Table Of Contents - Navien NFC-175 Installation & Operation Manual

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