en
21
InstallationIndications, functions and optionsMessages Commissioning Operation and function
SEN
Digital ow rate sensor (only if SEN = 12, 40 or 40F)
Selection: OFF, 1, 2
Factory setting: 2
Flow rate detection type:
OFF : xed ow rate value (owmeter)
1 : Grundfos Direct Sensor™ in the ow pipe
2 : Grundfos Direct Sensor™ in the return pipe
Sensor allocation for heat quantity measurement:
SEN = 1 SEN = 2 SEN = OFF
SFL SRET SFL SRET SFL SRET
GFD S4 S4 GFD S1 S4
MEDT
Heat transfer uid
Adjustment range: 0 … 3
Factory setting: 1
MED%
Antifreeze concentration
in Vol-% (MED% is not indicated when
MEDT 0 or 3 is used.)
Adjustment range: 20 … 70 %
Factory setting: 45 %
Heat transfer uid:
0 : Water
1 : Propylene glycol
2 : Ethylene glycol
3 : Tyfocor
®
LS / G-LS
Drainback option
Note
A drainback system requires additional components such as a holding
tank. The drainback option should only be activated if all components
required are properly installed.
In a drainback system the heat transfer uid will ow into a holding tank if solar
loading does not take place. The drainback option initiates the lling 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 option ODB is activated, the factory settings of the pa-
rameters 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.
To Next Page
Loading...
General