PART I: INSTALLATION
17
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.
To install the DUNGS VPS504 gas proving system on the MD-DLE valves group, proceed as follows:
1
turn off gas supply.;
2
Switch off power supply.
3
remove the Multibloc’s screw plugs (Fig. 11-A);
4
iInsert sealing rings (10,5 x 2,25) into VPS 504 (Fig. 12-B, Fig. 11-B)
5
Torque screws 3, 4, 5, 6 (M4 x16) Fig. 11-C
Only use screws with metric thread on reassembly (modification, repair).
6
On completion of work, perform a leak and functional test.
When wishing to monitor the test, install a pressure gauge ranged to that of the pressure supply point
PA
(Fig. 12). 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
.
Gas Train Reversal
The gas train can be fit either on the left and on the right. Follow these instruction..
1
Remove the plastic hook
G
to release the rod
T
(Fig. 13) .
2
Take the screws
V1
,
V2
,
V3
,
V4
,
V5
,
VT1
and
VT2
off (Fig. 13).
3
Take the ignition cable
CA
off of the transformer .
4
Disconnect the connector
CR
from the printed cirduit (Fig. 14).
5
Take off the flange and the combustion head together (Fig. 16).
Fig. 11
Fig. 12
A
B
LC
LB
PA
C
