GENERAL
10
WATER CIRCUIT
The diagram below illustrates the water connections between solar collectors and a storage cylinder.
3
1
1
R
M
°C
M
4
4
4
9
8
11
17
10
13
14
2
6
12
Gruppo idraulico
5
7
15
16
1 - Solar collector
2 - Storage cylinder
3 - Collector probe
4 - Disconnect valves
5 - Non-return valve
6 - Temperature gauge
7 - Vent valve
8 - Safety valve
9 - Pressure gauge
10 - Drain
11 - Expansion vessel
12 - Pump
13 - Flow regulator
14 - Flow meter
15 - Vent cock
16 - Manual bleed valve (accessory)
17 - Heat transfer fluid recovery
M - Collector outlet
R - Collector return
b
Connect no more than 6 collectors in series.
b
We recommend the use of stainless steel pipes spe-
cially made for solar collectors for the outlet, return
and probe pipes. The probe cable should be of the
shielded type.
b
Do not use plastic or multistrate pipes. Operating
temperature can exceed 180°C.
b
Pipe lagging must be able to resist high tempera-
tures (180°C).
Water system
Diameter of connection pipes for a specific flow rate of 30 lt/m
2
h
Total surface area (m
2
)
2 - 4
6 - 12
14 - 20
Diameter of copper pipe (mm)
10 - 12
14
18
Diameter of steel pipe (inch)
3/8" - 1/2"
1/2"
3/4"
Pressure drop in solar collectors
Pressure drop (mbar)
Flow rate (l/h)
700
800
900
600
500
400
300
200
100
0
0
1000
2000
3000
4000
5000
6000
CSV 25 R
CSV 35 R
