INSTALLATION
TECHNICAL DOCUMENTATION 13
VENTILATION
The ventilation of the installation room should conform to current gas regulations.
GAS CONNECTION
The gas connection is located on the bottom of the appliance (see page 09). It should be installed by a
competent installer in accordance with the applicable national standards.
A suitable isolation valve should be installed for each boiler and should be in an accessible position. Care
should be taken when sizing the pipework to ensure the supply is sufficient for the maximum load operation of
the boiler.
The pressure on the inlet side of the appliance should be reduced to 20 mbar for natural gas (G20) and no
more than 50 mbar for propane (G31). Under full load conditions the measured gas pressure at the gas valve
should be no less than 17 mbar for natural gas (G20) and 30 mbar for propane (G31).
WATER CONNECTIONS
The boiler is designed for sealed systems only and should not be used for open vented systems. For information
and sizing of sealed system equipment, please refer to our pressurisation management brochure.
It is recommended that manually operated valves should be installed between the boiler flow and return
connections and the system.
It is also recommended that the flow and return pipes are securely fixed with brackets. This prevents damage
and makes maintenance easier.
ELECTRICAL CONNECTIONS
The electrical connections should be installed by a competent installer in accordance with applicable
national standards.
The appliance is fully wired in accordance with the electrical diagrams delivered with the appliance.
Electrical terminal connections are located at the base of the boiler and are protected by a metal enclosure.
Access to the terminals is gained by removing the boiler front panel and unscrewing the lid from the
enclosure. Suitable cable entry points are supplied in the form of cable glands.
The appliance is suitable for a 230 V 50 Hz power supply with live / neutral / earth and is polarity sensitive. The
installer should use a local two pole isolating switch with a contact opening of at least 3mm in the 230 V supply
to the boiler. A permanent earth must also be installed. In order to prevent problems due to electromagnetic
radiation, screened cables should be used for all control wiring between the boiler and external
management systems. The screening should be earthed on both sides in accordance with current EMC
directives.
As the boiler incorporates electrical equipment there is an obligation to the installer to ensure that the boiler is
correctly earthed.
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