▶
Fill water to the top marking of the test funnel.
▷
When the pressure switch is intact, the control will report a back
flow:
Display: [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.
▶
Set the emergency lock to
"
AUF
"
(ON) position.
▷
The water drains away.
Display: [Test NRV closed]
▶
Open the motor-powered flap by pressing button T2.
▶
Remove the test funnel.
▶
Screw in the brass plug.
▷
The control automatically changes back to normal operation
after a successful procedure.
Display: [Normal operation / NRV opened]
Handling
Grundfix Plus Control backflow trap type 3
24