Unigas HTLX92R Installation Manual page 21

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.
Caution: the SKP2 diaphragm D must be vertical
WARNING: removing the four screws BS causes the device to be unserviceable!
SKP1. SKP2.
SA
*
= BS
*
* *
* *
*
Siemens VGD... con SKPx Example of gas train
version with SKP2 (built-in pressure stabilizer)
T
Performance range (mbar)
Spring colour SKP 25.0
Spring colour SKP 25.4
*
SA
D
*
PGMAX
PGCP
PGMIN
Gas filter
VR
neutral yellow
0 ÷ 22 15 ÷ 120 100 ÷ 250
7 ÷ 700 150 ÷ 1500
TP
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
red
Stick the adhesive label for spring identification on the type plate.
21
PART II: INSTALLATION
SIEMENS VGD..
Mounting positions
TP