Supplied By www.heating spares.co Tel. 0161 620 6677
5
Site Requirements - Page 5
Where the installation of the boiler will be in an unusual
location, special procedures may be necessary and BS
6798 gives detailed guidance on this aspect.
Ensure that the gas supply pipe and meter are large
enough for this appliance and any others that may be run
off the same meter. Reference should be made to
B56891.
Boiler Mounting Surfaces
The boiler must be mounted on a flat wall, which may be of
combustible material and must be sufficiently robust to take
the weight of the boiler. The requirements of the local
authorities and the building Regulations must be adhered
to.
IMPORTANT NOTICE:
TIMBER FRAMED HOUSES
If the appliance is to be fitted in a timber framed building, it
should be fitted in accordance with British Gas Publication
‘Operational Procedures for Customer Service’ Part 19. If
in any doubt, advice should be sought from the local region
of British Gas.
Clearances Around the Boiler
The following minimum clearances must be maintained
after installation, for correct operation and servicing of the
boiler:
610mm (2 ft) at the front of the boiler
5mm (0.2 in) each side of the boiler
50mm (2 in) at the top (measured from the top of the boiler
case), except where the optional extra pump cover is to be
fitted, when 178mm (7 in) should be allowed.
100mm (4 in) at the bottom of the boiler.
Additional clearances to these are required during
installation for lifting the boiler and 127mm (5 in) is required
at the top of the boiler for access to the pipe connections.
Ventilation
If the boiler is to be installed in a confined space such as a
cupboard, the space will need ventilating. Openings must be
provided at the top and bottom of the cupboard each of
which should have a free area of 349 cm
2
, (54 in
2
). Further
details for installation of a boiler within a compartment are
giving in BS 6798.
If the openings draw air from outside the building the free
areas may be halved. Refer to BS 54401 Part 2 for further
guidance.
Balanced Flue Terminal and Ducting
The fresh air inlet and flue ducts can be run from either the
left, right, rear or top of the boiler to a miniature terminal on
the outside of the building.
The minimum spacings from the terminal to obstructions
and ventilation openings as shown in FIG. 3.. For
information appertaining to horizontal flue lengths
reference should be made to FIG. 4.
If a terminal is fitted less than 2m above a balcony, above
ground or above a flat roof to which people have access
then a suitable terminal guard should be fitted (P.l.L No.
205792).
Refer to B55440 Part 1 for further guidance.
Fig. 3
THE SITING OF BALANCED
FLUE TERMINALS
INFORMATION RELATING TO VERTICAL FLUING IS
PROVIDED WITH THE VERTICAL FLUE SYSTEM
PACK.
NOTE
Where a flue terminal is fitted less than 1000 from a plastic
or painted gutter or 500mm from painted eaves, an
aluminium sheild of 1000 length should be fitted to
underside of gutter or eaves.
Any car port or other add-on extension should consist of a
roof or a roof and one other wall. If it consists of a roof and
two other walls — the installation shall be treated as suspect
and further advice sought.
POSITION
MINIMUM DISTANCE
mm
A.
DIRECTLY BELOW AN OPENABLE
WINDOW, AIR VENT, OR ANY OTHER
VENTILATION OPENING.
300
B.
BELOW GUTTER, DRAIN/SOIL PIPE
75
C.
BELOW EAVES
200
D.
BELOW A BALCONY OR CAR PORT ROOF
200
E.
FROM VERTICAL DRAIN PIPES AND
SOIL PIPE
75
F.
FROM INTERNAL OR EXTERNAL CORNERS
300
G.
ABOVE ADJACENT GROUND OR BALCONY
LEVEL
300
H.
FROM A SURFACE FACING THE TERMINAL
600
I.
FACING TERMINALS
1,200
J.
FROM OPENING (DOOR/WINDOW) IN
CARPOT INTO DWELLING
1,200
K.
VERTICALLY FROM A TERMINAL ON
THE SAME WALL
1,500
L
HORIZONTALLY FROM A TERMINAL ON
THE SAME WALL
300
M.
ADJACENT TO OPENING
150
