Noritz NRC83-DV User manual

1
NORITZ America Corporation
Gas Water Heater
NRC83 (-DV, -OD)
NRC98 (-DV, -OD)
NRC1111/NCC1991(-DV,-OD)
NR981/NC199(-DVC,-OD,-SV)
NR83-DVC
Field 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: October, 2012
Contents
Important Safety Information.................................................................................................... 2
1. Features.............................................................................................................................. 3
2. Specifications/Performance Table....................................................................................... 4
3. Dimensions......................................................................................................................... 7
4. Components ....................................................................................................................... 9
5. Troubleshooting.................................................................................................................. 26
•Error Codes and Checkpoints......................................................................................... 26
•Remote Controller........................................................................................................... 27
•Displaying Maintenance Monitors ................................................................................... 27
•Maintenance Monitor List................................................................................................29
•Gas Line Requirements...................................................................................................26
• Water Treatment ............................................................................................................. 32
• Periodic lnspection ......................................................................................................... 33
• Periodic Maintenance ..................................................................................................... 34
•Changing Default Temperature Setting........................................................................... 36
6. Installation Check.............................................................................................................. 40
KS-11-0004

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.
•Modi cation 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 eh tr eh t ehwf osse l d r age rskae l t suahxer o, r e t aw, sagone r ae r eh tt ah tmr r i f noC 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.
2

1. Features
1. Quick Connect Multi System
•Allows the simple installation of up to 2 units linked together using a Quick Connect Cord
CCP Valve
System controller
2. 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.
3. Temperature Lockout Function
•The remote controller can be set to restrict the maximum allowable temperature setting for added safety.
See "Changing Default Temperature Setting" section for details.
4. Elevation Adjustment
• The water heater can be quickly configured for installations above 2000' by simply adjusting dip switches inside
of the unit. No additional equipment or adjustments are necessary. See the "Installation Manual" for details.
Not required
3

2. Specifications/Performance Table
Specifications
Specification
NRC98-DV NRC98-OD
Indoor Wall Mounted Outdoor Wall Mounted
Direct Ignition
15-150 psi
0.5 GPM (2 L/min.)
24.2" (615mm) x 18.3" (464mm) x 9.4" (240mm)
58 lbs. 57 lbs.
0.5 Gallon (1.8L)
3/4"
3/4”
3/4”
1/2” Threaded
120 VAC (60Hz)
NG : 73W LP : 78W
Freeze Prevention 213W
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
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 : 64W LP : 68W
Freeze Prevention 203W
Specification
Direct Ignition
15-150 psi
0.5 GPM (2 L/min.)
24.2" (615mm) x 18.3" (464mm) x 9.4" (240mm)
58 lbs. 57 lbs.
0.5 Gallon (1.8L)
3/4"
3/4”
3/4”
1/2” Threaded
120 VAC (60Hz)
NG : 58W LP : 64W
Freeze Prevention 213W
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
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
NRC83-DV NRC83-OD
Indoor Wall Mounted Outdoor Wall Mounted
Power Vented
NG : 51W LP : 54W
Freeze Prevention 203W
NRC98(-DV/-OD)
NRC83(-DV/-OD)
4

NRC1111(-DV,-OD)/ NCC1991(-DV,-OD)
Installation Indoor/Outdoor,
Wall Mounted
Indoor/Outdoor,
Wall Mounted
Air Supply/Exhaust
Connection Sizes Water Inlet
Hot Water Outlet
Gas Inlet
Power Supply Supply
NG : 81W NG : 78W
LP : 83W LP : 80W
Materials Casing
Flue Collar
Heat Exchanger
0.5 GPM
24.4"(Height) x 18.3"(Width) x 9.4"(Depth)
66 lbs.
0.5 Gallon
3/4"
Power Vented
Direct Ignition
15-150 psi
NRC1111-OD
NCC1991-OD
Type
Item
Ignition
Operating Pressure
NRC1111-DV
NCC1991-DV
68 lbs.
3/4"
3/4"
120 VAC (60Hz)
Freeze Prevention 223W
PVC
Copper Sheeting, Copper Tubing
Flame Rod, Thermal Fuse, Lightning Protection Device (ZNR), Overheat Prevention
Device, Freeze Prevention Device, Fan Rotation Detector
Anchoring Screws
Model Name
Safety Devices
Accessories
Minimum Flow Rate
Dimensions
Weight
Water Holding Capacity
Consumption
Installation
Outdoor,
Wall Mounted
Air Supply/Exhaust
23.6"(Height) x 13.8"(Width) x
11.0"(Depth)
54 lbs. 58 lbs.
Water Inlet
Hot Water Outlet
Gas Inlet
Supply
NG : 65W NG : 65W NG : 80W
LP : 69W LP : 67W LP : 83W
Casing
Flue Collar
Heat Exchanger
Anchoring Screws
Item
Model Name
Type
Ignition
Operating Pressure
Water Holding Capacity
Safety Devices
Accessories
Connection Sizes
Power Supply
Consumption
Materials
0.5 GPM
NR981-OD
NC1991-OD
NR981-DVC
NC1991-DVC
Dimensions
Weight
Minimum Flow Rate
Indoor,
Wall Mounted
Power Vented
NR981-SV
Direct Ignition
15-150 psi
Copper Sheeting, Copper Tubing
Flame Rod, Thermal Fuse, Lightning Protection Device (ZNR), Overheat Prevention Device, Freeze
Prevention Device, Fan Rotation Detector
23.6"(Height) x 13.8"(Width) x
9.4"(Depth)
Freeze Prevention 161W
3/4"
3/4"
3/4"
120 VAC (60Hz)
Stainless Steel
0.2 Gallon
Freeze Prevention 193W
Remote Controller, Remote Controller Cord, Anchoring Screws
NR981-SV
Outdoor,
Wall Mounted
NR981(-SV,-OD,-DVC)/ NC1991(-OD,-DVC)
5

Specification
NR83-DVC
Indoor Wall Mounted
Power Vented
Direct Ignition
15-150 psi
0.5 GPM (2 L/min.)
23.6" (600mm) x 13.8" (350mm) x 9.4" (240mm)
49 lbs.
0.2 Gallon (0.95L)
3/4"
3/4"
3/4"
120 VAC (60Hz)
NG : 82W LP : 90W Freeze Prevention 161W
Zincified Steel Plate/Polyester Coating
Stainless Steel
Copper Sheeting, Copper Tubing
Flame Rod, Thermal Fuse, Lightning Protection
Device (ZNR), Overheat Prevention Device, Freezing
Prevention Device, Fan Rotation Detector
Anchoring Screws
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
Safety Devices
Casing
Flue Collar
Heat Exchanger
Supply
Consumption
NR83-DVC
6

Performance
Maximum Performance
Minimum Performance
Maximum Hot Water Capacity 45°F Rise
Default Temperature Options 120, 130, 140°F (Original is 120°F) 120, 130, 140, 185°F (Original is 120°F)
Temperature Settings (Using the Remote Controller) 100 - 140°F (In 5°F intervals),
(9 Options) 100 - 150°F (In 5°F intervals), 160, 170, 185°F (14 Options)
NRC1111-DV NRC1111-OD NCC1991-DV
Gas Consumption NG : 199,900 btuh LP : 199,900 bt
uh
NG : 16,000 btuh LP : 16,000 btu
h
8.4 Gal./min.
Capacity Range
Item
0.5 - 11.1 Gal./min.
NCC1991-OD
Maximum Performance
Minimum Performance
Maximum Hot Water Capacity 45°F Rise
Default Temperature Options 120, 130, 140°F (Original is 120°F) 120, 130, 140, 185°F (Original is 12
0°F)
Temperature Settings (Using the Remote Controller) 100 - 140°F (In 5°F intervals),
(9 Options) 100 - 150°F (In 5°F intervals), 160, 170, 185°F (14 Options)
NC1991-DVC
Gas Consumption NG : 199,900 btuh LP : 199,900 bt
uh
NG : 16,000 btuh LP : 16,000 btu
h
7.5 Gal./min.
Capacity Range
Item
0.5 - 9.8 Gal./min.
NC1991-OD
NR981-DVC / NR981-OD / NR981-SV
Item
Gas
Consumption
Maximum Hot Water Capacity
Capacity Range
Temperature Settings
Default Temperature Options
Maximum Performance
Minimum Performance
45°F (25°C) Rise
NRC98-DV
NG : 180,000 btuh LP : 180,000 btuh
NRC98-OD
NG : 16,000 btuh LP : 16,000 btuh
7.5 GPM (28.2 L/min.)
0.5-9.8 GPM (2-37.0 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), 130°F (55°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
Maximum Performance
Minimum Performance
45°F (25°C) Rise
NRC83-DV
NG : 157,000 btuh LP : 157,000 btuh
NRC83-OD
NG : 16,000 btuh LP : 16,000 btuh
6.6 GPM (25.0 L/min.)
0.5-8.3 GPM (2-31.4 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), 130°F (55°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
Maximum Performance
Minimum Performance
45°F (25°C) Rise
NR83-DVC
NG : 180,000 btuh LP : 180,000 btuh
NG : 18,000 btuh LP : 18,000 btuh
6.7 GPM (25.4 L/min.)
0.5-8.3 GPM (2-31.4 L/min.)
100-140°F (In 5°F intervals) (9 Options)
50,55,60°C (Original is 50°C)
120,130,140°F (Original is 120°F)
°F Mode:
°F Mode:
°C Mode:
°C Mode:
37-48°C (In 1°C intervals),
50,55,60°C (In 5°C intervals) (15 Options)
7

Hot Water Supply Capabillities
[Winter] Inlet water temp. 46 F [Spring/Fall] Inlet water temp. 64 F [Summer] Inlet water temp. 82 F
Set temperature ( F)
Set temperature ( F)
800 1 2 3 4 5 6 7 8
90
100
110
120
130
140
150
160
170
180
Flow Rate (GPM)
80 0 1 2 345 6 7 8 9 10
90
100
110
120
130
140
150
160
170
180
Flow Rate (GPM)
80 0 1 2 3 4 5 6 7 8 9 10
90
100
110
120
130
140
150
160
170
180
Set temperature ( F)
Flow Rate (GPM)
[Winter] Inlet water temp. 46 F [Spring/Fall] Inlet water temp. 64 F [Summer] Inlet water temp. 82 F
Set temperature ( F)
Set temperature ( F)
800 1 2 3 4 5 6 7 8
90
100
110
120
130
140
150
160
170
180
Flow Rate (GPM)
80 0 1 2 345 6 7 8 9 10
90
100
110
120
130
140
150
160
170
180
Flow Rate (GPM)
80 0 1 2 3 4 5 6 7 8 9 10
90
100
110
120
130
140
150
160
170
180
Set temperature ( F)
Flow Rate (GPM)
< NRC83 Series >
< NRC98 Series >
<NCC1991-DV,NCC1991-OD>
9 10 11 12
Set temperature ( F)
800 1 2 345 6 7 8
90
100
110
120
130
140
150
160
170
180
190
Flow Rate (GPM)
[Spring / Fall] Inlet water temp. 64 F
9 10 11 12
Set temperature ( F)
800 1 2 345 6 7 8
90
100
110
120
130
140
150
160
170
180
190
Flow Rate (GPM)
[Summer] Inlet water temp. 82 F
Set temperature ( F)
800 1 2 345 6 7 8 9 10 11 12
90
100
110
120
130
140
150
160
170
180
190
Flow Rate (GPM)
[Winter] Inlet water temp. 46 F
9 10 11 12
Set temperature ( F)
800 1 2 345 6 7 8
90
100
110
120
130
140
150
160
170
180
190
Flow Rate (GPM)
[Spring / Fall] Inlet water temp. 64 F
9 10 11 12
Set temperature ( F)
800 1 2 3 4 5 6 7 8
90
100
110
120
130
140
150
160
170
180
190
Flow Rate (GPM)
[Summer] Inlet water temp. 82 F
<NRC1111-DV,NRC1111-OD>
Set temperature ( F)
800 1 2 345 6 7 8 9 10 11 12
90
100
110
120
130
140
150
160
170
180
190
Flow Rate (GPM)
[Winter] Inlet water temp. 46 F
<NC1991-OD, NC1991-DVC>
190
[Winter] Inlet water temp. 46 F
Flow Rate (GPM)
80 0 1 2 3 4 5 6 7 8 9 10 11 12
90
130
140
150
160
170
180
120
110
100
Flow Rate (GPM)
[Spring / Fall] Inlet water temp. 64 F
800 1 3 4 5 6 7 8 9 10 11 12
90
130
140
150
160
170
180
120
110
100
Flow Rate (GPM)
[Spring / Fall] Inlet water temp. 64 F
800 1 3 4 5 6 7 8 9 10 11 12
90
130
140
150
160
170
180
120
110
100
2
190
Flow Rate (GPM)
190
[Summer] Inlet water temp. 82 F
800 1 2 3 4 5 6 7 8 9 10 11 12
90
130
140
150
160
170
180
120
110
100
8

Hot Water Supply Capabillities
Pressure Loss Characteristics
< NRC98 Series >
< NRC83 Series >
<NR981-OD, NR981-DVC, NR981-SV>
190
[Winter] Inlet water temp. 46 F
80 0123456789101112
90
130
140
150
160
170
180
120
110
100
Flow Rate (GPM)
190
[Spring / Fall] Inlet water temp. 64 F
80 0123456789101112
90
130
140
150
160
170
180
120
110
100
Flow Rate (GPM)
190
[Summer] Inlet water temp. 82 F
80 0123456789101112
90
120
110
100
130
140
150
120
160
170
180
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 12.0
Flow rate [GPM]
Pressure loss [psi]
0
10
20
30
40
50
60
Pressure loss [Ft. of head]
Bypass Flow Control Valve Close
Set temperature : 125F or higher
(Storage Tank Setting W/ System
Controller : 170-185 F)
Bypass Flow Control Valve Open
Set temperature : 120F or less
(Storage Tank Setting W/ System
Controller : 160 F or less)
<NRC1111/NCC1991>
1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0
Flow Rate (GPM)
0
10
20
30
40
50
60
70
80
Pressure Loss (Ft. of head)
Bypass flow control valve Open
Set temperature : 120ﾟF or less
(storage Tank Setting W/ System
Controller : 160ﾟF or less)
Bypass flow control valve Close
Set temperature : 125ﾟF or higher
storage Tank Setting W/ System
Controller : 170-185ﾟF)
<NR981/NC1991>
[Winter] Inlet water temp. 46 F [Spring/Fall] Inlet water temp. 64 F [Summer] Inlet water temp. 82 F
Set temperature ( F)
Set temperature ( F)
80012345678
90
100
110
120
130
140
150
160
170
180
Flow Rate (GPM)
80 01234567810
90
100
110
120
130
140
150
160
170
180
Flow Rate (GPM)
Set temperature ( F)
80 01234567810
90
100
110
120
130
140
150
160
170
180
Flow Rate (GPM)
<NR83-DVC>
9

10
15
20
25
30
35
Pressure Loss (psi)
0
5
10
15
20
25
30
35
0.0 2.0 4.0 6.0 8.0 10.0
Pressure Loss (psi)
Flow Rate (GPM)
< NR83-DVC>
10

HEIGHT OF EACH FITTING
FROM BOTTOM OF CASE
CONDENSATE DRAIN
HOT WATER OUTLET
COLD WATER INLET
GAS INLET
0.9" (24mm)
1.8" (45mm)
1.9" (49mm)
2.2" (56mm)
(VIEW FROM TOP)
6.6" (168mm)
5.9" (149mm)
2.0" (50mm)
12.6" (320mm)
7.0" (179mm)
3.6" (93mm)
4.1" (104mm)
5.6" (142mm)
6.1" (155mm)
HOT WATER OUTLET (3/4")
CONDENSATE DRAIN (1/2")
WIRING THOROUGHWAY
2.3" (66mm)
5.4" (137mm)
9.6" (244mm)
GAS INLET (3/4")
WIRING THOROUGHWAY
(AC120V)
COLD WATER INLET (3/4")
WIRING THOROUGHWAY
CONDENSATE DRAIN
WATER DRAIN VALVE
WATER DRAIN VALVE
(WATER FILTER)
HOT WATER OUTLET
WATER DRAIN VALVE
WIRING THOROUGHWAY
(AC120V)
GAS INLET
COLD WATER INLET
Ø 4.5" (114mm)
Ø 3.5" (89.5mm)
AIR INLET
24.2" (615mm)
Ø 4.5" (114mm)
Ø 3.5" (89.5mm)
FLUE COLLAR
< inch (mm)>
17.7" (450mm)
18.3" (464mm)
17.6" (448mm)
5.9" (150mm) 9.1" (232mm)
4-Ø0.5" (13mm)
6- 0.24" x 0.4" (6mm x 10mm) OBLONG HOLE
6.7" (170mm) 5.5" (140mm)
3.9" (100mm)
2.8" (70mm)
1.4" (36mm)
6.7" (170mm)
5.5" (140mm)
3.9" (100mm)
2.8" (70mm)
1.4" (36mm)
1.6" (40mm)
2.4" (61mm)
5.5" (140mm)
9.4" (240mm)
1.1" (28mm)
26.2" (665mm)
23.1" (586mm)
0.4" (10mm)
4-Ø0.5" (13mm)
6- 0.24" x 0.4" (6mm x 10mm) OBLONG HOLE
0.4" (10mm)
(VIEW FROM TOP)
NRC98-DV
NRC83-DV
HEIGHT OF EACH FITTING
FROM BOTTOM OF CASE
CONDENSATE DRAIN
HOT WATER OUTLET
COLD WATER INLET
1.9" (49mm)
1.8" (45mm)
0.8" (20mm)
6.6" (168mm) 5.9" (149mm) 4.1" (104mm) 5.6" (142mm) 6.1" (155mm)
2.2" (55mm)
2.0" (50mm)
14.0" (355mm)
12.6" (320mm)
7.0" (179mm)
3.6" (93mm)
(VIEW FROM TOP)
WIRING THOROUGHWAY
CONDENSATE DRAIN(1/2")
HOT WATER OUTLET(3/4")
WIRING THOROUGHWAY
(AC120V)
GAS INLET(3/4")
WIRING THOROUGHWAY
COLD WATER INLET(3/4")
2.3" (66mm)
5.4" (137mm) 9.6" (244mm)
HEIGHT OF EACH FITTING
4- Ø0.5"(Ø13mm)
6- 0.24" x 0.4" (6 x10mm) OBLONG HOLE
6.7" (170mm)
3.9" (100mm)
2.8" (70mm)
1.4" (36mm)
6.7" (170mm)
3.9" (100mm)
2.8" (70mm)
1.4" (36mm)
0.4" (10mm) 9.4" (240mm) 0.5" (13mm)
1.1" (28mm)
17.7" (450mm)
1.6" (40mm)23.1" (586mm)
24.2" (615mm)
2.4" (61mm)2.1" (53mm)
26.2" (665mm)
4- Ø0.5"(Ø13mm)
6- 0.24" x 0.4" (6 x10mm) OBLONG HOLE
0.4" (10mm)
AIR INLET AIR INLET
18.3" (464mm)
17.6" (448mm)
10.5" (267mm) 3.9" (99mm)
< mm [inch] >
WIRING THOROUGHWAY
(AC120V)
GAS INLET
COLD WATER INLET
WATER DRAIN VALVE
WATER DRAIN VALVE
HOT WATER OUTLET
CONDENSATE DRAIN
WATER DRAIN VALVE
(WATER FILTER)
FLUE COLLAR
5.5" (140mm)
5.5" (140mm)
NRC98-OD
NRC83-OD
3. Dimensions
11
GAS INLET
2.2" (65mm)
WIRING THOROUGHWAY WIRING THOROUGHWAY

NCC1991-DV
LED
24.4" (619mm)
< inch (mm) >
WATER DRAIN VALVE
COLD WATER INLET
WATER DRAIN VALVE
HOT WATER OUTLET
WATER DRAIN VALVE
CONDENSATE DRAIN
WIRING THOROUGHWAY
GAS INLET
(WATER FILTER)
WATER DRAIN VALVE
WIRING THOROUGHWAY
(AC120V)
4 - Ø0.5" (Ø13mm)
6 - 0.24" x 0.4" (6 x 10mm) OBLONG HOLE
6.7" (170mm)
5.5" (140mm)
3.9" (100mm)
2.8" (70mm)
1.4" (36mm) 0.4" (10mm)
1.4" (36mm)
2.8" (70mm)
3.9" (100mm)
5.5" (140mm)
6.7" (170mm)
4 - Ø0.5" (Ø13mm)
6 - 0.24" x 0.4" (6 x 10mm) OBLONG HOLE
1.6" (40mm) 2.4" (61mm)
0.4" (10mm) 9.4" (240mm)
5.5" (140mm) 1.1" (29mm)
26.2" (665mm) 23.1" (586mm)
17.7" (450mm)
18.4" (468mm)
17.6" (448mm)
5.9" (150mm) 9.2" (234mm)
Ø4.5" (Ø114mm)
Ø3.5" (Ø89mm) Ø4.5" (Ø114mm) Ø3.5" (Ø89mm)
AIR INLET FLUE COLLAR 2.2" (56mm)
2.2" (55mm)
1.7" (44mm)
0.8" (20mm)
NCC1991-DV
GAS INLET
COLD WATER INLET
HOT WATER OUTLET
CONDENSATE DRAIN
FROM BOTTOM OF CASE
HEIGHT OF EACH FITTING
(VIEW FROM TOP)
5.3" (135mm)
2.8" (71mm)
6.7" (171mm)
7.0" (177mm)
WIRING THOROUGHWAY
(AC120V)
8.4" (214mm)
10.0" (255mm)
3.9" (99mm)
2.8" (70mm)
6.1" (155mm) 4.3" (109mm)
2.4" (60mm)
14.2" (362mm)
5.7" (146mm)
3.9" (98mm)
HOT WATER OUTLET (3/4")
CONDENSATE DRAIN (1/2")
WIRING THOROUGHWAY
COLD WATER INLET (3/4")
GAS INLET (3/4")
WATER DRAIN VALVE
CONDENSATE DRAIN
WIRING THOROUGHWAYS
COLD WATER INLET
WATER DRAIN VALVE
HOT WATER OUTLET
WIRING THOROUGHWA
(AC120V)
WATER DRAIN VALVE
GAS INLET
(WATER FILTER)
WATER DRAIN VALVE
6.7" (170mm)
5.5" (140mm)
3.9" (100mm)
2.8" (70mm)
1.4" (36mm)
AIR INLET
FLUE COLLAR
AIR INLET
LED
(VIEW FROM TOP)
COLD WATER INLET (3/4")
GAS INLET (3/4")
14.2" (362mm)
5.7" (146mm)
3.9" (98mm)
HOT WATER OUTLET (3/4")
CONDENSATE DRAIN (1/2")
WIRING THOROUGHWAYS
2.2" (56mm)
2.2" (55mm)
1.7" (44mm)
0.8" (20mm)
NCC1991-OD
GAS INLET
COLD WATER INLET
HOT WATER OUTLET
CONDENSATE DRAIN
FROM BOTTOM OF CASE
HEIGHT OF EACH FITTING
4 - Ø0.5" (Ø13mm)
6 - 0.24" x 0.4" (6 x 10mm) OBLONG HOLE
0.4" (10mm)
4 - Ø0.5" (Ø13mm)
6 - 0.24" x 0.4" (6 x 10mm) OBLONG HOLE
1.4" (36mm)
2.8" (70mm)
3.9" (100mm)
5.5" (140mm)
6.7" (170mm)
1.6" (40mm)
0.4" (10mm) 9.4" (240mm) 0.5" (13mm)
1.1" (29mm)
26.2" (665mm) 23.1" (586mm)
17.7" (450mm)
18.4" (468mm)
10.5" (267mm)
17.6" (448mm) 4.0" (101mm)
2.5" (63mm)
2.1" (53mm)
24.4" (619mm)
< inch (mm) >
WIRING THOROUGHWAY
(AC120V)
8.4" (214mm)
10.0" (255mm)
3.9" (99mm)
2.8" (70mm)
5.3" (135mm)
2.8" (71mm)
6.7" (171mm) 7.0" (177mm)
6.1" (155mm)
4.3" (109mm)
2.4" (60mm)
NCC1991-OD
12

NRC1111-DV
WATER DRAIN VALVE
COLD WATER INLET
WATER DRAIN VALVE
HOT WATER OUTLET
WATER DRAIN VALVE
CONDENSATE DRAIN
WIRING THOROUGHWAY
GAS INLET
(WATER FILTER)
WATER DRAIN VALVE
WIRING THOROUGHWA
(AC120V)
AIR INLET FLUE COLLAR
6.7" (170mm)
5.5" (140mm)
3.9" (100mm)
2.8" (70mm)
1.4" (36mm) 0.4" (10mm)
4 - Ø0.5" (Ø13mm)
6 - 0.24" x 0.4" (6 x 10mm) OBLONG HOLE
1.6" (40mm)
26.2" (665mm) 23.1" (586mm)
24.2" (615mm)
2.4" (61mm)
0.4" (10mm) 9.4" (240mm)
5.5" (140mm) 1.1" (28mm) Ø4.5" (Ø114mm)
Ø3.5" (Ø89mm)
17.7" (450mm)
18.3" (464mm)
17.6" (448mm)
5.9" (150mm) 9.1" (232mm) Ø4.5" (Ø114mm)
Ø3.5" (Ø89mm)
< inch (mm) >
4 - Ø0.5" (Ø13mm)
6 - 0.24" x 0.4" (6 x 10mm) OBLONG HOLE
6.7" (170mm)
5.5" (140mm)
3.9" (100mm)
2.8" (70mm)
1.4" (36mm)
(VIEW FROM TOP)
HOT WATER OUTLET (3/4")
CONDENSATE DRAIN (1/2")
WIRING THOROUGHWAY
WIRING THOROUGHWAY
COLD WATER INLET (3/4")
GAS INLET (3/4")
2.2" (56mm)
2.2" (55mm)
1.7" (44mm)
0.8" (20mm)
NRC1111-DV
GAS INLET
COLD WATER INLET
HOT WATER OUTLET
CONDENSATE DRAIN
FROM BOTTOM OF CASE
HEIGHT OF EACH FITTING
5.3" (135mm)
6.1" (155mm) 4.3" (109mm)
2.4" (60mm)
6.7" (171mm) 7.0" (177mm)
8.4" (214mm)
3.9" (99mm)
2.8" (70mm)
14.2" (362mm)
5.7" (146mm)
3.9" (98mm) (AC120V)
WIRING THOROUGHWA
(AC120V)
WATER DRAIN VALVE
GAS INLET
(WATER FILTER)
WATER DRAIN VALVE
AIR INLET
AIR INLET
WATER DRAIN VALVE
CONDENSATE DRAIN
WIRING THOROUGHWAYS
COLD WATER INLET
WATER DRAIN VALVE
HOT WATER OUTLET
< inch [mm] >
4 - Ø0.5" (Ø13mm)
6 - 0.24" x 0.4" (6 x 10mm) OBLONG HOLE
4 - Ø0.5" (Ø13mm)
6 - 0.24" x 0.4" (6 x 10mm) OBLONG HOLE
1.4" (36mm)
2.8" (70mm)
3.9" (100mm)
5.5" (140mm)
6.7" (170mm)
6.7" (170mm)
5.5" (140mm)
3.9" (100mm)
2.8" (70mm)
1.4" (36mm) ) m m 4 4("7.1) mm 0 1( "4.0
26.2" (665mm) 23.1" (586mm)
24.2" (615mm) 24.0" (611mm)
2.4" (61mm)2.1" (53mm)
1.6" (40mm)
0.4" (10mm) 9.4" (240mm) 0.5" (13mm)
1.1" (28mm)
1.6" (42mm)
17.7" (450mm)
18.3" (464mm)
10.5" (267mm)
16.9" (428mm)
3.9" (99mm)
17.6" (448mm)
FLUE COLLAR
(VIEW FROM TOP)
WIRING THOROUGHWAY
(AC120V)
5.3" (135mm)
2.8" (71mm)
6.7" (171mm)
7.0" (177mm)
COLD WATER INLET (3/4")
GAS INLET (3/4")
14.2" (362mm)
5.7" (146mm)
3.9" (98mm)
HOT WATER OUTLET (3/4")
CONDENSATE DRAIN (1/2")
WIRING THOROUGHWAYS
6.1" (155mm) 4.3" (109mm)
2.4" (60mm)
3.9" (99mm)
2.8" (70mm)
8.4" (214mm)
10.0" (255mm)
2.2" (56mm)
2.2" (55mm)
1.7" (44mm)
0.8" (20mm)
NRC1111-OD
GAS INLET
COLD WATER INLET
HOT WATER OUTLET
CONDENSATE DRAIN
FROM BOTTOM OF CASE
HEIGHT OF EACH FITTING
NRC1111-OD
13

NR981-DVC
NC1991-DVC
NR981-OD
NC1991-OD
14
79 [ 3.1"]
127[ 5.0"]
334 [13.1"]
350 [13.8"]
600
[23.6"]
FLUE COLLAR
AIR INLET
CONDENSATE DRAIN
336 [13.2"]
567
[22.3"]
113
[4.4"]
102
[4.0"]
10 ～45[0.4"～1.8"] 280 [11.0"]
28 [1.1"]
10 ～45[0.4"～1.8"]
120 [4.8"]
26
[1.0"]
100 [3.9"]
2- 13 [ 0.5"]
™ > ™ @2%/21* +2/(
50 [2.0"]
120 [4.7"]
5-
13 [ 0.5"]
36 [1.4"]
70 [2.8"]
140 [5.5"]
85 [3.3"]
626
[24.6"]
™ > ™ @2%/21* +2/(
* $6 ,1/ ( 7
COLD WATER INLET
WATER DRAIN VALVE
(WATER FILTER)
: ,5,1* 7+528* +: $<
+2 7 : $7( 5 2 8 7/ ( 7
WATER DRAIN VALVE
(AC120V)
36 [1.4"]
79
[3.1"]
262 [10.3"]
199
[7.8"]
241[9.5"]
125[4.9"]
184[7.2"]
188[7.4"]
+2 7 : $7( 5 2 87/ ( 7
* $6 ,1/ ( 7
: ,5,1* 7+528* +: $<
&2 / ' : $7( 5 ,1/ ( 7
(AC120V)
(VIEW FROM TOP)
HEIGHT OF EACH FITTINGS
FROM BOTTOM OF CASE
NR981-DVC/NC1991-DVC
HOT WATER OUTLET 1.8"[45mm]
COLD WATER INLET 2.2"[55mm]
GAS INLET
2.2"[56mm]
600[23.6"]
88[3.4"]42[1.7"]
252[9.9"] 61[2.4"]
334[13.1"]
350[13.8"]
AIR INLET
FLUE COLLAR
336[13.2"]
10[0.4"]
10[0.4"]
240[9.4"] 10[0.4"]
28[1.1"]
567[22.3"]
41[1.6"]
AIR INLET
(AC120V)
COLD WATER INLET
WATER DRAIN VALVE
+2 7 : $7( 5 2 8 7/ ( 7
(WATER FILTER)
* $6 ,1/ ( 7
WATER DRAIN VALVE
: ,5,1* 7+528* +: $<
: ,5,1* 7+528* +: $<
4-
13[ 0.5"]
™ > ™ @2%/21* +2/(
50[2.0"]
85[3.3"]
120[4.7"]
60[2.4"]
120[4.7"]
4-
13[ 0.5"]
10[0.4"]
622[24.5"]
10[0.4"]
84 [3.3"]
™ > ™ @2%/21* +2/(
+2 7 : $7( 5 2 8 7/ ( 7
: ,5,1* 7+528* +: $<
36 [1.4"]
262 [10.3"]
171
[6.7"]
97[3.8"]
50[2.0"]
241[9.5"]
60[2.4"]
146[5.7"]
134[5.3"]
155[6.1"]
* $6 ,1/ ( 7
&2 / ' : $7( 5 ,1/ ( 7
: ,5,1* 7+528* +: $<
(AC120V)
+2 7 : $7( 5 2 87/ ( 7
: ,5,1* 7+528* +: $<
(VIEW FROM TOP)
HEIGHT OF EACH FITTINGS
FROM BOTTOM OF CASE
NR981-OD / NC1991-OD
HOT WATER OUTLET 1.8"[45mm]
COLD WATER INLET 2.2"[55mm]
GAS INLET
2.2"[56mm]

NR981-SV
NR83-DVC
<inch(mm)>
(VIEW FROM TOP)
CONDENSATE DRAIN
AIR INLET
FLUE COLLAR
13.2" (336mm)
13.8" (350mm)
13.1" (334mm)
Ø5.0" (Ø127mm)
Ø3.1" (Ø79mm)
HOT WATER OUTLET (3/4")
6.3" (159mm)
8.6" (219mm)
WIRING THROUGHWAY
(AC120V)
GAS INLET (3/4")
COLD WATER INLET (3/4")
1.2" (31mm)
10.9" (277mm)
5.9" (150mm)
3.0" (76mm)
4.3" (110mm)
6.7" (171mm)
23.6" (600mm)
WATER DRAIN VALVE
(WATER FILTER)
COLD WATER INLET
GAS INLET
WATER DRAIN VALVE
HOT WATER OUTLET
WIRING THROUGHEAY
(AC120V)
0.4" - 1.8" (10 - 45mm)
1.1" (28mm)
0.4" - 1.8" (10 - 45mm) 9.4" (240mm)
4.8" (121mm)
6 - 0.2" x 0.4" (6 x10mm) OBLONG HOLE
2 - Ø0.5" (Ø 13mm)
5.5" (140mm)
3.9" (100mm)
2.8" 70mm)
1.4" (36mm)
4.7" (120mm)
3.3" (85mm)
2.0" (50mm)
HEIGHT OF EACH FITTINGS FROM BOTTOM OF CASE
5 - Ø0.5" (Ø 13mm)
2 - 0.3" x 0.5" (6.5 x13mm) OBLONG HOLE
24.6" (626mm) 22.3" (567mm) 1.0" (26mm)
4.4" (113mm) 4.0" (102mm)
HOT WATER OUTLET
COLD WATER INLET
GAS INLET
1.8" (45mm)
1.9" (49mm)
2.2" (56mm)
NR83-DVC
15
100[φ4"]
600[23.6"]
334[13.1"]
350[13.8"]
AIR INLET
FLUE COLLAR
336[13.2"]
10[0.4"]
10[0.4"]
567[22.3"]
70[2.8"]
240[9.4"]
28[1.1"]
95[3.7"]
41[1.6"]
(AC120V)
COLD WATER INLET
WATER DRAIN VALVE
HOT WATER OUTLET
(WATER FILTER)
GAS INLET
WIRING THROUGHWAY WIRING THROUGHWAY
4-
13[ 0.5"]
2-6.5×13[0.3×0.5"]OBLONG HOLE
50[2.0"]
85[3.3"]
120[4.7"]
60[2.4"]
120[4.7"]
4-
13[ 0.5"]
10[0.4"]
622[24.5"]
10[0.4"]
84 [3.3"]
3-6.5×16.5[0.3×0.6"]OBLONG HOLE
WATER DRAIN VALVE
WIRING THROUGHWAY
36 [1.4"]
262 [10.3"]
171
[6.7"]
97[3.8"]
50[2.0"]
241[9.5"]
188[7.4"]
155[6.1"]
60[2.4"]
GAS INLET (3/4")
COLD WATER INLET (3/4")
WIRING THROUGHWAY
(AC120V)
HOT WATER OUTLET (3/4")
WIRING THROUGHWAY
(VIEW FROM TOP)
HEIGHT OF EACH FITTINGS
FROM BOTTOM OF CASE
NR981-SV
HOT WATER OUTLET 1.8"[45mm]
COLD WATER INLET 2.2"[55mm]
GAS INLET
2.2"[56mm]

4. Components
Freeze Prevention
Heater 2
Lightning arrester
Fan Motor
Condensate Trap
Drain cover
Main Flow Control Valve
Power supply cord
Heat Exchanger
Thermistor
Manifold
Water Flow Sensor
Freeze Prevention
Heater 2
Freeze Prevention
Heater 3
Freeze Prevention
Heater Q
High Limit Switch
Burner
Thermal fuse
Igniter
Primary Heat Exchanger
Secondary Heat Exchanger
AIR INLET FLUE COLLAR
Hot Water Outlet Gas InletWater Inlet
Water Drain Valve
Water Drain Valve
NRC98-DV
NRC83-DV
16

Freeze Prevention
Heater 2
Lightning arrester
Fan Motor
Condensate Trap
Drain cover
Main Flow Control Valve
Power supply cord
Heat Exchanger
Thermistor
Manifold
Water Flow Sensor
Freeze Prevention
Heater 2
Freeze Prevention
Heater Q
High Limit Switch
Burner
Thermal fuse
Igniter
Primary Heat Exchanger
Secondary Heat Exchanger
FLUE COLLAR
Hot Water Outlet Gas InletWater Inlet
Water Drain Valve
Water Drain Valve Junction Box
Power supply cord
NRC98-OD
NRC83-OD
17

NRC1111-DV
NCC1991-DV
18

NRC1111-OD
NCC1991-OD
19

Igniter
Thermal Fuse
Flame Rod
Heat Exchanger Thermistor
Fan Motor
Main Flow Control Valve
Bypass Flow Control Valve
Freeze Prevention Heater
Hot Water Outlet
Water Drain Valve Water Inlet
Gas Inlet
Freeze Prevention Heater
Manifold
Circuit Board
Lightning Arrester
High Limit Switch
Freeze Prevention Heater
Flue Collar
Air Inlet
Water Flow Sensor
Burner
Primary Heat Exchanger
Ignition Plug
Freeze Prevention Heater
Water Inlet Thermistor
Air Inlet Thermistor
Water Drain Valve
(Water Filter)
Wiring Thoroughways
Water Outlet Thermistor
Freeze Prevention Heater
Freeze Prevention Heater
NR981-DVC
NC1991-DVC
20