Festo VNIA-01-ZR Série Instructions D'utilisation page 21

Valve terminal type MN2H... and JMN2H...
Please note
Closed or pressurised exhaust channels result in mal
function of the valves.
S Make sure that the pneumatic connection 12 of the
valve terminal is neither closed nor pressurised. It
serves as a common line for pilot ventilation and can
be vented in a common duct or equipped with a
silencer.
1
Connection 14
Supply of the pilot
control with external
auxiliary pilot air
2
Connection 12
Supply of the pilot
control
Festo VNIA−01/02−ZR.. 0403a English
2
1
21