Navien NFB-399C 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
13
2. Installing the Boiler 14
2.1 Removing the Wood Pallet from the Boiler 14
2.2 Choosing an Installation Location
15
2.3 Mounting the Boiler to the Wall
17
3. Installing the System Piping 19
3.1 Installing a Space Heating System 19
3.2 Connecting the Condensate Drain
27
3.3 Filling the System
29
3.4 Testing the Water System
30
3.5 Considerations for System Applications
31
3.6 Examples of Electrical Connections
36
3.7 Connecting External devices (Field Wiring Guidelines)
45
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 54
5.2 Selecting Vent Pipe Materials
57
5.3 Measuring Vent Length
58
5.4 Terminating the Vent
58
5.5 Removing the Internal Air Filter
61
6. Setting the DIP Switches 63
6.1 DIP Switch 1 (6 switch unit) 63
6.2 DIP Switch 2 (8 switch unit)
63
7. Connecting the Power Supply 64
8. Installing a Cascade System
65
8.1 Connecting Water Supplies 65
8.2 Connecting the Communication Cables
71
9. Installing a Common Vent System 72
9.1 About the Common Vent System 72
9.2 Navien Backflow Damper (Back-draft Damper)
77
9.3 Starting the Common Vent System
78
9.4 Connecting and Terminating the Vent Pipe
81
9.5 Setting up the Common Vent System
82
9.6 Common Vent Termination Clearances
82
9.7 Installing a Condensate Drain
84
9.8 Exhaust Vent Termination Clearances (For Direct Vent)
85
9.9 Maintenance
86
10. Installation Checklist 87
11. Operating the Boiler
90
11.1 Turning the Boiler on or off 90
11.2 Adjusting the Temperature
91
11.3 About the Operating Status Information
92
11.4 Resetting the Boiler
92
11.5 Accessing Basic Menu Items
92
11.6 Accessing Advanced Menu Items
99
11.7 Understanding Error Codes
109
12. Appendixes 110
12.1 Gas & High Altitude Conversion 110
12.2 Wiring Diagram
116
12.3 Ladder Diagram
117
12.4 Outdoor Temperature Sensor
118
12.5 Outdoor Reset Control
119
12.6 Component Assembly Diagrams and Part Lists
120

Navien NFB-399C Specifications

General

Brand	Navien
Model	NFB-399C
Category	Boiler
Language	English