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Hydraulic Components SDC / DHC
196 EN2H-0221GE51 R0808
7.3.6 Solar/Solid fuel/Buffer
7.3.6.1 Solar function
The solar function makes it possible to combine solar power
systems with heating and hot-water production systems in order
to support the economy of the system. The solar loading pump
can be controlled according to various switching conditions.
This function can only be called up, if a configurable switching
output was occupied with a solar loading pump.
Two separate sensor inputs are available for the connection of the
sensors:
• KVLF for the solar collector sensor
• KSPF for the collector tank sensor
For heat metering, an optional collector return sensor (KRLF) can
be connected via a variable input (VI1 - VI3).
The solar loading pump is disabled if the collector flow sensor is
defective.
(switching differential ON)
With sufficient solar heat energy, the temperature differential
between collector flow and tank will become bigger than the set
value and the solar loading pump is switched on to load the buffer
tank. The minimum set value is 3 K above the switch-off
differential.
(switching differential OFF)
If the temperature differential between the collector flow and tank
falls below or equal to the set value, the solar loading pump is
switched off and loading terminated. The maximum set value is
always 3 K below the selected switch-on differential.
The activated solar loading pump remains in operation for this set
time. The minimum runtime has priority over the switch-off
differential (switching differential OFF).
This limit is used for thermal protection of the collector and causes
forced switch-on of the solar loading pump if the set value is
exceeded. If the temperature drops below the set value –5 K, all
solar functions become active again based on their settings.
Function
NOTE
NOTE
Solar switch-on
differential
Solar switch-off
differential
Minimum runtime of
solar loading pump
(SOP)
Collector maximum
temperature limi
t