PART III: OPERATION
41
Gas valve Siemens VGD - Version with SKP2.
(Built-in pressure stabilizer)
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.
REGULATION:
Multibloc MB-DLE
The multibloc unit is a compact unit consisting of two valves, gas pressure switch, pres-
sure 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
closes. 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 incre-
ases 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.
Fig. 5
Fig. 6
Key
1 Electrical connection for valves
2 Operation display (optional)
3 Pressure governor closing tap
4 Start setting cap
5 Hydraulic brake and rate regulator
6 Coil
7 Test point connection G 1/8
8 Test point connection G 1/8 downstream of valve 1, on both sides
9
Output flange
10 Test point connection M4 downstream of valve 2
11 Gas flow direction
12 Test connection G 1/8 downstream of valve 1, on both sides
13 Vent nozzle pressure regulator
14 Filter (below cover)
15 Input flange
17 Pressure switch
18 Pressure switch electric connection
C
VS T(VR)
RP
VB
VSB
Fig. 4
T
VR
+
-
Summary of Contents for G335A
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Page 57: ...Service manual AZL2x LMV2x 3x Burner Management System M12916CD Rev 3 4 03 2023...
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