Hilti DD 150?U Operating Instructions Manual page 22

7. When beginning drilling, apply only light pressure
until the core bit has centered itself and then in-
crease the pressure. Drill to a depth of 3-5 mm to
form a guide kerf (optional operation).
8. Switch the machine off by releasing the on / off
switch and then wait until the core bit has stopped
rotating (optional operation).
9. Remove the hole-starting aid from the core bit (op-
tional operation).
10. Position the core bit in the guide kerf and then
press the on / off switch to continue drilling (optional
operation).
7.5 Hand-guided wet drilling with use of a water
collection system
WARNING
Water must not be allowed to run over the motor and
cover.
WARNING
A water collection system with wet-type vacuum
cleaner must be used when drilling in an upwards
direction.
NOTE
The optional operations are to be carried out when the
two-part hole starting aid is used.
NOTE
Start the wet-type vacuum cleaner manually before open-
ing the water supply valve and switch it off again manually
when the drilling operation is completed and after closing
the water supply valve.
NOTE
Do not use the power outlet on the vacuum cleaner.
1. If a water extraction system (vacuum cleaner) is
used, switch it on.
2. Secure the side handle in the desired position.
3. Fit the hole-starting aid (optional operation).
4. Insert the supply cord plug in the power outlet and
then press the "Reset" or "I" button on the GFCI.
5. Position the machine at the point where the hole is
to be drilled (hole center).
6. Slowly open the water flow regulator until the desired
volume of water is flowing.
The indicator on the side handle can be used to
check the water flow.
7. Press the on/off switch on the machine.
8. When beginning drilling, apply only light pressure
until the core bit has centered itself and then in-
crease the pressure. Drill to a depth of 3-5 mm to
form a guide kerf (optional operation).
9. Switch the machine off by releasing the on / off
switch and then wait until the core bit has stopped
rotating (optional operation).
10. Remove the hole-starting aid from the core bit (op-
tional operation).
11. Position the core bit in the guide kerf and then
press the on / off switch to continue drilling (optional
operation).
7.6 Wet drilling using the drill stand 24 25
WARNING
Water must not be allowed to run over the motor and
cover.
WARNING
A water collection system with wet-type vacuum
cleaner must be used when drilling in an upwards
direction.
en
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