Vaillant uniSTOR - Safety Devices; Cylinder Operating Elements

10 Installation and maintenance instructions for uniSTOR 0020111105_00
The uniSTOR domestic hot water cylinder is available in
six sizes: 120, 155, 180, 210, 260, and 310 litres. The cylin-
der is made from stainless steel and is insulated with
EPS with heat radiation absorbers. The cylinder is sup-
plied along with all required cold and hot water control
devices and a two port motorised valve.
The cylinder works with the pressure of the water supply
line and does not need a cold water tank for its supply.
The cylinder has hot and cold water inlets with a diame-
ter of 22 mm. To enable the cylinder to work as well as
possible, a cold water supply with a dynamic pressure
and flow rate that are appropriate for the system is
required (¬ section 5.3.1).
Typical applications:
– Property with a single bathroom:
uniSTOR 120 litres
– Property with a single bathroom and additional shower:
uniSTOR 120 or 155 litres
– Property with two bathrooms:
uniSTOR 155 or 180 litres
– Property with two bathrooms and additional shower:
uniSTOR 180 or 210 litres
– Larger properties: uniSTOR 260 or 310 litres
3.1.1 Safety devices
The cylinder is delivered with all safety and control
devices for the operation of the unvented domestic hot
water supply system:
– Temperature and pressure relief valve (90 °C, 7 bar)
– Pressure reducing valve (3.5 bar) with line strainer
– Expansion relief valve (one-way valve, 6.0 bar)
– Thermal cut-out for electric immersion heater
– Primary heating circuit thermal cut-out, set to 80 ºC, to
be connected to the two port motorised valve in order to
isolate the primary heat source if a cylinder thermostat
fault occurs.
3.1.2 Cylinder operating elements
1
2
3
4
5
6
4
5
2
1
3
Fig. 3.3 Cylinder operating elements
Key
1 Electric immersion heater cover
2 Cover cap for reset button for reheating circuit TCO
3 Primary heating circuit temperature controller
4 Primary heating circuit thermal cut-out
5 Cylinder thermostat
6 Electric immersion heater
The following are premounted at the factory for the
unvented uniSTOR domestic hot water cylinder:
– Cylinder thermostat(5) and reheating circuit thermal
cut-out(4)
– Electric immersion heater(6) with thermal cut-out and
cylinder thermostat
The cylinder must be properly wired in order to comply
with G3 building regulations.
3 Description of the unit