Glow-worm Hideaway 40CF - Manual (Page 8)

8 221807B
Important Note
The boiler is fitted with a Flue Blockage Safety Device, which
will shut down the boiler if there is an unacceptable spillage of
products at the draught diverter.
This safety device MUST NOT under any circumstances be
interferred with or put out of action. The safety device must only
be replaced with the Glow-worm parts.
3.1 Flue
The integral draught diverter on the Hideaway range of boilers
makes the combustion performance independent of conditions
in the secondary flue, but in common with other fuels an efficient
flue is necessary to make sure of a trouble free installation.
The flue must be at least equivalent to 1m vertical.
The boiler flue socket is designed to take flue pipes to the
current issue of BS567. If a flue pipe to BS715 is to be used, an
adapter must be fitted to the boiler flue socket, as diagram 1.1.
The flue must be in accordance with the current issue of
BS5440 Part 1.
3.2 Flue Guidelines
The flue should be kept as short as possible. Horizontal or very
shallow runs of the flue should be avoided as they encourage
local cooling.
Always choose a flue route which will cause the least cooling of
the flue.
There should be a vertical rise of at least 600mm (2ft) before
using a bend. 90
o elbows should not be used.
End with a certificated flue terminal, preferably above ridge
height, but at least above the eaves of a pitched roof.
An existing chimney must be thoroughly swept and all debris
cleared away before lining.
3.3 Timber Frame Buildings
If the boiler is to be installed in a timber frame building it should
be fitted in accordance with the Institute of Gas Engineers
document IGE/UP/7/1998. If in doubt seek advice from the local
gas undertaking or Hepworth Heating Ltd.
3.4 Ventilation for Boiler Installed in a Room
or Space
If the boiler is to be installed in a room or space a purpose
designed permanent ventilation opening, to supply air for
combustion, must be provided on an outside wall to external air,
refer to the current issue of BS5440 Part 2 for details.
The opening may be directly into the room or the space
containing the boiler, or an outside wall of an adjacent room or
space which has an internal permanent air vent, of the same
size, into the room or space containing the boiler.
Do not ventilate through a bedroom, bedsitting room, private
garage or a room containing a bath or shower.
When the boiler is installed in a room or internal space already
containing other fuel burning appliances then the air supply of
such appliances must be taken into account.
The ventilation opening areas are given in “Air Vent Table A”.
The figures quoted refer to the minimum acceptable effective
area.
3 Flue and Ventilation
3.5 Ventilation for Boilers Installed in a
Cupboard or Compartment
When the boiler is fitted in a cupboard or compartment, high and
low level purpose designed, permanent openings must be
provided to supply air for combustion and compartment
ventilation.
The air vents must have minimum areas in accordance with
“Compartment Air Vent B”. The figures quoted refer to the
minimum acceptable effective area.
Both the high and low level openings must communicate with
the same room, or must both be on the same wall to outside air.
If air vent grilles are fitted to a cavity wall, the opening through
the wall must be ducted.
Where ventilation air to a compartment is taken from a room or
space, then the room or space must be fitted with a ventilation
opening as specified in “Air Vent Table A”.
For information regarding compartment requirements refer to
the appropriate section of the current issue of BS6798.
3.6 Extract Fans
If an extract fan is fitted in the premises, there is a possibility that
if adequate inlet openings are not provided, spillage of the
products from the boiler could occur.
When openings are fitted in accordance with the current issue
of BS5440 Part 2 and this section, extract fans should not cause
down draught, but where such fan installations are found, a
spillage test must be carried out in accordance with the current
issue of BS5440 Part 1 and any corrective work done.
FROM
OUTSIDE
COMPARTMENT AIR VENT TABLE 'B'
COMPARTMENT
VENTILATION
REQUIREMENTS
136cm 2 22in 2 272cm 2 43in 2
68cm 2 11in 2 136cm 2 22in 2
VENTILATION
FROM ROOM
OR SPACE
HIGH LEVEL LOW LEVEL
VENT AREA VENT AREA
AIR VENT TABLE 'A' FOR
ROOM/SPACE INSTALLATIONS
EFFECTIVE
AREA OF VENT cm 2
in 2
37
5.4