Manual - Solar hot water systems
52
8
6a 6b
15
14
13
12
1
2
5
3
20
19
10
9
21
11
Fig. 6.1 Start-up of the total system
Flushing and filling the solar circuit and subjecting it to
a hydraulic pressure test
Flushing is performed from the solar pump unit to the
cylinder via the collector. This is how to do it:
• Open the fill/vent valve (
1
) and connect the filling
pump to the fill/vent valve (
1
).
• Place the three-way ball valve (
15
) into flush position.
• Connect the drain hose of the Vaillant filling pump or a
similar hose with filter (
9
) to the fill/drain valve (
12
).
Put the other end into the solar fluid container (
10
).
• Pump in solar fluid from the container by the filling
pump (
19
) via the fill/drain valve (
1
), so that the solar
fluid from fill/drain valve (
12
) is filtered and flows back
into the container.
• To flush and filter the solar circuit, pump circularly for
10 minutes. Monitor the filter and clean it if necessary.
A self-priming pump with a pressure of 2 to 3 bar is
required
to fill the solar circuit. This is how to do it (see
Fig. 6.1):
• After flushing close the fill/drain valve (
12
) and pump
in solar fluid once a pressure of 1.7 bar is achieved.
• Close the fill/vent valve (
1
) too and place the three-
way ball valve (
15
) into circulation position.
• Switch off the filling pump and switch on the solar
pump (
13
) to allow air bubbles to escape via the
bleeder.
• Block the gravity brakes (
8
and
14
) (position 45°) to
discharge the remaining air.
• When bleeding is completed release the gravity brakes.
Collector circuit filling pressure
The filling pressure Pa should be approx. 0.5 bar over
the static pressure Pstat.
Pa = h x 0.1 + 0.5 bar
6.2
Setting the flow rate and pump
0,
5
1
2
3
0,
5
1
2
3
4
5
6
4
5
6
L/
min
L/
min
1,1 l/min
1
2
Fig. 6.2 Setting the flow rate
The 3-speed circulating pump can be fine-tuned to
adjust the flow rate to the collector's performance.
h
Note!
We recommend a value of 0.66 l/min per m
2
collector surface area.
This is how to do it:
•
Use Table 6.1 to calculate the flow rate to be set by
multiplying the installed collector surface area with
the value of 0.66 l/m
2
• min.
• Set the pump speed to roughly set the flow rate.
•
Use an Allen key to finely adjust the flow rate at the
adjustment valve (see Fig. 6.2 Pos.
1
).
The adjusted flow rate can be viewed on the display (
2
).
Table 6.1 and 6.2 provide reference values for possible
pump speeds depending on the collector connection and
pipe length and cross-section.
If you use auroMATIC 560 solar control, the flow rate
can be used to calculate the gain. To make an accurate
calculation, the flow rate must be entered on the
controller. You can find further information in the
operating and installation manual of the control.
6 Start-up
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