3Contents
7. Connecting the Power Supply 74
8. Installing a Cascade System
75
8.1 Connecting Water Supplies 75
8.2 Cascade System - Recirculation System
Application Example
78
8.3 Connecting the Communication Cables
80
9. Installing a Common Vent System 82
9.1 About the Common Vent System 82
9.2 Navien Common Vent Collar Kit (Back-
draft Damper)
87
9.3 Starting the Common Vent System
88
9.4 Connecting and Terminating the Vent
Pipe
91
9.5 Setting Up the Common Vent System
92
9.6 Common Vent Termination Clearances
92
9.7 Installing a Condensate Drain
93
9.8 Exhaust Vent Termination Clearances (For
Direct Vent)
95
9.9 Maintenance
97
10. Installation Checklist 98
11. Operating the Boiler
101
11.1 Operating the Boiler for the First Time 101
11.2 Turning the Boiler On or Off
102
11.3 Start-Up Wizard
103
11.4 Adjusting the Temperature
103
11.5 Accessing Basic Menu Items
105
11.6 Accessing Advanced Menu Items
112
11.7 Understanding Error Codes
121
12. Appendixes 123
12.1 Gas & High Altitude Conversion 123
12.2 Wiring Diagram
131
12.3 Ladder Diagram
132
12.4 Outdoor Temperature Sensor
133
12.5 Outdoor Reset Control
133
12.6 Component Assembly Diagrams and
Parts Lists
135
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 Choosing an Installation Location 15
2.2 Mounting the Boiler to the Wall
17
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
26
3.4 Filling the System
29
3.5 Testing the Water System
30
3.6 Considerations for System Applications
31
3.7 Examples of Electrical Connections
40
4. Connecting the Gas Supply 51
4.1 Gas Pipe Sizing Tables 54
4.2 Measuring the Inlet Gas Pressure
55
5. Venting for Combustion Air 57
5.1 Venting the Boiler 58
5.2 About the Vent Installation Detector
60
5.3 Selecting a Vent Type
62
5.4 Selecting Vent Pipe Materials
66
5.5 Measuring Vent Length
67
5.6 Terminating the Vent
68
6. Setting the DIP Switches 72
6.1 DIP Switch 1 (6 switch unit) 72
6.2 Dip Switch 2 (8 switch unit)
72
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