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d
10 Position new actuator.
11 Follow the reverse procedure when reassembling.
12 Fit the M20 cable gland or plug and socket.
13 Connect the VAN to the electrical power supply,
see page 2 (4 Wiring).
7 MAIntenAnCe
CAUtIon
In order to ensure smooth operation, check the
tightness and function of the unit:
– Once per year, twice per year in the case of
biogas; check for internal and external
tightness, see page 4 (5 Tightness test).
– Check electrical installations once a year in line
with local regulations; pay particular attention to
the PE wire, see page 2 (4 Wiring).
➔ If the flow rate has dropped, clean the strainer.
➔ We recommend replacing the seals, see accesso-
ries, page 6 (8.2 Seal set VA 1–2).
1 Disconnect the system from the electrical power
supply.
2 Shut off the gas supply.
3 Undo connection parts.
4
5
7
8
9 Once the seals have been replaced, follow the
reverse procedure to reassemble the unit. Note
the recommended tightening torques for the con-
nection parts.
Connection parts
VAx 1: M5
VAx 2: M6
VAx 3: M8
10 Then check the unit for internal and external tight-
ness, see page 4 (5 Tightness test).
8 ACCessoRIes
8.1 Pressure switch for gas DG..VC
The pressure switch for gas monitors the inlet pres-
sure p
➔ Monitoring the inlet pressure p
Scope of delivery:
1 x pressure switch for gas,
2 x self-tapping retaining screws,
2 x sealing rings.
Also available with gold-plated contacts for voltages
of 5 to 250 V.
➔ When retrofitting the pressure switch for gas, see
➔ The switching point is adjustable via hand wheel.
1
type
6
DG 17VC
DG 40VC
DG 110VC 30–110
DG 300VC
➔ Deviation from the switching point during testing
tightening
torque
[ncm]
500 ± 50
800 ± 50
1400 ± 100
EN-5
and the outlet pressure p
u
switch for gas is mounted on the inlet side.
Monitoring the outlet pressure p
switch for gas is mounted on the outlet side.
p
u
enclosed operating instructions "Pressure switch-
es for gas DG..C", section entitled "Mounting the
DG..C.. on valVario gas solenoid valves".
2
Adjusting range
(adjusting
tolerance =
± 15% of the
scale value)
[mbar]
["WC]
2–17
0.8–6.8 0.7–1.7 0.3–0.8
5–40
2–16
12–44
100–
40–120
300
pursuant to EN 1854 Gas pressure switches:
± 15%.
.
d
: the pressure
u
: the pressure
d
p
d
3
Mean switching
differential at
min. and max.
setting
[mbar]
["WC]
1–2
0.4–1
3–8
0.8–3.2
6–15
2.4–8
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