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Navien NHB Series User Manual

Navien NHB Series
135 pages
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WARNING
If the information in these instructions is not followed exactly, a re or explosion may result, causing
property damage, personal injury, or death.
Do not store or use gasoline or other ammable 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 re department.
Installation and service must be performed by a qualied 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-301C
NFB-399C

Table of Contents

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Navien NHB Series Specifications

General IconGeneral
TypeCondensing Boiler
EfficiencyUp to 95% AFUE
Fuel TypeNatural Gas or Propane
Vent TypeDirect Vent
Vent Diameter2" or 3"
Heat Exchanger MaterialStainless Steel
Water Connections3/4" NPT
DimensionsVaries by model
WeightVaries by model
Warranty5-Year Parts

Summary

Installation & Operation Manual

Safety Warnings and Procedures

Crucial safety warnings, gas leak procedures, and installation requirements.

Massachusetts Installation Requirements

Notice Before Installation

Pre-installation notice specific to Massachusetts state regulations.

Carbon Monoxide Detector Requirements

Mandated installation and certification of carbon monoxide detectors.

General Safety Information

Hazard Symbol Explanations

Explains the meaning of hazard symbols used in the manual.

Gas and Flammable Material Safety

Precautions regarding gas handling and storage of flammable substances.

About the Navien NFB Boiler

Included Items and Accessories

Lists included items and optional accessories for the boiler.

1.3 Technical Specifications

Technical specifications and ratings for the boiler models.

1.4 Key Boiler Components

Identifies key internal components of the boiler through diagrams.

1.5 Dimensions and Connections

Provides physical dimensions and connection port details for the boiler.

1.6 Rating Plate Information

Details found on the boiler's rating plate and their significance.

Installing the Boiler

2.1 Pallet Removal and Mounting

Procedures for boiler installation, location selection, and wall mounting.

Installing the System Piping

Piping Preparation and Space Heating Installation

Essential steps and guidelines for installing the space heating system piping.

Condensate Drain and System Filling

Instructions for connecting the condensate drain and filling the system.

Water System Testing and Applications

Water system testing, application considerations, and air removal.

Electrical Connections and Wiring Diagrams

Electrical Connection Warnings and Guidelines

Critical warnings and guidelines for safe electrical connections.

Wiring Diagrams (Zone Pump, DHW Tank)

Wiring diagrams for zone pump, DHW tank, and other system configurations.

Connecting External Devices

Thermostat, DHW, and Sensor Connections

Instructions for connecting thermostats, DHW devices, and sensors.

Connecting the Gas Supply

Gas Supply Connection Warnings and Procedure

Essential warnings and steps for safely connecting the gas supply.

Gas Pipe Sizing and Pressure Measurement

Gas pipe sizing tables and procedures for measuring inlet gas pressure.

Venting the Boiler

Venting Warnings, Guidelines, and Type Selection

Critical warnings, guidelines, and type selection for proper boiler venting.

Vent Pipe Materials and Termination

Approved vent pipe materials and procedures for vent termination.

5.5 Removing the Internal Air Filter

Instructions for accessing and replacing the internal air filter.

Setting the DIP Switches

DIP Switch Configuration for Gas, Altitude, and Operation

Configuring gas type, altitude, and operation settings via DIP switches.

Connecting the Power Supply

Power Supply Connection Warnings and Guidelines

Critical warnings and steps for safe power supply connection.

Installing a Cascade System

Cascade System Installation and Configuration

Guidelines for water supply, communication cables, and application examples for cascade systems.

Installing a Common Vent System

Common Vent System Overview, Guidelines, and Setup

Overview, guidelines, and setup procedures for installing a common vent system.

Termination Clearances and Maintenance

Specifies required termination clearances and maintenance for common vent systems.

Installation Checklist

Comprehensive Installation Checklist

Checklist covering all phases of boiler installation, connection, and setup.

Operating the Boiler

Basic Boiler Operation and Temperature Adjustment

Turning the boiler on/off and adjusting space heating and DHW temperatures.

Status Information and Boiler Reset

Understanding operating status displays and procedures for resetting the boiler.

Setting Space Heating Operation

Configuring space heating control methods, pump settings, and zone settings.

Setting DHW Operation and Parameters

Configuring DHW demand, control methods, temperatures, and priority settings.

Viewing Error History and System Information

Viewing error logs and other system operational data.

Setting BMS and Communication Information

Configuring Building Management System (BMS) communication settings.

Setting Schedules and General Options

Configuring schedules, display settings, and memory backup.

Accessing Advanced Menu Items

Navigating advanced menus and viewing service information.

11.6.3 Setting Operation Parameters

Adjusting detailed boiler operation parameters, requiring professional setup.

11.6.4 Configuring a Cascade System

Steps for setting up and configuring the boiler for cascade operation.

Setting the Operation Strategy

Selecting operational strategies (Comfort, Eco, Boost, Custom) for efficiency.

External Connections and System Diagnostics

Configuring external connections and running system diagnostic tests.

Setting Operation Modes and Air Purge

Selecting special operation modes and performing air purge procedures.

11.7 Understanding Error Codes

A table of error codes, their reasons, and self-diagnostic actions.

Appendixes

Gas & High Altitude Conversion

Instructions and guidelines for converting the boiler for propane or high altitude use.

Orifice Identification and Sizing

Information on identifying and selecting correct gas orifices for different conditions.

12.2 Wiring Diagram

Detailed wiring diagrams for boiler connections and accessories.

12.3 Ladder Diagram

Ladder diagrams illustrating the boiler's control logic and connections.

12.4 Outdoor Temperature Sensor Installation

Guidelines for installing the outdoor temperature sensor.

12.5 Outdoor Reset Control Configuration

Explanation and configuration of the Outdoor Reset Control feature for energy efficiency.

Component Assembly Diagrams and Part Lists

Exploded views and part lists for boiler assemblies.

Getting Service Information

Contact Technical Support and Information Needed

How to obtain service and required details for technical support.

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