Shut down of suction for water holes functionality is used to cut off the dust collector suction when drilling through wet layer.
When drilling through wet layer, dust collector sucks water into filter elements very easily. Water and dust forms cement-like layer to the filters which is difficult to clean and which prevents correct operation of filters.
This can be avoided by switching off the suction immediately when water is noticed with the suction shut-down system. The suction is switched off by closing the suction flap valve of the dust collector. The flap valve is operated by a cylinder and the control lever is located at the control panel or at radio remote.