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5.4.2 Additional settings for your solar system
The following information on adjustments is applicable for operation without FlowSensor only:
Set the water flow in the solar panel circuits so the flow through every solar panel is 90 to 120 l/h. Either match the flow rate
by setting the speed stage on the solar circuit pump and by throttling on the isolation in the flow meter of the pump unit
EKSRDS1A (Chapter 3 "Montage", Fig 3-4, Item 10). Reference values for correct valve and pump stage settings are listed in
Tab. 5-6.
Always observe the system temperatures during normal system operation as indirect control of the flow volume. Under optimum
solar radiation (clear sky, clear air, sun vertical to solar panels) the temperature increase in the solar panels should be about 10
to 15 K. During operation with pump P
65 °C. If a heat meter is installed in the building, the flow volume can be set by direct measurement during operation of the pump.
Number of
solar panels
Tab. 5-6
Follow the setting instructions in the installation and operating instructions of the connection kit EKSOLHWAV1.
5.4.3 Domestic water hygiene
If no hot water is drawn off for several days and if the storage tank temperature does not reach at least 60 °C as a result of the
solar system, one-off heating to over 60 °C or draining of the stored hot water is recommended for hygienic reasons (Legionella
protection).
EKSR3PA + EKSRDS1A
Control and pump unit for solar systems
4PW56033-1
During operation of the solar system with FlowSensor the flow in the solar system is continuously adjusted for
the requirements with the differential temperature-dependent control system of pump P
, for example at a return temperature of 50 °C, set the solar panel temperature at 60 to
S
Set flow rate in l/min
on solar panel circuit
2
3.6 to 4.8
3
5.4 to 7.2
4
7.2 to 9.6
5
9 to 12
Setting the flowrate on the flow meter
Even if the flow volume is set correctly, the cut-in temperature difference "Delta T on" and good weather condi-
tions will occasionally shut down the solar system. With the sun rising or setting and an increasing storage tank
temperature the solar panel temperature will fall slowly after starting the pumps, the cut-out condition will be
reached. The continuing solar radiation will increase the temperature of the solar panels, the pumps will operate
and the system will cycle because the solar radiation is no longer sufficient for continuous operation. The
FlowSensor reduces this effect by controlling the pump speed.
5
x
Operation
.
S
Set flow rate in l/h
on solar panel circuit
220 to 290
330 to 435
435 to 580
540 to 720
Operating and installation instructions
33
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