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7.14 Inserting a sealing disc in the water collector
3
2
1
6
4
5
7.16 Connecting the water supply
1
6
5
4
3 2
7.17 Connecting the mains supply (115 V motor unit)
(Mains socket with earth/ground connection required, 15 A fuse rating)
1
2
3
5
4
6
115V
8. Operation
8.1Operation
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7
2
1
4
8
Printed: 07.07.2013 | Doc-Nr: PUB / 5069608 / 000 / 00
1. Water collector
2. Sealing disc (select correct
diameter)
3. Clamping ring
4. Hose connection
5. Sealing ring
6. Water removal hose
A water removal system and a sealing
disc in new condition must always be
used for overhead coring.
1. Carriage
2. Fastening tab
3. Water hose
4. Water valve
5. Hose connector
6. External water supply
Water supply pressure must not
exceed 145 PSI.
1. Motor unit ON/OFF switch
2. Supply cord
3. GFCI ground fault circuit interruptor
4. GFCI test button
5. GFCI resed button
6. Mains plug specific to country
1. Select the correct coring speed.
(Change speed only when rotation
has stopped)
2. Release the carriage locking device.
5
3. Guide the core bit into the water
collector.
4. Open the water supply valve.
5. Switch on the motor.
Pay attention to the overload indicator
(6) while coring. When using a vacuum
6
basplate, the vacuum indicator (7)
must remain within the green area.
7.15 Fitting the water collector
2
1
3
4
The DD-80 E comes equipped with a
GFCI included in the power cord. The
GFCI must be operated according to
the following instructions.
1.Plug the GFCI into a 120 VAC
grounded receptacle.
2.Press «Test» button. «Fault light»
should come one.
3.Press «Reset» button. «Fault light»
should go off.
4.Do not use the DD-80 E if the
GFCI fails this test. Return to Hilti
for servicing .
After every fault or interruption in the
mains supply, switch off the moter unit
before resetting the GFCI interruptor.
Tips
I
Reduce feed pressure and tighten
carriage locking device slightly
when starting holes in order to
avoid vibration.
I
If steel reinforcement is contacted,
select lower coring speed and
reduce water flow.
(Obtain permission from authorised
person before cutting through steel
reinforcement.)
I
The diamond segments can
become polished (reduced cutting
performance) if coring feed pres-
sure is too low.
I
Inadequate water flow will cause
the core bit to overheat, resulting in
permanent damage.
1. Baseplate
2. Water collector holder
3. Water collector
4. Pressure screws
Tighten the pressure screws evenly.
Use of the water collector is mandato-
ry for overhead coring and is also rec-
ommended for all other coring posi-
tions.
I
Reduce coring feed pressure if the
overload indicator is activated (lamp
lights).
I
Water flow rates
8 -– 47 mm dia. max. 1 – 1.5 l/min.
52 – 82 mm dia. max. 3 l/min.
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