PART II: INSTALLATION
24
Siemens VGD20.. e VGD40..
Siemens VGD20.. and VGD40.. gas valves - with SKP2.. (pressure governor)
- 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.
Gas valveversion with SKP2 (built-in pressure stabilizer)
Gas Filter (if provided)
The gas filters remove the dust particles that are present in the gas, and prevent the elements at risk (e.g.: burner valves, counters and
regulators) from becoming rapidly blocked. The filter is normally installed upstream from all the control and on-off devices.
Caution: the SKP2 diaphragm D must be vertical (see Fig. 1).
WARNING: removing the four screws BS causes the device to be unserviceable!
ATTENTION: it is reccomended to install the filter with gas flow parallel to the floor in order to prevent dust fall on
the safety valve during maintenance operation.
BS
BS
SKP1.
SKP2.
BS
BS
SA
SA
TP
D
SIEMENS VGD..MOUNTING
POSITIONS
Fig. 17
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.
T
VR
Performance range (mbar)
0 - 22
15 - 120
100 - 250
Spring colour
neutral
yellow
red
To replace the spring supplied with the valve group, proceed as follows:
- 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 HRX92R-FGR
Page 46: ...PART III OPERATION 46 Fig 25...
Page 47: ...PART III OPERATION 47...
Page 61: ...Service manual AZL2x LMV2x 3x Burner Management System M12916CD Rev 3 4 03 2023...
Page 68: ...8 Parameters level heating engineer...
Page 110: ...50 ERROR CODE TABLE...
Page 111: ...51...
Page 112: ...52...
Page 113: ...53...
Page 114: ...54...
Page 115: ...55...
Page 116: ...56...
Page 117: ...57...
Page 118: ...58...
Page 119: ...59...
Page 120: ...60...
Page 121: ...61...
Page 122: ...62...
Page 123: ...63...
Page 124: ...64...
Page 129: ......
Page 130: ......
Page 131: ......