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738.955 | 10.40
EN
Speed control "oFF": Control signal as switched out-
put
When switched on, the solar circuit pump runs at
maximum speed (100 %) and delivers a constant vol-
ume flow.
Spee
d control "on": Control signal speed controlled
When switched on, the solar circuit pump runs at a
controlled speed in the range of 30 ... 100 % and deliv-
ers a regulated volume flow.
The following display appears:
The speed control symbol is displayed
The speed control function, however, makes a distinc-
tion between the "differential temperature control"
and "absolute temperature control":
Diff
erential temperature control "diF":
The control system attempts to maintain a
constant temperature difference between the
collector and the storage tank. The solar circuit
pump performance is continuously adjusted and
the volume flow is increased or reduced, depend-
ing on the temperature difference. The specified
temperature difference is fixed at 8 K.
Abso
lute temperature control "AbS“
The solar circuit pump is controlled in such a
manner that the collector temperature sensor
T1 is kept at the absolute temperature as con-
stantly as possible so that the storage tank can
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