BOOTDOC BD VAC IV Electric, Operating Manual

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4.2.2 Width adjustment:
Use the two rotary knobs to adjust the position of the
cushions to the customers individual hip width. Adjustment
is performed symmetrically from the center.
4.2.3 Closed loop speed control
Use this rotary controller to regulate the speed of the
vacuum build-up.
5. Maintenance
5.1 Cleaning

Make sure that you unplug the device before cleaning!

The outside of the device can easily be cleaned with a clean
cloth.

Never empty or spray cleaning agents into the device.
Cleaning of the technical components, if this is really required,
must be performed by qualified personnel.

Always clean and maintain the vacuum cushion with a silicone
spray after use.