"1"

1 1/4"1 1/2"

2"

325605971

19934638

232425661

14043285

191344528

11432684

166297449988

2327

149265397884

2082

1362413598051902

126222330745

1761

118208307696

1647

112197286656

1554

106186270621

1475

87143217506

1205

76129183438

1045

R

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


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

Size1/2"3/4"1"

1 1/4"

12" 24" 36" 48" 60" 72"180 150

290581

1470

125255512

1200

106215442

1130

93197397960

86173347930

Length in InchesPipeSize1/2"3/4"1"

1 1/4"

12" 24" 36" 48" 60" 72"288 240

465930

2352

200409825

1920

169344708

1808

149315638

1536

137278556

1488

Maximum Capacity for Gas Flex Connectors in Thousands of Btuh ( 0.5" WC Pressure Drop)


Tr acPipe® is a registered trademark of Omega Flex.

10’ 20’ 30’ 40’ 50’ 60’ 70’ 80’ 90’ 100’ 125’

10’ 20’ 30’ 40’ 50’ 60’ 70’ 80’ 90’ 100’ 125’ 150’ 200’

10’ 20’ 30’ 40’ 50’ 60’ 70’ 80’ 90’ 100’ 150’ 200’

10’ 20’ 30’ 40’ 50’ 60’ 70’ 80’ 90’ 100’ 150’ 200’

52

(Ex. N-0631S)

Periodic Maintenance

Wipe the outside surface with a wet cloth, then dry the surface. Use a neutral detergent toclean any stains.

Do not use benzene, oil or fatty detergents to clean the remote controller;deformation may occur.The remote controller is water resistant but not water proof. Keep it as dry as possible.

Periodic Inspection

Check For laundry, newspaper, timber,oil, spray cans and othercombustible materials.

Equipment

Remote Controller

Wipe the surface with a wet cloth.

For abnormal soundsduring operation.

For abnormalities inexternal appearance,

For water leaks from theequipment and piping.

For dust or debris inthe air inlet.

For dust and soot inthe exhaust vent orexhaust vent terminal.

For proper operation ofpressure relief valve.

Check

Check

Check

Check

Check

Check

CAUTION

wait until the equipment cools before performing maintenance. *= N-0631S (-OD) onlyBe sure to do.

53

Periodic Maintenance

* To avoid burns, wait until the equipment cools down before draining the water.

Water Drain Valve (with Water Filter)

1. Close the water supply valve.

3. With a bucket ready, remove the inlet and outletdrain plugs (about 0.2 gal. will drain out)

of the inlet. (See illustration to right).

a brush under running water.

and close the drain plugs.(Take care not to lose the packing.)

8. Open the water supply valve and check thatwater does not leak from the drain plugs or water

Water SupplyValve

Inlet

Packing

Water drain valve

(Ex. N-0631S)

54

Figure 1. Flush Set-up

Bucket

Pump

Hose

Hose

Water Outlet

Water Inlet

Periodic MaintenanceIf the unit becomes saturated with lime or scale build-up, the hot water may not run smoothly, or the unitmay put out cold water. In addition, damage can occur resulting in failure of the unit if lime or scaledeposits are left untreated within the unit. To remove these deposits from the unit, follow the procedureas explained below. To ensure full warranty coverage, hard, acidic, or otherwise impure water should betreated with approved methods.Note: Isolation valves will need to be installed in order to perform this procedure.

1. If not already on, turn the unit on with the Power Button on the Remote Controller.2. Close the gas supply valve.3. Close both the hot and cold water valves with a quarter turn of the main valve wing handle.

The handle will be perpendicular to the main valve body.4. Ensure the drain valve lever handles are closed on both the hot and cold valves (the lever

will be perpendicular to the drain portion of the body) and slowly remove drain caps. Be sure toretain the rubber washer inside of the drain cap.

5. Connect the pump outlet hose to the cold water drain valve of the isolation valve as shown in Figure 1. 6. Connect a drain hose to the hot water drain valve outlet of the isolation valve as shown in Figure 1.7. Pour approximately 5 gallons of virgin food grade white vinegar or a solution of Lime Away

(or CLR) and water (diluted 3 parts water to 1 part Lime Away or CLR) into a bucket.8. Place both the pump inlet hose and the drain outlet hose into the pail.9. Open both drain valve lever handles on the isolation valves.

Allow the solution to circulate for 45 minutes.Note: It may take a few minutes to clear air out of the heater and hoses.

12.Remove the hose from the cold water drain valve andreplace cap and washer onto the drain valve outlet.

13.Remove the pump and hose from the bucket and emptythe solution.

14.Put the hot water drain hose end back into the emptybucket and open the cold water main valve wing handle.

Flush for at least 5 minutes or until 20 gallons of water haspassed through the heater.

15.Close the cold water main valve wing handle and clean

16.Close the hot water drain valve lever handle, remove thedrain hose and replace cap and washer onto the hot waterdrain valve outlet.

17.Open both the hot and cold water main valvewing handles. Wing handles should now be(OPEN) parallel to the main valve body and leverhandles should be (CLOSED) perpendicular tothe drain portion of the body, which is the normaloperating position.

18.Open the gas supply valve and reset the unit

the Power Button on the Remote Controller.

55

Changing Default Temperature Setting

* The water heater has been factory set to allow a maximum temperature setting of 120°F.To access higher temperature settings through the remote controller, follow the below steps.

The N-0631S can be programmed so that it will default to one of three temperatures (140, 130, 120°F)when the optional remote controller is not connected. To change the default temperature, connect the temperature selection wire as shown in the below diagram.Note: If the 160°F connector is being used, the unit will automatically default to a temperature of 120°F

for safety if the remote controller is not installed.

* The water heater has been factory set to allow a maximum temperature setting of 120°F.To access higher temperature settings with the optional remote controller installed, follow the belowsteps. The unit can only be set to temperatures in the range of 145-160°F when the optional remotecontroller is installed.

<When setting the maximum temperature to 125-140°F>

2. Press and hold the FLOW METER ALARM SET button until a sound is heard (2 sec.) and "120°F"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 using theUP and DOWN setting buttons.

4. To put the water heater back into operation, press the ON/OFF button on the remote controller.


controller.2. Disconnect electrical power to the water heater.3. Remove the front cover of the water heater (4 screws).4. Locate the bag of temperature selection wires attached to the inside

of the unit in the bottom left corner.5. Connect the temperature selection wire labeled "160°F" to

the circuit board as shown on the right.6. Replace the front cover of the water heater (4 screws).7. Reconnect electrical power to the water heater, but do not turn it on.8. Press and hold the FLOW METER ALARM SET button until a sound is

heard (2 sec.) and "120°F" appears on the display.9. Set the upper limit of the hot-water supply temperature to

125°F, 130°F, 135°F, 140°F, 145°F, 150°F, 160°F usingthe UP and DOWN setting buttons.


UP

DOWN

EMWRe

mot

eC

ontr

olle

r

<N-0531S (-OD), N-0631S (-OD)>

56

Changing Default Temperature Setting

* The water heater has been factory set to allow a maximum temperature setting of 120°F.To access higher temperature settings through the remote controller, follow the below steps.

* When using the remote controller with a multi-system controller, the maximum temperature of thewater heater can be set up to 180°F without making the following settings.

the hot water will be very high and that there is a risk of scalding.Water temperatures above 125°F can cause severe burns or death from scalding.


2. Press and hold the FLOW METER ALARM SET button until a sound is heard (2 sec.) and 120°Fappears on the display.

3. Set the upper limit of the hot-water supply temperature to 125°F, 130°F, 135°F or 140°F using theUP and DOWN setting buttons.



controller.2. Disconnect electrical power to the water heater.3. Remove the front cover of the water heater (4 screws).4. Connect "WATER TEMPERATURE ADJUSTMENT CONNECTOR" tag

connector to "180°F" tag connector as shown on the right.5. Replace the front cover of the water heater (4 screws).6. Reconnect electrical power to the water heater, but do not turn it on.7. Press and hold the FLOW METER ALARM SET button until a sound is

heard (2 sec.) and 120°F appears on the display.8. Set the upper limit of the hot-water supply temperature to

125°F, 130°F, 135°F, 140°F, 145°F, 150°F, 160°F, 170°F or 180°Fusing the UP and DOWN setting buttons.


The water heater can be programmed so that it will default to one of four temperatures if the remotecontroller is removed (180, 140, 130, 120°F). To change the default temperature, connect thetemperature selection wire as shown in the above diagram. The default temperature is 120°F whenthe temperature selection wire is not connected.

WATER

TEMPE

RATU

RE

ADJU

STMEN

T CON

NECT

OR

WATER TEMPERATUREADJUSTMENT CONNECTOR(the back : 55 C) (the back : 60 C)

(the back : 83 C)

<N-0751M (-DV, -OD, -DVC), N-0931M (-DV, -OD), N-0841MC (-DV)>

For changing the default temperature setting on the N-1321M-ASME, please contact NoritzTechnical Support (866-766-7489) for further instructions.

57

Draining the water for maintenance or for freeze prevention (N-0841MC series only)

To avoid burns, wait until the equipment cools downbefore draining the water. The appliance will remain

High Temperature

CAUTION

4 Open all drain plugs and drain the water out ofthe unit.

1

Close the water supplyvalve.

6 Close the gas valve and disconnectthe electrical power supplied to the unit.

2

3 Fully open all

Fixture

Drainage Using the Remote Controller (N-0841MC series only)

2(1) Turn the p

(2) Turn and leave open

for more than 2 minutesand close.* If multiple units are being used,

drain two minutes for each unit.* An 11 Error Code may appear on

the remote controller.This is not a malfunction of the unit.Do not turn Power ON/OFF Button OFF.

Manual Draining

Close the water supplyvalve and disconnectthe electrical powersupplied to the unit.

3

4

5 When the water is completely drained, replace

5Open all drain plugs and drain thewater out of the unit.

6

Close the gas valve.1

When the water is completely drained,replace all drain plugs and close the

Fixture

Fixture(Ex. 120°F)

Do not touch with wet hands.Drain Plugs

Do not touch with wet hands.

Drain water into a bucket to prevent water damage.

(2) button for about two secondsuntil the alarm sounds.The maximum hot water

set button again.

(4) Press the setting buttonmarked “ “. The displaywill change from "oF" to "on"after the button is pushed.

(ex. N-0841MC)

58

6. Installation Check

Installation problems can cause the unit to work unsatisfactorily. If the unit is not working properly, but there areno error codes or evidence of malfunction, check the installation.

* Installation Checks:

Altitude

1. If this water heater is installed in a location where the altitude is greater than 2000 ft., the combustion may

installations by disconnecting the "High Elevation Disconnect" jumper located inside of the water heater. Referto the"Installation Manual" for detailed instructions.

Air Supply/Exhaust

1.2. Install the venting only as outlined in the installation manual.

Installation Environment

1. If this unit will be installed in a factory, salon, or laundry service, install it in a location where it will not beexposed to steam, ammonia, sulfur, chlorine, ethylene compounds, or acids.

3. Avoid any installation that will expose the unit to steam or moisture.

For Multiple Floor Water Supply

through the unit, there must be at least 29 PSI of water pressure at the inlet to the unit. If this supply waterpressure cannot be maintained, install pumps to increase the pressure and install a pressure gauge to adjustthe supply pressure to the desired level. If the supply pressure to the water heater falls below this level, boilingmay occur in parts of the heat exchanger, causing an abnormal sound and possibly damaging the waterheater.

Installation of Strainer

1. If the unit will be installed in a system with a circulating or pressure increasing pump, install a strainer with a#50 or greater mesh to protect the unit from damage caused by debris in the plumbing line. This is especiallyimportant for older piping.

59

* Installation Cautions

Gas Supply Piping

Because a large quantity of gas is used with these appliances, make sure to size the gas meter and supplypiping to match the maximum Btu rating of the heater.

Air Supply and Vent Pipe

Before installation, note the following: Vent pipe diameters and maximum vent length:

Vent Pipe Diameter ø 4 inches

Maximum Vent Length 15 feet with 3- 90° elbows*

allowable vent length.* A longer vent will cause a danger of explosion.

Choose a good path for the vent pipe.

Extend the vent pipe all the way to the outdoors. Steam and condensed water may exit the vent pipe. Be sure to install the vent pipe so that the steamand water droplets will not harm anything.

Filling the neutralizer unit before vent pipe installation.

DANGER This is to prevent dangerous exhaust gases from entering the building.

1) Fill the neutralizer unit by pouring approx. 17 oz. (500ml) of water into the exhaust accessory on thetop of the appliance as illustrated below.

Or, if the vent pipe has already been installed:2) After installing the drain pipe, make sure that the area around the appliance is well ventilated; open a

window or a door if necessary.Then, operate the unit and verify that condensate is coming out of the drain pipe.(During normal use of the water heater, condensate will begin to discharge from the drain pipe within 15 minutesof use. However, depending on the season and/or installation site conditions, it may take longer.)

17 oz.500ml

Intake

Exhaust

60

Electrical

Allocate 2A on the circuit for this water heater.If more than one unit is being installed, allocate an appropriate circuit to provide power for each unit.

Condensate Piping (N-0841MC series only)

operation. The water heater heater incorporates a collection, neutralization, and removal system whichmust be properly drained in order to ensure proper operation of this appliance.The water heater is supplied with a pre-installed condensate neutralization system. No additional neu-tralizer is required unless local code dictates otherwise.

Use plastic pipe, such as PVC, for the drain line. Do not use steel, black iron, or any other material whichcan corrode when placed into contact with water.Keep the length of the drain pipe as short as possible. Long runs or applications where the nearest drainis above the water heater will require the use of a condensate pump. Size the pump to allow for amaximum condensate discharge of 2 GPH from the water heater.Horizontal runs must be sloped 1/4" per foot towards the drain or condensate pump.The end of the drain pipe must not be submerged in water or blocked in any way.

started.Take measures to prevent the condensate drain lines from freezing (insulation, heat tape, electric heat-ers, etc.).

Slope pipe downwards 1/4" per foot.

1/2" PVC pipe

The end of the drain pipe must have an air gap.

The end of the drain pipe must have an air gap.

Floor drain Slope pipe downwards 1/4" per foot.

1/2" PVC pipe

1/2" PVC elbow3/8" ID tubing*

* Install tubing according to pump manufacturer's instructions.

Condensate piping with pump

Condensate pump

The electrical power supply to the unit should be installed by a qualified technician.

Noritz Field Manual - 2009

Documents