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Navien NCB-250/150H User Manual

Navien NCB-250/150H
145 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.
H
NSF/ANSI 372
Keep this manual near this boiler for future reference
whenever maintenance or service is required.
* The wetted surface of this product contacted by consumable water
contains less than one quarter of one percent (0.25%) of lead by weight.
Installation & Operation Manual
NCB-H Condensing Combi-Boilers
Model
NCB-190/060H
NCB-190/080H
NCB-240/110H
NCB-240/130H
NCB-250/150H

Table of Contents

Other manuals for Navien NCB-250/150H

Questions and Answers:

Navien NCB-250/150H Specifications

General IconGeneral
CategoryBoiler
BrandNavien
ModelNCB-250/150H
Fuel TypeNatural Gas / Propane
Min. Input (Heating)15, 000 BTU/h
Min. Input (DHW)15, 000 BTU/h
Heating Capacity150, 000 BTU/h
Efficiency95% AFUE
Gas Connection Size3/4" NPT
TypeCombination Boiler
DHW Flow Rate4.8 GPM
Water Connection Size3/4" NPT
Vent Size3 inches
Water Flow Rate (GPM)9.8 GPM at 45°F rise
Vent Diameter (inches)3 inches

Summary

General Safety Precautions

Danger Symbols and Definitions

Explains safety symbols (DANGER, WARNING, CAUTION) and their meanings.

Gas Leak and Flammable Product Safety

Guidelines for handling gas leaks and storing flammable products near the boiler.

Boiler Operation and Usage Warnings

General Operating Warnings

Crucial warnings for operating the boiler safely and preventing damage.

Hot Water Safety and Scald Prevention

Dangers of High Water Temperatures

Explains the risk of scalding from hot water and provides preventative measures.

Boiler Rating Plate Information

Understanding the Rating Plate

Explains how to interpret the boiler's rating plate for installation compatibility.

Boiler Installation Procedures

Selecting an Installation Location

Guidelines for choosing a suitable and safe location for boiler installation.

Installation Site Considerations

Required Installation Clearances

Specifies the minimum clearances needed around the boiler for safety and service.

Mounting and Environment for Boiler Installation

Mounting the Boiler to the Wall

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

Boiler Handling and Wall Mounting Precautions

System Piping Installation

Installing a Space Heating System

Guidelines for correctly installing the space heating system piping.

Space Heating System Essentials

Pressure Relief Valve Installation and Safety

Pressure Relief Valve Installation Guidelines

Detailed instructions and safety precautions for installing the pressure relief valve.

System Piping Configurations

Installing a Domestic Hot Water System

Guidelines for installing the domestic hot water (DHW) system.

Domestic Hot Water System Components

DHW System Piping and Safety

Condensate Drain Connection

Condensate Disposal Options and Connection

Details on how to connect and dispose of boiler condensate safely and according to code.

Filling the Boiler System

Water System Testing and Fill Connections

Performing a Water System Fill Test

Steps to test the water system after installation to ensure proper filling and leak checks.

System Application Considerations

Zone System Piping Configurations

Hot Water Recirculation and Pre-Heat Modes

Advanced Recirculation Features

Electrical Connections and Wiring

Zone System Wiring Diagrams

Zone System Wiring with 24VAC Connections

DHW Recirculation and Zone System Wiring

DHW Recirculation Wiring with 24VAC

Zone Valve System Wiring

Zone Valve System Wiring with 24VAC Connections

Advanced Zone Control Wiring

Gas Supply Connection Procedures

Gas Supply Connection Safety Warnings

Critical safety warnings before connecting the gas supply to the boiler.

Gas Supply Connection Details

Connecting the Gas Supply Line

Step-by-step instructions for connecting the gas supply line to the boiler.

Gas Pipe Sizing

Propane Gas and Inlet Pressure

Inlet Gas Pressure Measurement Procedure

Combustion Air and Venting Guidelines

Combustion Air Quality and Contaminants

Information on ensuring clean combustion air and avoiding corrosive contaminants.

Boiler Venting Requirements

General Venting Guidelines and Safety

Essential rules and safety precautions for properly venting the boiler.

Vent Pipe Installation and Termination

Connecting Vent Pipe to Boiler Collar

Instructions for properly connecting the vent pipe to the boiler's vent collar.

Vent Installation Detector (VID) Functionality

Proper Vent Pipe Installation and VID Verification

Selecting Vent Types and Clearances

Selecting Vent Pipe Materials

Recommended Vent Materials and Cautions

Lists approved vent pipe materials and warnings about mixing components.

Measuring Vent Length and Elbows

Vent Termination Options

DIP Switch Settings Configuration

DIP Switch 2 (8 Switch Unit) Settings

Configuration options for DIP Switch 2, covering gas type, altitude, and thermostat.

DIP Switch Settings Notes and Cautions

Connecting the Power Supply

Power Supply Connection Safety and Warnings

Critical safety warnings and guidelines for connecting the boiler's power supply.

Cascade System Installation

Cascade System Piping Sizes

Cascade System Recirculation

Cascade System Recirculation Without Return Line

Connecting Communication Cables

Cascade System Communication Management

Common Vent System Installation

Guidelines for Common Vent Systems

Essential guidelines and safety precautions for installing common vent systems.

Common Vent System Clearances and Termination

Common Vent System Components and Materials

Vent Pipe Pitch and Cement Connections

Determining Common Vent System Length

Navien Common Vent Collar Kit

Starting the Common Vent System

Connecting Vent Pipe to Common Vent Collar

Assembling Common Vent Wye Joints

Connecting and Terminating Common Vent Pipes

Common Vent System Setup and Clearances

Installing Condensate Drain for Common Vent

Condensate Drain Hose Loop Installation

Direct Vent Exhaust Termination Clearances

Common Vent Collar Kit Maintenance

Boiler Installation Checklist

Boiler Installation and Gas Supply Checks

Checklist items for installing the boiler and connecting the gas supply.

System Installation Checklist

Space Heating, Pressure Relief Valve, Condensate Drain Checks

Checklist items for space heating, pressure relief valve, and condensate drain installation.

Final Installation and Operation Checks

Venting, Power, DIP Switch, and Operation Checks

Final checklist items for venting, power, DIP switches, and initial boiler operation.

Operating the Boiler

First-Time Boiler Operation Safety

Critical safety instructions and warnings before operating the boiler for the first time.

Boiler Power On/Off Procedures

Turning the Boiler On and Off Safely

Step-by-step instructions for safely turning the boiler on and off.

Boiler Start-Up Wizard

Completing the Initial Setup Wizard

Guide through the initial setup wizard for configuring boiler settings.

Adjusting Boiler Temperatures

Adjusting Space Heating Temperature

How to adjust the setpoint for space heating water temperature.

Adjusting Domestic Hot Water Temperature

How to adjust the setpoint for domestic hot water temperature.

Boiler Reset and Menu Navigation

Resetting the Boiler After Errors

Procedures for resetting the boiler to resolve operational issues.

Basic Boiler Information Display

Configuring Heating and DHW Operations

Setting Space Heating Operation Parameters

How to configure settings for space heating operation modes.

Setting Domestic Hot Water (DHW) Operation

How to configure settings for domestic hot water operation.

Advanced Heating and DHW Settings

Outdoor Reset Control Functionality

Explains the Outdoor Reset Control feature for energy efficiency.

Configuring DHW Operation Settings

Details on setting DHW operation modes like Combi Pre-Heat.

DHW Recirculation and Combi Pre-Heat

Combi Pre-Heat Mode Settings

Options for configuring the combi pre-heat feature for DHW.

DHW Recirculation Type Settings

Settings for different DHW recirculation types (No Recirculation, Combi Pre-Heat, External).

External Recirculation and Cascade System Operation

System Monitoring and Error Handling

Viewing Error History and System Data

How to view past errors and other system information.

Boiler Display and Service Information

Boiler Input and Output Status

Setting Operation Parameters

Adjusting Space Heating Temperature Parameters

Setting minimum and maximum temperatures for space heating supply and return.

Advanced Operation Parameter Settings

Setting Heating Capacity and Pump Delays

Configuring parameters like heating capacity limits, pump delays, and recirculation times.

Boiler Service Notifications and Cascade Configuration

Cascade System Management

System Diagnosis and External Connections

Diagnosing Boiler System Issues

Running diagnostic tests to identify and troubleshoot boiler system problems.

Boiler System Diagnostic Tests

Testing Boiler Pump, Zone Pumps, and Valves

Performing tests on pumps, zone valves, mixing valves, and flow control valves.

Special Operation Modes and Air Purge

Setting Special Operation Modes

Configuring special operation modes like Normal, MIN, MAX, and stage settings.

Operating in Air Purge Mode

Instructions for running the air purge mode to remove air from the heating system.

Understanding Boiler Error Codes

Error Code Definitions and Remedies

Explains error codes and provides self-diagnostic or action steps for troubleshooting.

Boiler Error Code Troubleshooting

Troubleshooting Common Error Codes

Further details on error codes and their corresponding troubleshooting actions.

Appendixes

Gas and High Altitude Conversion Procedures

Instructions for converting the boiler for propane gas or high altitude installation.

Gas and Altitude Conversion Tools and Orifices

Gas Conversion: Accessing Components

Gas Valve Assembly and O-Ring Inspection

DIP Switch Settings for Gas Type and Altitude

Setting DIP Switches for Gas and Altitude

How to set DIP switches for propane gas and high altitude configurations.

Gas/Air Ratio Measurement and Adjustment

Using Combustion Analyzer for Gas/Air Ratio

Procedure for measuring and adjusting the gas/air ratio using a combustion analyzer.

Gas Valve Adjustment and Offset Measurement

Detailed Wiring Diagram

NCB-H Boiler Wiring Schematics

Comprehensive wiring diagram for the NCB-H boiler, showing all connections.

Boiler System Ladder Diagram

Outdoor Temperature Sensor and Reset Control

Installing the Outdoor Temperature Sensor

Instructions for installing the outdoor temperature sensor.

Configuring the Outdoor Reset Control

How to configure the Outdoor Reset Control feature for energy efficiency.

Outdoor Reset Control Temperature Settings

Burner Assembly Diagram

Waterway Assembly Diagram

Fan (Gas) Assembly Diagram

Getting Service and Technical Support

Contacting Technical Support for Service

Information on how to contact technical support for service and warranty issues.

Information Needed for Technical Support

Details on what information to have ready when contacting technical support.

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