STIEBEL ELTRON SOM 9s - Manual (Page 84)

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SOM 9s
Time period - switch-on condition
LLOGI/ODB/tDTO
Time period - switch-on
condition
Adjustment range: 1 ... 100 s
in steps of 1 s
Factory setting: 60 s
The parameter tDTO is used for adjusting the time period
during which the switch-on condition DT O must be per-
manentely fulfilled.
Stabilization
LLOGI/ODB/tSTB
Stabilization
Adjustment range:
1.0 ... 15.0 min
in steps of 0.5 min
Factory setting: 2 min
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.
LLOGI/ODB/tFLL
Filling time
Adjustment range:
1.0 ... 30.0 min
in steps of 0.5 min
Factory setting: 5.0 min
The filling time can be adjusted using the parameter tFLL.
During this period, the pump runs at 100 % speed.
Filling time
By means of this function, tank loading continues after the
temperature difference between the collector and the tank
has fallen below the switch-off difference. Tank loading is
stopped if the adjusted DT overrun difference between flow
and return sensor is underrun.
LLOGI/OOVRU
Selection: ON / OFF
Factory setting: OFF
Overrun
Booster function
LLOGI/ODB/OBST
Booster function
Adjustment range: ON / OFF
Factory setting: OFF
This function is used for switching on a second pump when
filling the solar system. When solar loading starts, R3/R4 is
energized in parallel to R1. After the filling time (tFLL) has
ended, R2 is switched off.
note:
The booster function is available in systems 1, 3,
8, 9, and 10 only.
Drainback option
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 function is activated,
the menu items described in the following (tDTO, tFLL
and tSTB) have to be adjusted:
note:
The drainback option is only available in system
with one tank and one collector field and if no
cooling function is activated.
LLOGI / ODB
Drainback option
Selection: ON / OFF
Factory setting: OFF
note:
A drainback system requires additional com-
ponents such as a holding tank. The drainback
option should only be activated if all components
required are properly installed.
note:
If the drainback option ODB is activated, the
cooling functions and the antifreeze function will
not be available.
note:
If the drainback option ODB is activated, the
factory settings of the parameters DT O,
DT F and DT S will be adapted to values suiting
drainback systems. Additionally, the adjustment
range and the factory setting of the collector
emergency shutdown CeM will change.
Previous adjustments made in these channels
will be overridden and have to be entered again
if ODB is deactivated later on.