Navien NFC-175, Installation & Operation Manual

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3 Contents
Contents
Safety Information 4
1. About the Boiler 7
1.1 Included Items 7
1.2 Accessories 7
1.3 Specifications 8
1.4 Components 11
1.5 Dimensions 13
1.6 Rating Plate 14
2. Installing the Boiler 15
2.1 Removing the Wood Pallet from the boiler 15
2.2 Choosing an Installation Location 16
2.3 Mounting the Boiler to the Wall 18
3. Installing the System Piping 19
3.1 Installing a Space Heating System 19
3.2 Installing a Domestic Hot Water (DHW) System 23
3.3 Connecting the Condensate Drain 25
3.4 Filling the System 28
3.5 Testing the Water System 29
3.6 Considerations for System Applications 30
3.7 Examples of Electrical Connections 38
4. Connecting the Gas Supply 47
4.1 Gas Pipe Sizing Tables 49
4.2 Measuring the Inlet Gas Pressure 50
5. Venting the Boiler 52
5.1 Selecting a Vent Type 53
5.2 Selecting Vent Pipe Materials 56
5.3 Measuring Vent Length 57
5.4 Terminating the Vent 57
6. Setting the DIP Switches 60
6.1 DIP Switch 1 (6 switch unit) 60
6.2 Dip Switch 2 (8 switch unit) 60
7. Connecting the Power Supply 62
8. Installing a Cascade System 63
8.1 Connecting Water Supplies 63
8.2 Cascade System - Recirculation System Application
Example 65
8.3 Connecting the Communication Cables 67
9. Installing a Common Vent System 69
9.1 About the Common Vent System 69
9.2 Navien Backflow Damper (Back-draft Damper) 74
9.3 Starting the Common Vent System 75
9.4 Connecting and Terminating the Vent Pipe 77
9.5 Setting Up the Common Vent System 78
9.6 Common Vent Termination Clearances 78
9.7 Installing a Condensate Drain 80
9.8 Exhaust Vent Termination Clearances (For Direct Vent) 81
9.9 Maintenance 82
10. Installation Checklist 83
11. Operating the Boiler 86
11.1 Turning the Boiler On or Off 86
11.2 Adjusting the Temperature 86
11.3 Accessing Basic Menu Items 88
11.4 Accessing Advanced Menu Items 94
11.5 Understanding Error Codes 101
12. Appendixes 103
12.1 Gas & High Altitude Conversion 103
12.2 Wiring Diagram 110
12.3 Ladder Diagram 111
12.4 Outdoor Temperature Sensor 112
12.5 Outdoor Reset Control 113
12.6 Component Assembly Diagrams and Parts Lists 114