Setting multi-function controllers (MFC)
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Energy yield measurement in any hydraulic circuit is possible with yield measurement 1
(set as independent) and energy yield measurement 2.
This is also possible with energy yield 3 to 6 if flex 400 modules are connected optionally.
An additional flow sensor or vortex flow sensor is needed for energy yield measurement 2
and 3–6 (when flexboxes connected). This additional sensor must be installed in the
hydraulic circuit which is to be measured. Note the flow sensor specifications.
The two temperature sensors needed can be freely assigned to the function. It is thus
possible to measure the energy yield in any hydraulic circuit.
5.1
DFG (flow sensor)
The flow sensor measures the flow rate mechanically. It is located on the return flow pipe
of the solar power system. To determine the energy output with a flow sensor, the pipe-
mounted sensor S4 must also be connected for temperature measurement.
5.2
VFS (vortex flow sensor)
The VFS measures the flow rate and the temperature. The following types can be installed
in the solar power system:
•
VFS Type 1–20 (Measuring range of 1 to 20 litres/minute)
•
VFS Type 2-40 (Measuring range of 2 to 40 litres/minute)
5.3
DFA (flow indicator)
Only with yield measurement 1 in the solar circuit.
In the case of this measurement principle the flow rate is measured just the once by a flow
indicator (flow indicator on the solar pump group – Tacosetter or adjustment valve) at a
pump output of 100 % (e. g. in manual mode). The measurement value is entered at the
controller. The flow indicator can then be removed again. The energy output is
determined on the basis of this measurement value.
If you use the "Flow indicator" measurement principle, you must make sure that
you do not operate the solar circuit pump with speed control. This would lead to
incorrect results for the energy yield measurement. Enter the value "100 %" in the
"Program/Solar circuit/Speed control" menu item.
