15
2)
fasten all the items by means of screws, according to the next diagrams, observing the mounting direction for each item.
NOTE:
the bellow joint, the manual valve and the gaskets are not part of the standard supply.
The procedures of installation fo the gas valves are showed in the next paragraph.
MULTIBLOC DUNGS MB-DLE 405..412
Mounting
1. Mount flange onto tube lines: use appropriate sealing agent (see Fig. 5);
2. insert MB-DLE: note position of O rings (see Fig. 5);
3. tighten screws A, B, C and D (Fig. 3 - Fig. 4), accordind to the mounting positions (Fig. 6);
4. after installation, perform leakage and functional test;
5. disassembly in reverse order.
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. 7-A);
4
iInsert sealing rings (10,5 x 2,25) into VPS 504 (Fig. 8-B, Fig. 7-B)
5
Torque screws 3, 4, 5, 6 (M4 x16) Fig. 7-C
Only use screws with metric thread on reassembly (modification, repair).
On completion of work, perform a leak and functional test.
ATTENTION:
once the gas train is mounted according to the diagram, the gas proving test mus be performed, according to
the procedure set by the laws in force.
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8
A
B
D
C
MOUNTING POSITIONS
A
B
LC
LB
PA
C
