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2.3
Basic safety instructions
Installation, commissioning, and maintenance
Installation and adjustment as well as service, mainte-
nance and repair must be carried out by a competent
person approved at the time by the Health and Safety
Executive and be in accordance with the relevant
requirements of the Local Authority, Building Regula-
tions, Building Regulations (Scotland), Building Regula-
tions (Northern Ireland), and the bye-laws of the local
Water Undertaking.
Cylinder safety information
This product has been assessed and found to comply
with the requirements of the Building Regulations for
unvented hot water storage systems and must not be
altered or modified in any way.
> In the event of parts replacement, use only genuine
spare parts supplied by Vaillant Ltd.
> You must also observe the guidelines of the local water
utility companies.
If the water does not meet the requirements of The
Water Supply (Water Quality) Regulations 2000 (Amend-
ment) Regulations 2007, corrosion damage may occur
to the cylinder.
> Only use the cylinder to heat potable water.
Preventing frost damage
You should not turn the gas-fired wall-hung boiler off
completely so that you can still use all of the safety
functions for your heating system. If you want to take
the unit out of operation for a relatively long period of
time in an unheated room at risk of frost, you must com-
pletely drain the cylinder.
Avoiding damage caused by leaks
If there are leaks in the pipework, close off the cold
water stop valve on the safety assembly and notify a
competent person so that they can rectify the leaks.
Preventing damage due to unauthorised changes
to the unit
Changes to the supply lines, relief valve termination, and
expansion relief valve may only be carried out by a com-
petent person!
> The installed safety devices must always be used.
Avoiding damage resulting from the closing of the
expansion relief valve
Never shut off the expansion relief valve or relief valve
termination.
Operating instructions for uniSTOR 0020111106_01
Safety instructions 2
5
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