Hilti DD AF-CA, Original Operating Instructions

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22 English 2077904
*2077904*
When through holes are drilled without use of a depth gauge, the core bit feed movement continues
until the core bit projects approx. 3 cm out of the exit hole.
At the end of the drilling operation, the core bit retracts until it is just inside the hole and the water flow is
switched off.
6.3 Drilling with CUT ASSIST
WARNING
Risk of injury! The rotating hand wheel can cause injuries.
▶
Remove the hand wheel from the carriage before starting to drill with CUT ASSIST.
When CUT ASSIST mode is active and you press the Iron Boost button in the diamond core drilling
machine, automatic power adaptation when reinforcement is contacted is switched off. As a result,
until the end of the drilling operation, you will then have to regulate drilling power manually when
drilling through reinforcing bars.
1. Activate the water flow by pressing the Manual mode button.
➥ Water issues at the core bit.
2. Activate the CUT ASSIST mode.
3. Use the CUT ASSIST button to adjust power, if necessary.
4. Start the drilling operation as described in the applicable operating instructions for the diamond core
drilling machine.
6.4 Drilling in manual mode
1. Press the Manual mode button.
➥ Water flow is activated and cooling water issues at the core bit.
2. Carry out by the drilling operation as described in the operating instructions for the diamond core drilling
machine.
6.5 Breaks between work and storage at low temperatures
At temperatures below 4 °C (39 °F), the water in the cooling circuit has to be blown out with compressed air
when drilling is interrupted for more than one hour and before the equipment is stowed away.
In order for the water circuit to be drained, the diamond core drilling machine has to be connected to
the electricity supply and to the drilling feed unit.
1. Disconnect the water supply from the drilling feed unit.
2. Open the water flow regulator on the diamond core drilling machine.
3. Set the 3-way valve to
Wet drilling .
4. Press the Manual mode button.
5. Use compressed air (max. 3 bar) to blow the water out of the water circuit.
6.6 Removing the drilling feed unit 4
The drilling feed unit can be removed independently of the diamond core drilling machine.
1. Unplug the connecting cable for the drilling feed unit from the socket of the diamond core drilling
machine.
2. Fit the protective caps to the connecting cable and the socket.
3. Disconnect the water hose running to the diamond core drilling machine.
4. Lock the carriage with the carriage lock.
5. Secure the drilling feed unit so that it cannot accidentally drop; slacken the securing screw.
6. Remove the drilling feed unit.
Printed: 06.02.2019 | Doc-Nr: PUB / 5209129 / 000 / 06