Navien NFB Series User Manual

3Contents
Contents
1. About the Boiler 6
1.1 Included Items 6
1.2 Accessories
6
1.3 Specifications
7
1.4 Components
9
1.5 Dimensions
11
1.6 Rating Plate
12
2. Installing the Boiler 13
2.1 Removing the Wood Pallet from the boiler 13
2.2 Choosing an Installation Location
14
2.3 Mounting the Boiler to the Wall
16
3. Installing the System Piping 17
3.1 Installing a Space Heating System 17
3.2 Connecting the Condensate Drain
24
3.3 Filling the System
27
3.4 Testing the Water System
27
3.5 Examples of System Applications
28
3.6 Examples of Electrical Connections
34
4. Connecting the Gas Supply 46
4.1 Gas Pipe Sizing Tables 48
4.2 Measuring the Inlet Gas Pressure
49
5. Venting the Boiler 51
5.1 Selecting a Vent Type 52
5.2 Selecting Vent Pipe Materials
55
5.3 Measuring Vent Length
56
5.4 Terminating the Vent
56
6. Setting the DIP Switches 59
6.1 DIP Switch 1 (6 switch unit) 59
6.2 Dip Switch 2 (8 switch unit)
59
7. Connecting the Power Supply 60
8. Installing a Cascade System
61
8.1 Connecting Water Supplies 61
8.2 Connecting the Communication Cables
65
9. Installing a Common Vent System 66
9.1 About the Common Vent System 66
9.2 Navien Backflow Damper (Back-draft Damper)
71
9.3 Starting the Common Vent System
72
9.4 Connecting and Terminating the Vent Pipe
74
9.5 Setting Up the Common Vent System
75
9.6 Common Vent Termination Clearances
75
9.7 Installing a Condensate Drain
77
9.8 Exhaust Vent Termination Clearances (For Direct Vent)
78
9.9 Maintenance
79
10. Installation Checklist 80
11. Operating the Boiler
83
11.1 Turning the Boiler On or Off 83
11.2 Adjusting the Temperature
83
11.3 Accessing Basic Menu Items
85
11.4 Accessing Advanced Menu Items
89
12. Appendixes 97
12.1 Gas Conversion 97
12.2 Wiring Diagram
102
12.3 Ladder Diagram
103
12.4 Outdoor Temperature Sensor
104
12.5 Outdoor Reset Control
105
12.6 Component Assembly Diagrams and Parts Lists
106

Navien NFB Series Specifications

General

Brand	Navien
Model	NFB Series
Category	Boiler
Language	English