any malfunction of the system. It is essential that the
instructions are followed.
6.3 The system has adequate provision for safe
disposal of discharges from the expansion valve
and the combined temperature and pressure relief
valve [see also sections 16(2) and (3)].
Physical contact
6.4 The surfaces of the storage cylinder are
protected by the insulation. In normal use the
temperatures of the surfaces of the various parts of
the system are comparable with those in a
conventional, vented, hot water storage system.
Strength and stability
6.5 The system has adequate resistance to internal
pressures and does not visibly deform when
subjected to a vacuum of 0.1 bar absolute.
6.6 The system’s pressure control devices will
ensure that the operating pressure will be controlled
to a nominal 3 bar and that the design pressure of
5 bar is not exceeded. Each storage cylinder has
been satisfactorily pressure tested to 1.5 times the
design pressure, ie 7.5 bar.
6.7 The weight of the system is stated on the
label attached (see also Table 1); the support
arrangements appropriate to a conventional system
apply.
6.8 Care must be taken to avoid damage to the
system during handling and installation.
Electrical safety
6.9 The thermostat and non-self-resetting thermal
cut-out are approved by the BEAB to BS 3955 :
1986. The immersion heater is approved by the
BEAB to BS EN 60335-2.73 : 2003. To ensure
safety it is essential that the electrical wiring is
carried out in accordance with the
IEE Wiring
Regulations — Regulations for Electrical
Installations, Sixteenth Edition 1991.
7 Properties in relation to fire
7.1 The expanded polyurethane foam insulant is
covered with a steel outer casing and only a small
area of the insulant will be exposed at connection
bosses. In the presence of a source of ignition,
such as a plumber’s blowlamp, the foam will flame
locally and emit toxic fumes. Flaming and fume
emission will stop when the source of ignition is
removed.
7.2 In service, the steel outer casing encloses the
foam and risk of ignition will be minimal. During
installation care should be exercised when using a
blowlamp to make soldered joints on pipework
adjacent to the cylinder. Installation does not require
soldered joints to be made direct to the system.
8 Effect on water quality and prevention of
waste of water
The system is listed by the UKWFBS.
9 Watertightness
The storage cylinder remains watertight at
pressures
in excess of 1.5 times the design pressure,
ie 7.5 bar.
10 Noise
The system is quiet in normal operation, the flow of
water being via conventional water pipe fittings,
and compares favourably with a vented, hot water
storage system.
11 Physiological effects
The insulation is a conventional material. It will not
encourage vermin or bacteria and is not
susceptible to damage from moisture.
12 Maintenance
12.1 It is recommended that, annually, a
competent person
:
• inspects and cleans the line strainer, and
• measures the pressure in the expansion vessel
and recharges as necessary.
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, thermostat, non-self-resetting thermal cut-out
and the immersion heater are as described in the
Certificate.
(3) The tundish and discharge pipework are
correctly located and fitted.
5
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