6
Note:
If the drainback function ODB is activated, the factory settings of the
parameters DT O, DT F and DT S will be adapted to values suiting
drainback systems:
DT O = 10 K
DT F = 4 K
DT S = 15 K
Additionally, the adjustment range and the factory setting of the collector
emergency shutdown CEM will change:
Adjustment range: 80 … 120 °C; Factory setting: 95 °C
Adjustments previously made in these channels will be overridden and
have to be entered again if the drainback option is deactivated later on.
Note:
If the holiday function is activated, the drainback option will not be avail-
able.
Booster function
This function is used for switching on a second pump when lling the solar system.
When solar loading starts, R3 is energised in parallel to R1. After the lling time
has elapsed, R2 switches off.
Note:
The booster function is available in systems 1, 2, 3, 8, 9 and 10 only.
Note:
The overrun function is only available, if both Grundfos Direct Sensors
TM
(VFS and RPS) are used.
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(1,2) F.
OOVRU
Overrun option
Selection: ON / OFF
Factory setting: OFF
DTOVR
∆T overrun difference
Adjustment range:
0.0 … 20.0 K
Factory setting: 5.0 K
6
7
OBST
Booster function
Selection: ON / OFF
Factory setting: OFF
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