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Navien NFB Series - User Manual

Navien NFB Series
232 pages
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WARNING
If the information in these instructions is not followed exactly, a fire or explosion may result, causing
property damage, personal injury, or death.
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other
appliance.
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliance.
Do not touch any electrical switch; do not use any phone in your building.
Immediately call your gas supplier from a neighbor’s phone. Follow the gas suppliers instructions.
If you cannot reach your gas supplier, call the fire department.
Installation and service must be performed by a qualified installer, service agency or the gas
supplier.
The installation must conform with local codes or, in the absence of local codes, the National Fuel
Gas Code, ANSI Z223.1/NFPA 54 and/or CSA B149.1, Natural Gas and Propane Installation Code.
Keep this manual near this boiler for future
reference whenever maintenance or service
is required.
Installation & Operation Manual
NFB Condensing Boilers
Model
NFB-175
NFB-200

Table of Contents

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Navien NFB Series Specifications

General IconGeneral
TypeCondensing Boiler
Fuel TypeNatural Gas or Propane
Heat ExchangerStainless Steel
Vent TypeDirect Vent
Vent Diameter2" or 3"

Summary

Massachusetts Installation Requirements

Notice Before Installation

Key requirements and notifications for installation in Massachusetts.

Safety Information

General Safety Precautions

Details on DANGER, WARNING, and CAUTION symbols and their meanings.

About the Boiler

Included Items

Lists all components found in the boiler packaging.

Accessories

Lists optional accessories available for the boiler.

Specifications

Technical specifications for space heating ratings and water connections.

Components

Diagram showing key internal and external components of the boiler.

Dimensions

Diagrams and table detailing the boiler's physical dimensions and connections.

Rating Plate Information

Details on the boiler's rating plate and its importance for installation.

Installing the Boiler

Removing the Boiler from Packaging

Step-by-step guide for safely removing the boiler from its shipping pallet.

Choosing an Installation Location

Factors to consider for selecting an appropriate installation location.

Mounting the Boiler to the Wall

Instructions for securely mounting the boiler unit onto a wall structure.

Installing the System Piping

Installing a Space Heating System

Guidelines for correctly installing the space heating system.

Air Vent Installation

Proper installation procedure for the air vent connection.

Connecting the Condensate Drain

Steps for connecting the boiler's condensate drain line.

Condensate Neutralizer Kit

Details on the recommended condensate neutralizer kit and its installation.

Filling the System

Procedure for filling the boiler system with water.

Testing the Water System

Steps for performing a fill test on the installed water system.

System Application Examples

Illustrative examples of system piping configurations for various applications.

Electrical Connections Overview

General guidelines and diagrams for electrical connections.

Connecting the Gas Supply

Gas Pipe Sizing Tables

Tables for determining appropriate gas pipe sizing based on length and capacity.

Measuring Inlet Gas Pressure

Procedure for measuring and verifying the boiler's inlet gas pressure.

Venting the Boiler

Selecting a Vent Type

Guidance on choosing the appropriate vent type for the boiler.

Selecting Vent Pipe Materials

Approved materials and guidelines for vent pipe selection.

Measuring Vent Length

How to measure vent length and account for elbows.

Terminating the Vent

Guidelines and examples for proper vent termination.

Setting the DIP Switches

DIP Switch 1 Configuration

Settings for operation status and model/capacity.

DIP Switch 2 Configuration

Settings for gas type, temperature control, and thermostat.

Connecting the Power Supply

Installing a Cascade System

Connecting Water Supplies

Options for plumbing cascade systems and connecting water supplies.

Piping Sizes and Considerations

Guidelines for pipe diameters and flow rates in cascade systems.

Connecting Communication Cables

How to connect communication cables for cascade operation.

Configuring Communication Settings

Steps to configure communication settings for a cascade system.

Installing a Common Vent System

About the Common Vent System

Overview of the common vent system and its benefits.

Determining Common Vent Length

Method for calculating the required length of a common vent system.

Navien Backflow Damper (Back-draft Damper)

Installation and function of the Navien backflow damper.

Starting the Common Vent System

Procedures for assembling and starting the common vent system.

Connecting and Terminating Vent Pipe

How to connect and terminate the vent pipes for a common vent system.

Setting Up the Common Vent System

Steps for configuring the common vent system settings.

Common Vent Termination Clearances

Required clearances for common vent system terminations.

Installing a Condensate Drain

How to install a condensate drain for the common vent system.

Exhaust Vent Termination Clearances (For Direct Vent)

Clearances required for direct vent exhaust terminations.

Maintenance

Procedures for maintaining the backflow damper.

Installation Checklist

Operating the Boiler

Turning the Boiler On or Off

Basic procedure for powering the boiler on and off.

Adjusting the Temperature

How to adjust space heating and DHW temperatures.

Accessing Basic Menu Items

Navigating and using the basic menu functions on the control panel.

Accessing Advanced Menu Items

Accessing and using advanced menu settings and diagnostics.

Appendixes

Gas Conversion

Procedure for converting the boiler from Natural Gas to Propane Gas.

Wiring Diagram

Electrical wiring diagrams for the boiler system.

Ladder Diagram

Electrical ladder diagram illustrating system logic.

Outdoor Temperature Sensor

Installation guidelines for the outdoor temperature sensor.

Outdoor Reset Control

Information on the Outdoor Reset Control feature and its settings.

Component Assembly Diagrams

Diagrams and parts lists for boiler component assemblies.

Getting Service

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