Navien NCB-20LHWE - User Manual

These appliances are for use with natural gas or LPG.
(An LPG conversion kit is included with the boiler.)
Type : B23-B33-B53-C13-C33-C43-C53-C63-C83
Installation &
Operation
Manual
Keep this manual near this boiler for future reference
whenever maintenance or service is required.
WARNING
result, causing property damage or personal injury.
–
other appliance.
–
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliances.
Do not touch any electrical switch; do not use any phone in your building.
Immediately call the National Gas Emergency Helpline on (Freephone) 0800 111999 or your gas
supplier from a neighbour’s phone. Follow the instructions received.
–
Installation and service must be performed by a Gas Safe registered installer, service agency or
the gas supplier.
Condensing System Boiler
Gas Model GC Number
Natural Gas
NCB-20LHWE
NCB-23LHWE
NCB-28LHWE
NCB-33LHWE
41-709-01
41-709-02
41-709-03
41-709-04
LPG
NCB-20LHWE
NCB-23LHWE
NCB-28LHWE
NCB-33LHWE
41-709-05
41-709-06
41-709-07
41-709-08

Summary

Safety Information

About the Boiler

Technical Data

Provides detailed specifications and performance data for the boiler models.

Operating Modes

Explains the different operational states and modes of the boiler.

Installing the Boiler

Choosing an Installation Location

Guidelines for selecting an appropriate installation site, considering safety and access.

Mounting the Boiler to the Wall

Instructions and warnings for securely mounting the boiler unit onto a wall.

Installing the System Piping

Installing a Space Heating System

Details on correctly installing the space heating system and its connections to the boiler.

Connecting the Condensate Drain Line

Instructions for properly connecting the condensate drain line, including material and slope.

Connecting the Gas Supply

Flue System

Selecting a Flue System

Guidance on choosing the correct flue system (coaxial or dual duct) based on installation needs.

Setting the DIP Switches

PCB DIP Switches

Configuration of PCB DIP switches for operation status, model, and country.

Front Panel DIP Switches

Configuration of front panel DIP switches for fuel selection and heat demand.

Connecting Electrical Supplies

Connecting the Power Supply Cables

Procedure for correctly connecting the main power supply cables to the boiler.

Setting the DIP Switches and Parameters for the Terminal blocks 1 and 2

Configuring DIP switches and parameters for terminal blocks to set heat demand and DHW tank.

Terminal block 1 Connection

Installation Check list

Operating the Boiler

Adjusting the Temperature

Setting the Operation Mode

Setting the Parameters

Instructions for qualified professionals to adjust advanced boiler parameters and settings.

Maintaining the Boiler

Draining the Boiler

Protecting the Boiler from Freezing

Maintenance Schedules

Recommended daily, monthly, periodic, and annual maintenance tasks for the boiler.

Appendices

Gas Conversion

Detailed instructions for converting the boiler from natural gas to LPG.

Cleaning the Heat Exchanger

Wiring Diagram

Navien NCB-20LHWE Specifications

General

Brand	Navien
Model	NCB-20LHWE
Category	Boiler
Language	English