Meters; Flue System; Installation Pipes - Vaillant VCW 2O Instructions For Installation And Servicing

3.3.2 Meters
A gas meter is connected to the service pipe by
the local gas region or a local gas region
contractor.
An existing meter should be checked to ensure
that it is capable of passing an additional
2.95 ms/h (106 CFH) before the VCW 20
(or 3.38 mslh (122 CFH) before the VCW 25 or
2.47 melh (89 CFH) before the VCW-sine 18) is
installed.
3.3.3 lnstallation pipes
Installation pipes should be fitted in accordance
with CP 331 :3.
Pipework from the meter to the combi boiler
must be of a adequate size. Do not use pipes of
a smaller size than the combi boiler gas
connection.
The complete installation must be tested for
soundness as described in the above Code.
3.4 Flue system
Detailed recommendations for fluing are given
in BS 5440 : 1. Thefollowing notes are intended
to give general guidance.
\=i= 3.4.1 VCW-sine (B.F. Appliance)
The boiler must be installed so that the flue
terminal is exposed to the external air.
Termination should be on a clear expanse of
wall;
the terminal being preferably not less than
600 mm (2 ft.) awayfrom acorner, a recessora
projecilon.
Do not install the terminal:
a) Within 300 mm (1 ft.) measured vertically
from the bottom of an openable window, air
vent, or any other ventilation opening.
b) Within 300 mm (1 ft.) above adjacent
ground level.
c) Within 600 mm (2 ft.) of any surface facing
the terminal.
d) lmmediately beneath eaves or a balcony.
Where the lowest part of the termlnal is less
than 2 m (6,6 ft.) above the level of any ground,
balcony, flat roof or place to which people have
access, the terminal must by protected by a
guard of durable material. A terminal protective
guard is available as an optional extra with the
combi boiler. The air inleVproducts outlet duct
and the terminal of the boiler must not be closer
than 50 mm (2 in.) to combustible material.
Detailed recommendations on Drotection of
combustible material are given in BS 5440 : 1.
3.4.2 VCW (O.F. Appliance)
Detailed recommendations for fluing are given
in BS 5440 : 1 . The following notes are intended
to give general guidance.
The cross sectional area of the flue fitted to the
combi boiler must be not less than the area of
the flue outlet of the appliance. An adapter is
supplied to allow the fitting of 125 mm steel flue
pipe or 125 mm light asbestos cement flue pipe.
When fitting
flue pipes a split socket
connector must be fitted to ensure easy
disconnection of the flue pipe (see page 13
f i g . 1 6 ) .
Flue pipes and fittings should be constructed
from one of the following materials:
a) Asbestos cement,
b) Aluminium or stainless steel,
c) Cast-iron acid-resistant vitreous enamel
lined.
lf double-walled flue pipe is used it should be of
a type acceptable to British Gas.
lf a chimney is used it preferably should be one
that is composed of or lined with a nonporous
acid-resistant material. (Chimneys lined
with salt-glazed earthenware pipes are
acceptable if the pipes comply with BS 65 and
540 : 1 .) A flue pipe constructed from one of the
materials in a) to c) above should form the initial
connection to lined chimneys. Where a
chimney is to be used which is not composed of
or lined with a non-porous acid-resistant
material it should be lined with a stainless steel
flexible flue liner or any other liner that is of a
type acceptable to British Gas. The internal dia-
meter of the liner must not be less than shown
in the technical data and the number of joints
mustbe kepttoaminimum. lf thefluelinerisnot
to be connected directly to the combi boiler
draught diveder a
flue pipe which is
constructed from one of the materials in a) to c)
above should form the connection between the
draught diverter and flue liner.
Before connecting the combi boiler to, or
inserting a liner into, a flue that has been
previously used, the flue must be thoroughly
swept clean of any soot and loose material. lf a
register plate, restrictor plate, damper etc. is
fitted in the flue, it must be removed before
connecting the combi boiler to, or inserting a
liner into, the flue.
The flue should terminate in accordance with
the relevant recommendations given in BS
5440:1, table 4.
A terminal of a type that has been tested and
found satisfactory by British Gas should be
fitted at the flue outlet.
The point of termination must not be within
600 mm (2 ft.) of an openable window, air vent
or any other ventilation opening.
c