Cranborne THI 10-50c, Installation, Commissioning And Servicing Instructions

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IV - INSTALLATION
1 - GENERAL
Installing a wall-mounted gas boiler presents no par-
ticular difficulty.
The installation of the boiler must be carried out by
a competent person in accordance with the relevant
requirements of the Gas Safety (Installation and
Use) Regulations, Building Regulations, Model Wa-
ter Byelaws and the Building Standards (Scotland)
Regulations. It must also comply with the current
I.E.E. Wiring Regulations and the relevant recom-
mendations of the following British Standard Codes.
Regulations and the relevant recommendations of
the following British Standard Codes of Practice.
CR331.3 Low pressure installation pipes.
BS.5449.1 Forced circulation hot water systems.
BS.5546 Installation of gas hot water supplies
for domestic purposes.
BS.5440.1 Flues (for gas appliances of rated input
not exceeding 60 kW).
BS.5440.2 Air supply (for gas appliances of rated
input not exceeding 60 kW).
BS.6798 Boilers of rated input not exceeding
60 kW.
Note:
- The boiler is only suitable for installation in a sea-
led system and must not be used with an open
vented system.
LOCATION OF BOILER
The boiler can be installed on the inner face of an
external wall - and some internal walls - providing
they are flat, vertical and capable of adequately sup-
porting the weight of the boiler and any ancillary
equipment.
The boiler may be installed in any room or internal
space, although particular attention is drawn to the
requirements of the current I.E.E. Wiring Regula-
tions and, in Scotland, the electrical provisions of
the Building Regulations applicable in Scotland with
respect to the installation of the boiler in a room or
internal space containing a bath or shower. Where
installation is in a room containing a bath or shower,
any electrical switch or boiler control utilising mains
electricity should be situated so that it cannot be tou-
ched by a person using the bath or shower.
Where installation will be in an unusual location,
special procedures may be necessary and BS.6798
gives detailed guidance on this subject.
A compartment used to enclose the boiler MUST be
designed and constructed specially for this purpose.
An existing cupboard or compartment may be used
provided it is modified for the purpose. Details of es-
sentiel features of cupboard/compartment design,
including airing cupboard installations, are given in
BS.6798.
In siting the boiler, the following limitations MUST be
observed:
1) The position selected for installation MUST allow ade-
quate space for servicing in front of the boiler and for
air circulation around the boiler.
2) This position MUST also permit the provision of a sa-
tisfactory balanced flue termination.
Note:
- If the boiler is to be fitted in a timber framed buil-
ding, it should be Jitted in accordance with the
British Gas publication "Guide for Gas Installa-
tions in Timber Frame Housing". Reference DM2.
If in doubt, advice must be soughtfrom the Local
Gas Region of British Gas.
When siting the boiler, provision must be made for
the disposal of the condensate, see Section 4 -Con-
densate drain.
The pressure relief valve connection should be rou-
ted to an external, visible point where the discharge
of steam or water cannot create a hazard to persons
or property. BS.5449: 1 refers.
GAS SUPPLY
Installation pipes should be fitted in accordance with
CP.331.3.
The complete installation must be tested for sound-
ness and purged in accordance with CR331.3.
FLUEING
Detailed recommendations for flueing are given in
BS.5440.1. The following notes are intended for ge-
neral guidance.
AIR SUPPLY
a) - For room-sealed systems
Detailed recommendations for air supply are given
in BS.5440.2. The following notes are intended for
general guidance.
Where the boiler is to be installed in a room or inter-
nal space, the boiler does not require the room or in-
ternal space containing it to have a permanent air
vent.
Where the boiler is to be installed in a cupboard or
compartment, permanent high and low level air
vents are required for cooling purposes in the cup-
board or compartment. Both vents must communi-