Drainback option
Note:
A drainback system requires additional components such as a holding
tank. The drainback option should only be activated if all components re-
quired are properly installed.
In a drainback system the heat transfer fluid will flow into a holding tank if solar
loading does not take place. The drainback option initiates the filling process if solar
loading is about to start. If the drainback option is activated, the following adjust-
ment can be made.
ODB
Drainback option
Adjustment range: OFF / ON
Factory setting: OFF
Note:
If the drainback option is activated, the cooling functions and the antifreeze
function will not be available. If one or more than one of these functions
have 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.
Note:
If the drainback function ODB is activated, the factory settings of the
parameters nMN, 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 will change. Adjustments previously made in these
channels will be overridden and have to be entered again if the drainback
option is deactivated later on.
Time period – switch-on condition
tDTO
Time period – switch-on condition
Adjustment range: 1 … 100 s
Factory setting: 60 s
The parameter tDTO is used for adjusting the time period during which the
switch-on condition must be permanently fulfilled.
Filling time
tFLL
Filling time
Adjustment range: 1.0 … 30.0 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.
Stabilisation
tSTB
Stabilisation
Adjustment range: 1.0 … 15.0 min
Factory setting: 2.0 min
The parameter tSTB is used for adjusting the time period during which the switch-
off condition will be ignored after the filling time has ended.
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