Hilti DD VP-U Manual page 14

4.2 Noise information (in accordance with EN ISO 2151)
Typical A-weighted sound pressure level
5 Before use
5.1 Setting up vacuum pump
WARNING
A damaged supply cord presents a hazard! Do not touch the supply cord or extension cord if damaged
while working. Disconnect the supply cord plug from the power outlet.
▶ If the power tool's supply cord is damaged it must be replaced with a specially-prepared and approved
supply cord available from Hilti Customer Service.
1. Find a suitable location with the following characteristics:
▶ Supporting surface is smooth and dry.
▶ Cooling air inlet and cooling air outlet have at least 20 cm clearance from walls and other obstructions.
2. Secure the vacuum pump against slippage.
3. Check the water level in the water separator and empty it if necessary.
4. Connect the vacuum connector on the vacuum base plate to the vacuum pump.
6 Operation
6.1 Switching on vacuum pump
1. Plug the supply cord into the power outlet.
2. Press the on / off switch.
▶ The vacuum pump starts.
6.2 Checking vacuum
Check operation of the vacuum pump and check the vacuum after maintenance work and before
every use.
1. Plug the supply cord into the power outlet.
2. Switch on the vacuum pump. → page 10
▶ Within a short time, the needle of the pressure gauge is in the green part of the scale.
6.3 Observing pressure gage
The pressure gage shows the current partial vacuum created by the vacuum pump.
• Pressure gage in green zone → partial vacuum is adequate
• Pressure gage in red zone → partial vacuum is too low
▶ Observe the pressure gages on the vacuum pump and vacuum base plate while drilling is in progress.
▶ The pressure gage must remain constantly in the green zone throughout the drilling operation.
▶ If the pressure gage drops to the red zone, interrupt the drilling operation and switch the drilling system
off. Secure the drilling system so that nothing can fall!
▶ At regular intervals, check the vacuum hoses for leaks, kinks or other damage.
▶ Have faulty parts repaired or replaced by Hilti Service.
6.4 Observing fill level of water separator
The water separator has a safety valve that mechanically shuts off the intake aperture if the fill level is
too high. This prevents the vacuum pump from intaking water and suffering damage.
10 English
< 70 dB(A)
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