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16 | Commissioning
AGS10-2, AGS10E-2, AGS20-2, AGS50-26 720 811 270 (2015/04)
6.3.2 Checking the flow rate
Refer to Tab. 13 for the required flow rate (at 30-40 °C in the return).
Check the flow rate in the sight glass of the flow limiter (
Fig.
27
[3]).
6.3.3 Setting the flow rate
It may be necessary to reduce the flow rate for solar systems with up to
4 flat plate collectors (or 3 evacuated tube collectors).
Set the speed to 100 % on the solar controller ( controller
instructions: "Function test").
If the maximum flow rate ( Tab. 14) is exceeded:
Reduce the flow rate at the flow limiter [2] until the flow rate drops
below the maximum.
After commissioning
The viscosity of the heat transfer fluid makes air bubbles substantially
more resilient than those in pure water.
After several hours of solar pump operation, vent the solar system via
the air separator in the solar pump station [4] and (if installed) the air
vent on the roof.
Fig. 27
[1] Gravity brake ready for operation
[2] Adjusting screw on the flow limiter, depending on the type
[3] Read-off edge for the flow rate, depending on the type
[4] Ventilation at the air separator
If the pre-set flow rate is not reached at the pump's
highest speed stage:
Check maximum permitted pipe lengths and sizing
( Chapter 4.1).
If necessary, install a more powerful solar pump.
Quantity Flat plate l/min
1)
1) Nominal flow rate per collector: 50 l/h
Evacuated tube l/min
2)
2) Nominal flow rate per collector: 30 l/h
1 1 0.5-0.6
2 1.5-2 1-1.2
3 2.5-3 1.4-1.8
4 3-4 1.9-2.4
5 4-5 2.4-3.0
6 5-6 2.9-3.6
7 5.5-7 3.3-4.2
8 6.5-8 3.8-4.8
9 7.5-9 4.3-5.4
10 8-10 4.8-6.0
11 9-11 5.2-6.6
12 10-12 5.7-7.2
13 10.5-13 6.2-7.8
14 11.5-14 6.7-8.4
15 12.5-15 7.1-9.0
16 13-16 7.6-9.6
17 14-17 8.1-10.2
18 15-18 8.6-10.8
19 15.5-19 9.0-11.4
20 16.5-20 9.5-12.0
Table 13 Maximum flow rate at 30 - 40 °C in the return depending on
collector version and number of collectors
Low energy pumps do not require a step switch as they
are modulated using a control signal.
Quantity Flat plate l/min Evacuated tube l/min
1 2.5 --
2 5 5
3 7.5 7.5
4 10 10
Table 14 Flow rate (maximum flow rate) at 30 - 40 °C in the return
depending on collector version and number of collectors
0,5
7
6
5
4
3
2
1
L/min
7
6
5
4
1
0,5
3
2
6720801165.19-2.ST
1
20
0
40
60
°C
80
100
120
20
0
40
60
°C
80
100
120
S E
3
2
4
16


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