Description 1; Dhw Temperature Control; Ch Control; Immersion Heater - Vaillant uniSTOR VIH GB 125 S Instructions For Installation And Use Manual

1 Description
The uniSTOR range of unvented hot water storage
cylinders are indirectly heated cylinders which are
designed for use with UK standard boilers in hot water
supply systems.
uniSTOR cylinders are available in six sizes; 125, 155, 180,
210, 260 and 310 litre. The cylinders are of stainless
steel construction, insulated with EPS and enclosed in a
decorative casing. They are supplied with all necessary
cold and hot water controls and a 2 port valve for
control of domestic hot water.
The uniSTOR cylinders operate using a mains water
pressure supply and do not require a feed from a cold
water storage tank. The uniSTOR cylinders have 22 mm
DHW outlet and cold water mains inlet connections for
optimum flow rate. To achieve optimum performance
from the uniSTOR an adequate cold water mains supply
pressure and flow rate must be available (see section
4.1.2: Mains Water pressure).

1.1 DHW Temperature Control

The uniSTOR is supplied fitted with a user adjustable
domestic hot water (DHW) thermostat which controls a
2 port motorised valve and hence the temprature of the
water in the uniSTOR.

1.2 CH Control

Central heating is controlled by a separatly fitted 2 port
valve in conjunction with suitable external controls, such
as a programmer, room thermostat or thermostatic
radiator valves. The external electrical controls should
be wired to the 2 port valve and cylinder thermostat in
the normal way, as shown in the section Electrical
Connections and Controls.

1.3 Immersion Heater

uniSTOR cylinders are also provided with an auxiliary
back up 3 kW electric immersion heater, including
operating thermostat and energy cut out.
The immersion heater is fitted behind the front panel.
It is designed for use in unvented installations and
contains a safety overheat thermostat in addition to the
operating thermostat.
For the uniSTOR 260 and 310 an additional second
immersion heater will be available as an accessory.
Note:
Only the correct immersion heater containing a
safety overheat thermostat may be used for
replacement.
uniSTOR GB

1.4 Applications

The Vaillant uniSTOR can be connected to any UK
standard boiler.

1.5 Typical applications

– Single bathroom property:
uniSTOR 125
– Single bathroom property with an en-suite shower
room:
uniSTOR 125 / 155
– Two bathroom property:
uniSTOR 155 / 180
– Two bathroom property with an en-suite shower room:
uniSTOR 180 / 210
– Larger properties:
uniSTOR 260 / 310
Commercial use:
Size depending upon hot water requirements
Note:
1 Select the appropriate boiler to match the
heating load (with the normal allowance for
heating up from cold) plus an allowance for
heating the hot water cylinder. Typically it is
practice to allow an additional 2-3 kW for the
hot water production.
2 Consideration should be given to the use of a
larger size of cylinder than shown above
where high water demands are likely.

Description 1

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