6 Safety Information
General Installation Guidelines
Navien ensures that this product contains no harmful
substances and that no harmful materials have been used in its
manufacture.
Current legislation must be taken into account on installing
this appliance, and it must be installed in a place with suitable
ventilation.
The boiler must be installed by an installer authorised by the
Ministry of Industry and it must be started up by an Ocial
Technical Assistance Service authorised by Navien.
The requirements included in the following regulations must be
observed on installing the boiler:
-The Gas Installation Regulation.
-The Technical Building Code.
-The Regulation for Heating Installations in Building.
-The Low Voltage Regulation.
Installing the system piping
The boiler isequippedwith an internal relief valve. All systems
must be capable of sustaining pressure of up to 3 bar.
If the system pressure exceeds 2.65 bar at the maximum
heating temperature, an additional expansion vessel must be
installed on the central heating return.
The air vent is required in the system during lling.
CAUTION
The boiler is equipped with an internal
bypass valve. The internal bypass valve
is not intended to replace an external
bypass valve. An external automatic
bypass valve is required if a zone valve
has been connected to the system.
Gas Conversion
The boiler is congured for natural gas. If LPG conversion is
required, use the conversion kit supplied with the boiler.
The Codes of good practice and regulations refer to the
latest versions of the same.
The installation must also comply with the following European
Standards:
Standard Description
UNE-EN 13831:2008Closed expansion vessels with
diaphragm.
UNE-EN 1856 Metal chimneys
UNE-EN 13384 Chimneys
UNE-EN 13779 Ventilation
UNE-EN ISO 16484Building control systems.
UNE-EN 14336Heating systems in buildings.
UNE-EN 15502-1Gas-red heating boilers
Part 1: General Requirements and tests
UNE-EN 15502-2-1
Gas-red heating boilers
Part 2-1: Specic standard for type
C appliances and type B2, B3 and B5
appliances of a nominal heat input not
exceeding 1000 kW
UNE-EN 13203:2007Domestic Hot Water
UNE-EN 303-7:2008Heating boilers.
EC Conformity Declaration
0063
Navien, hereby declares that the boiler models:
NCB-20LHWE, NCB-23LHWE, NCB-28LHWE, NCB-33LHWE
to which this declaration refers, conform to and comply with
the essential requirements of the following applicable European
Standards and Directives.
Gas appliances dna734NEsdradnatSCE/241/9002evitceriD:
EN 15502
Boiler Eciency: Directives 92/42/EEC and
93/68/EEC
Regulation (EN) No. 813/2013
Standards EN 15502
Low voltage: Directives 73/23/EEC and
93/68/EEC Standard EN 60335-1, EN 60335-2-30,
EN 60335-2-51, EN 50165
Electro-magnetic Compatibility: Directive 2004/108/EC
Standards EN 55014
Pressure Vessels: Directive 97/23/EEC
Navien, manufactures its products using a Quality Assurance
system in compliance with Standard EN-ISO 9001:2000.
