Navien NFC-175, Service Manual

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NFC Service Manual 3 Version 1.0
Contents
1. Safety Information 9
1.1 Safety Definitions 9
1.2 Safety Symbols 9
1.3 Symbols Used in the Instructions 9
1.4 Safety Precautions 9
2. Product Information 13
2.1 Product Information Items 13
2.2 Components 14
3. Technical Data 16
3.1 Specifications 16
3.2 Dimensions 19
4. System Details 20
4.1 DIP Switch 1 (6 switch unit) 20
4.2 Dip Switch 2 (8 switch unit) 20
4.3 Measuring the Inlet Gas Pressure 21
4.3.1 Gas Pipe Sizing Tables 23
4.4 Gas & High Altitude Conversion 25
4.5 The Front Panel 32
4.5.1 Icons and Digital Display 32
4.5.2 Buttons and Command dial 33
4.6 Turning the Boiler On or Off 34
4.7 Adjusting the Temperature 34
4.7.1 Adjusting the Space Heating Temperature 34
4.7.2 Adjusting the DHW Temperature 35
4.7.3 Resetting the Boiler 35
4.8 Accessing Basic Menu Items 36
4.8.1 Quick Setup Menu 36
4.8.2 Viewing Basic Information 36
4.8.3 Setting the Space Heating Operation 37
4.8.4 Setting the DHW Operation 38
4.8.5 Viewing Error History 41
4.8.6 Viewing Other System Information 41
4.8.7 Setting the Display Options 42
4.9 Accessing Advanced Menu Items 42
4.9.1 Viewing Service Information 42
4.9.2 Viewing Input and Output Status 43
4.9.3 Setting the Operation Parameters 43
4.9.4 Configuring a Cascade System 46
4.9.5 Setting the External Connection (for NaviLink) 47
4.9.6 Diagnosing the Boiler System
47
4.9.7 Setting the Special Operation Modes 48
4.10 Ladder Diagram 49
4.11 Wiring Diagram 50
4.12 Key Components Description 52
4.12.1 PCB 52
4.12.2 High Limit Switch 53
4.12.3 Thermistor 54
4.12.4 Fan Motor 55
4.12.5 Flame Rod Assembly 56
4.12.6 Ignition Transformer 57
4.12.7 APS 58
4.12.8 Main Gas Valve 59
4.12.9 Burner 60
4.12.10 Heat Exchanger Assembly 61
4.12.11 Water Pressure Sensor 62
4.12.12 Dual Venturi 63
4.12.13 DHW Heat Exchanger 64
4.12.14 3-Way Valve 65
5. Troubleshooting 66
5.1 Error code classification 66
5.2 Error code classification 68
5.2.1 001Error 72
5.2.2 003Error 74
5.2.3 004Error 80
5.2.4 012Error 81
5.2.5 016Error 84
5.2.6 030Error 86
5.2.7 046Error 88
5.2.8 047Error 88
5.2.9 060Error 89
5.2.10 109Error 91