PART II: INSTALLATION
17
- Connect the reference gas pipe (
TP
in figure; 8mm-external size pipe supplied loose), to the gas pressure nipples placed on the gas
pipe, downstream the gas valves: gas pressure must be measured at a distance that must be at least 5 times the pipe size.
- Leave the blowhole free (
SA
in figure). Should the spring fitted not permit satisfactory regulation, ask one of our service centres for a
suitable replacement.
version with SKP2 (built-in pressure stabilizer)
Caution: the SKP2 diaphragm D must be vertical
WARNING: removing the four screws BS causes the device to be unserviceable!
SA
SA
TP
D
= BS
SKP1.
SKP2.
*
*
*
*
*
*
*
*
*
SIEMENS VGD..
Mounting positions
TP
Siemens VGD... con SKPx
Example of gas train
Gas filter
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
Siemens VGD valves with SKP actuator:
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 fol-
lows:
- Remove the cap (T)
- Unscrew the adjusting screw (VR) with a screwdriver
- Replace the spring
Stick the adhesive label for spring identification on the type plate.
Summary of Contents for G225X
Page 41: ...Service manual AZL2x LMV2x 3x Burner Management System M12916CD Rev 3 4 03 2023...
Page 48: ...8 Parameters level heating engineer...
Page 90: ...50 ERROR CODE TABLE...
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