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4. SECTION - GENERAL REQUIREMENTS (UK)
BS 5440
PART 1
FLUES
BS 5440
PART 2
FLUES & VENTILATION
BS EN 12828
DESIGN FOR WATER-BASED HEATING SYSTEMS
BS 6798
INSTALLATION OF BOILERS OF RATED INPUT NOT EXCEEDING 70kW
BS 6891
LOW PRESSURE INSTALLATION PIPES
This appliance must be installed by a competent person in
accordance with the Gas Safety (Installation & Use) Regulations.
4.1 RELATED DOCUMENTS
The installation of this boiler must be in accordance with the
relevant requirements of the Gas Safety (Installation & Use)
Regulations, the local building regulations, the current I.E.E.
wiring regulations, the bylaws of the local water undertaking, the
Building Standards (Scotland) Regulation, and Building Standards
(Northern Ireland) Regulations. It should be in accordance also
with any relevant requirements of the local authority and the
relevant recommendations of the following British Standard
Codes of Practice.
ATTENTION
The use of PPE (Personal Protective Equipment) such as but not
limited to gloves, mask, safety glasses, etc. is strongly recom-
mended whenever carrying out the installation, repair, or mainte-
nance of this appliance – please pay particular attention to:
• Sharp edges that may be encountered when:- handling or
lifting the appliance, removing parts, etc. during installation
and maintenance
• Airborne particles that may be released and/or disturbed when
cleaning or removing components during maintenance
• Water treatment chemicals that could have been added to
the system water may spill from the appliance and or com-
ponents during maintenance
Please refer to an appropriate Health and Safety document
such as HSE L23 (UK) or S.I. 299 (Ireland), for more detailed
advice on safe working practices and procedures.
4.2 LOCATION OF APPLIANCE
The appliance may be installed in any room or internal space,
although particular attention is drawn to the requirements
of the current I.E.E. wiring regulations, and in Scotland, the
electrical provisions of the Building Regulations, with respect
to the installation of the appliance in a room or internal space
containing a bath or shower. When an appliance is installed
in a room or internal space containing a bath or shower, the
appliance or any control pertaining to it must not be within
reach of a person using the bath or shower (refer to IEE regs).
The location chosen for the appliance must permit the
provision of a safe and satisfactory flue and termination.
The location must also permit an adequate air supply for
combustion purposes and an adequate space for servicing
and air circulation around the appliance. Where the
installation of the appliance will be in an unusual location
special procedures may be necessary, BS 6798 gives detailed
guidance on this aspect. A compartment used to enclose the
appliance must be designed and constructed specifically for
this purpose. An existing compartment/cupboard may be
utilised provided that it is modified to suit
. Details of essential
features of compartment/cupboard design including airing
cupboard installations are given in BS 6798. This appliance is
not configured for external installation applications
.
4.3 GAS SUPPLY
The gas meter – as supplied by the gas supplier – must be checked
to ensure that it is of adequate size to deal with the maximum rated
input of all the appliances that it serves. Installation pipes must
be fitted in accordance with BS 6891
. Pipe work from the meter
to the appliance must be of adequate size. Pipes of a smaller
size than the appliance gas inlet connection must not be used.
The installation must be tested for soundness in accordance with
BS6891.
If the gas supply serves more than one appliance, it
must be ensured that an adequate supply is maintained to each
appliance when they are in use at the same time.
NOTE:
It is recognised that ‘pressure loss’ through the gas cock
and gas valve may result in a pressure drop of approximately
2mbar between the gas meter and gas valve inlet test point; this
will not impair the performance of the appliance, provided that a
dynamic pressure of 18mbar is available at the appliance inlet.
4.4 FLUE SYSTEM
The terminal should be located where the dispersal of combustion
products is not impeded and with due regard for the damage
and discoloration that may occur to building products located
nearby. The terminal must not be located in a place where it
is likely to cause a nuisance (see fig. 5
). In cold and/or humid
weather, water vapour will condense on leaving the terminal;
the effect of such pluming must be considered
.
If installed less than 2m above a pavement or platform to which
people have access (including balconies or flat roofs) the terminal
must be protected by a guard of durable material. The guard
must be fitted centrally over the terminal. Refer to BS 5440
Part 1, when the terminal is 0.5 metres (or less) below plastic
guttering or 1 metre (or less) below painted eaves.
4.5 AIR SUPPLY
The following notes are intended for general guidance only. This
appliance is a room-sealed, fan-flued boiler, consequently it
does not require a permanent air vent for combustion air supply.
When installed in a cupboard or compartment, ventilation for
cooling purposes is also not required.
4.6 WATER CIRCULATION
Detailed recommendations are given in BS EN 12828 and BS
6798. The following notes are for general guidance only.
4.6.1 PIPEWORK
It is recommended that copper tubing to BS 2871 Part 1 is used
in conjunction with soldered capillary joints. Where possible
pipes should have a gradient to ensure air is carried naturally to
air release points and that water flows naturally to drain cocks
.
Except where providing useful heat, pipes should be insulated to
avoid heat loss and in particular to avoid the possibility of freezing.
Particular attention should be paid to pipes passing through
ventilated areas such as under floors, loft space, and void areas
.
4.6.2 AUTOMATIC BY-PASS
The appliance has a built-in automatic by-pass, consequently there
is no requirement for an external by-pass, however the design
of the system should be such that it prevents boiler ‘cycling’.
4.6.3 DRAIN COCKS
These must be located in accessible positions to facilitate draining
of the appliance and all water pipes connected to the appliance. The
drain cocks must be manufactured in accordance with BS 2879.
4.6.4 AIR RELEASE POINTS
These must be positioned at the highest points in the system
where air is likely to be trapped. They should be used to expel
trapped air and allow complete filling of the system
.
4.6.5 EXPANSION VESSEL
The appliance has an integral expansion vessel to accommodate
the increased volume of water when the system is heated.
Refer to the specification table for more detailed information
.
4.6.6 FILLING POINT
A method for initial filling of the system and replacing water lost
during servicing etc. directly from the mains supply, should be
provided (see fig. 6
).
This method of filling complies with the
current Water Supply (Water Fittings) Regulations 1999 and
Water Bylaws 2000 (Scotland).
4.6.7 LOW PRESSURE SEALED SYSTEM
An alternative method of filling the system would be from an
independent make-up vessel or tank mounted in a position at
least 1 metre above the highest point in the system and at least
5 metres above the boiler (see fig. 7
).
The cold feed from the make-up vessel or tank must be fitted
with an approved non-return valve and stopcock for isolation
purposes. The feed pipe should be connected to the return pipe
as close to the boiler as possible.
