Ariston ST 80 ProTech Petunjuk Pemasangan, Servis & Pengoperasian - Halaman 5
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3.
INSTALLATION
3.1
Water Regulations
3.2
Building Regulations
3.3
General Guidance
The appliance should be installed in accordance with the Domestic Heating
Compliance Guide.
These regulations (byelaws in Scotland) ensure a good supply of
wholesome water, ahd that only approved materials, pipes and fittings are
used to convey water.
These are a statutory document and take priority over all other regulations
and recommendations. The installation of an unvented hot water storage
cylinder is classified as a "Controlled Service" and Regulation G3 applies. To
meet the requirements of the Regulation, installation of an unvented system
should be undertaken by a "competent installer".
All installations of unvented hot water storage systems having a capacity of
more than 15 litres should be notified to the relevant Local Authority by
rrieans of building notice or by the submission of full plans. It is important to
note that it is a criminal offense to install an unvented hot water storage
system without notifying the Local Authority. The installation of the unvented
cylinder and hot water system must comply with BS 6700 and the HSE
Legionella Code of Practice.
Current guidance notes do not cover the connection of a solar thermal
circuit to an unvented storage vessel (cylinder). However, if guidance is
sought for compliance with current regulations the fundamental principle is
to provide a failsafe means of shutting off the solar input to the heat
exchanger if the cylinder temperature should rise above the set temperature
of the cylinder's energy cut out. (See Note 1).
As with all unvented hot water systems, notification of intention to install
should be given to your local building control.
Option A. A non self resetting mechanical shut-off should be installed on
the solar primary flow to the cylinder. The mechanical shut-off should be
suitable for use with a solar primary circuit (i.e. high temperature and glycol
resistant). The mechanical shut-off should be integrated electrically with the
cylinder energy cut out/s and if necessary the solar circuit temperature
control, please refer to the solar controller manufacturer for further
information.
Option B. Where the solar controller and hydraulic system demonstrate that
by no lesser means the requirement in Option A is satisfied by other means;
certification by an approvals body is required to demonstrate that in the
event of the stored water going over temperature, the heat input to the
cylinder is isolated by physical means and Is non self resetting.
These systems should be clearly identified with reference to the approvals
body. (See Note 2)
Note 1 :Whilst most solar cylinders use a coil type heat exchanger other
options such as external plate to plate devices , external annulars or 'tank In
tank' systems may be used but the same control options always apply.
Note 2 :Current approved bodies include the British Board of Agrement
(BBA), WRc-NSF Limited, or KIWA
3.4
Cold Water Supply
The strainer prevents any debris entering the other controls. The pressure
reducer ensures the correct operation of the expansion vessel, and prevents
any damage to the control valves through too great a pressure.
The non-return valve ensures the water expansion is forced into the
expansion vessel and prevents contamination of the mains cold water
supply. The expansion relief valve will discharge expanded water to the
discharge tundish if the expansion vessel fails.
It is important to ensure that the cold water main is capable of supplying the
increased demand which will be imposed on it. Hot and cold water are both
drawn off the same source of supply. Remember, there will not be a storage
tank to help compensate for variations in the demand on thasystem.