Spreaded loading option
In 2-store systems with 2 pumps, a spreaded loading function can be activated:
As soon as the adjustable temperature difference DTSE between the collector
and the priority store is reached, the second store will be loaded in parallel unless
it is blocked. If the temperature difference falls by 2 K below DTSE, the pump is
switched off.
The collector temperature has to be higher than the store temperature.
Loading logic
In systems with 2 stores or store loading in layers, store sequence control can be
adjusted.
In 1-store systems, only the menu item PDELA will be available.
Store sequence control
If the priority store cannot be loaded, the subordinate store will be checked. If
useful heat can be added, it will be loaded for the circulation time.
After this, the loading process stops and the controller monitors the increase in
collector temperature during the loading break time. If it increases by 2 K, the break
time timer starts again to allow the collector to gain more heat. If the collector
temperature does not increase sufciently, the subordinate store will be loaded
again for the circulation time.
As soon as the switch-on condition of the priority store is fullled, it will be loaded.
If the switch-on condition of the priority store is not fullled, loading of the second
store will be continued. If the priority store reaches its set temperature, store se-
quence control will not be carried out.
The minimum runtime of each loading process is 3 min.
In systems with 2 stores or store loading in layers, all stores / store zones will be
loaded to their set temperature (according to their priority and store sequence
control). Only when all stores / store zones have exceeded their set temperature
will they be loaded up to their maximum temperatures, again according to their
priority and store sequence control.
If store sequence control is active and the system switches to load the priority
store, the parameter Loading break also acts as a stabilisation time, during which
the switch off temperature difference will be ignored.
Overrun
By means of this function, store loading continues after the temperature difference
between the collector and the store has fallen below the switch-off difference. It
switches off if the temperature difference between the allocated ow and return
sensors falls below the switch-off difference DT(2)F.
tLB
Loading break time
Adjustment range: 1 … 30 min
Factory setting: 2 min
PDELA
Pump delay
Selection: ON / OFF
Factory setting: OFF
tRUN
Circulation time
Adjustment range: 1 … 30 min
Factory setting: 15 min
PSPEE
Pause speed
Selection: ON / OFF
Factory setting: OFF
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