Honeywell Krom Schroeder VAN Series, Руководство по эксплуатации, Страница: 5 / 8

VAN · Edition 05.22
EN-5
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 6
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
tightening
torque
[ncm]
VAx 1: M5 500 ± 50
VAx 2: M6 800 ± 50
VAx 3: M8 1400 ± 100
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
u
and the outlet pressure p
d
.
➔
Monitoring the inlet pressure p
u
: the pressure
switch for gas is mounted on the inlet side.
Monitoring the outlet pressure p
d
: the pressure
switch for gas is mounted on the outlet side.
p
u
p
d
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
enclosed operating instructions “Pressure switch-
es for gas DG..C”, section entitled “Mounting the
DG..C.. on valVario gas solenoid valves”.
➔
The switching point is adjustable via hand wheel.
1 2 3
type
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%.