What are the main points for the first installation of LPG dispenser?

First off all there should be azote test for the station pipes and installation. By this way you can fix the possible problems that can be caused from the dust,dirt and fin of welding.

Please see the Station Installation Diagram in Dispenser Specifications document for the following notes:

The pressure in the system should be 9-12 bars under normal conditions.You can check it with manometer. (3)
Safety relieve valve opens itsself automatically when the pressure is 17 bars and secure the pressure in the pipeline. (8)
By-Pass Valve aranges pressure which goes to Dispenser line. (15)
Pneumatic Valves should be open when there is no LPG transfer in the line and during filling of the Tank. If emergency stop button is pushed than both of them should be close.(16)
The solenid valve which is connected to filling line should be open during the fillling. (22)