Operation - Hilti DD EC-1 Mode D'emploi

when the DD-REC1 water recycling unit is used. The cor-
responding information must be observed.
Assembling
Assembling the tool
– Take the tool out of the toolbox.
– Slide the water collector rods into the openings pro-
vided on the front side of the tool as far as they will
go .
– As you do so, keep button
the water collector in position on the gear housing by
releasing the button when the rods have been fully
inserted .
– Slide the button to the right to adjust the water col-
lector to the length corresponding to the core bit used
(position 1: 6" working length; position 2: 6"–12"
working length)
– Always use the supplied water collector system.
– Always ensure that the diameter of the water collec-
tor ring used corresponds to the nominal diameter of
the core bit used.
– Always screw the side handle and depth gauge into
one of the threaded bushings provided on the gear
housing .
Inserting the core bit
-DANGER-
Do not use damaged core bits. Check the core bits for
chipping, cracks, or heavy wear each time before use.
Do not use damaged tools. Fragments of the workpie-
ce or a broken core bit may be ejected and cause injury
beyond the immediate area of operation.
-NOTE-
Diamond core bits must be replaced when the cutting
performance and/or rate of drilling progress drops sig-
nificantly. This generally is the case when the segments
reach a height of less than 2 mm.
– Open the chuck by lifting the operating lever
upwards .
– Check that the core bit connection end and the chuck
are clean and undamaged.
– Check that the slots in the cutting edge of the
core bit to be used still have a depth of at least
"). If not, the core bit should be replaced
0.5 mm ( 1 /
16
as there is otherwise a risk of it becoming stuck in the
hole .
– Pivot the water collector about its mounting axis as
far as it will go.
– From above, insert the cutting edge of the core bit
into the water collector ring
– Guide the connection end of the core bit into the open-
ing in the chuck.
– Rotate the core bit in a clockwise direction while press-
ing it into the chuck as far as it will go
– Return the chuck operating lever
position.
6
depressed and engage
.
.
.
to its original
– Ensure that the core bit is securely engaged
in the chuck.
Connecting the supply cord and the water supply hose
Check that the detachable electric plug con-
nector is clean and dry before it is connected
to thetool. The power plug must be disconnected from
the power supply before cleaning the keyed socket on
the supply cord.
– Take the supply cord out of the toolbox
– Align the mark on the socket with the mark on the
plug on the underside of the tool
– While in this position, insert the plug into the socket
as far as it will go.
– Rotate the keyed socket in a clockwise direction, while
applying slight pressure, until it is heard to engage.
– Use a suitable coupling to connect the water supply
hose .
– Connect the supply cord to the power supply.
– Switch on the GFCI by pressing the black button
– Before operating the tool, check the GFCI safety func-
tion by pressing the test button. The test is OK when
the test LED extinguishes.
-DANGER-
If the indicator continues to light, further operation of
the machine ist not permissible. Have the machine repair -
ed by a qualified specialist using genuine Hilti spare parts.
– After the test, switch on the GFCI again by pressing
the ON button.
Switching off after use
1. Disconnect the mains plug.
2. Release the hose connectors to the diamond core
drilling tool. When using the DD-REC1 hoses, connect
the extraction hose and water supply hose couplings
together. By use of external water supply, close the water
valve and always use a connector with a water-stop to
prevent water runs on the tool.
3. Release the keyed plug from the diamond core drilling
30°
machine. To do this, pull on the ring and turn the plug
in a counterclockwise direction, as far as it will go, and
then pull it out.

Operation

Drilling
The water flow can be controlled in one of two ways:
1. Automatic control (preferred)
When the flow control knob is in position 1, the water
supply is controlled (started and stopped) automatical-
ly by the control switch on the tool. The water flow rate
can be adjusted manually by turning the water flow con-
trol knob (minimum water flow rate: approx. 1 pint/min.).
.
.
.