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a bath or shower, the appliance or any control pertaining to it must
not be within reach of a person using the bath or shower.
The location chosen for the appliance must permit the provision
of a safe and satisfactory flue and termination. The location must
also permit an adequate air supply for combustion purposes and an
adequate space for servicing and air circulation around the appli-
ance. Where the installation of the appliance will be in an unusual
location special procedures may be necessary, refer to I.S. 813 for
detailed guidance on this aspect.
A compartment used to enclose the appliance must be designed
and constructed specifically for this purpose. An existing compart-
ment/cupboard may be utilised provided that it is modified to suit.
This appliance is not suitable for external installation.
3.3E GAS SUPPLY
The gas meter – as supplied by the gas supplier – must be
checked to ensure that it is of adequate size to deal with the
maximum rated input of all the appliances that it serves. Installation
pipes must be fitted in accordance with I.S. 813.
Pipe work from the meter to the appliance must be of adequate
size. Pipes of a smaller size than the appliance gas inlet connection
must not be used. The installation must be tested for
tightness in accordance with I.S. 813.
If the gas supply serves more than one appliance, it must be
ensured that an adequate supply is maintained to each appliance
when they are in use at the same time.
NOTE
It is recognised that 'pressure loss' through the gas cock and gas
valve may result in a pressure drop of approximately 2mbar between
the gas meter and gas valve inlet test point; this will not impair the
performance of the appliance, provided that a dynamic pressure of
18mbar is available at the appliance inlet.
3.4E FLUE SYSTEM
The terminal should be located where the dispersal of combustion
products is not impeded and with due regard for the damage and
discoloration that may occur to building products located nearby. The
terminal must not be located in a place where it is likely to cause a
nuisance (see I.S. 813).
In cold and/or humid weather, water vapour will condense on leaving
the terminal; the effect of such pluming must be considered.
If installed less than 2m above a pavement or platform to which
people have access (including balconies or flat roofs) the terminal
must be protected by a guard of durable material. The guard must
be fitted centrally over the terminal. Refer to I.S. 813, when the
terminal is 0.5 metres (or less) below plastic guttering or 1 metre
(or less) below painted eaves.
3.5E AIR SUPPLY
The following notes are intended for general guidance only.
This appliance is a room-sealed, fan-flued boiler, consequently it
does not require a permanent air vent for combustion air supply.
When installed in a cupboard or compartment, ventilation for cooling
purposes is also not required.
3.6E WATER CIRCULATION
Specific recommendations are given in I.S. 813. The following notes
are for general guidance only.
3.6.1E PIPEWORK
It is recommended that copper tubing be used in conjunction with
soldered capillary joints.
Where possible pipes should have a gradient to ensure air is car-
ried naturally to air release points and that water flows naturally to
drain cocks.
Except where providing useful heat, pipes should be insulated to
avoid heat loss and in particular to avoid the possibility of freezing.
Particular attention should be paid to pipes passing through ventilated
areas such as under floors, loft space and void areas.
3.6.2E AUTOMATIC BY-PASS
The appliance has a built-in automatic by-pass, consequently there
is no requirement for an external by-pass, however the design of the
system should be such that it prevents boiler 'cycling'.
3.6.3E DRAIN COCKS
These must be located in accessible positions to facilitate draining
of the appliance and all water pipes connected to the appliance.
3.6.4E AIR RELEASE POINTS
These must be positioned at the highest points in the system where
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air is likely to be trapped. They should be used to expel trapped air
and allow complete filling of the system.
3.6.5E EXPANSION VESSEL
The appliance has an integral expansion vessel to accommodate
the increased volume of water when the system is heated. Refer to
the specification table for more detailed information.
3.6.6E FILLING POINT
A method for initial filling of the system and replacing water lost dur-
ing servicing etc. directly from the mains supply, should be provided
(see Fig. 8). This method of filling complies with the current Water
Supply (Water Fittings) Regulations 1999 and Water Bylaws 2000
(Scotland).
3.6.7E LOW PRESSURE SEALED SYSTEM
An alternative method of filling the system would be from an independ-
ent 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.
3.6.8E 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.
3.7E ELECTRICAL SUPPLY
The appliance is supplied for operation on 230V @ 50Hz electrical
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 fuse spur with a contact separation of at least 3,5 mm (3°
high-voltage category). The switch must only supply the appliance
and its corresponding controls, i.e. time clock, room thermostat, etc.
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.
3.8E MOUNTING ON A COMBUSTIBLE SURFACE
The appliance can be mounted on a wall of combustible material
without any requirement to fit any additional protective (fire-resistant)
material.
3.9E TIMBER FRAMED BUILDINGS
If the appliance is to be fitted in a timber framed building, it should
be fitted in accordance with I.S. 813 and local Building Regulations.
The Institute of Gas Engineers publication (IGE/UP/7) 'Guide for
Gas Installations in Timber Frame Buildings' gives specific advice
on this type of installation.
3.10E 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 accord-
ance 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 treatment product, must be administered in
strict accordance with the manufacturer's instructions.
If the appliance is to be installed to an existing system; water treat-
ment 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.
3.11E DECLARATION OF CONFORMITY
A Declaration of Conformity (as defined in I.S. 813) must be provided
on completion of the installation.
A copy of the declaration must be given to the responsible person
and also to the gas supplier if required.
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