9
9
ENGLISH
GENERAL
WATER CIRCUIT
The diagram below illustrates the water connections between solar collectors and a storage heater.
3
1
1
R
M
°C
M
4
4
4
9
8
11
10
13
14
2
6
12
Water control system
5
7
15
16
17
17
18
1 - Solar collector
2 - Storage heater
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 - Plugs
18 - Heat transfer fluid recovery
M - Collector outlet
R - Collector return
b
Connect no more than 6 collectors in series.
b
If copper pipes are used, joints must be hot brazed.
b
We recommend the use of stainless steel pipes
specially 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).
60
50
30
10
40
20
0
0
100
200
300
400
500
600
700
800
900
1000
Pressure drop (mbar)
Flow rate (kg/h)
Pressure drop in solar collectors (*)
(*) With antifreeze-water mix of 33,3% / 67,7% and heat transfer medium temperature = 20°C.
