GB-6
D
GB
F
NL
I
E
9
Once the seals have been replaced, follow the
reverse procedure to reassemble the unit.
0
Then check the unit for internal and external
tightness, see page 4 (Tightness test).
Accessories
Pressure switch for gas DG..VC
▷
The pressure switch for gas monitors the inlet
pressure p
u
, the outlet pressure p
d
and the in-
terspace pressure p
z
.
p
u
p
d
▷
When retrofitting the pressure switch for gas,
see enclosed operating instructions “Pressure
switches for gas DG..C”, section entitled “Mount-
ing the DG..C..1, DG..C..9 on valVario gas so-
lenoid valves”.
▷
The switching point is adjustable via hand wheel.
2
3
1
Adjusting range
(adjusting tolerance
= ± 15% of the
scale value)
Mean switching
differential at min.
and max. setting
[mbar]
["WC]
[mbar]
["WC]
DG 17VC
2 – 17
0.8 – 6.8 0.7 – 1.7 0.3 – 0.8
DG 40VC
5 – 40
2 – 16
1 – 2
0.4 – 1
DG 110VC 30 – 110
12 – 44
3 – 8
0.8 – 3.2
DG 300VC 100 – 300 40 – 120
6 – 15
2.4 – 8
▷
Deviation from the switching point during testing
pursuant to EN 1854 Gas pressure switches:
± 15%.
Seal set for sizes –
▷
When retrofitting accessories or a second val-
Vario control or when servicing, we recommend
replacing the seals.
C
A B
C
E
D
▷
Order No. for
size 1: Order No. 74921988,
size 2: Order No. 74921989.
▷
Scope of delivery:
A
1 x double block seal,
B
1 x retaining frame (the retaining frame is not
required for VAN),
C
2 x O-rings (flange),
D
2 x O-rings (pressure switch),
for pressure test point/screw plug:
E
2 x sealing rings (flat sealing), 2 x profiled
sealing rings.