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3.6.5 EXPANSION VESSEL
The appliance has an integral expansion vessel to accom-
modate the increased volume of water when the system is
heated. It can accept up to 9 litres of expansion from within
the system, generally this is sufficient, however if the system
has an unusually high water content, it may be necessary to
provide additional expansion capacity (see 7.20).
3.6.6 FILLING POINT
A method for initial filling of the system and replacing water lost
during servicing etc. directly from the mains supply, is required
(see "Fig. 17"). This method of filling should comply with the cur-
rent Water Supply (Water Fittings) Regulations 1999 and Water
Bylaws 2000 (Scotland). If an alternative location is preferred,
it should be connected as detailed in Fig. 8.
3.6.7 LOW PRESSURE SEALED SYSTEM
An alternative method of filling the system would be from an
independent make-up vessel or tank mounted in a position at
least 1 metre above the highest point in the system and at least
5 metres above the boiler (see "Fig. 9").
The cold feed from the make-up vessel or tank must be fitted
with an approved non-return valve and stopcock for isolation
purposes. The feed pipe should be connected to the return pipe
as close to the boiler as possible.
3.6.8 FREQUENT FILLING
Frequent filling or venting of the system may be indicative
of a leak. Care should be taken during the installation of the
appliance to ensure all aspects of the system are capable of
withstanding pressures up to at least 3 bar.
3.7
ELECTRICAL SUPPLY
The appliance is supplied for operation on 230V @ 50Hz electri-
cal supply; it must be protected with a 3-amp fuse. The method
of connection to the mains electricity supply must allow for
complete isolation from the supply. The preferred method is by
using a double-pole switch fused spur with a contact separation
of at least 3,5mm (3° high-voltage category). The switch must
only supply the appliance and its corresponding controls, i.e.
time clock, room thermostat, etc. Alternatively an un-switched
shuttered socket with a fused 3-pin plug both complying with
BS 1363 is acceptable.
NOTE
Vokera Ltd. cannot guarantee the performance or reliability of
the appliance if/when it is supplied via an invertor or generator;
in particular those that incorporate a 'floating' earth or 'modified'
sine wave.
Warning!
This appliance must be earthed.
3.8
MOUNTING ON A COMBUSTIBLE SURFACE
The appliance can be mounted on a wall of combustible ma-
terial without any requirement to fit any additional protective
(fire-resistant) material.
3.9
TIMBER FRAMED BUILDINGS
If the appliance is to be fitted in a timber framed building, it
should be fitted in accordance with the Institute of Gas Engineers
publication (IGE/UP/7) 'Guide for Gas Installations in Timber
Frame Buildings'.
3E GENERAL REQUIREMENTS (EIRE)
This appliance must be installed by a competent person in
accordance with and defined by, the Standard Specification
(Domestic Gas Installations) Declaration (I.S. 813).
3.1E RELATED DOCUMENTS
The installation of this boiler must be in accordance with the rel-
evant requirements of the local building regulations, the current
ETCI National Rules for Electrical Installations and the bylaws
of the local water undertaking.
It should be in accordance also with any relevant requirements
of the local and/or district authority.
ATTENTION
The use of PPE (Personal Protective Equipment) such as but
not limited to gloves, mask, safety glasses, etc. is strongly re-
commended whenever carrying out the installation, repair, or
maintenance of this appliance – please pay particular attention
to:
3.10 WATER TREATMENT
Vokèra recommend that an inhibitor - suitable for use with
stainless-steel heat exchangers - is used to protect the boiler
and system from the effects of corrosion and/or electrolytic
action. The inhibitor must be administered in strict accordance
with the manufacturers instructions*.
*Water treatment of the complete heating system - including
the boiler - should be carried out in accordance with BS 7593
and the Domestic Water Treatment Association's (DWTA)
code of practice. Vokera recommend that water treatment be
carried out in accordance with the Benchmark Guidance on
water treatment in central heating systems. If water treatment
products are to be used, then they must be entirely suitable for
use with an stainless steel heat exchanger. Any water treat-
ment product, must be administered in strict accordance with
the manufacturer's instructions.
If the appliance is to be installed to an existing system; water
treatment and flushing of the complete heating system should
be carried out in accordance with BS 7593 and the Benchmark
Guidance on water treatment in central heating systems.
control valve
temporary
connection
ow pipe
Make-up vessel
Fig. 8
or tank
Automatic
air-vent
Non-return
valve
Fig. 9
• Sharp edges that may be encountered when:- handling or
lifting the appliance, removing parts, etc. during installation
and maintenance
• Airborne particles that may be released and/or disturbed when
cleaning or removing components during maintenance
• Water treatment chemicals that could have been added to
the system water may spill from the appliance and or com-
ponents during maintenance
Please refer to an appropriate Health and Safety document
such as HSE L23 (UK) or S.I. 299 (Ireland), for more detailed
advice on safe working practices and procedures.
3.2E LOCATION OF APPLIANCE
The appliance may be installed in any room or internal space,
although particular attention is drawn to the requirements of the
current ETCI National Rules for Electrical Installations, and I.S.
813, Annex K.
When an appliance is installed in a room or internal space containing
control
valve
double
check- valve
supply
pipe
Stopcock
Heating
return
17
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