Hilti DD AF-CA Operating Instructions Manual page 16

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
button.
5. Use compressed air (max. 3 bar) to blow the water out of the water circuit.
6.6 Removing the drilling feed unit
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.
7 Care, transport and storage
7.1 Care and maintenance
WARNING
Electric shock hazard! Attempting care and maintenance with the supply cord connected to a power outlet
can lead to severe injury and burns.
▶ Always unplug the supply cord before carrying out care and maintenance tasks.
Care
• Carefully remove any dirt that may be adhering to parts.
• Clean the air vents carefully with a dry brush.
• Use only a slightly damp cloth to clean the casing. Do not use cleaning agents containing silicone as
these may attack the plastic parts.
12 English
Printed: 22.05.2019 | Doc-Nr: PUB / 5236039 / 000 / 03