Operation manual of solar controller SR1568
Page 72 of 87
Adjust the antifreeze type and concentration of the heat transfer fluid under menu MEDT and
MED%
For the systems with 2 collector fields, sensor should be installed on the general flow and
return pipe for heat quantity measurement.
T6：Flow sensor
TVFS：Return sensor
Display unit of heat quantity for current day is DkWh, Accumulated heat quantity displays as
kWh or MWh, sum of current day quantity and accumulated quantity becomes total energy
output.
GFDS Grundfos flow rotor
Under this menu, the grundfos direct sensor can be activated or deactivated, and its
measurement range can be set.
Flow rate monitoring
The flow rate monitoring function (OFLOW) can be used for detecting malfunctions that
impede the flow rate and for switching off the corresponding tank. This will prevent system
damage, e. g. through a dry run of the pump.
If the allocated relay is energized, the flow rate will be monitored at the allocated sensor. An
error message will appear when no flow rate is detected at the allocated sensor after the
delay time (DELAY) has passed.
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