Hilti DD 350-CA Manual De Instrucciones página 40

4. Press the "On" button on the PRCD (ground fault
circuit interrupter).
The test LED on the PRCD must light.
If the test LED on the PRCD lights, the core drilling
machine may be used.
6.3 Starting a hole using the hole-starting function
NOTE
en
Pay attention to the information in this section in ad-
dition to the information about the various core drilling
applications.
Strong vibration may occur when starting a hole. Use the
hole-starting function if strong vibration is experienced.
1. Press the "On" switch on the core drilling machine.
2. Press the "On" switch a second time.
The core bit then rotates very slowly (approx.
21/min).
3. Press the core bit firmly against the working surface.
4. After a short hole-starting phase (approx. 5 s), press
the "On" switch again.
The core bit will then rotate at normal speed.
5. Continue the drilling operation in accordance with
the instructions given in the subsequent sections.
6.4 Procedure when rebars are contacted
NOTE
If the rate of drilling progress becomes slower, this may
indicate that a rebar has been contacted. On contact with
rebars, the following procedure is recommended:
1. Press the rebar ("Iron Boost") button.
2. Press the rebar button once more when the rate of
drilling progress again increases, indicating that the
core bit is again drilling through concrete. The Iron
Boost function is then deactivated.
NOTE Use the Iron Boost function only when drilling
in heavily reinforced concrete. To avoid shortening
core bit life unnecessarily, switch the Iron Boost
function off again each time after drilling through
rebars.
6.5 Various applications
In this section, the following types of application are
described:
Wet drilling without use of a water collection system
Wet drilling using a water collection system and wet-type
vacuum cleaner
Dry drilling
6.5.1 Wet drilling without use of a water collection
system 14
6.5.1.1 Starting the hole
1. Switch on the water supply.
2. Open the water flow regulator slowly until the desired
water flow rate out of the core bit is achieved.
3. Make sure that the core bit is not in contact with the
working surface.
32
All manuals and user guides at all-guides.com
4.
5.
6.
7.
8.
6.5.2 Wet drilling using a water collection system
NOTE
Wet-type vacuum cleaners are available as accessories.
CAUTION
Make sure that the core bit is centered within the
water collector.
NOTE
Use of the water collection system is not possible when
drilling at an angle.
NOTE
The diamond core bit fills with water when drilling over-
head. After overhead drilling, first drain the remaining
water from the core bit.
NOTE
The vacuum cleaner must be switched on manually be-
fore opening the water supply valve and switched off
again manually after closing the water supply valve.
NOTE
If the optional water flow indicator is not used, the water
flow when drilling overhead can be monitored only after
the core bit has filled with water.
The wet-type vacuum cleaner must be switched on.
Setting it to automatic mode is not permissible.
6.5.2.1 Starting the hole
1.
2.
3.
4.
5.
6.
7.
Press the "On" switch on the core drilling machine.
The core bit begins to rotate.
Release the carriage locking mechanism while hold-
ing the hand wheel securely.
Turn the hand wheel until the diamond core bit is in
contact with the work surface.
When starting the hole, apply only light pressure
until the diamond core bit has centered itself.
NOTE When the pressure applied is low, the drilling
performance indicator lights orange.
Increase the pressure applied to the core bit until
the drilling performance indicator lights green.
and wet-type vacuum cleaner 15
Switch on the water supply.
Open the water flow regulator slowly until the desired
water flow rate out of the core bit is achieved.
Make sure that the core bit is not in contact with the
working surface.
Press the "On" switch on the core drilling machine.
The core bit begins to rotate.
Release the carriage locking mechanism while hold-
ing the hand wheel securely.
Turn the hand wheel until the diamond core bit is in
contact with the work surface.
When starting the hole, apply only light pressure
until the diamond core bit has centered itself.
NOTE When the pressure applied is low, the drilling
performance indicator lights orange.