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SECTION 3 - GENERAL REQUIREMENTS (UK)
This appliance must be installed by a competent person in accord-
ance with the Gas Safety (Installation & Use) Regulations.
3.1 RELATED DOCUMENTS
The installation of this boiler must be in accordance with the relevant
requirements of the Gas Safety (Installation & Use) Regulations,
the local building regulations, the current I.E.E. wiring regulations,
the bylaws of the local water undertaking, the Building Standards
(Scotland) Regulation and Building Standards (Northern Ireland)
Regulations.
It should be in accordance also with any relevant requirements of
the local authority and the relevant recommendations of the following
British Standard Codes of Practice.
3.2 LOCATION OF APPLIANCE
The appliance may be installed in any room or internal space, al-
though particular attention is drawn to the requirements of the current
I.E.E. wiring regulations, and in Scotland, the electrical provisions
of the Building Regulations, with respect to the installation of the
appliance in a room or internal space containing a bath or shower.
When an appliance is installed in a room or internal space contain-
BS 5440
PART 1
BS 5440
PART 2
BS 5449
PART 1
BS 5546
BS 6798
BS 6891
BS 7074
PART 1
ing 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, BS 6798 gives detailed guidance on
this aspect. A compartment used to enclose the appliance must be
designed and constructed specifically for this purpose. An existing
compartment/cupboard may be utilised provided that it is modified to
suit. Details of essential features of compartment/cupboard design
including airing cupboard installations are given in BS 6798. This
appliance is not suitable for external installation.
3.3 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 BS 6891.
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 BS6891.
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.
3.4 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 fig. 4). 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 BS
8
5440 Part 1, when the terminal is 0.5 metres (or less) below plastic
guttering or 1 metre (or less) below painted eaves.
3.5 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 pur-
poses is also not required.
3.6 WATER CIRCULATION
Detailed recommendations are given in BS 5449 Part 1 and BS
6798. The following notes are for general guidance only.
3.6.1 PIPEWORK
It is recommended that copper tubing to BS 2871 Part 1 is 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
FLUES
FLUES & VENTILATION
FORCED CIRCULATION HOT WATER SYSTEMS
INSTALLATION OF GAS HOT WATER SUPPLIES FOR DOMESTIC PURPOSES
INSTALLATION OF BOILERS OF RATED INPUT NOT EXCEEDING 60kW
LOW PRESSURE INSTALLATION PIPES
APPLICATION, SELECTION, AND INSTALLTION OF EXPANSION VESSELS
AND ANCILLARY EQUIPMENT FOR SEALED WATER SYSTEMS
and in particular to avoid the possibility of freezing. Particular atten-
tion should be paid to pipes passing through ventilated areas such
as under floors, loft space and void areas.
3.6.2 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'.
3.6.3 DRAIN COCKS
These must be located in accessible positions to facilitate draining
of the appliance and all water pipes connected to the appliance. The
drain cocks must be manufactured in accordance with BS 2879.
3.6.4 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.
3.6.5 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).
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 provided.
This method of filling complies with the current Water Supply (Water
Fittings) Regulations 1999 and Water Bylaws 2000 (Scotland). If an
alternative location is preferred, it should be connected as detailed.
3.6.7 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 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.
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