PART III: OPERATION
41
ADJUSTING THE GAS VALVES GROUP
Multibloc MB-DLE
MultiBloc MBE
Regulation VD-R whith PS
Siemens VGD../VRD.. version with SKP2
The pressure adjusting range, upstream the gas valves group, changes according to the spring provided with the valve group.
To replace the spring supplied with the valve group, proceed as follows:i
To increase or decrease gas pressure, and therefore gas flow rate, remove the cap
T
and use a screwdriver to adjust the regulating
screw
VR
. Turn clockwise to increase the flow rate, counterclockwise to reduce it.
The multibloc unit is a compact unit consisting of two valves, gas pressure switch, pressure
stabilizer and gas filter.
The valve is adjusted by means of the
RP
regulator after slackening the locking screw
VB
by
a number of turns. By unscrewing the regulator
RP
the valve opens, screwing the valve clo-
ses. To set the fast opening remove cover
T
, reverse it upside down and use it as a tool to
rotate screw
VR
. Clockwise rotation reduces start flow rate, anticlockwise rotation increases
it.
Do not use a screwdriver on the screw
VR
!
The pressure stabilizer is adjusted by operating the screw
VS
located under the cover
C
. By
screwing down the pressure is increased and by unscrewing it is reduced.
Note: the screw
VSB
must be removed only in case of replacemente of the coil.
Caution:
check that the range of the installed spring is compatible with the gas pressure at the burner head (see
appropriate diagram) to which must be added the back pressure and approx. 5 /10 mbar for various leaks and gas line.
While making outlet pressure adjustments, do not exceed a value that creates a hazardous condition to the bur-
ner!
C VS
T(
V
R
V
VSB
Outlet
pressure
MIN
10%
25%
50%
75%
MAX
PS-10/40
4 mbar
0,4 kPa
2 "w.c.
10 mbar
1,0 kPa
4 "w.c.
25 mbar
2,5 kPa
10 "w.c.
50 mbar
5,0 kPa
20 "w.c.
75 mbar
7,5 kPa
30 "w.c.
100 mbar
10,0 kPa
40 "w.c.
PS-50/200
20 mbar
2,0 kPa
8 "w.c.
50 mbar
5,0 kPa
20 "w.c.
125 mbar
12,5 kPa
50 "w.c.
250 mbar
25,0 kPa
100 "w.c.
375 mbar
37,5 kPa
150 "w.c.
500 mbar
50,0 kPa
200 "w.c.
T
VR
Performance range (mbar)
neutral
yellow
red
Spring colour SKP 25.0
0 ÷ 22
15 ÷ 120
100 ÷ 250
Spring colour SKP 25.4
7 ÷ 700
150 ÷ 1500
+
-
