PART II: INSTALLATION
25
Mounting VD-R & PS-...
Gas Proving System VPS504 (Option)
The VPS504 check the operation of the seal of the gas shut off valves. This check, carried out
as soon as the boiler thermostat gives a start signal to the burner, creates, by means of the
diaphragm pump inside it, a pressure in the test space of 20 mbar higher than the supply
pressure.
When wishing to monitor the test, install a pressure gauge ranged to that of the pressure sup-
ply point
PA
. If the test cycle is satisfactory, after a few seconds the consent light
LC
(yellow)
comes on. In the opposite case the lockout light
LB
(red) comes on. To restart it is necessary
to reset the appliance by pressing the illuminated pushbutton
LB
.
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.
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)
Actuator
VD-R
Actuator
VD-V
M12 x 5 Pin
VD-R + PS
LC
LB
PA