Boiler Mounting Surface; Balanced Flue Terminal And Ducting; The Siting Of Balanced Flue Terminals; Position - Potterton Profile 30e Installation And Servicing Instructions

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 Surface

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

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 are 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
Supplied By www.heating spares.co Tel. 0161 620 6677
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 as shown in TABLE 1. Further
details for installation of a boiler within a compartment are
given in BS 6798.
TABLE 1
PROFILE
30e
40e
50e
60e
80e
If the openings draw air from outside the building the free
areas may be halved. Refer to BS 5440 Part 2 for further
guidance.
INFORMATION RELATING TO VERTICAL FLUING IS
PROVIDED IN THE PACK CONTAINING THE VERTI-CAL
FLUE SYSTEM.
NOTE
Where a flue terminal is fitted less than 1000mm from a
plastic or painted gutter or 500mm from painted eaves, an
aluminium shield of 1000mm 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

A. DIRECTLY BELOW AN OPENABLE
WINDOW, AIR VENT, OR ANY OTHER
VENTILATION OPENING.
B. BELOW GUTTER, DRAIN/SOIL PIPE
C. BELOW EAVES
D. BELOW A BALCOY OR CAR PORT ROOF
E. FROM VERTICAL DRAIN PIPES AND
SOIL PIPES
F. FROM INTERNAL OR EXTERNAL CORNERS
G. ABOVE ADJACENT GROUND OR BALCONY
LEVEL
H. FROM A SURFACE FACING THE TERMINAL
I. FACING TERMINALS
J. FROM OPENING (DOOR/WINDOW) IN
CARPORT INTO DWELLING
K. VETICALLY FROM A TERMINAL ON
THE SAME WALL
L. HORIZONTALLY FROM A TERMINAL ON
THE SAME WALL
M. ADJACENT TO OPENING
AIR VENT AREAS
2 2
in cm
16 103
21 135
26 170
32 206
43 277
MINIMUM DISTANCE
mm
300
25
25
25
75
25
300
600
1,200
1,200
1,500
300
150