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SECTION 3A - GENERAL REQUIREMENTS (EIRE)
This appliance must be installed by a competent person in accord-
ance with and defined by, the Standard Specification (Domestic Gas
Installations) Declaration (I.S. 813).
3A.1 RELATED DOCUMENTS
The installation of this boiler must be in accordance with the relevant
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.
3A.2 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 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.
3A.3 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.
3A.4 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.
3A.5 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.
3A.6 WATER CIRCULATION
Specific recommendations are given in I.S. 813. The following notes
are for general guidance only.
3A.6.1 PIPEWORK
It is recommended that copper tubing be used in conjunction with
soldered capillary joints. Where possible pipes should have a gradi-
ent 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.
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3A.6.2 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'.
3A.6.3 DRAIN COCKS
These must be located in accessible positions to facilitate draining
of the appliance and all water pipes connected to the appliance.
3A.6.4 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.
3A.6.5 EXPANSION VESSEL
The appliance has an integral expansion vessel to accommodate
the increased volume of water when the system is heated. It can
accept up to 8 litres of expansion from within the system, gener-
ally this is sufficient, however if the system has an unusually high
water content, it may be necessary to provide additional expansion
capacity (see 6.18).
3A.6.6 FILLING POINT
A method for initial filling of the system and replacing water lost
during servicing etc. is provided. You should ensure this method of
filling complies with the local water authority regulations.
3A.6.7 LOW PRESSURE SEALED SYSTEM
An alternative method of filling the system would be from an inde-
pendent 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. 5). The cold feed from the make-up ves-
sel 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.
3A6.8 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 pres-
sures up to at least 3 bar.
3A.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 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.
3A.8 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.
3A.9 INHIBITORS
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 instruc-
tions*. *Water treatment of the complete heating system - including
the boiler - should be carried out in accordance with I.S. 813 and the
Domestic Water Treatment Association's (DWTA) code of practice.
3A.10 SHOWERS
If the appliance is intended for use with a shower, the shower must
be thermostatically controlled and be suitable for use with a com-
bination boiler.
3A.11 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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