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4.
SITING THE APPLIANCE
IMPORTANT
The appliance must not be installed in a bedroom or bed-sitting room
or in a room contaimng a bath or shower.
The appliance may be installed in any other room although 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 applicable m Scotland.
with
respect to the
installation
of Lhe appliance in a room containing a bath or shower.
1.
The appliance is floor standing. The floor must be firm and
level.
2.
Siting must allow for the proviston of an open flue termination.
See Section 5-Flue
3.
If the appliance is to be fitted in a timber frame building then
it
must be fitted in accordance with the British Gas publication
"Guide
for Gas Installations in Timber Framed Housing".
5.
FLUE
The appliance must be connected to a flue conforming to BS71 5
and incorporate a suitable adapter.
The appliance flue outlet has an mternal diameter of 144mm. The
flue pipe fitted to the boiler must have an internal diameter of
1
25
mm
(5
in.). If the outside diameter of the flue pipe is greater than
1 44 mm then an adapter must be fitted.
An acceptable means of disconnection e.g. a slip or split socket,
must be incorporated in the installation immediately above the
draught diverter.
The appliance must be connected to a flue wh1ch will provide a
consistent up-draught without undue cooling of the flue gases. The
requirements of BS 5440:1 should be followed.
Horizontal flue runs should be avoided and the flue should
terminate in accordance with the relevant recommendations given
in BS 5440:1 The flue must be fitted with a term mal which has been
tested and found satisfactory by British Gas. The terminal must not
be installed w1thm 600mm (24 in.) of an openable wmdow, air vent
Or any other ventilation opening.
F.x1sting ch1mneys may be suitable but must be swept first and
usually require an approved liner to be fitted. If in doubt regarding
the suitabillty of a flue, consult the local Gas Region for advice.
!f the flue is required to be taken through the wall behind the boiler
then adequate space should be allowed for a suitable flue bend to
be fitted Right angle bends must not be used.
When the flue is taken through a ceiling and into the roof space or
room above. it must be provided with a sleeve of non-combustible
material suff1cient to allow an a1r space between the sleeve and the
flue of 25 mm (1 in.) mm1mum. A suitable non-combustible sleeve
or plate must be fitted to centre the flue and maintain the 25 mm
6
4.
The following clearances must be left to allow for seJVicing
and ventilation:
(a)
Above the appliance,
(b) In front of the appliance,
(c)
Left·hand sideo
(Viewed from front)
(d) Right·hand sideo
(Viewed from front)
Servicing 450 mm (18 in.)
Ventilation
5
mm {0.2 in.)
Servicing 600 mm
(24
in.)
Ventilation 150 mm
(6
in.)
SetVicing 25 mm {1.0 in.)
Ventilation 5 mm
{0.2
in.)
Servicing 70 mm (2.8 in.)
Ventilation 70 mm
{2.8
in.)
If a standard work surface is
fitted then the gap should
be
1
00 mrn (4 in.)
Take care to ensure that adequate space is available at
either side to manoeuvre the appliance during installation.
This is left to the discretion of the installer.
5.
Refer to Sections 2, 3, 5, 6 and 7 for additional information.
(1
in.) air gap. The space between the plate or sleeve and the flue
pipe should be filled with mineral wool or similar non·combustible,
non conducting materials
IMPORT ANT: It is ESSENTIAL to ensure, in practice, that products
of combustion discharging from the terminal cannot re-enter the
building or any other adjacent building through ventilators,
windows, doors or other sources of natural air infiltration or
forced ventilation
or
air conditioning. If this eventuality should
occur, the appliance
MUST
be turned off immediately and the
local Gas Region called in to investigate.
6.
AIR SUPPLY
The appliance must have clearance at the right hand side for air
movement of at least 70 mm
(2.8
in.) or 100 mm (4 in.) if a work
surface has been fitted above the appliance. See Section
4.
The appliance must not be boxed in tightly with kitchen cupboards
etc. Air supply must be provided in accordance with BS 5440:2.
1.
If the appliance is installed in a room, then the room must have
a permanent air vent direct to outside air, or to an adjacent
room which itself has a permanent air vent direct to outside air.
The minimum effective area of the air vent(s) required is
1 DO
cm
2
(15 in
2 ).
2.
If the appliance is installed in a cupboard or compartment,
permanent air vents are required in the cupboard or compart·
ment, one at high level, and one at low level, either direct to
outside air or to a room. Both high and low level air vents must
commumcate with the same room or must both be on the
same wall to the outside air. The minimum effective areas are
given in Table 4. Where the cupboard or compartment is
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