Viega Grundfix Plus-Control Manual page 73

Grundfix Plus-Control – Modell 4987.41
As well as cleaning all components, the casing and the lid, the maintenance procedure includes the subsequent pressure test by
simulating a backflow in accordance with DIN EN 13564.
In the cover of the Grundfix Plus-Control, there is a pressure switch, which gives the signal to close the motor-driven flap when
achieving a defined backpressure in the wastewater pipe of the control unit.
During cleaning work, the cover must not be cleaned with a high-pressure cleaner, abrasive cleaning agents, blades or similar
cleaning equipment. In addition, housing, valve mechanism and seals should only be cleaned with a soft brush under running
water to avoid damage to the seals and seal surfaces.
The buttons should only be pressed if the cover is firmly screwed to the Grundfix Plus-Control.
Notes – Maintenance works are not possible during battery operation as the power loss is too great.
– Only begin work when you have ensured that there is no backflow situation and the drainage fittings in
front of the Grundfix Plus-Control are not being used.
G
Maintenance work steps
Work steps – System in "Normal Operation" (Norm. operation, see Chapter H)
– Select the »Wartung« (Maintenance)
menu with T1.
– Activate »Wartung« (Maintenance) with T3.
– Close the valve with T2.
– Set the emergency closing device to
position "Zu" (Closed).
 Clean the spindle on the lower side of
the cover
Do not grease the spindle!
 Clean casing.
 »Klappe öffnen« (Open flap) with T2.
– Screw in the test funnel.
– Set the emergency closing device to
position "AUF" (Open), the water drains
away.
Display: »Test RV - geschlossen«
(Test NRV closed)
– Open with T2 flap.
– Remove test funnel.
– Screw-in plugs.
After successful completion of the maintenance work, »Wartung / Korrekt durchgeführt« (Maintenance / correctly performed) will
appear on the display and the control unit switches back to normal "Normalbetrieb" (Norm. operation) after 60
seconds. Alternatively, normal operation can be activated using buttons T1 and T3.
 Loosen the cover screws.
 Carefully clean the opening
for the pressure switch on the
lower side of the cover with a
small brush.
 Fit motor-driven flap and emer-
gency closing device flap. The
seals of the internal walls must be
greased with silicone grease on
the casing side before installation.
– Open and close the emergency
flap by hand - check functionality
– Set the emergency closing
device to position »ZU« (Closed).
– Close valve with T2, »Klappe
schliessen« (Close flap), motor-
driven flap and emergency
closing valve are now closed.
– Fill water to the top marking of the test funnel.
– When the pressure switch is intact, the control unit will report a backflow:
Display: »Wartung Rückstau«, (Back pressure maintenace)
Keep the water level in the test funnel constant for 10 minutes by replenishing.
If the loss is greater than 0.5 litres, the seals of the cover valves must be checked
and replaced if necessary.
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 Carefully remove the cover.
 – Remove and clean motor-driven flap
and emergency closing device valve.
– Check seals and replace if needed.
 – Replace cover and screw on.
 – Unscrew the brass plugs from the cover.
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