Display
Meaning
[Positive opening]
Forced opening of the motor-powered flap in case of
backflow
[NRV closes]
Motor-powered flap has been closed because the
battery power is less than 11.8 V in battery operation
[Cut-off of rechargeable battery]
Shut-down because the battery power is less than
10.5 V in battery operation
3.4.3
Operating condition – back pressure
In case of a backflow, the motor-powered flap closes.
Display: [Back pressure NRV closed] with signal every 10 seconds.
If the backflow ends, the motor-powered flap opens and the control unit
switches back to [Normal operation] .
During the backflow, the buttons have the following functions:
Function
Button
Switch off signal
Call up [Sound off] with T1 button
and confirm with T3 button
Forces motor-powered flap to
open
Keep T3 button pressed for five
seconds
Display: [Positive opening NRV
opened"]
If the backflow sensor is defective, the motor-powered flap will remain
closed even after the backflow situation has ended. In this case, the
motor-powered flap must be forced opened.
The control goes to [Back pressure] , if the backflow still exists. If no
backflow exists, the control reverts to [Normal operation] .
3.4.4
Operating condition – malfunction
Mechanical faults or errors around the control are shown on the display
and an acoustic alarm sounds.
During an error, the following functions can be carried out:
Handling
Grundfix Plus Control backflow trap type 3
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