Delfin D/G 1 Z22 Operating And Maintenance Manual page 30

5.1
Functional description of controls
1) Main switch O / 1
When the main switch is turned to " 1 " position, voltage feed is provided to the
vacuum. Feed is cut out when the main switch is turned to the "O" position
After turning the main switch to the "O" position it is possible to execute
maintenance operations inside the electrical control box.
2) Vacuum gauge (depression gauge)
The vacuum gauge indicates the depression values in mmH O (waterlift)
2
inside the filtering chamber. The vacuum perfectly works within values in a
range between 2500 -+ 3000 mmH O.
2
D/G 1 – D/G 2 Z22 Edition: September 2005 – Rel. 00