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If this function is activated, the following control parameters are
available (tDTO, tFLL and tSTB):
ODB: Drainback function
Setting range: ON, OFF
Default setting: OFF
Note! If the drainback function ODB is activated, the cooling
functions OCC, OSYC and OSTC and the frost protection function
OKF are not available. If the OCC, OSYC, OSTC or OKF functions
have been activated, they are deactivated as soon as the ODB
function is activated. They then remain deactivated even if the
ODB function is deactivated later.
Note! Activating the drainback ODB function changes the tem-
perature differential values DT O, DT F and DT N and minimum
speed value nMN. The setting range and the default setting for
collector safety deactivation EM also change (for further infor-
mation, see the description of the corresponding parameter).
Previous settings made in this parameter are lost and must be
repeated if the ODB function is later deactivated.
19.27 Period – activation condition
tDTO: Period – activation condition
Setting range: 1 ... 100 s
Default setting: 60 s
Parameter tDTO can be used to set the period for which the acti-
vation condition DT O must be continuously satisfied.
19.28 Filling time
tFLL: Filling time
Setting range: 1.0 ... 30.0 min
Default setting: 5.0 min
Parameter tFLL lets you set filling time. The pump functions at
maximum speed throughout filling time.
19.29 Stabilisation
tSTB: Stabilisation
Setting range: 1,0 ... 15.0 min
Default setting: 2.0 min
Parameter tSTB can be used to set the period for which the de-
activation condition DT F is ignored when filling ends.
19.30 Booster function
OBST: Booster function
Setting range: ON, OFF
Default setting: OFF
This function activates a second pump when the solar system
is being charged. R2 is activated together with R1 when solar
charging begins. R2 is deactivated at the end of filling time (tFLL).
Note! The booster function is only available in system layout 1
(Arr = 1). The booster function is only available if the drainback
function is activated.
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