Table Of Contents - Noritz NR501-OD Service Manual

Table of Contents

Table Of Contents1
Important Safety Information2
Safety Tips For Service2
Post-Service Checks2
Specifications/Performance Table3
Performance5
Hot Water Supply Capability6
Pressure Loss Characteristics7
Dimensions9
Components12
Display Window15
When The Gas Burner Is On15
When Hot Water Flows15
Operating Principle16
How To Use18
Normal Operation18
Error Codes18
Miscellaneous18
Operation Flow Chart19
Water Heating20
Shutdown Procedure20
Freeze Prevention Control21
Freeze Prevention Heater21
Wiring Diagram25
Troubleshooting28
Error Codes And Checkpoints28
Circuit Board Checkpoints29
Error Code Displayed31
Specification Of Dummy Flame31
Error Code Diagnostic Flow Charts31
The Fan Does Not Operate When the Hot Water Fixture Is Opened33
Check Whether The Thermistor - Cold Water Is Normal34
Outlet Water Temperature Incorrect35
Ignition Failure37
Flame Rod Does Not Detect Flame40
Overheat Prevention Device (Thermal Fuse) Triggered40
Abnormally High Output Temperature41
High Limit Switch Triggered41
Condensate Container Clogging42
Thermistor - Air Abnormality42
Thermistor - Cold Water Abnormality43
Thermistor - Hot Water Abnormality43
Thermistor - Heat Exchanger Abnormality44
Thermistor - Exhaust Abnormality44
Failure Of Gas Solenoid Valve45
Fan Motor Abnormality46
Circuit Board Abnormality47
Gas Solenoid Valve Drive Circuit Abnormality47
Flame Rod Circuit Abnormality47
Remote Controller Transmission Abnormality48
Display Window Transmission Abnormality48
Air Flow Abnormality49
Combustion Abnormality49
Unit Shuts Off50
Troubleshooting For Abnormalities Due To Scale Build-Up55
Water Leak From The Unit55
Hot Water Is Not Delivered56
Maintenance Monitor List For Scale Build-Up Trouble56
Procedure For Flushing The Heat Exchanger57
The Preparation Of The Flushing System57
Flushing The Heat Exchanger58
Cleaning The Heat Exchanger58
Displaying Maintenance Monitors59
Remote Controller59
Maintenance Monitor List60
Circuit Board Replacement Procedure61
Data Transfer Procedure61
Dip Switch Settings61
Manual Programming62
When Changing The Fan Motor63
Circuit Board Settings63
Circuit Board63
Gas Type64
Gas Conversions64
Meter64
Gas Line Requirements64
Reference Tools & Sample Calculations65
For Less than 8" WC Initial Supply Pressure65
Instructions65
Sample Calculation65
For 8" WC – 10.5" WC Initial Supply Pressure66
Sample Gas Line66
Maximum Undiluted Propane (Lp) Delivery Capacity66
Manifold Gas Pressure Adjustment67
Manifold Gas Pressures Maximum And Minimum Values67
Periodic Inspection68
Periodic Maintenance68
Water Drain Valve (With Water Filter)72
Water Treatment73
Water Treatment System73
Residential Use Treatment Guidelines73
Regular Maintenance74
Water Quality And Maintenance74
Adjusting Set Temperature75
When Setting The Maximum Temperature75
Changing Default Temperature Setting75
Preventing Damage From Freezing76
If Water will Not Flow Because It Is Frozen76
Preventing Freeze Damage76
Turning The Unit Back On78