Level for drainage of excess gas

1. Close the breathing circuit (shut-off closed/switch over valve in bail-out position), the bellows will now slowly move towards the Full position.
2. Make sure the visor needle on the bellows arm is within the marked circle on the angle guide (position 0, Full).

Bellows movement

1. Open the breathing circuit (shut-off valve open/switch-over valve in rebreathing position) and hold the bellows.
2. Move the bellows upwards to the Stop position.
3. Make sure the indicator needle on the bellows arm is within the marked circle on the angle guide (Stop).