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Drainback option
ODB:
Drainback option
Adjustment range: OFF / ON
Factory setting: OFF
Note:
When the drainback option ODB is activated,
the cooling functions OCC, OSYC and OSTC
as well as the antifreeze function OCF are not
available.
If OCC, OSYC, OSTC or OCF have already
been activated before, they will be deactivated
again as soon as ODB is activated. They will
remain deactivated, even if ODB is deactivated
later on.
Time period - switch-on conditions
tDTO:
Time period -
switch-on conditions
Adjustment range: 1 ... 100 s
in steps of 1 s
Factory setting: 60 s
Filling time
tFLL:
Filling time
Adjustment range:
1.0 ... 30.0 min
in steps of 0.5 min
Factory setting: 5.0 min
Stabilisation
tSTB:
Stabilisation
Adjustment range:
1.0 ... 15.0 min
in steps of 0.5 min
Factory setting: 2.0 min
All manuals and user guides at all-guides.com
Note:
A drainback system layout requires additional
components such as a holding tank. The
drainback option should only be activated if all
components required are properly installed.
A drainback system permits the heat transfer fluid to drain
back into the holding tank when solar energy is not coll-
ected. The drainback option will initiate the filling of the
system when solar loading begins.
If the drainback option ODB is activated, the pump will
operate at 100 % speed for the adjusted filling time tFLL
in order to fill the system with fluid from the holding tank.
After tFLL, pump speed will go down to the adjusted
minimum pump speed nMn. The switch-off conditions will
then be ignored for the stabilisation time tSTB in order to
avoid the system from shutting down prematurely.
If the function is activated, the menu items described in the
following (tDTO, tFLL and tSTB) have to be adjusted:
Note:
When the drainback option ODB is activated,
the temperature differences DT O, DT F and
DT S as well as the minimum speed value nMN
are set to a fixed adjustment. Additionally, the
adjustment range and the factory setting of the
collector emergency shutdown temperature
EM changes (see the corresponding channel
descriptions for further information).
Previous adjustments made in these channels will
be overridden and have to be entered again if
ODB is deactivated later on.
The parameter tDTO is used for adjusting the time period
during which the switch-on condition DT O must be per-
manentely fulfilled.
The filling time can be adjusted using the parameter tFLL.
During this period, the pump runs at 100 % speed.
The parameter tSTB is used for adjusting the time period
during which the switch-off condition DT F will be ignored
after the filling time has ended.
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