PART I: INSTALLATION MANUAL
20
Mounting VD-R & PS-...
Siemens VGD20.. e VGD40..
Siemens VGD20.. and VGD40.. gas valves - with SKP2.. (pressure governor)
- Connect the reference gas pipe (
TP
in figure; 8mm-external size pipe supplied loose), to the gas pressure nipples placed on the gas
pipe, downstream the gas valves: gas pressure must be measured at a distance that must be at least 5 times the pipe size.
- Leave the blowhole free (
SA
in figure). Should the spring fitted not permit satisfactory regulation, ask one of our service centres for a
suitable replacement.
1. Gas pressure regulation is possible with VD-R and PS pressure sensor only.
WARNING! For US/CN installation, the output pressure must be monitoried by min. and max. pressure switches set
to +/- 20% of the setpoint.
2. Mounting on pipe. Sensor position: 5x DN according to MBE. Pipe fitting with female thread size ¼, mount sensor with
seal, observe torque.
3. The pressure sensor includes a vent limiter according to UL 353 and ANSI Z21.18/CSA 6.3. No venting required in loca-
tions where vent limiters are accepted by the jurisdiction.
4. Only PS pressure sensors specified by DUNGS are authorised to be connected to the VD-R‘s M12 interface.
5. Only PS cables specified by DUNGS are authorised to be used to connect the PS to the VD-R. Max. cable length 3 m.
ATTENTION:
once the gas train is mounted according to the diagram on Fig. 4, the gas proving test mus be performed,
according to the procedure set by the laws in force.
Caution: the SKP2 diaphragm D must be vertical
WARNING: removing the four screws BS causes the device to be unserviceable!
Actuator
VD-R
The actuator
VD-V
does not need any adjustment (funzione ON-OFF)
The actuator
VD-R
It must be combined with the
PS
sensor (include
regolatore di pressione)
Actuator
VD-V
M12 x 5 Pin
VD-R + PS