▶
Set the emergency lock in
"
ZU
"
(OFF) position.
▶
Close the motor-powered flap by pressing the button T2.
▷
The motor-powered flap and the emergency lock flap are
closed.
▶
Unscrew the brass plug from the lid.
▶
Screw in the test funnel.
▶
Fill water to the top marking of the test funnel.
▷
When the pressure switch is intact, the control will report a back
flow:
Display indication [Test NRV closed] , [Back pressure NRV
closed]
If necessary, a positive opening is possible. Press the button T3
for 5 seconds.
▶
Keep the water level in the test funnel constant for 10 minutes by
replenishing. Observe loss.
▷
If the loss is greater than 0.5 l, check and, if required, replace
the seals on the flaps.
Handling
Grundfix Plus Control backflow trap type 3
38