58
Commissioning
the System
14
Commissioning the System
Height Difference
Initial Pressure for Expansion Tank
Operating Pressure at 20°C
(height of collector field -
(setting on valve, behind cover cap)
(0.2 to 0.5 mbar greater than
height of expansion tank)
initial pressure)
-5m
~1.0 bar
~1.3 bar
< 0m
~1.0 bar
~1.3 bar
< 5m
~1.5 bar
~1.8 bar
< 10m
~2.0 bar
~2.3 bar
< 15m
~2.5 bar
~2.8 bar
> 15m
Separate dimensioning of safety device required
Number of Solar Collectors
≤
5
6
8
9
12
Type of Connection
Up to 5
2 x 3
2 x 4
3 x 3
4 x 3
in series
parallel
parallel
parallel
parallel
Diameter of forward and return flow pipe
15mm
18mm
18mm
22mm
22mm
Minimum volume flow
2-3 l/min
4-5 l/min
4-5 l/min
6-8 l/min
6-8 l/min
Setting the Flow Rate
The setting of the volume flow for the
heat transfer fluid is made via the
setting for the revolution levels (I, II, III)
of the circulating pump and the
restrictor in the flush/fill panel.
The flow indicator displays the volume
flow set. The display range is between
1 and 13 litres per minute.
Note:
For larger installations, please contact
Grant Technical Department for
assistance.
Read off the
volume flow
values on the
top edge of
the rotameter.
Figure 122:
Flow Indicator
Releasing Trapped Air
The residual air from the heat transfer
fluid is collected in the air separator and
manually released via the air vent.
To do so, push a plastic tube on to the
the air vent outlet and catch the fluid
that is released in a suitable container.
Ventilation may be carried out only
by trained specialists. Unchecked
ventilation leads to pressure loss
and disruption in the system.
Caution:
Danger of scalding!
The temperature of both the escaping
air and the heat transfer fluid can
exceed 100°C.
Figure 123:
Releasing Trapped Air
Table 10: Initial Expansion Vessel Pressure and Operating Pressure
Table 11: Pipe diameters and flow rates
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