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SECTION 4 GENERAL REQUIREMENTS
4.0 General Requirements
This appliance must be installed by a compe-
tentpersoninaccordancewiththeGasSafety
(Installation & Use) Regulations 1998.
4.1 Related Documents
The installation of this boiler must be in ac-
cordance with the relevant requirements of
the Gas Safety (Installation & Use) Regula-
tions1998theLocalBuildingRegulations,the
currentl.E.E. Wiring Regulations, the by-laws
of the local water undertaking, and in Scot-
land, in accordance with the Building Stand-
ards (Scotland) Regulation. In Ireland the lo-
cal building regulations (IE).
It should be in accordance also with any rel-
evant requirements of the local authority and
the relevant recommendations of the follow-
ing British Standard Codes of Practice:
4.2 Location of Appliance
Thecombinationboilermaybeinstalledinany
room or internal space, although particular
attention is drawn to the requirements of the
currentl.E.E.WiringRegulations,andinScot-
land, the electrical provisions of the Building
Regulations applicable in Scotland, with re-
spect to the installation of the combination
boilerina room or internal space containing a
bath or shower.
Wherea room-sealedappliance isinstalled in
a room containing a bath or shower, any
electrical switch or appliance control, utilising
mains electricity, should be located in such a
position that it cannot be touched by a person
using the bath or shower.
Thelocationchosen forthe boilermustpermit
the provision of a satisfactory flue and termi-
nation. The location must also permit an ad-
equate air supply for combustion purposes
and an adequate space for servicing and air
circulation around the boiler.
Wheretheinstallationoftheboilerwillbeinan
unusual location special procedures may be
necessary and BS 6798:1987 gives detailed
guidance on this aspect.
Pipeworkfrom the meter to the boiler must be
of adequate size. Pipes of a smaller size than
theboilerinletconnectionshouldnotbeused.
The complete installation must be tested for
soundness as described in the above code.
N.B. If the gas supply for the boiler serves
other appliances ensure that an adequate
supply is available both to the boiler and the
other appliance when they are in use at the
same time.
4.4 Flue System
The terminal should be located where disper-
salofcombustionproductsisnotimpededand
with due regard for the damage or discolora-
tionthatmightoccurtobuildingproductsinthe
vicinity (see fig 4).
The terminal must not be located in a place
where it is likely to cause a nuisance.
In cold and/or humid weather water vapour
may condense on leaving the flue terminal.
The effect of such ‘steaming’ must be consid-
ered.
A compartment used to enclose the boiler
must be designed and constructed specifi-
callyfor this purpose.An existing cupboardor
compartment may be used provided that it is
modified for this purpose.
Detailsofessentialfeaturesofcupboard/com-
partment design including airing cupboard in-
stallations are given in BS 6798:1987. This
appliance is not suitable for external installa-
tion.
4.3 Gas Supply
A gas meter is connected to the service pipe
by the gas supplier.
An existing meter should be checked, prefer-
ably by the gas supplier, to ensure that the
meter is adequate to deal with the rate of gas
supply required for all appliances it serves.
Installation pipes should be fitted in accord-
ance with BS 6891:1988.
BS 6891 1988 Low pressure installation pipes
BS 6798 1987 Boilers of rated input not exceeding 60kW.
BS 5449 Part 1 1990 Forced circulation hot water systems
BS 5546 1990 Installation of gas hot water supplies
for domestic purposes (2nd family gases).
BS 5440 Part 1 1990 Flues.
BS 5440 Part 2 1989 Flues & Ventilation.
BS 7074 Part 1 1989 Application, selection & installation of expansion
vessels & ancillary equipment for sealed water
systems.
