Vaillant uniSTOR Operating Instructions Manual page 25

3
4 2
5
1
19
15
13
Fig. 3.2 Functional elements of uniSTOR domestic hot water
cylinder
Key
1 Hot water draw off
2 Expansion relief valve (one-way valve, 6.0 bar)
3 Pressure reducing valve (3.5 bar) with line strainer
4 Cold water connection
5 Balanced pressure cold water inlet
6 Connection for hot water expansion vessel
7 Cylinder connection
8 Hot water expansion vessel
9 Tundish
10 Cylinder drain valve
11 Primary heater return
12 Cold water inlet
13 Primary heating circuit thermal cut-out, set to 80 ºC, to be con-
nected to the two port motorised valve in order to isolate the
primary heat source if a fault occurs.
14 Cylinder thermostat (25°C to 65°C)
15 Primary heating circuit immersion sleeve (NTC)
16 Primary heater flow
17 Two port motorised valve
18 Double pole isolating switch for electric immersion heater
19 Electric immersion heater with thermostat and thermal cut-out
20 Temperature and pressure relief valve (90°C, 7 bar)
Installation and maintenance instructions for uniSTOR 0020111105_00
20
3
18
17
16
14
12
11
Description of the unit 3
1
9
10
2 3
4
7 6 5
8
9