Table of Contents
Advertisement
I.S. 813, Annex K.
When an appliance is installed in a room or internal space
containing 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 appliance. 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 de-
signed and constructed specifically for this purpose. An exist-
ing compartment/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. Instal-
lation 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 con-
nection 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 appli-
ance 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 carried 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 air is likely to be trapped. They should be used to expel
trapped air and allow complete filling of the system.
18
3.6.5E EXPANSION VESSEL
The appliance has an integral expansion vessel to accommo-
date 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
during servicing etc. directly from the mains supply, is provided
(see fig. Fig. 25). This method of filling complies with the cur-
rent 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
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. 11). 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 'modi-
fied' sine wave.
3.8E 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.
3.9E 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
aluminium 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 aluminium 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
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.
3.11E SHOWERS
If the appliance is intended for use with a shower, the shower
must be thermostatically controlled and be suitable for use with
a combination boiler.
3.12E 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.
Hide quick links:
Advertisement
Table of Contents
