13.13 Intended use
The appliance is only intended to be installed and operated in sealed
unvented systems that comply with EN 12828 / DIN 1988, or solar
thermal systems that comply with EN 12977, with due attention paid
to the associated installation, service and operating instructions.
DHW cylinders are only designed to store and heat water of potable
water quality. Heating water buffer cylinders are only designed to
hold fill water of potable water quality. Only operate solar collectors
with the heat transfer medium approved by the manufacturer.
Intended use presupposes that a fixed installation in conjunction with
permissible, system-specific components has been carried out.
Commercial or industrial usage for a purpose other than heating the
building or DHW shall be deemed inappropriate.
Any usage beyond this must be approved by the manufacturer for
the individual case.
Incorrect usage or operation of the appliance (e.g. the appliance
being opened by the system user) is prohibited and results in an
exclusion of liability.
Incorrect usage also occurs if the components in the system are
modified from their intended use (e.g. through direct DHW heating in
the collector).
Adhere to statutory regulations, especially concerning the hygiene of
potable water.
Appendix
14.1 Subsidy programmes, permits and insurance
Solar thermal systems play an important role in protecting natural
resources and the environment. Together with advanced Viessmann
heating systems, they create an optimum, futureproof system solu-
tion for DHW and swimming pool heating, central heating backup
and other low temperature applications. This is why solar thermal
systems are frequently subsidised by government.
Application forms and subsidy conditions can be obtained from the
Federal Office for Economic Affairs and Export Control
(www.bafa.de). Solar thermal systems are subsidised by some
national, regional and local authorities. Further information is availa-
ble from our sales offices.
Information regarding current subsidy programmes is also available
at "www.viessmann.com" (Fördermittel [Subsidies]>Förderprog-
ramme des Bundes [Subsidy Programmes in Germany]).
Viessmann collectors meet the requirements of the "Blue Angel" cer-
tificate of environmental excellence to RAL UZ 73. The approval of
solar thermal systems is not universally regulated. Your local plan-
ning office will be able to advise you on whether solar thermal sys-
tems need planning permission.
Viessmann solar collectors are tested for impact resistance, for
example against hailstones, to EN 12975-2 or ISO 9806. Neverthe-
less we recommend that the user insures against extreme weather
conditions and includes the collectors on their buildings insurance.
Damage due to these conditions is excluded from our warranty.
14.2 Glossary
Absorber
Device contained inside a solar collector designed to absorb radia-
tion energy and transfer this as heat to a liquid.
Absorption
Radiation absorption
Irradiance (insolation)
Radiation level impacting on a unit of surface area, expressed in
W/m
2
Emission
Radiation of beams, e.g. light or particles
Evacuating
Extraction of the air from a container. This reduces the air pressure,
creating a vacuum.
Steam-producing power
The power of the collector array in W/m
2
that, during stagnation, is
transferred into the pipework in the form of steam. The max. steam-
producing power is influenced by the draining characteristics of the
collectors and the collector array (see page 133).
Steam spread
Length of the pipework that is subjected to steam loads during stag-
nation. The max. steam spread is dependent on the heat loss char-
acteristics of the pipework (thermal insulation). Conventional details
refer to 100 % insulation thickness.
Heat pipe
Sealed capillary container that contains a small volume of highly vol-
atile liquid.
Condenser
Device where steam is precipitated as a liquid.
Convection
Transfer of heat by the flow of a medium. Convection creates energy
losses caused by a temperature differential, e.g. between the glass
pane of the collector and the hot absorber
Standard roof pitch
The roof pitch limit, at which the roof cover is considered to be ade-
quately protected against the ingress of rain, is described as the
standard roof pitch.
The rules stated here correspond to the rules of the [German] roof-
ing contractor trade. Observe the manufacturer's instructions if these
differ.
Information regarding design and operation
(cont.)
138
VIESMANN
VITOSOL
14
5822 440 GB
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