GENERAL
6
Mexico Slimline CF440 -
Installation & Servicing
In cases of repeated or continuous shutdown a competent
person should be called to investigate and rectify the condition
causing this and carry out an operational test after each
intervention on the device. Only the manufacturer's original parts
should be used for replacement.
AIR SUPPLY
Detailed recommendations for air supply are given in
BS.5440:2. In IE refer to I.S. 813:2002.
The following notes are for general guidance:
1.
The room or internal space in which the boiler is installed
MUST have, or be provided with, a permanent air vent. This
vent MUST be either direct to outside air or to an adjacent
room or internal space which must itself have, or be provided
with, a permanent air vent at least the same size direct to
outside air.
The minimum effective area of the permanent air vent(s) are
specified in Table 3 and are related to maximum rated heat
input of the boiler.
The air vent(s) must NOT have provision for closing or
adjustment and should be sited to avoid risk of accidental
damage or blockage.
If other methods of ventilation are envisaged, British Gas
should be consulted before proceeding.
2.
If the boiler is to be installed in a cupboard or compartment,
permanent air vents are required (for combustion, flue
dilution and cooling purposes) in the cupboard /
compartment, at both high and low levels to ensure safe and
efficient combustion and ventilation.
The air vents may either communicate with room/internal
space (appropriately ventilated) or be direct to outside air.
The minimum effective areas of the permanent air vents,
required in the cupboard / compartment, are specified in
Table 4 and are related to maximum rated heat input of the
boiler.
Notes.
a.
Both air vents MUST communicate with the same room or
internal space or MUST be on the same wall to outside air.
b.
In siting the air vents care must be taken to avoid the freezing
of pipework.
c.
Where cupboard / compartment air vents are open to a room
or internal space, the room or internal space MUST itself be
provided with a permanent air vent, as previously specified.
d.
The cupboard / compartment air vents must NOT communicate
with a bedroom, bed-sitting room or a room containing a bath
or shower.
FLUE INSTALLATION
The flue must be installed in accordance with the
recommendations of BS. 5440-1:2000. In IE refer to I.S. 813:2002.
The following notes are intended for general guidance:
1.
The cross-sectional area of the flue, serving the boiler, MUST
NOT be less than the area of the flue outlet of the boiler.
If flue pipe is to be used it MUST NOT be less than the diameter
of the flue outlet connection on the boiler.
2.
Flue pipes and fittings should be constructed from one of the
following materials:
a.
Aluminium or stainless steel.
b.
Cast iron, coated on the inside with acid resistant vitreous
enamel.
c.
Other approved material.
3.
If twin walled flue pipe is used it should be of a type
acceptable to British Gas.
4.
If a chimney is to be used it should preferably be one that is
composed of, or lined with, a non-porous acid resistant
material.
Notes.
Chimneys lined with salt -glazed earthenware pipes are
acceptable if the pipes comply with BS.65 and BS.5440-
1:2000.
A flue pipe constructed from one of the materials listed in
2 a-c should form the initial connection to the lined chimneys.
Where a chimney is to be used that is
not
composed of, or
lined with, a non-porous, acid resistant material it should be
lined with a stainless steel flexible flue liner which complies
with BS.715.
5.
Before connecting the boiler to, or inserting a liner into, a flue
that has been previously used then the flue MUST be
thoroughly swept clean of any soot or loose material. If a
register plate, restrictor plate or damper etc., is fitted in the
flue then it MUST be removed before connecting the boiler to,
or inserting a liner into, the flue.
6.
The flue should terminate in accordance with the relevant
recommendations given in BS.5440-1:2000. In IE refer to
I.S.813:2002.
7.
The flue MUST be fitted with a terminal (or ridge tile up to 5"
flue diameter). The terminal shall be of a type which has
been tested and found satisfactory by British Gas. This
terminal must NOT be installed within 600mm (24") of an
opening window, air vent or any other ventilation opening.
8.
The chimney / flue lining MUST be sealed at both the top and
the bottom.
IMPORTANT.
It is absolutely ESSENTIAL to ensure, in practice,
that the flue discharge is in a downdraught- free zone and that
products of combustion discharging from the terminal cannot re-
enter the building or any other adjacent building through
ventilators, windows, doors, other sources of natural air
infiltration or forced ventilation / air conditioning systems.
TTB DOWNDRAUGHT THERMOSTAT
This appliance is fitted with a TTB downdraught thermostat for
added safety and protection. If this thermostat should operate
and switch off the appliance it is because the flue is subject to
downdraught, probably as a result of adverse wind conditions .
The TTB is an automatic reset thermostat which will reset once
the wind conditions have returned to normal, subject to a built-in
reset delay in excess of 10 minutes
The TTB is an important safety device and must not be put out of
action or interfered with in any way.
This device is not a substitute for an independently mounted
carbon monoxide detector.
EFFECT OF AN EXTRACTOR FAN
If there is any type of extractor fan fitted in the premises there is a
possibility that, if an adequate air inlet area from outside is not
provided, spillage of the boiler flue products could occur when
the fan is in operation. Where such installations occur a spillage
test, as detailed in BS.5440:1 MUST be carried out and any
necessary action taken.
Table 3 - Air Supply
CF440
Air from room
Air from outside
High Level Low Level
High Level Low Level
cm
2
140
280
70
140
in
2
22
44
11
22
Table 4 - High and low vent areas
CF440
cm
2
in
2
Effective area
38
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200946-1.p65
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