Tightness Test; Commissioning; Replacing The Actuator - Krom Schroder VAS Series Operating Instructions Manual

Tightness test

1 Close the gas solenoid valve.
 To be able to check the tightness, shut off the
downstream pipeline close to the valve.
3
5
0
7
9 Tightness OK: open the pipeline.
▷ Pipeline leaking: replace O-ring on flange, see
accessories, seal set for sizes 1 – 3. Then check
for tightness once again.
▷ Unit leaking: remove the unit and return it to the
manufacturer.

Commissioning

Setting the flow rate
▷ At the factory, the gas solenoid valve is adjusted
for maximum flow rate Q.
▷ The markings on the cover cap can be used for
coarse adjustment of the flow rate.
▷ The cover cap can be rotated without changing
the current flow rate.
▷ Allen key: 2.5 mm.
▷ Do not turn beyond the "max." setting.
Q [%]
100
0
min.
▷ The VAS remains tight even if the adjusting screw
is overturned.
4
0
6
Open the
solenoid
valve.
8
0
-
+
max.
min.
U
max.
Setting the start gas rate on VAS../L, VCS..L
▷ The start gas rate can be set by turning the
damping unit a maximum of 5 turns.
▷ There must be a period of 20 seconds between
switching the valve off and on again so that the
damping is fully effective.
▷ Loosen the M5 setscrew (2.5 mm hexagon
socket), but do not unscrew completely.
1
- +
3
Setting the damping speed
▷ The opening speed can be influenced by turning
the nozzle screw on the damping unit.
CAUTION
Attention! To avoid leakage, please observe the
following:
– If the nozzle screw is turned by more than 1 turn,
the damping unit will leak and will have to be
replaced.
▷ Turn the nozzle screw a maximum of ½ a turn in
the appropriate direction.

Replacing the actuator

▷ The actuator adapter set is enclosed with new
actuators.
VAS 1
▷ The seals of the actuator adapter set are covered with
a non-stick coating. No additional grease is required.
GB-6
2
Turn
clockwise
to the zero
setting/as far
as possible.
4
Screw the M5
setscrew back
in.
- +
VAS 2/3