Hilti DD EC-1 Mode D'emploi page 13

2. Bypass mode
When the water regulation wheel is pulled into position
2, the water flow rate can be adjusted manually between
0 GAL/min. and approx.
This operating mode is used for special applications.
– Before beginning drilling, adjust the flow control knob
to the middle position of its range.
– Carefully bring the water collector into contact with
the surface where the hole is to be drilled.
– The core bit can be exactly positioned by bringing
the centering marks on the water collector into align-
ment with a cross marked at the position where the
hole is to be drilled
– To begin drilling, press the control switch
the core bit has been brought into contact with the
base material.
– Begin drilling the hole only when the water flow indi-
cator shows that water is flowing through the core
bit .
– Press the core bit gently against the base material.
– Take care to ensure that the core bit is straight in the
hole (i.e., do not allow the core bit to bind against the
side of the hole).
The pressure applied to the core bit should be regu-
lated so that the tool continues to run at full RPM. Appli-
cation of higher pressure does not increase the rate of
drilling progress. Keep the tool straight on the hole.
– Immediately after beginning drilling, check the water
flow rate indicator to ensure that water is flowing
(water flow rate is within the optimum range when
the red and white segments of the rotating wheel
are still individually discernible).
Always keep an eye on the water flow rate indica-
tor while drilling. Insufficient water may cause the
core bit to stick in the hole. It may be necessary to adjust
the water flow rate manually by turning the flow control
knob .
– Switch off the tool after reaching the desired drilling
depth or when the hole has been drilled right through
and, at the same time, pull the core bit out of the
hole.
– When drilling in the bypass mode, bring the flow
control knob back to the zero position.
– The water collector should be lifted away from the
base material only when the core bit has stopped
rotating.
If the water collector is lifted away from the base
material while the core bit is still rotating, there is
a risk of injury as the core may be thrown out of the
bit.
Additional instructions for drilling using the DD-REC1
water recycling unit
– Read and observe the information printed in the
DD-REC1 operating instructions.
– When the water recycling unit is used, it must be
ensured that the DD-REC1 is in stand-by mode (turn
3 / GAL/min. by turning the knob.
4
.
the main switch). This mode is indicated by a green
LED (see DD-REC1 operating instructions).
– When in stand-by mode, the DD-REC1 begins to
operate when the control switch
1 is pressed.
– The water recycling unit continues to run for a few
seconds after switching off the DD EC-1. Keep the
water collector pressed against the base material
during this time so that any remaining water can be
removed from the hole or core bit.
Removing the core bit
Care must be taken when removing the core bit as
it may be hot, particularly at the cutting edge. Care
before
must also be taken to ensure that the core does not fall
out of the core bit unexpectedly.
– To open the chuck, lift the lever
– Hold the tool with the tip of the core bit pointing slight-
ly downwards
– Rotate the core bit counter-clockwise approx. 60°.
– Pull the core bit out of the chuck away from the tool
.
– Lift the connection end upwards slightly and pull the
core bit out of the water collector towards the rear
.
Removing the core from the core bit
Note
– After drilling a hole vertically upwards, the water
remaining in the core bit must be emptied by tipping
the front end of the core bit down.
– Remove the core bit from the chuck.
– Hold the core bit securely and shake it until the core
falls out through the connection end to the rear. Should
parts of the core remain stuck in the core bit, tap the
connection end gently against a soft surface (wood,
plastic) while holding it in a vertical position. Alter-
natively, use a thin rod to push out the core.
Before re-inserting the core bit in the tool, ensure
that all pieces of the core have been removed from
the core bit and from the chuck. Pieces of the core falling
out of the core bit while drilling could cause injury.
Removing the core from the hole
– On occasion, a core may stick in the hole. Using a
suitable prybar, break the core loose and remove it
from the hole.
Removing the water flow sight glass
– Slide the water flow sight glass release button towards
the chuck.
– Lift the water flow sight glass away in an upwards
direction.
– Remove the water flow indicator wheel and axle.
– Remove any dirt or fragments.
Check the sight glass seal for damage and replace it
if necessary.
on the DD EC-
to the 30°, position.
.
7