Unigas LAMTEC BT3 Series, Manual Of Installation - Use - Maintenance

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PART II: INSTALLATION
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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.
Once the train is installed, connect the gas valves group and pressure switches plugs.
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. 11
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.