GB-12
D
GB
F
NL
I
E
Bypass/pilot gas valves
1
Disconnect the system from the electrical power
supply.
Shut off the gas supply.
3
Prepare the installed main valve.
▷
Turn the actuator so that the side on which the
bypass/pilot gas valve is to be installed is ac-
cessible.
6
5
4
VBY for VAx 1
Scope of delivery
B
C
A
VBY 8
VAx 1
Rp ¼
(Zündgasventil)
Bypass valve VBY..I
A
1 x bypass valve VBY..I
B
2 x retaining screws with 4 x O-rings: both retain-
ing screws have a bypass orifice
C
Grease for O-rings
▷
The screw plug at the outlet remains in place.
Pilot gas valve VBY..R
A
1 x pilot gas valve VBY..R
B
2 x retaining screws with 5 x O-rings: one retain-
ing screw has a bypass orifice (2 x O-rings), the
other does not (3 x O-rings)
C
Grease for O-rings
▷
Remove the screw plug at the outlet and connect
the Rp ¼ pilot gas line.
Mounting the VBY
7
Grease O-rings
B
.
VBY..I
VBY..R
8
9
10
11
▷
Tighten the retaining screws alternately so that
VBY and the main valve are flush.
Setting the flow rate
▷
The flow rate can be set by turning the flow rate
restrictor (4 mm hexagon socket) ¼ of a turn.
+
-
▷
Only adjust the flow rate restrictor in the marked
range, otherwise the required gas volume will
not be reached.
1
Wire the socket, see page 6 (Wiring).
13
Check for tightness, see page 13 (Checking
the bypass/pilot gas valve for tightness).
VAS 1 for VAx 1, VAx , VAx 3
Scope of delivery
A
B
C
VAx 1
VAx 2/3
D
F
E
C
A
1 x bypass/pilot gas valve VAS 1
B
4 x O-rings
C
4 x double nuts for mounting to VAS 1
or
4 x spacer sleeves for mounting to VAS 2/3
D
4 x connection parts
E
1 x mounting aid
Bypass valve VAS 1
F
2 x connection pipes, if the bypass valve has a blind
flange on the outlet side.
Pilot gas valve VAS 1
F
1 x connection pipe, 1 x sealing plug, if the pilot gas
valve has a threaded flange on the outlet side.
