Description Of The Appliance 2; Construction And Function; Conformity With Directives; Model Overview - Vaillant uniSTOR Operating And Installation Manual

2 Description of the appliance
2.1

Construction and function

Vaillant VIH S 300/400/500 solar cylinders are used as
indirectly heated DHW cylinders for solar-assisted hot
water generation.
Vaillant VIH R 300/400/500 cylinders are indirectly
heated DHW cylinders.
Vaillant VIH RW 300 cylinders are indirectly heated
DHW cylinders intended specifically for heat pumps.
The cylinders and the pipe coils are enamelled on the
DHW side to ensure long service lives. Each tank has a
magnesium sacrificial anode for additional corrosion
protection. A maintenance-free external current anode
is available as an accessory.
The CFC-free EPS insulation provides the best thermal
insulation.
Furthermore, an electric heating element (accessory)
can be installed in the cylinders (except for the
VIH RW 300) to support post-heating, so that post-heat-
ing by the boiler can be completely dispensed with in
summer operation.
The heat is transferred by means of one (VIH R, RW) or
two (VIH S) welded-in coiled pipes.
The cylinder is connected to the water mains via the
cold water connection and to the draw-off points via the
hot water connection. If hot water is run from one of
the draw-off points, cold water will flow into the cylinder
where it is heated up to the temperature set on the cyl-
inder temperature controller.
VIH S only
In VIH S type solar cylinders, the heating takes place in
two separate circuits.
The solar heat exchanger is located in the lower, cold
area. The relatively low water temperatures in the bot-
tom area ensure optimum heat transfer from the solar
circuit to the storage water even if there is only a low
level of solar radiation.
In contrast to solar heating, the hot water is post-heat-
ed by the boiler or circulation water heater in the upper,
warmer zone of the cylinder. The standby volume for
post-heating is about a third of the cylinder volume.
2.2

Conformity with Directives

We confirm that our product is manufactured in accord-
ance with the EU Pressure Equipment Directive.
Operating and Installation Manual for uniSTOR, auroSTOR, geoSTOR Cylinders 0020080043_00

Description of the appliance 2

Safety instructions and regulations 3

2.3

Model overview

The cylinders are available in the following sizes:
VIH S
VIH S 300
VIH S 400
VIH S 500
Table 1.1 VIH S model overview
VIH R
VIH R 300
VIH R 400
VIH R 500
Table 1.2 VIH R model overview
VIH RW
VIH RW 300
Table 2.3 VIH RW model overview
2.4

Identification plate

An identification plate has been fixed to the top of the
casing at the factory.
3 Safety instructions and regulations
Vaillant VIH S, VIH R and VIH RW cylinders are con-
structed using state-of-the-art technology in accordance
with recognised safety regulations. Nevertheless, there
is still a risk of injury or death to the user or others or
of damage to the unit and other property in the event of
improper use or use for which they are not intended.
a Caution!
The units may only be used to heat up drinking
water. Damage to the appliance due to corro-
sion cannot be excluded if the water does not
correspond to the specifications of the drinking
water ordinance.
3.1

Safety instructions

The VIH S 300/400/500 solar cylinders and
VIH R 300/400/500 and VIH RW 300 cylinders must be
installed by a qualified heating engineer, who is respon-
sible for compliance with existing regulations, rules and
directives.
We only honour the manufacturer's warranty if the in-
stallation is performed by an approved qualified servic-
ing company which is also responsible for the inspec-
tion/maintenance of, and repairs and alterations to the
cylinders.
Safety valve and blow-off line
The water volume is increased each time the hot water
is heated in the cylinder, which is the reason why each
cylinder must be equipped with an expansion relief valve
and an exhaust line.
Cylinder volume
289 litres
398 litres
484 litres
Cylinder volume
295 litres
404 litres
496 litres
Cylinder volume
285 litres
3