Unigas G335A Installation Manual page 18

PART II: INSTALLATION
MultiBloc MBE
Example of gas train MBE
GAS BRUCIATORE ø185
PS
PS pressure sensor
ATTENTION: once the gas train is mounted according, the gas proving test mus be performed, according to the
procedure set by the laws in force.
ATTENTION: it is recommended to mount filter and gas valves to avoid that extraneous material drops inside the
valves, during maintenance and cleaning operation of the filters (both the filters outside the valves group and the
ones built-in the gas valves).
WARNING: Slowly open the fuel cock to avoid breaking the pressure regulator.
Threaded train with MultiBloc MBE - Mounting
Attention: In the case of the MBE... valve, a pressure limit switch downstream of the safety valve is mandatory.
Mounting VD-R & PS-...
ActuatorVD-R
VD-R + PS
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.
ActuatorVD-V
M12 x 5
VD-R
S
VD-V
Gas filter
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)
The PS sensor chosen based on the necessary pressure (there are

3 models)
18
VD-V
EV2
EV2
PGMAX
PGMAX
PGCP
501939
VD-R
EV1
EV1
PGMI
PGMIN
PGCP