Manual

16
5 Commissioning
You must adhere to the following procedure for the
commissioning of the total system:
Use only Glow-worm solar uid (item no. 0020054968) for
pressure tests and for ushing and lling the solar circuit.
5.1 Flushing and filling the solar circuit
Glow-worm recommends using the Glow-worm lling pump,
part no. 0020054986, to ush and ll the solar circuit. Observe
the separate user manual when using the Glow-worm lling
pump.
Expansion vessel admission pressure
During the commissioning, the gas side admission pressure
p
v
of the expansion vessel must be adjusted to the equipment
height whilst disconnected. The static pressure p
stat
corresponds, to a certain extent, to the static height h between
the collector array and the expansion vessel.
10m static height correspond to approx. 1 bar.
p
v
= p
stat
= h x 0.1 but not less than 1.5 bar.
NOTE: A deviation from the optimum admission or lling
pressure always results in a reduction of the expansion
vessel's effective volume. This can cause operational
malfunctions.
Flushing is performed from the solar pump station to the
cylinder via the collector.
A self-priming pump with a pressure of 2 to 3 bar is required
to ll the solar circuit.
Collector circuit lling pressure
The lling pressure Pa should be approx. 0.5 bar over the
static pressure Pstat.
Pa = h x 0.1 + 0.5 bar but not less than 2 bar.
5.2 Setting the flow rate / pump speed
The 3-speed circulating pump can be ne-tuned to adjust the
ow rate to the collector's performance.
NOTE: We recommend a value of 0.66 l/min per m2 collector
surface area.
This is how to do it:
Use Table 5.1 to calculate the ow rate to be set by
multiplying the installed collector surface area with the value
of 0.66 l/m2 • min.
Set the pump speed to roughly set the ow rate as follows:-
Let the pump run rst at the lowest speed (minimum power
consumption).
Check whether the calculated value is achieved on the ow
rate meter.
0,5
1
2
3
0,5
1
2
3
4
5
6
4
5
6
L/min
L/min
1,1 l/min
Adjustment
Valve
Flow Rate
Display
14168
Diagram 5.1
EXAMPLE: The installed (net) collector surface area for
Clearly Solar collectors is 2.35 m
2
. Multiplied with the value
for the specic ow rate of 0.66 l/m
2
• min, it results in a
calculated ow rate, which should be indicated by the ow
rate meter, see diagram 5.1.
Select the next pump speed if the calculated ow rate is not
achieved on the ow rate meter. Switch to a lower speed if it
is exceeded. If the ow rate cannot be achieved even at the
highest pump speed, check whether it is possible to use fewer
collectors in series reverting to a combination of series and
parallel connections (eg 2 collectors in series in parallel with
an additional 2 collectors in series).
Use an Allen key to nely adjust the ow rate at the
adjustment valve, see diagram 5.1.
The adjusted ow rate can be viewed on the display, see
diagram 5.1.
Table 5.1 provides reference values for possible pump speeds
depending on the collector connection and pipe length and
cross-section.
The ow rate can be used to calculate and display the
gain. To make an accurate calculation, the ow rate must
be entered into the Fluropro solar control. You can nd
further information in the separate system wiring instructions
including the Fluropro solar control.
The pump speed is used to achieve a particular ow rate
in the collector array. The nal ow rate should not be
signicantly above or below the calculated value. Up to 10%
lower solar gain or unnecessarily high power consumption of
the pump could occur.
Clearly Solar, solar collector panel Flow rate
Minimum cross-section of the copper pipe in the
solar circuit at a total pipe length of:
Number in series l/min 20m 50m
1 1 1.55 15 15
2 2 3.1 15 15
3 3 4.65 15 15
Pump speed: Minimum (speed 1) Maximum (speed 3)
Table 5.1 Layout of pipe cross-section and pump speed depending on the collector connection