Navien NHB Series, Installation & Operation Manual

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3 Contents
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