Noritz NR501-OD User manual

1

NORITZ America Corporation

Gas Water Heater

NR501-OD

NR662-OD

NRC661 (-DV, -OD)

NRC711 (-DV,-OD)

Service Manual

• Refer to this manual whenever performing service or

maintenance on this appliance.

• This manual will be used for service technician training seminars.

• The specifications and descriptions in this manual may be

changed without prior notice.

• For further assistance, contact Noritz Technical Support at

1-866-766-7489.

Do not short circuit any safety device on

this appliance

Rev: Dec, 2013

Contents

Important Safety Information .................................................................................................... 2

1. Speciﬁcations/Performance Table ....................................................................................... 3

2. Dimensions ......................................................................................................................... 9

3. Components ....................................................................................................................... 12

4. Operating Principle ............................................................................................................. 16

5. Operation Flow Chart .......................................................................................................... 19

6. Wiring Diagram ................................................................................................................... 25

7. Troubleshooting .................................................................................................................. 28

• Error Codes and Checkpoints ......................................................................................... 28

• Circuit board checkpoints ................................................................................................ 29

• Error Code Diagnostic Flow Charts .............................................................................. 31

• Displaying Maintenance Monitors ................................................................................... 59

• Maintenance Monitor List ................................................................................................ 60

• Circuit Board Replacement ............................................................................................. 61

• When Changing the Fan Motor ....................................................................................... 63

• Gas Line Requirements ................................................................................................... 64

• Manifold Gas Pressure Adjustment ................................................................................. 67

• Water Treatment ............................................................................................................. 73

• Periodic lnspection ......................................................................................................... 68

• Periodic Maintenance ..................................................................................................... 69

• Changing Default Temperature Setting ........................................................................... 75

8. Installation Check .............................................................................................................. 79

KS-11-0004

• Preventing Freeze Damage .................................................................................................. 76

2

Important Safety Information

To prevent damage to property and injury to the user, the icons below warn of

varying levels of risk.

Caution

Warning

Ignoring this indication will cause an immediate danger of death or

serious injury.

Ignoring this indication may result in death or serious injury.

Prohibited.

1. Safety Tips for Service

• Wear the appropriate clothing and protective gear:

In order to prevent injury or accident, wear a protective helmet, safety boots and a

lifting belt whenever necessary.

Caution

• Use only the appropriate tools and parts:

Warning

Only use replacement parts manufactured by Noritz for this model as listed in the

Installation Manual Parts List for service on this unit. Use appropriate tools.

• Modification of the unit is prohibited:

Do not attempt to modify or alter the unit. This will cause a re hazard and a risk of

electrical shock.

• When servicing:

Warning

Disconnect the power supply during maintenance and repairs to reduce the risk

of electric shock. If it is necessary to have the electricity connected during repairs,

use extreme 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 any cir-

cumstances short circuit the part.

• Exhaust and gas leakage caution:

Warning

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

2. Post-Service Checks

• Check parts for leaks:

Caution

Confirm that there are no gas, water, or exhaust leaks regardless of whether the

service performed could have caused them.

If the unit is installed indoors, check that the flue collar and vent pipe are installed

correctly 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:

Caution

After service or maintenance is completed, check that there are no combustibles in

the vicinity of the unit.

• Check insulation resistance:

Warning

After service or maintenance is completed, measure the resistance between the

electrical wires and ground. If it is less than 10MΩ, there is a risk of electrical

shock.

• Properly reconnect the power supply:

Warning

Confirm that the power supply has been reconnected properly after service or

maintenance is completed. Also confirm that there is no dust or other obstacles

that might cause an electric shock or a fire hazard.

1. Speciﬁcations/Performance Table

Speciﬁcations

Speciﬁcation

NR501-OD

Outdoor Wall Mounted

Direct Ignition

15-150 psi

0.5 GPM (2 L/min.)

32 lbs.

0.15 Gallon (0.5L)

3/4"

3/4”

1/2”

120 VAC (60Hz)

Zinciﬁed Steel Plate/Polyester Coating

Stainless Steel

Copper Sheeting, Copper Tubing

Stainless Steel Sheeting, Stainless Steel Tubing

Flame Rod, Thermal Fuse, Lightning Protection

Device (ZNR), Overheat Prevention Device, Freezing

Prevention Device, Fan Rotation Detector

Remote Controller, Remote Controller Cord,

Cross Recessed head screw

Item

Model Name

Type

Ignition

Operating Pressure

Minimum Flow Rate

Dimensions (Height) x (Width) x (Depth)

Weight

Water Holding Capacity

Accessories

Installation

Air Supply/Exhaust

Connection Sizes

Power Supply

Materials

Water Inlet

Hot Water Outlet

Gas Inlet

Condensate Drain

Safety Devices

Casing

Flue Collar

Primary Heat Exchanger

Secondary Heat Exchanger

Supply

Consumption

Power Vented

NG : 35W LP : 38W

Freeze Prevention 139W

20.5" (520mm) x 13.8"

(350mm) x 6.7" (170mm)

N/A

NR501-OD

NR662-OD

3

Speciﬁcation

NR662-OD

Outdoor Wall Mounted

Direct Ignition

15-150 psi

0.5 GPM (2 L/min.)

35 lbs.

0.15 Gallon (0.5L)

3/4"

3/4”

120 VAC (60Hz)

Zinciﬁed Steel Plate/Polyester Coating

Stainless Steel

Copper Sheeting, Copper Tubing

Stainless Steel Sheeting, Stainless Steel Tubing

Flame Rod, Thermal Fuse, Lightning Protection

Device (ZNR), Overheat Prevention Device, Freezing

Prevention Device, Fan Rotation Detector

Remote Controller, Remote Controller Cord,

Cross Recessed head screw

Item

Model Name

Type

Ignition

Operating Pressure

Minimum Flow Rate

Dimensions (Height) x (Width) x (Depth)

Weight

Water Holding Capacity

Accessories

Installation

Air Supply/Exhaust

Connection Sizes

Power Supply

Materials

Water Inlet

Hot Water Outlet

Gas Inlet

Condensate Drain

Safety Devices

Casing

Flue Collar

Primary Heat Exchanger

Secondary Heat Exchanger

Supply

Consumption

Power Vented

NG : 38W LP : 39W

Freeze Prevention 139W

20.5" (520mm) x 13.8"

(350mm) x 6.7" (170mm)

Speciﬁcation

NRC661-DV NRC661-OD

Indoor Wall Mounted Outdoor Wall Mounted

Direct Ignition

15-150 psi

0.5 GPM (2 L/min.)

38 lbs. 36 lbs.

0.2 Gallon (0.8L)

3/4"

3/4”

1/2”

1/2” Threaded

120 VAC (60Hz)

NG : 54W LP : 56W

Freeze Prevention 138W

Zinciﬁed Steel Plate/Polyester Coating

PVC Stainless Steel

Copper Sheeting, Copper Tubing

Stainless Steel Sheeting, Stainless Steel Tubing

Flame Rod, Thermal Fuse, Lightning Protection

Device (ZNR), Overheat Prevention Device, Freezing

Prevention Device, Fan Rotation Detector

Remote Controller, Remote Controller Cord,

Anchoring Screws, SV Conversion Kit, Neutralizer

Item

Model Name

Type

Ignition

Operating Pressure

Minimum Flow Rate

Dimensions (Height) x (Width) x (Depth)

Weight

Water Holding Capacity

Accessories

Installation

Air Supply/Exhaust

Connection Sizes

Power Supply

Materials

Water Inlet

Hot Water Outlet

Gas Inlet

Condensate Drain

Safety Devices

Casing

Flue Collar

Primary Heat Exchanger

Secondary Heat Exchanger

Supply

Consumption

Power Vented

NG : 43W LP : 42W

Freeze Prevention 139W

23.6" (600mm) x 13.8"

(350mm) x 6.7" (170mm)

20.5" (520mm) x 13.8"

(350mm) x 6.7" (170mm)

NRC661(-DV/-OD)

Speciﬁcation

NRC711-DV NRC711-OD

Indoor Wall Mounted Outdoor Wall Mounted

Direct Ignition

15-150 psi

0.5 GPM (2 L/min.)

41 lbs. 40 lbs.

0.2 Gallon (0.8L)

3/4"

3/4”

1/2” Threaded

120 VAC (60Hz)

NG : 71W LP : 72W

Freeze Prevention 138W

Zinciﬁed Steel Plate/Polyester Coating

PVC Stainless Steel

Copper Sheeting, Copper Tubing

Stainless Steel Sheeting, Stainless Steel Tubing

Flame Rod, Thermal Fuse, Lightning Protection

Device (ZNR), Overheat Prevention Device, Freezing

Prevention Device, Fan Rotation Detector

Remote Controller, Remote Controller Cord,

Anchoring Screws, SV Conversion Kit, Neutralizer

Item

Model Name

Type

Ignition

Operating Pressure

Minimum Flow Rate

Dimensions (Height) x (Width) x (Depth)

Weight

Water Holding Capacity

Accessories

Installation

Air Supply/Exhaust

Connection Sizes

Power Supply

Materials

Water Inlet

Hot Water Outlet

Gas Inlet

Condensate Drain

Safety Devices

Casing

Flue Collar

Primary Heat Exchanger

Secondary Heat Exchanger

Supply

Consumption

Power Vented

NG : 52W LP : 53W

Freeze Prevention 139W

23.6" (600mm) x 13.8"

(350mm) x 6.7" (170mm)

20.5" (520mm) x 13.8"

(350mm) x 6.7" (170mm)

NRC711(-DV/-OD)

4

Item

Gas

Consumption

Maximum Hot Water Capacity

Capacity Range

Temperature Settings

Default Temperature Options

NG

LP

45°F (25°C) Rise

Maximum Performance

120,000 btuh

Minimum Performance

15,000 btuh

4.2 GPM (16.0 L/min.)

0.5-5.0 GPM (2-19.0 L/min.)

115-140 °F (6 Options)

°F Mode:

°C Mode:

46-48°C (In 1°C intervals),

50,55,60°C (In 5°C intervals) (6 Options)

120°F (50°C), 130°F (54°C), 135°F (57°C),

140°F (60°C) (Original is 120

°F (50°C))

Performance

Item

Gas

Consumption

Maximum Hot Water Capacity

Capacity Range

Temperature Settings

Default Temperature Options

NG

LP

45°F (25°C) Rise

Maximum Performance

140,000 btuh

Minimum Performance

15,000 btuh

4.2 GPM (16.0 L/min.)

0.5-6.6 GPM (2-25.0 L/min.)

115-140°F (In 5°F intervals) (6 Options)

°F Mode:

°C Mode:

46-48°C (In 1°C intervals),

50,55,60°C (In 5°C intervals) (6 Options)

120°F (50°C), 130°F (54°C), 135°F (57°C)

140°F (60°C) (Original is 120

°F (50°C))

Item

Gas

Consumption

Maximum Hot Water Capacity

Capacity Range

Temperature Settings

Default Temperature Options

NG

LP

45°F (25°C) Rise

Maximum Performance

157,000 btuh

Minimum Performance

15,000 btuh

6.3 GPM (24.0 L/min.)

0.5-7.1 GPM (2-27.0 L/min.)

115-140°F (In 5°F intervals) (6 Options)

°F Mode:

°C Mode:

46-48°C (In 1°C intervals),

50,55,60°C (In 5°C intervals) (6 Options)

Item

Gas

Consumption

Maximum Hot Water Capacity

Capacity Range

Temperature Settings

Default Temperature Options

NG

LP

45°F (25°C) Rise

Maximum Performance

120,000 btuh

Minimum Performance

15,000 btuh

4.9 GPM (18.4 L/min.)

0.5-6.6 GPM (2-24.8 L/min.)

100-140°F (In 5°F intervals) (9 Options)

°F Mode:

°C Mode:

37-48°C (In 1°C intervals),

50,55,60°C (In 5°C intervals) (15 Options)

120°F (50°C), 135°F (57°C), 140°F (60°C)

(Original is 120°F (50°C))

120°F (50°C), 135°F (57°C), 140°F (60°C)

(Original is 120°F (50°C))

NR501-OD

5

NR662-OD

NRC661 (-DV/-OD)

NRC711 (-DV/-OD)

Hot Water Supply Capability

[Spring / Fall] Inlet water temp. 64F

80

90

100

110

120

130

140

150

160

0 1 2 3 4 5 6 7 8

Flow Rate [GPM]

Set temperature [F]

[Summer] Inlet water temp. 82F

80

90

100

110

120

130

140

150

160

0 1 2 3 4 5 6 7 8

Flow Rate [GPM]

Set temperature [F]

80

90

100

110

120

130

140

150

160

0 1 2 3 4 5 6 7 8

Flow Rate [GPM]

Set Tempearture [F]

[Winter] Inlet water temp. 48F

[Winter] Inlet water temp. 46 ℉

Flow Rate [GPM]

Set temperature [ ℉]

80

90

100

110

120

130

140

150

160

0 1 2 3 4 5 6 7 8

[Spring / Fall] Inlet water temp. 64 ℉

Flow Rate [GPM]

Set temperature [ ℉]

80

90

100

110

120

130

140

150

160

0 1 2 3 4 5 6 7 8

[Summer] Inlet water temp. 82 ℉

Flow Rate [GPM]

Set temperature [ ℉]

80

90

100

110

120

130

140

150

160

0 1 2 3 4 5 6 7 8

<NR501-OD>

<NRC661-DV / NRC661-OD>

[Spring / Fall] Inlet water temp. 64 ℉

80

90

100

110

120

130

140

150

160

0 1 2 3 4 5 6 7 8

Flow Rate [GPM]

Set temperature [ ℉]

[Summer] Inlet water temp. 82 ℉

80

90

100

110

120

130

140

150

160

0 1 2 3 4 5 6 7 8

Flow Rate [GPM]

Set temperature [ ℉]

[Winter] Inlet water temp. 46 ℉

80

90

100

110

120

130

140

150

160

0 1 2 3 4 5 6 7 8

Flow Rate [GPM]

Set temperature [ ℉]

<NR662-OD>

<NRC711-DV / NRC711-OD>

[Winter] Inlet water temp. 46 ℉

80

90

100

110

120

130

140

150

160

0 1 2 3 4 5 6 7 8

Flow Rate [GPM]

Set temperature [ ℉]

[Summer] Inlet water temp. 82 ℉

80

90

100

110

120

130

140

150

160

0 1 2 3 4 5 6 7 8

Flow Rate [GPM]

Set temperature [ ℉]

80

90

100

110

120

130

140

150

160

0 1 2 3 4 5 6 7 8

Flow Rate [GPM]

Set temperature [ ℉]

[Spring / Fall] Inlet water temp. 64℉

6

Pressure Loss Characteristics

7

<NR501-OD>

<NR662-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

Flow rate [GPM]

Pressure loss [psi]

0

10

20

30

40

50

60

Pressure loss [Ft. of head]

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

Flow rate [GPM]

Pressure loss [psi]

0

10

20

30

40

50

60

Pressure loss [Ft. of head]

0

5

10

15

20

25

30

35

40

0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0

Flow rate [GPM]

Pressure loss [psi]

0

10

20

30

40

50

60

70

80

90

Pressure loss [Ft. of head]

0

5

10

15

20

25

30

35

40

45

50

0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0

Flow rate [GPM]

Pressure loss [psi]

0

10

20

30

40

50

60

70

80

90

100

110

Pressure loss [Ft. of head]

8

<NRC661-DV, NRC661-OD>

<NRC711-DV, NRC711-OD>

13.1" (334mm)

13.8" (350mm)

1.7" (42mm)

2.2" (57mm)

20.5" (520mm)

7.0" (178mm)

2.9" (73mm)

AIR INLET

DISPLAY WINDOW

13.3" (338mm)

COLD WATER INLET

HOT WATER OUTLET

WATER DRAIN VALVE

WIRING THROUGHWAY

GAS INLET

(AC120V)

WIRING THROUGHWAY

(WATER FILTER)

WATER DRAIN VALVE

6.7" (170mm)

0.4" (11mm)

0.4" (10mm)

5.2" (133mm)

1.1" (27mm)

1.6" (40mm)

AIR INLET

2.0" (50mm)

3.3" (85mm)

4.7" (120mm)

0.4" (10mm)

21.3" (542mm)

19.2" (487mm)

1.2" (31mm)

0.3"×0.6" (3-6.5 16.5mm) OBLONG HOLE

2-0.3"×0.5" (6.5×13mm) OBLONG HOLE

< inch (mm) >

4- φ0.5" (φ13mm)

2.4" (60mm)

3.5" (90mm)

4.7" (120mm)

4- φ0.5" (φ13mm)

1.6" (40mm)

3.2" (80mm)

1.8" (45mm)

3.8" (97mm)

1.6" (40mm)

1.4" (36mm)

5.5" (139mm)

8.2" (208mm)

9.9" (252mm)

11.7" (296mm)

WIRING THROUGHWAY

(AC120V)

WIRING THROUGHWAY

GAS INLET (1/2")

COLD WATER INLET (3/4

")

(VIEW FROM TOP)

HOT WATER OUTLET (3/4")

HEIGHT OF EACH FITTING

FROM BOTTOM OF CASE

(NR501-OD)

HOT WATER OUTLET 1.8" (45mm)

COLD WATER INLET

1.9" (49mm)

GAS INLET

2.0" (50mm)

2. Dimensions

<NR501-OD>

1.5" (37mm)

AIR INLET

DISPLAY WINDOW

COLD WATER INLET

HOT WATER OUTLET

WATER DRAIN VALVE

WIRING THROUGHWAY

GAS INLET

(AC120V)

WIRING THROUGHWAY

(WATER FILTER)

WATER DRAIN VALVE

AIR INLET

13.1" (334mm)

13.8" (350mm)

1.7" (42mm)

2.2" (57mm)

20.5" (520mm)

8.4" (214mm)

13.3" (338mm)

6.7" (170mm)

0.4" (11mm)

0.4" (10mm)

5.2" (133mm)

1.1" (27mm)

1.6" (40mm)

2.0" (50mm)

3.3" (85mm)

4.7" (120mm)

0.4" (10mm)

21.3" (542mm)

19.2" (487mm)

1.2" (31mm)

3-0.3"×0.6" (6.5 16.5mm) OBLONG HOLE

2-0.3"×0.5" (6.5×13mm) OBLONG HOLE

< mm (inch) >

4- φ0.5" (φ13mm)

2.4" (60mm)

3.5" (90mm)

4.7" (120mm)

4- φ0.5" (φ13mm)

HEIGHT OF EACH FITTING

FROM BOTTOM OF CASE

(NR662-OD)

HOT WATER OUTLET 1.8" (45mm)

COLD WATER INLET

1.9" (49mm)

GAS INLET

2.0" (50mm)

1.6" (40mm)

3.2" (80mm)

1.8" (45mm)

3.8" (97mm)

1.6" (40mm)

1.4" (36mm)

5.5" (139mm)

8.2" (208mm)

9.9" (252mm)

11.7" (296mm)

WIRING THROUGHWAY

(AC120V)

WIRING THROUGHWAY

GAS INLET (3/4

")

COLD WATER INLET (3/4

")

(VIEW FROM TOP)

HOT WATER OUTLET (3/4")

<NR662-OD>

9

10

13.1" (334mm)

13.8" (350mm)

φ3.5" (φ89mm) φ3.5" (φ89mm)

5.9" (150mm) 4.9" (125mm)

23.6" (600mm)

AIR INLET

FLUE COLLAR

DISPLAY WINDOW

COLD WATER INLET

WATER DRAIN VALVE

HOT WATER OUTLET

CONDENSATE DRAIN

WIRING THROUGHWAY

GAS INLET

(AC120V)

WATER DRAIN VALVE

(WATER FILTER)

0.4" (10mm)

6.7" (170mm)

1.1" (28mm)

22.3" (567mm)

0.8" (21mm)

3.5" (90mm)

1.2" (31mm)

13.3" (338mm)

2.4" (60mm)

4.7" (120mm)

24.5" (622mm)

0.4" (10mm)0.4" (10mm)

2.0" (50mm)

4.7" (120mm)

3.5" (90mm)

3.3" (85mm)

3-0.3"×0.6" (6.5×16.5mm) OBLONG HOLE

4-φ0.5" (φ13mm)

2-0.3"×0.5" (6.5×13mm) OBLONG HOLE

4-φ0.5" (φ13mm)

< inch (mm) >

HEIGHT OF EACH FITTING

FROM BOTTOM OF CASE

NRC661-DV

CONDENSATE DRAIN 0.8" (20mm)

HOT WATER OUTLET 1.8" (45mm)

COLD WATER INLET 2.3" (58mm)

GAS INLET 2.0" (50mm)

0.8" (21mm)

1.8" (45mm)

3.4" (87mm)

3.8" (97mm)

1.2" (31mm)

3.8" (96mm)

4.1" (103mm)

10.0" (253mm)

1.6" (40mm)

11.7" (297mm)

(VIEW FROM TOP)

GAS INLET(1/2")

WIRING THROUGHWAY

COLD WATER INLET(3/4")

HOT WATER OUTLET(3/4")

CONDENSATE DRAIN(1/2")

0.4" (10mm)0.4" (10mm)

2.0" (50mm)

4.7" (120mm)

3.3" (85mm)

2-0.3"×0.5" (6.5×13mm) OBLONG HOLE

4-φ0.5" (φ13mm)

21.3" (542mm)

0.4" (10mm)

19.2" (487mm)

1.2" (31mm)

6.7" (170mm)

1.6" (40mm)

1.1" (27mm)

0.4" (11mm)

5.2" (133mm)

AIR INLET

2.4" (60mm)

4.7" (120mm)

3.5" (90mm)

3-0.3"×0.6" (6.5×16.5mm) OBLONG HOLE

4-φ0.5" (φ13mm)

WATER DRAIN VALVE

HOT WATER OUTLET

CONDENSATE DRAIN

WATER DRAIN VALVE

COLD WATER INLET

WIRING THROUGHWAY

GAS INLET

(AC120V)

WATER DRAIN VALVE

(WATER FILTER)

WIRING THROUGHWAY

DISPLAY WINDOW

AIR INLET

13.8" (350mm)

13.1" (334mm)

8.5" (217mm)

2.2" (56mm)1.1" (28mm)

20.5" (520mm)

1.1" (28mm)

13.3" (338mm)

< inch (mm) >

HEIGHT OF EACH FITTING

FROM BOTTOM OF CASE

NRC661-OD

CONDENSATE DRAIN 0.8" (20mm)

HOT WATER OUTLET 1.8" (45mm)

COLD WATER INLET 2.3" (58mm)

GAS INLET 2.0" (50mm)

COLD WATER INLET(3/4")

HOT WATER OUTLET(3/4")

0.8" (21mm)

1.8" (45mm)

3.4" (87mm)

3.8" (97mm)

1.2" (31mm)

3.8" (96mm)

4.1" (103mm)

10.0" (253mm)

8.2" (209mm)

1.9" (47mm)

1.6" (40mm)

11.7" (297mm)

(VIEW FROM TOP)

GAS INLET(1/2")

WIRING THROUGHWAY

CONDENSATE DRAIN(1/2")

WIRING THROUGHWAY

(AC120V)

<NRC661-DV>

<NRC661-OD>

<NRC711-DV>

<NRC711-OD>

11

13.1" (334mm)

13.8" (350mm)

φ3.5" (φ89mm) φ3.5" (φ89mm)

5.9" (150mm) 4.9" (125mm)

23.6" (600mm)

AIR INLET

FLUE COLLAR

DISPLAY WINDOW

COLD WATER INLET

WATER DRAIN VALVE

HOT WATER OUTLET

CONDENSATE DRAIN

WIRING THROUGHWAY

GAS INLET

(AC120V)

WATER DRAIN VALVE

(WATER FILTER)

0.4" (10mm)

6.7" (170mm)

1.1" (28mm)

22.3" (567mm)

0.8" (21mm)

3.5" (90mm)

1.2" (31mm)

13.3" (338mm)

2.4" (60mm)

4.7" (120mm)

24.5" (622mm)

0.4" (10mm)0.4" (10mm)

2.0" (50mm)

4.7" (120mm)

3.5" (90mm)

3.3" (85mm)

3-0.3"×0.6" (6.5×16.5mm) OBLONG HOLE

4-φ0.5" (φ13mm)

2-0.3"×0.5" (6.5×13mm) OBLONG HOLE

4-φ0.5" (φ13mm)

< inch (mm) >

HEIGHT OF EACH FITTING

FROM BOTTOM OF CASE

NRC711-DV

CONDENSATE DRAIN 0.8" (20mm)

HOT WATER OUTLET 1.8" (45mm)

COLD WATER INLET 2.3" (58mm)

GAS INLET 2.0" (50mm)

0.8" (21mm)

1.8" (45mm)

3.4" (87mm)

3.8" (97mm)

1.2" (31mm)

3.8" (96mm)

4.1" (103mm)

10.0" (253mm)

1.6" (40mm)

11.7" (297mm)

(VIEW FROM TOP)

GAS INLET(3/4")

WIRING THROUGHWAY

COLD WATER INLET(3/4")

HOT WATER OUTLET(3/4")

CONDENSATE DRAIN(1/2")

0.4" (10mm)0.4" (10mm)

2.0" (50mm)

4.7" (120mm)

3.3" (85mm)

2-0.3"×0.5" (6.5×13mm) OBLONG HOLE

4-φ0.5" (φ13mm)

21.3" (542mm)

0.4" (10mm)

19.2" (487mm)

1.2" (31mm)

6.7" (170mm)

1.6" (40mm)

1.1" (27mm)

0.4" (11mm)

5.2" (133mm)

AIR INLET

2.4" (60mm)

4.7" (120mm)

3.5" (90mm)

3-0.3"×0.6" (6.5×16.5mm) OBLONG HOLE

4-φ0.5" (φ13mm)

WATER DRAIN VALVE

HOT WATER OUTLET

CONDENSATE DRAIN

WATER DRAIN VALVE

COLD WATER INLET

WIRING THROUGHWAY

GAS INLET

(AC120V)

WATER DRAIN VALVE

(WATER FILTER)

WIRING THROUGHWAY

DISPLAY WINDOW

AIR INLET

13.8" (350mm)

13.1" (334mm)

8.5" (217mm)

2.2" (56mm)1.1" (28mm)

20.5" (520mm)

1.1" (28mm)

13.3" (338mm)

< inch (mm) >

HEIGHT OF EACH FITTING

FROM BOTTOM OF CASE

NRC711-OD

CONDENSATE DRAIN 0.8" (20mm)

HOT WATER OUTLET 1.8" (45mm)

COLD WATER INLET 2.3" (58mm)

GAS INLET 2.0" (50mm)

COLD WATER INLET(3/4")

HOT WATER OUTLET(3/4")

0.8" (21mm)

1.8" (45mm)

3.4" (87mm)

3.8" (97mm)

1.2" (31mm)

3.8" (96mm)

4.1" (103mm)

10.0" (253mm)

8.2" (209mm)

1.9" (47mm)

1.6" (40mm)

11.7" (297mm)

(VIEW FROM TOP)

GAS INLET(3/4")

WIRING THROUGHWAY

CONDENSATE DRAIN(1/2")

WIRING THROUGHWAY

12

<NR501-OD>

Thermistor-Cold Water

Thermistor-Hot Water

Manifold Pressure Tap

Thermistor-Cold Water

Thermistor-Hot Water

Manifold Pressure Tap

3. Components

<NR662-OD>

Thermistor-Cold Water

Thermistor-Hot Water

Manifold Pressure Tap

Thermistor-Cold Water

Thermistor-Hot Water

Manifold Pressure Tap

<NRC661-DV>

<NRC661-OD>

13

<NRC711-DV>

14

<NRC711-OD>

Thermistor-Cold Water

Thermistor-Hot Water

Manifold Pressure TapManifold Pressure Tap

Thermistor-Cold Water

Thermistor-Hot Water

Manifold Pressure Tap

The display window allows you to view the status

of unit or error codes.

Display Window

When other indication will appear, please refer to troubleshooting(Owner's guide).

(Ex.NRC661-DV)

(Display Window)

When the gas burner is on.

When the gas burner is on, set

temperature is

displayed for one minute.

When hot water ﬂows.

If there is a problem with the unit, a numerical

error code will ﬂash.

When unit is initially plugged into power,

set temperature is displayed for approx. three minutes.

(When the gas burner is off, and cold water ﬂows.)

After one minute elapses from initial call for hot water, the outside edge of

the three digit display will rotate in a circular pattern.

On

(Ex.: error code 11)

15

Thermistor-Cold Water

Thermistor-

Hot Water

Gas Proportioning Valve

4. Operating Principle

16

<NR501-OD, NR662-OD>

Thermistor-Cold Water

Thermistor-

Hot Water

Gas Proportioning Valve

17

< How to Use >

1.Normal Operation

(Hot Water Production)

1. Turn the unit on.

- If an optional remote controller is not installed with the unit, the unit will be on as soon as

electricity is connected to it.

*When electrical power is connected to the unit, the Set Temperature is displayed for

approx. 3 minutes on the Display Window.

- If a remote controller is installed, the "POWER" button will need to be pushed to turn

the unit on.

2. Whenever a hot water fixture is opened, or an appliance that requires hot water is turned

on, as soon as the flow sensor detects at least the minimum flow rate required combustion,

the fan will iniate and pre-purge any residual combustibles in the combustion chamber.

The igniter will then create a spark and the gas valves will open allowing fuel into

the combustion chamber where it be ignited by the spark.

3. When the flame rod detects a flame, the igniter will stop sparking.

4. The computer will then control the gas and water control valves to maintain the water at

the temperature setting. The temperature can be adjusted by DIP switches on the Display

Window circuit board, or by changing the remote controller setting if one is installed.

5. When the demand for hot water ceases, the unit will stop heating.

When the flow sensor detects that the rate has dropped below the minimum rate for

continued burning, the gas valves will close and the burner flame will go out. After the post

purge removes residual gas from combustion chamber, the unit stops.

If necessary, turn off the power by either disconnecting the power supply, or pressing

the "POWER" button on the remote controller if one is installed.

2. Error Codes

If the flame rod does not detect a flame, or if the high limit switch has been triggered,

the gas valves will close, the flame will go out, and an error code will flash on

the Display Window or the Optional Remote Controller if one installed.

In order to reset the unit and remove the error code, turn the power off by either

disconnecting the power supply or by pressing the "POWER" on the Optional Remote

Controller, and then press it again to turn the unit back on.

If the problem requires service (the thermal fuse is triggered,etc) the gas valve will stay

closed and resetting the unit will not eliminate the error code. If this is the case, the unit

must be serviced before it will work again.

3. Miscellaneous

If the unit will not be used for a long period of time, turn off the power, drain the unit

of water, and close the manual gas valve on the supply line.

18

19

5. Operation Flow Chart

Water heating

Shutdown procedure

Ignition operation

<NR501-OD>

Water heating

Shutdown procedure

Ignition operation

20

<NR662-OD>

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