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Noritz NR50-OD User Manual

Noritz NR50-OD
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NORITZ America Corporation
Gas Water Heater
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
s Refer to this manual whenever performing service or maintenance
on this appliance.
s This manual will be used for service technician training seminars.
s The specifications and descriptions in this manual may be changed
without prior notice.
s For further assistance, contact Noritz Technical Support at 1-866-
766-7489.
Do not short circuit any safety device on
this appliance
Rev: July, 2011
Contents
WS-06-9019E
Important Safety Information 2
1. Features 3
2. Specications/Performance Tables 5
3. Dimensions 10
4. Components 19
5. Operating Principle 34
6. Operation Flow Chart 44
7. Wiring Diagram 49
8. Troubleshooting 54
Error Codes and Checkpoints 54
Circuit Board Checkpoints 57
Error Descriptions and How to Reset 62
Remote Controller (Optional for NR50-OD/NR66/N-0531S Series, NR71/N-0631S Series) 71
Displaying Maintenan
ce Monitor 72
Maintenance Monitor List 73
Circuit Board Replacement 75
Changing the Fan Motor 79
Neutralizer Life Cycle Warning and Replacement Procedures (condensing models only)
80
Gas Line Requirements 82
Manifold Gas Pressure Adjustment 83
Periodic Inspection 88
Periodic Maintenance 89
Changing Default Temperature Setting 90
9. Installation Check 94

Table of Contents

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Noritz NR50-OD Specifications

General IconGeneral
TypeTankless
Fuel TypeNatural Gas
Flow Rate0.5 - 5.0 GPM
GPM at 35°F Rise5.0 GPM
Energy Factor0.82
Energy Factor Range0.81 - 0.83
Voltage120V
Gas TypeNatural Gas
Maximum BTU Input120, 000 BTU/hr
Minimum BTU Input15, 000 BTU/h
VentingOutdoor

Summary

Important Safety Information

Safety Tips for Service

Tips for safe operation and maintenance, including protective gear and tool usage.

Component Identification

NR50-OD, NR66-OD, N-0531S-OD Components

Diagram identifying key components like heat exchanger, igniter, circuit board for NR50-OD, NR66-OD, N-0531S-OD.

NR66-SV, N-0531S Components

Diagram identifying key components like heat exchanger, igniter, circuit board for NR66-SV, N-0531S.

NR71-OD, N-0631S-OD Components

Diagram identifying key components like heat exchanger, igniter, circuit board for NR71-OD, N-0631S-OD.

NR71-SV, N-0631S Components

Diagram identifying key components like heat exchanger, igniter, circuit board for NR71-SV, N-0631S.

NR98-OD, N-0751M-OD Components

Diagram identifying key components like heat exchanger, igniter, circuit board for NR98-OD, N-0751M-OD.

Operating Principle Schematics

Operation Flow Charts

NR50, NR66, NR71 Series Flow Chart

Visualizes water heating logic: normal operation, errors, and component checks for NR50, NR66, NR71 series.

NR98, NC199, N-0751M Series Operation Flow Chart

NCC199, N-0841MC, NRC111, N-0842MC Series Operation Flow Chart

NR111, NC250, N-0931M Series Operation Flow Chart

NC380-SV-ASME / N-1321M-ASME Operation Flow Chart

Wiring Diagrams

NR50-OD Wiring Diagram

Detailed electrical wiring diagram for NR50-OD, showing component connections to the circuit board.

NR66, NR71 Series Wiring Diagrams

Wiring diagrams for NR66 and NR71 series, illustrating component connections to the circuit board.

NR98, NC199, N-0751M Series Wiring Diagram

NCC199, N-0841MC, NRC111, N-0842MC Series Wiring Diagram

NR111, NC250, N-0931M Series Wiring Diagram

NC380-SV-ASME / N-1321M-ASME Wiring Diagram

Troubleshooting Guide

Error Codes and Checkpoints (Remote Controller)

Lists error codes, descriptions, diagnostics, and reset steps when a remote controller is connected.

Error Codes for NR71/N-0631S Series (No Controller)

Lists error codes, descriptions, and troubleshooting for NR71/N-0631S series without a remote controller.

Troubleshooting Error Codes for NCC199, NRC111 Series

Error Codes and Checkpoints (With Remote Controller)

Details error codes, descriptions, diagnostics, and reset procedures for NCC199, NRC111 series with remote controller.

Troubleshooting Error Codes for NR98, NR111, NC380 Series

Circuit Board Checkpoints

NR50-OD, NR66, NR71 Series Checkpoints

Provides normal voltage and resistance values for circuit board components for NR50-OD, NR66, NR71 series.

Circuit Board Checkpoints for NR98, NC199, N-0751M Series

Circuit Board Checkpoints for NCC199, NRC111 Series

Circuit Board Checkpoints for NR111, NC250, N-0931M Series

Circuit Board Checkpoints for NC380-SV-ASME / N-1321M-ASME

Circuit Board Checkpoints

Provides normal values for circuit board components for NC380-SV-ASME / N-1321M-ASME, including thermistor and burner sensor characteristics.

Error Code Descriptions and Reset Procedures

NR50-OD, NR66, NR71 Series Error Details

Explains error codes, causes, checkpoints, and reset procedures for NR50-OD, NR66, NR71 series.

Error Code Details for NCC199, NRC111 Series

Error Code Details for NR98, NR111, NC380 Series

Error Codes and Checkpoints (Optional Remote Controller)

Lists error codes, descriptions, diagnostics, and troubleshooting for NR98, NR111, NC380 series with optional remote controller.

Error Code Details for NR111, NC380 Series

Error Descriptions and Reset Procedures

Explains error codes, causes, checkpoints, and reset procedures for NR111 and NC380 series, covering fan, sensor, and pressure issues.

Displaying Maintenance Monitors

Maintenance Monitor List for NR50, NR66, NR71 Series

Maintenance Monitor List for NCC199, NRC111 Series

Maintenance Monitor List for NR98, NR111, NC380 Series

Circuit Board Replacement Procedures

Circuit Board Replacement for NCC199, NRC111 Series

Data Transfer Procedures

Guide for transferring data when replacing a circuit board in NCC199, NRC111 series, ensuring unit functionality.

Circuit Board Replacement for NR98, NR111 Series

Circuit Board Replacement Procedure

Detailed steps for replacing the circuit board, including data transfer and initial settings for NR98/NR111 series.

Circuit Board Replacement for NC380-SV-ASME / N-1321M-ASME

Data Transfer Procedure

Steps for transferring data when replacing a circuit board in NC380-SV-ASME / N-1321M-ASME models.

Initial Circuit Board Settings

Instructions for setting up a new circuit board, including remote controller connection and DIP settings.

Fan Motor Replacement and Settings

Neutralizer Life Cycle Warnings and Replacement

Resetting the Neutralizer Life Counter

Gas Line Requirements and Sizing

Gas Pressure and Supply Sizing

Guidelines for sizing gas lines based on btuh demand and supply pressures to ensure adequate gas delivery.

Manifold Gas Pressure Adjustment Procedures

NR50, NR66, NR71 Series Pressure Adjustment

Procedure for adjusting manifold gas pressure for NR50, NR66, and NR71 series, including using set buttons and checking values.

Manifold Gas Pressure Adjustment for NR98, NC199, N-0751M Series

NR98, NC199, N-0751M Series Pressure Adjustment

Steps for adjusting manifold gas pressure for NR98, NC199, N-0751M series, using set buttons and referring to cover-on/off values.

Manifold Gas Pressure Adjustment for NCC199, NRC111, NR111, NC250, N-0931M Series

NCC199, NRC111, NR111, NC250, N-0931M Series Pressure Adjustment

Procedure for adjusting manifold gas pressure for NCC199, NRC111, NR111, NC250, N-0931M series, referencing cover-on/off values.

Manifold Gas Pressure Adjustment for NC380-SV-ASME / N-1321M-ASME

NC380-SV-ASME / N-1321M-ASME Pressure Adjustment

Steps for adjusting manifold gas pressure for NC380-SV-ASME / N-1321M-ASME, using set buttons and referencing cover-on/off values.

Periodic Inspection and Maintenance

Periodic Inspection Checklist

Items to check during inspection: combustibles, sounds, appearance, leaks, and vent conditions.

Periodic Maintenance Guidelines

Guidelines for cleaning the unit's exterior and remote controller using appropriate methods.

Periodic Maintenance Procedures

Changing Default Temperature Settings

Draining Water for Maintenance or Freeze Prevention

Drainage Using Remote Controller

Procedure for draining water using remote controller for maintenance/freeze prevention on specific models (NCC/NRC/841/842).

Manual Draining Procedure

Step-by-step guide for manually draining water for maintenance or freeze prevention, including valve and fixture operations.

Installation Checks and Guidelines

Neutralizer Unit Filling Before Vent Pipe Installation

Neutralizer Unit Filling Procedure

Instructions on filling the neutralizer unit with water before initial startup to prevent dangerous exhaust gas release.

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