12.2 The replacement or servicing of components
must be carried out by a competent person, using
the
Kwikot Technical Information and Installers
Instructions
, or by the Certificate holder under their
responsibility as the product manufacturer,
including that required by their warranty, using
components supplied by the Certificate holder.
12.3 The system may be drained using the drain
valve.
12.4 When the system is used in buildings subject
to the Health and Safety at Work etc Act 1974,
an inspection of the system must be carried out
every six months.
13 Site checks
On site the following should be checked:
By the Client
(1) The installer is a competent person — by
reference to his/her identity card.
(2) The system being installed is BBA Certificated
— by reference to the label.
(3) That the installation complies with the BBA
Certificate — by reference to the installer’s
signature on the label attached to the cylinder.
By the Building Control Officer or Approved
Inspector
(1) 1, 2 and 3 as above.
(2) The combined temperature and pressure relief
valve, thermostats, non-self-resetting thermal cut-outs,
motorised valve and the immersion heater are as
described in the Certificate.
(3) The tundish and discharge pipework are
correctly located and fitted.
14 Durability
The system is manufactured from durable materials
and conventional plumbing components and will
have a life equal to that expected of a vented
system. It may be necessary to replace some of the
system components, eg the immersion heater,
thermostat, (see section 12.2 and Detail Sheet 2).
Installation
15 The installer
15.1 It is essential, for reasons of safety and
performance, that the installation, commissioning
and maintenance of the system is carried out by a
person with suitable training and practical
experience. However, the assessment of training
arrangements and continuing competence of
installers falls outside the scope of this Certificate.
15.2 It is the view of the Department of the
Environment, and stated in its Approved
Document G3, that, to meet the requirements
of the Building Regulations (England and Wales)
concerned with unvented hot water storage
systems, installations should be undertaken by a
competent person
, defined as ‘one holding a
current Registered Operative Identity Card for the
installation of unvented domestic hot water storage
systems, issued by the Construction Industry
Training Board (CITB), the Institute of Plumbing, the
Association of Installers of Unvented Hot Water
Systems (Scotland and Northern Ireland), or an
equivalent body’.
15.3 In Scotland, it is the requirement of the
deemed-to-satisfy provision to Technical
Standard P3.1
Unvented Hot Water Storage
System
for compliance with Regulation 28 of the
Building Standards (Scotland) Regulations that such
systems be ‘in the form of a proprietary unit or
package which is: (i) the subject of a BBA
Certificate; or (ii) Kitemarked to BS 7206 : 1990’.
The Standard contains no specific requirements for
installers but the Certificates referred to state that
installation must be undertaken
by a competent
person, as defined in section 15.2.
15.4 In Northern Ireland, it is the
requirement of Regulation P5
Unvented Hot
Water Storage Systems
that systems with a
capacity not greater than 500 litres, and a heat
input not greater than 45 kW, be certified as
meeting the relevant requirements of Regulation P5
by a member body of EOTA operating a Technical
Approvals Scheme, eg by the BBA under MOAT
No 38 : 1986. Agrément Certificates will refer to
a need for installation by a
competent person
, as
defined in section 15.2.
16 Conditions
The following conditions abstracted from the
Certificate holder’s instructions must be observed:
(1) The system is for connection to oil, electric or
gas fired boilers.
(2) The system must be connected to a water
supply with a pressure not exceeding 12 bar and
of a quality supplied by a water undertaker under
the Water Byelaws and Water Regulations, as
appropriate.
(3) The combined temperature and pressure relief
valve tundish must be in a clearly visible position
within 500 mm of the cylinder and in the same
compartment as the cylinder. The discharge pipe to
and from the tundish must be of metal and laid to
fall. It must terminate at a visible safe place, such
as a gully, where there is no risk of contact with the
hot water by persons in or about the building.
Further details are given in BBA Information
No 33 : 1989
Unvented Hot Water Storage
Systems — Hot Water Discharges from Safety
Devices. BBA Requirements and Guidance
.
(4) The discharge pipe from the expansion valve
should be laid with a continuous fall to terminate in
a suitable location. The details applying to
6
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