H.C. – Heating circuit
D.H.W. – Domestic hot water
A – Mains cold water supply/drain
B – DHW cold water supply
1. Return temperature sensor
2. Supply temperature sensor
3. Outside temperature sensor
4. Boiler pump
5. Expansion tank
6. Safety group (safety valve, air vent - air purge,
manometer)
7. Plate heat exchanger/Low loss header
8. Air vent
9. DHW Pump
10. DHW Storage tank
11. DHW Storage tank temperature sensor
12. Check valve
13. Water pressure sensor
14. Room unit / Room thermostat
15. Mixing valve
16. Consumers
17. Cascade return sensor
18. DHW Circulation pump (with timer)
19. HC Pump
20. System supply sensor
21. HC1, HC2, HC3 temperature sensor
Fig. 28. Cascade System with Plate Heat Exchanger / Low Loss Header
1
1
B
12
18
10
11
12
16
19
12
16
19
12
16
19
3
12
9
21
21
21
15
15
15
4
4
HC1
HC2
HC3
17
A
A
5
A
A
1
2
2
1
13
13
12
14
14
14
20
7
6
6
P
P
P
P
5
6
P
12
1
1
B
12
18
10
11
12
16
19
12
16
19
12
16
19
12
9
21
21
21
15
15
15
HC1
HC2
HC3
A
A
5
14
14
14
20
7
3
4
4
17
A
A
1
2
2
1
13
13
12
6
6
P
P
P
P
5
12
I-59
Z-038791_EN • Rev A
A
dditionAl
i
nformAtion
for
the
i
nstAller
