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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.