Noritz NR50-OD Service Manual
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Noritz NR50-OD Service Manual

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See also: Owner's Manual , Installation Manual
NR50-OD
NR66 (-SV,-OD) / N-0531S (-OD)
NR71 (-SV,-OD) / N-0631S (-OD)
NR98 (-SV,-OD,-DVC) / NC199 (-OD, -DVC) / N-0751M (-OD,-DVC)
NCC199 (-SV,-DV) / N-0841MC (-DV)
NRC111 (-SV,-DV) / N-0842MC (-DV)
NR111 (-SV,-OD,-DV) / NC250 (-SV,-DV)-ASME / N-0931M (-OD,-DV)
NC380-SV-ASME / N-1321M-ASME
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
NORITZ America Corporation
Gas Water Heater
Contents
1
Rev: July, 2011
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3
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10
19
34
44
49
54
54
57
62
71
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75
79
80
82
83
88
89
90
94
WS-06-9019E

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Summary of Contents for Noritz NR50-OD

  • Page 1 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...

  • Page 2: Important Safety Information

    Caution belt whenever necessary. Use only the appropriate tools and parts: Only use replacement parts manufactured by Noritz for this model as listed in the Warning 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.

  • Page 3: Features

    1. Features "I...
  • Page 4 Overview of Condensing Tankless Gas Water Heater This water heater is a high efficiency, fully condensing appliance. Unlike a traditional tankless water heater, a condensing type captures heat from the exhaust gas and uses it to preheat the incoming cold water as it passes through the secondary heat exchanger as illustrated below.

  • Page 5: Specifications/Performance Tables

    2. Specifications/Performance Table NR50-OD / NR66 (-SV,-OD) / N-0531S (-OD) / NR71 (-SV,-OD) / N-0631S (-OD) Item Specification Model Name NR66-SV NR66-OD NR71-SV NR71-OD NR50-OD N-0531S N-0531S-OD N-0631S N-0631S-OD Type Installation Outdoor, Indoor/Outdoor, Outdoor, Indoor/Outdoor, Outdoor, Wall Mounted Wall Mounted...
  • Page 6 NCC199 (-SV,-DV) / N-0841MC (-DV) / NRC111 (-SV,-DV) / N-0842MC (-DV) Item Specification Model Name NCC199-SV NCC199-DV NRC111-SV NRC111-DV N-0841MC N-0841MC-DV N-0842MC N-0842MC-DV Indoor/Outdoor, Outdoor, Indoor/Outdoor, Type Installation Indoor, Wall Mounted Wall Mounted Wall Mounted Wall Mounted Air Supply/Exhaust Power Vented Ignition Direct Ignition Operating Pressure...
  • Page 7 0.5 - 6.6 Gal./min. 0.5 - 7.1 Gal./min. 0.5 - 5.0 Gal./min. Default Temperature Options 120, 130, 135 (for NR50-OD only), 140°F (Original is 120°F) Temperature Settings (Using the Remote Controller) 100 - 150°F (In 5°F intervals), 160°F (12 Options) Item...
  • Page 8 NR71 (-SV,-OD) / N-0631S (-OD) [Winter] Inlet Water Temp. 46˚F [Spring/Fall] Inlet Water Temp. 64˚F [Summer] Inlet Water Temp. 82˚F Flow Rate (GPM) Flow Rate (GPM) Flow Rate (GPM) NR98 (-SV,-OD,-DVC) / NC199 (-OD,-DVC) / N-0751M (-OD,-DV,-DVC) [Winter] Inlet Water Temp. 46˚F [Spring/Fall] Inlet Water Temp.
  • Page 9 System Controllers are compatible with Commercial models only (NC199, NCC199, NC250, and NC380 Series). The Storage Tank setting is a feature that is only available with SC-201-6M(-EXT), SC-201-12M, and SC-201-24M System Controller models. See System Controller Manual for more information regarding installation and compatibility. NR50-OD Flow Rate (gpm) NR66 (-SV,-OD) / N-0531S (-OD)

  • Page 10: Dimensions

    20.0 10.0 12.0 14.0 10.0 Flow Rate (GPM) 10.0 11.0 12.0 13.0 Flow Rate (GPM) 3. Dimensions NR50-OD (VIEW FROM TOP) 10.0" 7.0" 4.3" 13.3" 1.5" HOT WATER OUTLET (3/4") GAS INLET (1/2") COLD WATER INLET (3/4") 7.2" WIRING THROUGHWAYS 13.8"...
  • Page 11 NR66-SV / N-0531S (VIEW FROM TOP) 10.0" 7.0" 4.3" 1.5" 13.3" HOT WATER OUTLET (3/4") GAS INLET (3/4") COLD WATER INLET (3/4") 7.2" WIRING THROUGHWAYS 13.8" 0.4" 6.7" 13.1" 4.7" 3" 3.0" FLUE COLLAR UPPER WALL MOUNT BRACKETS 4.7" AIR INLET 2.4"...
  • Page 12 NR71-SV / N-0631S 13.3" (VIEW FROM TOP) 4- 0.5" 10.5" 7.8" 2-0.3" x 0.5" 0.4" 6.7" 13.8" 6.2" OBLONG HOLE 3" 1.4" 13.1" 4.7" 4" 1.1" FLUE COLLAR HOT WATER OUTLET (3/4") 2.0" GAS INLET (3/4") COLD WATER INLET (3/4") 3.3"...
  • Page 13 NR98-SV / N-0751M 13.2" (VIEW FROM TOP) 4- 0.5" 10.3" 2-0.3 x 0.5" 7.1" OBLONG HOLE 1.4" 13.8" 4.7" 0.4" 9.4" 13.1" 3.3" 1.1" 3.7" 2.0" 4" FLUE COLLAR HOT WATER OUTLET (3/4") GAS INLET (3/4") WIRING THROUGHWAY COLD WATER INLET (3/4") 3.1"...
  • Page 14 N-0751M-DV 17.7" (VIEW FROM TOP) 4- 0.5" 10.8" 6-0.24 x 0.4"OBLONG HOLE 9.4" 18.3" 3.7" 17.6" 6.7" 5.5" 5.9" 9.1" 9.4" 0.4" 3.9" 4" 4" 3.7" 1.1" 2.8" FLUE COLLAR AIR INLET 1.4" WIRING THROUGHWAY HOT WATER OUTLET (3/4") (120VAC) GAS INLET (3/4") WIRING THROUGHWAY COLD WATER INLET (3/4")
  • Page 15 NCC199-SV / N-0841MC / NRC111-SV / N-0842MC 17.7" (VIEW FROM TOP) 4- 0.5" NRC111-SV/ N-0842MC 13.7" 6-0.24 x 0.4" OBLONG HOLE WIRING THROUGHWAY (AC120VAC) 10.4" 6.7" 18.3" 10.0" 17.6" 5.5" 5.1" 0.4" 9.4" 8.4" 3.9" 18.4" 3.9" 5.1" FLUE COLLAR 2.8"...
  • Page 16 NR111-SV / NC250-SV-ASME / N-0931M 17.7" HEIGHT OF EACH FITTINGS FROM BOTTOM OF CASE 4- 0.5" 6-0.24 x 0.4" OBLONG HOLE NR111-SV/NC250-SV-ASME/ N-0931M 1.7" HOT WATER OUTLET 18.3" 6.7" 2.2" COLD WATER INLET 5.5" 17.6" 0.4" 9.4" 3.9" 4" FLUE COLLAR GAS INLET "...
  • Page 17 NR111-DV / NC250-DV-ASME / N-0931M-DV 17.7" HEIGHT OF EACH FITTINGS FROM BOTTOM OF CASE NR111-DV/NC250-DV-ASME/ N-0931M-DV (-ASME) 4- 0.5" HOT WATER OUTLET 1.7" 6-0.24 x 0.4" OBLONG HOLE 18.3" COLD WATER INLET 2.2" 6.7" 17.6" 5.5" GAS INLET 2.2" 5.9" 9.1"...
  • Page 18 RC-7649M (Optional for NR50-OD / NR66 (-SV,-OD) / N-0531S (-OD) / NR71 (-OD) / N-0631S (-OD)) 5.0" 0.8" RC-7650M (Optional Canadian Version) 5.0" 0.8"...

  • Page 19: Components

    Water Drain Valve G.F.C.I * Freeze protection kit is an optional accessory for the NR50-OD model and is not included with the unit. For cold weather installations, the optional Freeze Protection Kit (#SKG7772) is required in order to prevent internal freezing. For more information about the Freeze Protection Kit, please contact Noritz...
  • Page 20 NR66-SV / N-0531S Exhaust Flue Anti-Frost Heater Heat Exchanger High-Limit Switch Frost Sensing Switch Flame Rod Ignition Electrode Thermal Fuse Manifold Igniter Gas Valve Unit Circuit Board Flow Control Valve Anti-Frost Heater Hot Water Outlet Water Filter Gas Inlet Cold Water Inlet G.F.C.I...
  • Page 21 NR71-OD / N-0631S-OD Exhaust Terminal Heat Exchanger High-Limit Switch Anti-Frost Heater Flame Rod Thermal Fuse Ignition Electrode Burning LED Manifold Igniter Fan Motor Transformer Gas Valve Unit Water Flow Sensor Circuit Board Frost Sensing Switch Flow Control Valve G.F.C.I. Anti-Frost Heater Junction Box Gas Inlet Hot Water Outlet...
  • Page 22 NR71-SV / N-0631S Exhaust Flue Heat Exchanger High-Limit Switch Frost Sensing Switch Flame Rod Anti-Frost Heater Ignition Electrode Thermal Fuse Burning LED Manifold Igniter Fan Motor Gas Valve Unit Transformer Water Flow Sensor Circuit Board Frost Sensing Switch Flow Control Valve G.F.C.I.
  • Page 23 NR98-OD / N-0751M-OD Heat Exchanger Exhaust Flue Thermal Fuse High Limit Switch Heat Exchanger Thermistor Anti-Frost Heater Flame Rod Igniter Ignition Electrode Manifold Circuit Board Fan Motor Transformer Water Flow Sensor Bypass Flow Control Valve Current Leakage Main Flow Control Valve Safety Device(GFCI) Anti-Frost Heater Air Inlet Thermistor...
  • Page 24 NR98-SV / N-0751M Exhaust Flue Heat Exchanger Thermal Fuse High Limit Switch Heat Exchanger Thermistor Anti-Frost Heater Flame Rod Igniter Ignition Electrode Manifold Circuit Board Fan Motor Transformer Water Flow Sensor Bypass Flow Control Valve Main Flow Control Valve Current Leakage Safety Device(GFCI) Anti-Frost Heater Air Inlet Thermistor...
  • Page 25 N-0751M-DV Air Inlet Exhaust Flue Heat Exchanger Thermal Fuse Heat Exchanger High Limit Switch Thermistor Anti-Frost Heater Flame Rod Igniter Manifold Ignition Electrode Circuit Board Fan Motor Transformer Water Flow Sensor Bypass Flow Control Valve Current Leakage Main Flow Control Valve Safety Device(GFCI) Anti-Frost Heater Air Inlet Thermistor...
  • Page 26 NR98-DVC / NC199-DVC / N-0751M-DVC Flue Collar Air Inlet Igniter Heat Exchanger High Limit Switch Heat Exchanger Anti-Frost Heater Thermistor Manifold Thermal Fuse Circuit Board Flame Rod Water Flow Sensor Current Leakage Fan Motor Safety Device(GFCI) Main Flow Control Valve Transformer Bypass Flow Control Valve Anti-Frost Heater...
  • Page 27 NCC199-SV / N-0841MC / NRC111-SV / N-0842MC Exhaust Flue Frost Sensing Switch Secondary Heat Exchanger Anti-Frost Heater Frost Sensing Switch Primary Heat Exchanger Anti-Frost Heater High Limit Switch Thermal Fuse Anti-Frost Heater Main Flow Igniter Control Valve Flame Rod Neutralizer Manifold Ignition Electrode Circuit Board...
  • Page 28 NCC199-DV / N-0841MC-DV / NRC111-DV / N-0842MC-DV Exhaust Flue Air Inlet Secondary Heat Exchanger Frost Sensing Switch Frost Sensing Switch Anti-Frost Heater Anti-Frost Heater Primary Heat Exchanger Thermal Fuse High Limit Switch Main Flow Anti-Frost Heater Control Valve Flame Rod Igniter Neutralizer Manifold...
  • Page 29 NR111-SV / NC250-SV-ASME / N-0931M Exhaust Flue Heat Exchanger Frost Sensing Switch Thermal Fuse High Limit Switch Main Flow Control Valve Anti-Frost Heater Anti-Frost Heater Heat Exchanger Thermistor Igniter Bypass Flow Control Valve Flame Rod Manifold Ignition Electrode Circuit Board Fan Motor Water Outlet Thermistor Transformer...
  • Page 30 NR111-OD / N-0931M-OD Heat Exchanger Exhaust Flue Thermal Fuse High Limit Switch Main Flow Control Valve Anti-Frost Heater Heat Exchanger Thermistor Igniter Flame Rod Bypass Flow Control Valve Manifold Ignition Electrode Circuit Board Fan Motor Water Outlet Thermistor Transformer Current Leakage Safety Device (GFCI) Water Flow Sensor Anti-Frost Heater...
  • Page 31 NR111-DV / NC250-DV-ASME / N-0931M-DV Exhaust Flue Air Inlet Heat Exchanger Frost Sensing Switch Thermal Fuse Main Flow Control Valve High Limit Switch Anti-Frost Heater Heat Exchanger Thermistor Igniter Bypass Flow Control Valve Manifold Flame Rod Circuit Board Ignition Electrode Fan Motor Water Flow Sensor Water Outlet Thermistor...
  • Page 32 NC380-SV-ASME / N-1321M-ASME Exhaust Flue Freeze Protection Heat Exchanger Thermostat Wind Pressure Switch Thermal Fuse High Limit Switch Freeze Protection Heater Ignition Electrode Flame Rod Burner Sensor Manifold Circuit Board Igniter Main Water Control Valve Bypass Water Control Valve Fan Motor Gas Valve Mechanism Short Circuit Prevention Device (GFCI)
  • Page 33 Remote Controller (RC-7649M and RC-7650M) Setting Buttons Display (Type RC-7649M) For setting the hot water temperature, the flow meter alarm, and other settings. Power On/Off Button For turning the heater on and off. Flow Meter Alarm Set Button For setting the flow meter alarm.

  • Page 34: Operating Principle

    Burner Valve 2 Gas Solenoid Valve 1 Proportioning Fan Motor Valve Rotational Air Supply Frequency Sensor Frost Sensing Switch (Optional for NR50-OD) Primary Gas Valve Inlet Thermistor Flow Control Valve Water Flow Sensor Outlet Thermistor Impeller Water Filter Water Drain Valve...
  • Page 35 < How to Use NR50-OD, NR66 (-SV,-OD) / N-0531S (-OD), NR71 (-SV,-OD) / N-0631S (-OD) > 1.Normal Operation 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.
  • Page 36 NR98 (-SV,-OD,-DVC) / NC199 (-OD,-DVC) / N-0751M (-OD,-DV,-DVC) Exhaust NR98-DVC N-0751M(-DV,-DVC) Only High-Limit Switch Heat Exchanger Thermistor Heat Exchanger Thermal Fuse Igniter Ignition Electrode Flame Rod Flame Rod Burner Anti-Frost Heater Primary Gas Valve Fan Motor Gas Proportioning Valve Rotational Frequency Gas Solenoid Valve 3 Sensor...
  • Page 37 < How to Use NR98 (-SV,-OD,-DVC) / NC199 (-OD,-DVC) / N-0751M (-DV, -OD -DVC) > 1. Normal Operation (Hot Water Production) 1. Turn on the POWER by pressing the "POWER" button on the remote controller. (The priority lamp lights.) 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 for initiating combustion, the fan will initiate and pre-purge any residual combustibles in the combustion chamber.
  • Page 38 NCC199 (-SV,-DV) / N-0841MC (-DV), NRC111 (-SV,-DV) / N-0842MC (-DV) Exhaust High-Limit Switch Frost Sensing Switch Frost Sensing Switch Anti-Frost Heater Secondary Heat Exchanger Water Level Electrode High-Limit Switch Primary Heat Exchanger Thermal Fuse Main Flow Control Valve Igniter Ignition Electrode Flame Rod Neutralizer Burner...
  • Page 39 < How to Use NCC199 (-SV,-DV) / N-0841MC (-DV), NRC111 (-SV,-DV) / N-0842MC (-DV) > 1. Normal Operation (Hot Water Production) 1. Turn on the POWER by pressing the "POWER" button on the remote controller. (The priority lamp lights.) The main flow control valve will open. 2.
  • Page 40 NR111 (-SV,-OD,-DV) / NC250 (-SV,-DV)-ASME / N-0931M (-OD,-DV) Exhaust NR111 (-SV, -DV)/NC250 (-SV, -DV) N-0931M (-DV) Only High-Limit Switch Frost Sensing Switch Heat Exchanger Thermal Fuse Main Flow Control Valve Heat Exchanger Themistor Igniter Bypass Flow Control Valve Ignition Electrode Flame Rod Flame Rod Burner...
  • Page 41 < How to Use NR111 (-SV,-OD,-DV) / NC250 (-SV,-DV)-ASME / N-0931M (-OD,-DV) > 1. Normal Operation (Hot Water Production) 1. Turn on the POWER by pressing the "POWER" button on the remote controller. (The priority lamp lights.) The main flow control valve will open. 2.
  • Page 42 NC380-SV-ASME / N-1321M-ASME Freeze Protection Thermostat Heat Exchanger Overheat Prevention High Limit Device (Thermal Fuse) Switch Burner Sensor Burner Igniter Flame Rod Gas Solenoid Gas Solenoid Valve 5 Valve 4 Gas Solenoid Valve 3 Gas Solenoid Gas Proportioning Valve 2 Valve Gas Solenoid Valve 1...
  • Page 43 < How to Use NC380-SV-ASME / N-1321M-ASME > 1. Normal Operation (Hot Water Production) 1. Turn on the POWER by pressing the "POWER" button on the remote controller. (The priority lamp lights.) The main flow control valve will open. 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 for initiating combustion, the fan will initiate and pre-purge any residual combustibles in the combustion chamber.

  • Page 44: Operation Flow Chart

    6. Operation Flow Chart NR50-OD / NR66 (-SV,-OD) / N-0531S (-OD), NR71 (-SV,-OD) / N-0631S (-OD) Water Heating Connect power Fix problem *Water control valve opens fully Disconnect Power Current leakage safety device normal Warning indication Priority lamp turns OFF The unit will continue to operature with the code blinking.
  • Page 45 Shutdown procedure NR98 (-SV,-OD,-DVC) / NC199 (-OD,-DVC) / N-0751M (-OD,-DV,-DVC) On/Off button turn ON Water flow sensor detects Water Heating < 0.4 GPM Burner On lamp goes off Connect power Fix problem Gas proportioning valve closes Primary gas solenoid Bypass flow control valve valve closes and main flow control valve Disconnect power...
  • Page 46 Shutdown procedure NCC199 (-SV, -DV) / N-0841MC (-DV), NRC111 (-SV, -DV) / N-0842MC (-DV) ON/OFF button turn ON Water Heating Water flow sensor detects < 0.4 GPM Connect power Fix problem BURNER ON lamp goes off Bypass flow control valve Gas proportioning valve and main flow control valve Disconnect power...
  • Page 47 NR111 (-SV,-OD,-DV) / NC250 (-SV,-DV)-ASME / N-0931M (-OD,-DV) Shutdown Procedure Hot Water Demand Ceases Water heating Water flow sensor detects < 0.4 GPM Connect power Fix problem Burner On lamp goes off Gas proportioning valve Bypass flow control valve closes and main flow control valve Disconnect power Primary gas solenoid...
  • Page 48 NC380-SV-ASME / N-1321M-ASME...

  • Page 49: Wiring Diagram

    7. Wiring Diagram NR50-OD NR66 (-SV,-OD) / N-0531S (-OD), NR71 (-SV,-OD) / N-0631S (-OD) FAN SPEED CORRECTOR 160 °F (75 °C) FLOW CONTROL W(VCC) VALVE R(VCC) 140 °F (60 °C) BURNING LED Y(Fully open) BL(GND) <N-0631S(-OD) Model Only> WATER OUTLET REMOTE CONTROLLER 130 °F (55 °C)
  • Page 50 NR98 (-SV,-OD,-DVC) / NC199 (-OD,-DVC) / N-0751M (-OD,-DV,-DVC)
  • Page 51 NCC199 (-SV,-DV) / N-0841MC (-DV) / NRC111 (-SV,-DV) / N-0842MC (-DV) WIRING DIAGRAM (Pulse) HEAT EXCHANGER (Vcc) (GND) FLOW SENSOR 130 °F (55 °C) TEMPERATURE FROST SENSING SWITCH ADJUSTMENT 140 °F (60 °C) SWITCH 180 °F (83 °C) <CN89> FAN SPEED CORRECTOR AIR INLET <CN102>...
  • Page 52 NR111 (-SV,-OD,-DV) / NC250 (-SV,-DV) / N-0931M (-OD,-DV) WIRING DIAGRAM (Pulse) HEAT EXCHANGER (Vcc) (GND) FLOW SENSOR <N-0931M, N-0931M-DV Model Only> 130 F (55 C) TEMPERATURE FROST SENSING SWITCH ADJUSTMENT 140 F (60 C) SWITCH 180 F (83 C) <CN89> WWWBK FAN SPEED CORRECTOR <CN102>...
  • Page 53 NC380-SV-ASME / N-1321M-ASME WIRING DIAGRAM...

  • Page 54: Troubleshooting

    When adjusting the manifold gas pressure, be sure to remove the exhaust flue, the air inlet and the flue collar. <NR50-OD / NR66 (-SV,-OD) / N-0531S (-OD), NR71 (-SV,-OD) / N-0631S (-OD)> Error Codes and Checkpoints (With optional remote controller connected)
  • Page 55 <NCC199 (-SV,-DV) / N-0841MC (-DV), NRC111 (-SV,-DV) / N-0842MC (-DV)> Error Codes and Checkpoints (In the case of optional remote controller connection) Display Description Diagnosis Point (Trouble Point) Remarks (F) 10 Combustion abnormality Check for abnormal combustion. To reset this error code, the power needs to (BTU Drop) Check flue for blockage or obstruction.
  • Page 56 <NR98 (-SV,-OD,-DVC) / NC199 (-OD,-DVC) / N-0751M (-OD,-DV,-DVC) NR111 (-SV,-OD,-DV) / NC250 (-SV,-DV)-ASME / N-0931M (-OD,-DV) / NC380-SV-ASME / N-1321M-ASME > Error Codes and Checkpoints (In the case of optional remote controller connection) Display Description Diagnosis Point (Trouble Point) Remarks (F) 10 Combustion abnormality Check for abnormal combustion.

  • Page 57: Circuit Board Checkpoints

    <NR50-OD / NR66 (-SV,-OD) / N-0531S (-OD), NR71 (-SV,-OD) / N-0631S (-OD)> Circuit Board Checkpoints Circuit Board Checkpoints Part Normal Value Remarks 1 Remarks 2 Harness CN & Pin No. CN & Pin No. Color Thermal Fuse BL-R CN59 2Ω or less...
  • Page 58 <NR98 (-SV,-OD,-DVC) / NC199 (-OD,-DVC) / N-0751M (-OD,-DV,-DVC)> Circuit Board Checkpoints Circuit board Checkpoints Ref. Part Normal value Remarks CN & Pin No. Wire color CN & Pin No. Overheat Prevention 2 Ω or less CN38 BL - BL CN38 Device (Thermal Fuse) BL - O DC 1 - 16 V...
  • Page 59 <NCC199 (-SV,-DV) / N-0841MC (-DV), NRC111 (-SV,-DV) / N-0842MC (-DV)> Circuit Board Checkpoints Circuit board Check points Ref. Part Normal value Remarks CN & Pin No. Wire color CN & Pin No. Overheat Prevention 2 Ω or less CN38 BL - BL CN38 Device (Thermal Fuse) BL - O...
  • Page 60 <NR111 (-SV -OD,-DV) / NC250 (-SV,-DV)-ASME / N-0931M (-OD)> Circuit Board Checkpoints Circuit board Checkpoints Ref. Part Normal value Remarks CN & Pin No. Wire color CN & Pin No. Overheat Prevention 2 Ω or less CN38 BL - BL CN38 Device (Thermal Fuse) BL - O...
  • Page 61 <NC380-SV-ASME / N-1321M-ASME> Circuit Board Checkpoints...

  • Page 62: Error Descriptions And How To Reset

    <NR50-OD / NR66 (-SV,-OD) / N-0531S (-OD), NR71 (-SV,-OD) / N-0631S (-OD)> Error Descriptions and How to Reset...
  • Page 65 <NCC199 (-SV,-DV) / N-0841MC (-DV) / NRC111 (-SV,-DV) / N-0842MC (-DV) Error Descriptions and How to Reset...
  • Page 68 <NR98 (-SV,-OD,-DVC) / NC199 (-OD,-DVC) / N-0751M (-DV, -OD, -DVC), NR111 (-SV,-OD,-DV) / NC250 (-SV,-DV)-ASME / N-0931M (-DV, -OD), NC380-SV-ASME / N-1321M-ASME> Error Descriptions and How to Reset...

  • Page 71: Displaying Maintenance Monitor

    Remote Controller (Optional for NR50-OD / NR66 (-SV,-OD) / N-0531S (-OD), NR71 (-SV,-OD) / N-0631S (-OD)) RC-7649M Setting Button Operation Button (Switching Indication)(Changing Data No.) Display (Data No.) Displaying Maintenance Monitors <Display Procedure> 1. Press and hold both the up [ ] and down [ ] setting buttons simultaneously for more than two seconds.
  • Page 72 <NR50-OD / NR66 (-SV,-OD) / N-0531S (-OD), NR71 (-SV,-OD) / N-0631S (-OD)> Maintenance Monitor List (Using Optional Remote Controller) Data Minimum Data (Display Reading x Multiplier) Value for Item Remarks Multiplier Unit Indication Total Plug-inTime X 100 hour 100 hours Disp.

  • Page 73: Maintenance Monitor List

    <NCC199 (-SV,-DV) / N-0841MC (-DV), NRC111 (-SV,-DV) / N-0842MC (-DV)> Maintenance Monitor List Data Minimum Data (Display Reading Multiplier) Value for Item Remarks Multiplier Unit Indication Total Plug-in Time Disp. Range [000] - [1310] hour 100 hours Disp. Range [000] - [999] hour 1 hours Total Combustion Time...
  • Page 74 <NR98 (-SV,-OD,-DVC) / NC199 (-OD,-DVC) / N-0751M (-DV,-OD,-DVC), NR111 (-SV,-OD,-DV) / NC250 (-SV,-DV)-ASME / N-0931M (-DV,-OD), NC380-SV-ASME / N-1231M-ASME> Maintenance Monitor List Data Minimum Data (Display Reading Multiplier) Value for Item Remarks Multiplier Indication Unit Total Plug-in Time Disp. Range [000] - [1310] hour 100 hours Disp.

  • Page 75: Circuit Board Replacement

    RC-7649M Setting Button 5. Change "1F" from OFF to ON. (for NR50-OD, NR71 (-SV,-OD) and N-0631S (-OD) models only) 6. Change "2B" from OFF to ON. (Swiching ON/OFF) 7. Change "FE" and "FC" from OFF to ON in order to access the hidden maintenance writers.
  • Page 76 <NCC199 (-SV,-DV) / N-0841MC (-DV) / NRC111 (-SV,-DV) / N-0842MC (-DV)> Circuit Board Replacement * Be sure to read. It is necessary to transfer data when replacing a circuit board. Vital information about the water heater such as the settings and unit history will have to be written to the new board.
  • Page 77 <NR98 (-SV,-OD,-DVC) / NC199 (-OD,-DVC) / N-0751M (-OD,-DV,-DVC), NR111 (-SV,-OD,-DV) / NC250 (-SV,-DV)-ASME / N-0931M (-OD,-DV)> Circuit Board Replacement (When Circuit Board Type is ELV-A or ELW and later) * Be sure to read. It is necessary to transfer data when replacing a circuit board. Vital Reference connection diagram (for simplification, other connections have been omited) information about the water heater such as the settings and unit history...
  • Page 78 <NC380-SV-ASME / N-1321M-ASME> Circuit Board Replacement * Be sure to read. It is necessary to transfer data when replacing a circuit board. Vital Reference connection diagram (for simplification, other connections have been omited) information about the water heater such as the settings and unit history will have to be written to the new board.

  • Page 79: Changing The Fan Motor

    Changing the Fan Motor When Bell-mouth(B) is installed in the old fan motor, install Bell-mouth (B) as shown in figure to maintain the proper air volume. When you change the fan motor, please remove this part from the old fan motor, and install in the new fan motor. After changing the fan motor, please follow the procedure "Circuit Board Settings 1"...
  • Page 80 Neutralizer Life Cycle Warning and Replacement Procedures (NCC199/NRC111 and N-0841MC/N-0842MC series only) Neutralizer Life Cycle Counter Operation: Neutralizer Usage Estimate When 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.
  • Page 81 Failure to fill the neutralizer unit could result in severe personal injury or death. Refer to the installation manual or contact Noritz America Technical Support (866-766-7489) for instructions. Disposal method of neutralizing agent (calcium carbonate) remaining in the neutralizer after replacement The neutralizing agent is high purity calcium carbonate (limestone) and it does not contain chemical substances that are harmful to the environment.

  • Page 82: Gas Line Requirements

    Gas Line Requirements All Noritz Tankless Water Heaters must be provided with a sufficient supply of gas in order to function properly. An undersized gas line could result in under heated water temperatures and an error code displayed on the operation panel. To verify a properly sized gas line, follow the below procedures. The gas line must provide at least the minimum stated pressure at the maximum firing rate.

  • Page 83: Manifold Gas Pressure Adjustment

    <NR50-OD / NR66 (-SV,-OD) / N-0531S (-OD), NR71 (-SV,-OD) / N-0631S (-OD)> Manifold Gas Pressure Adjustment Note 1) Use the following procedure to adjust the manifold gas pressure only if it can be done with a high flow rate through the unit.
  • Page 84 <NR98 (-SV,-OD,-DVC / NC199 (-OD,-DVC) / N-0751M (-OD,-DV,-DVC)> Manifold Gas Pressure Adjustment Note 1) Use the following procedure to adjust the manifold gas pressure only if it can be done with a high flow rate through the unit. Note 2) When the manifold gas pressure is adjusted, the front cover will be off.
  • Page 85 Manifold Gas Pressure Maximum and Minimum Values (When Circuit Board Type is ELV-C) Manifold Pressure (inch H Manifold Pressure (inch H Supply Cover On Cover Off Model Name Gas Type Pressure (inch H Max. Value Min. Value Max. Value Min. Value 2.80 0.65 2.99...
  • Page 86 <NCC199 (-SV,-DV) / N-0841MC (-DV) / NRC111 (-SV,-DV) / N-0842MC (-DV), NR111 (-SV,-OD,-DV) / NC250 (-SV,-DV)-ASME / N-0931M (-OD,-DV)> Manifold Gas Pressure Adjustment Note 1) Use the following procedure to adjust the manifold gas pressure only if it can be done with a high flow rate through the unit.
  • Page 87 <NC380-SV-ASME / N-1321M-ASME> Manifold Gas Pressure Adjustment Note 1) Use the following procedure to adjust the manifold gas pressure only if it can be done with a high flow rate through the unit. Note 2) When the manifold gas pressure is adjusted, the front cover will be off. Adjust the manifold gas pressure to the value of "Cover Off"...

  • Page 88: Periodic Inspection

    Periodic Inspection CAUTION To prevent burns or scalding, turn off the power button (or power supply*) and wait until the equipment cools before performing maintenance. Be sure to do. * = NR71 (-SV,-OD) and N-0631S (-OD) only Check For laundry, newspaper, timber, For dust and soot in Check oil, spray cans and other...

  • Page 89: Periodic Maintenance

    Periodic Maintenance Water Drain Valve (with Water Filter) If the water drain valve (with water filter) is covered with debris, the hot water may not run smoothly, or the unit may put out cold water. Check and clean the filter as explained below. * To avoid burns, wait until the equipment cools down before draining the water.

  • Page 90: Changing Default Temperature Setting

    To access higher temperature settings through the remote controller, follow the below steps. The NR50-OD can be programmed so that it will default to one of four temperatures (140, 135, 130, 120°F) while the NR66/N-0531S and NR71/N-0631S can be set to one of three temperatures (140, 130, 120°F) when the optional remote controller is not connected.
  • Page 91 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 using NR50-OD the UP and DOWN setting buttons. 10. To put the water heater back into operation, press the ON/OFF button on the remote controller.
  • Page 92 <When setting the maximum temperature to 125-180°F> 1. Turn the water heater off by pressing the ON/OFF button on the remote controller. 2. Disconnect electrical power to the water heater. 3. Remove the front cover of the water heater (4 screws). 4.
  • Page 93 Draining the Water for Maintenance or for Freeze Prevention : CAUTION To avoid burns, wait until the equipment cools down before draining the water. The appliance will remain hot after it is turned off. High Temperature Drain water into a bucket to prevent water damage. Drainage Using the Remote Controller (NCC/NRC/841/842 series only) Manual Draining Close the gas valve.

  • Page 94: Installation Check

    9. Installation Check Installation problems can cause the unit to work unsatisfactorily. If the unit is not working properly, but there are no 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 become abnormal because of the thinness of the air.
  • Page 95 Filling the Neutralizer Unit before Vent Pipe Installation. Prior to initial start up, make sure that you fill the neutralizer unit with water. DANGER This is to prevent dangerous exhaust gases from entering the building. Failure to fill the neutralizer unit could result in severe personal injury or death. Please follow one of the procedures described below to ensure that the neutralizer unit is filled with water.

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