Dynamic DU892 DU893
OPERATION & SERVICE MANUALPORTABLE DENTAL UNIT

0123

Note: Before operating or maintenance the unit, please read the manual carefully. Thismanual is just for guidance, and our company has the right to improve the design.

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content
1. Brief introduction ............................................................................................................... 3
1.1 Contents of the manual ............................................................................................. 3
1.2 Performance and structure ........................................................................................ 3
1.3 Intended use.............................................................................................................. 3
1.4 Safety information .................................................................................................... 3
1.5 Periodic safety inspections ....................................................................................... 4
1.6 The requirements of external components................................................................ 5
1.7 Salert NoticesAnd Symbols...................................................................................... 5
2. Technical specifications ..................................................................................................... 6
2.1 Power parameter ....................................................................................................... 6
2.2 Performance and accessories .................................................................................... 6
2.3 Product classification ............................................................................................... 7
2.4 Conditions of transportation, storage and application .............................................. 7
2.5 Electromagnetic Compatibility................................................................................. 7
3. Product Structure and Installation ..................................................................................... 11
3.1.1 DU892 Structure................................................................................................... 11
3.1.2 DU893 Structure.................................................................................................. 12
3.2 Installation procedure ............................................................................................. 12
3. Operation Functions ......................................................................................................... 16
5：Operation： .................................................................................................................... 18
6. Operation and Maintenance ............................................................................................. 19
7.Trouble-shooting ............................................................................................................... 21
8. Air and water connection diagram of DU Series Portable Dental Units .......................... 23
8.1 DU892 air water working principle diagram.......................................................... 23
8.2 DU893 air water working principle diagram.......................................................... 23
9. DU series portable dental unit electric principle diagram ............................................. 24
9.1 DU892 Electric Principle Diagram ........................................................................ 24
9.2 DU893 electric principle diagram .......................................................................... 24
10. Notices............................................................................................................................ 25
11. DU series portable dental unit packing list..................................................................... 25

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1. Brief introduction
Thank you for purchasing our DU portable dental units. It is our company’s well-developed
multi-purpose mechanical and electrical integration of energy-saving product with small, mobile,
good appearance, less power consumption, free maintenance, safe and durable etc. It is mainly
used for clinics and hospitals in the treatment of oral health. In order to be convenient for you tooperate the unit, please read the manual carefully.
1.1 Contents of the manual
The operation manual includes brief introduction, installation and test, maintenance and so on.
You can get help referring to the contents.
1.2 Performance and structure
DU portable dental units include 3-way syringe, handpiece, foot control, clean bottle, drain bottle,
built-in oil-free air compressor, air tank, and drawbar.
1.3 Intended use
The DU series portable dental unit was designed to be used in dental clinics and hospitals, as
one of the main units for dental Diagnosis, prevention, and surgical treatment.
1.4 Safety information
1.4.1 Electric safety●To avoid the risk of electric shock, this equipment must only be connected to a supply mains
with protective earth.
● Before connect the power plug, please ensure the power voltage consistent with the named
voltage which this product required.
● To avoid unsteady voltage, please do not use the power socket together with other electric
equipment.
● Before maintain or repair the product, please unplug that electric wire firstly.
● Please check the electric wire and plug regularly to avoid the damage or extrusions.
1.4.2 Cleaning
Please keep the environment around the product clean. Unplug that electric wire before cleaning
the machine. The process of cleaning as follows: firstly wipe the outer surface with a soft cloth
stained with neutral detergent, and then use a soft cloth to clean the machine again.
Warning: Do not use liquid or detergent containing flammable substances.
1.4.3 Other safety information
When using the product, please strictly operate the machine in according to the following rules:
1) Disinfection and sterilization
Before use, disinfection and sterilization are necessary to avoid the infection caused by bacteriumand virus.
2) In treatment, it is necessary for the patient to breathe only by nose to avoid the risk ofswallowing the cracked equipments.
3) The handpieces should be operated with distilled water simultaneously. If operate thehandpieces without distilled water, the handpiece will overheat and cause damage to the teeth.

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4) Only skilled staff through training can operate the equipment. Undue operation may cause
severe injury.
5) This product cannot be used in flammable mixture environment.
6) This product cannot be used in anesthetic and air, oxygen, nitrogen mixture environment.
7) Don't put the equipment together with oxygen cylinder.
8) Please do not operate This product or replace the accessories when the following situations
occur:● Damage of the power plug
● Equipment cannot work normally● Breakdown of the equipment● Water inlet of the equipment● Loud or shrill noise, overheating outlet air or foul smells during operation.
When above situations occur, please contact with the manufacturer or local agent. In order to beconvenient for us to offer after sale service, please offer drawing of electrical circuit, air and water
connection diagram, packing list and other useful information when necessary.
9) Please use original or qualified disinfector.
10) Turn off the power when the operator left.
11) Dispose of waste liquid and waste solid according to the local health regulations.
12) Do not use and store the equipment outside the specified environment.
13) Keep accessories from dropping to avoid damages.
14) Keep the electric wire from loosing in the process of treatment.
15) Please use accessories from original manufacturer.
16 Keep the equipment in a solid and horizontal level.
1.5 Periodic safety inspections
The following projects should be inspected at least once a year by the trained and skilled person:
Check the equipment and the functional status of the machinery in the attachment.
Check whether the mark of the related safety is clean or not.
Check whether the blown fuse accords with the current rating fuse and the characteristic
Check whether the performance of the equipment accords with the description in the manual.
Testing whether the ground resistance is less than the required resistance described in the
IEC60601-1: 0.1Ω.
Testing whether the earth leakage current is less than the required resistance described in the
IEC60601-1: normal Condition: 500uA, single fault condition 1000μA.
Testing whether the touch leakage current is less than the required electric current described in
the IEC60601-1: normal Condition: 100uA, single fault condition: 500 μA.
Testing whether the patient current leakage is less than the required electric current described in
the IEC60601-1: for the alternating current: 0.5mA, for the continuous current: 10μA.
Testing whether the patient leakage current is less than the required current described in the
IEC60601-1 in the single fault condition: for the alternating current: 0.5mA, for the continuous

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current: 50uA.
Testing whether the auxiliary leakage current is less than required current described in the
IEC60601-1:
The alternating current in the normal condition: 0.10.5mA, for the continuous current 10μA;
The alternating current in the single fault condition: 0.5mA, for the continuous current is 50 μA.
Write down all the test data on the operational diary, if the above test is failed or the equipment
cannot work normally, then you should maintain the equipment.
1.6 The requirements of external components
1.6.1 All external parts must be certified by CE, and also you need to check technical parameters
related to spare parts, sketch map, technical manuals and instructions, production qualification
test report and other contents.
1.6.2 Check whether the parts will accord with the requirements of the company before Installation
the parts.
1.6.3 The installation parts should be operated by the trained person.
1.7 Salert NoticesAnd Symbols
In the Installation, Operation and Maintenance Manual and on packaging and product, thefollowing labels or symbols are used for important information:

SN

Fuse

Attention, see instructions for use

Ground Protective

ON

Serial Number

OFF

Producing Date

Manufacturer

Type B Equipment

EU Representative Information

Saliva ejector with
Water
hand control-valve
On / Off switch

High-speed/Low-speed swtich

Coolant

Handpiece-Air

Foot – operated

Foot switch

Speed control

Ultrasonic scaler

3-way Syringe

Spray cooling

Handpiece

Scaler switch

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Fragile

This Side UP

Keep Dry

Limited Stacking
This symbol indicates that this

LED Curing Lightproduct is not to be disposed withyour residential or commercial waste.

2. Technical specifications
2.1 Power parameter
Figure 1
Rated
Model

Voltage/Frequency

Fuse value

Inflatablecurrent～110-127V
DU892

time

Weight

550VA

≤6.4A

F8AH 250V≤35 S

450×310×680 mm

26kg～220-240V 50-60 Hz

550VA

≤3.2A

F5AH 250V≤35 S

450×310×680 mm

26kg～230V 50Hz

550VA

≤3.2A

F5AH 250V≤35 S

450×310×680 mm

26kg

550VA

≤6.4A

F8AH 250V≤35 S

450×310×680 mm

28kg～220-240V 50-60 Hz

550VA

≤3.2A

F5AH 250V≤35 S

450×310×680 mm

28kg～230V 50Hz

550VA

≤3.2A

F5AH 250V≤35 S

450×310×680 mm

28kg

60 Hz

～110-127V
DU893

Net
Specification（W×D×H）

Power

60 Hz

2.2 Performance and accessories
Performance and Accessories
No.

Model

Tank

Motor

Unit

H.S.

L.S.

Instrument

3-way

SalivaLED

Handpiece

Handpiece

tray

SyringeEjectorCuringconnector

connector

1pc

Scaler

Light

2pcs

1.

DU 892

●

●

●

●

●

●

●

2.

DU 893

●

●

●

●

●

●

●

●

●

Note: “●” Basic Accessory, “○” Optional Accessory

Figure 2

Warning: Please operate the unit strictly under the named supply voltage, because theunsteady current can cause injuries to the unit.
Please install power voltage regulator when supply voltage is unsteady, and the rated power is
no less than 1000VA.
2.2.1 Air supply parameter
The air supplied by the built-in compressor is clean and dry (Air pressure: 4-6.5bar, air flow: >50L
／min ). If the compressed air is wet, press the drain valve to drain off the water in tank timely.

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2.2.2 Water supply parameter
The water offered for the handpiece and other parts is directly from clean water bottle; please refill
the bottle with distilled water timely.
2.3 Product classification
2.3.1 Classification of electric shock protection: TypeⅠequipment.
2.3.2 Classification of electric shock guarding: Type B equipment.
2.3.3 Classification of waterproof: Normal equipment.
2.4 Conditions of transportation, storage and application
2.4.1 Transportation and storage
The machine should be transported and stored in following condition:
Temperature: -10℃~+50℃
Range of relative humidity: ≤90％
Range of atmospheric pressure: 50 kPa ～106 kPa
2.4.2 Working condition
Temperature: 5～40℃
Relative humidity: ≤80％
Atmospheric pressure: 86kPa ～106kPa
The dental unit should not be used in the environment with a mixture of flammable anesthetic,
oxygen and nitrogen.
2.4.3 Mode of operation:

Intermittent Running

Mode of operation of the portable dental unit depends on the working system of its motor.
The motor’s duty cycle is S3 30%.
The S3 is an intermittent cycle work system, means that Is run by a series of the same work
cycle, each cycle includes a constant load operation time, and a broken can halt time, the starting
current of each cycle does not significantly influence on temperature rise is 30% duty cycle,
namely load duration and the percentage of the ratio of the whole cycle time.
2.5 Electromagnetic Compatibility
The machine pass the electromagnetic compatibility test of IEC60601-1-2, should you have any
questions, please contact our service department, thank you!

Electromagnetic Emission Standards and Our Announcement
DU series dental unit should be used in following electromagnetic environment, and the use of this product should
ensure to use under suitable environment.
Electromagnetic Emission
Standards

Electromagnetic Environment Standards

Test
CISPR 11 I
Radiation Electromagnetic
FORM
DisturbanceElectromagnetic emission of DU series dental unit can only
A CLASSsatisfy its inherent functions, so its wireless radiation level is so
CISPR 11 I
low, that could not effect the contiguous electronic equipment.

Power Disturbance Voltage

FORM
A CLASS7

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Harmonic Emission

IEC 61000-3-2

DU series dental unit can used by all companies and institutes,
and could not connect with household or public low voltage

Voltage Fluctuation/Flashpower system.

IEC 61000-3-3

Electromagnetic Emission Standards and Our Announcement
DU series dental unit should be used in following electromagnetic environment, and the use of this product should
ensure to use under suitable environment.
IEC 60601
Electromagnetic Emission
TESTStandards

Electromagnetic Environment Standards

Test
VALUE
Electrostatic Discharge

6 kV Touch

6 kV Touch

The materials of floor should be wood, concrete(ESD)

8 kV Air

8 kV Airand ceramic tile.

IEC 61000-4-2

If the floor is synthetic material, relative humidity
no less than 30﹪.
2kV Power2kV PowerThe quality of power supply is used in special

Supply Line

Supply Linecommerce or hospital.

Surge (Impact) IEC

1 kV Line

1 kV Line to

The quality of power supply is used in special

61000-4-5

to LineLine Mode

commerce or hospital.

Mode2 kV Line to2 kV Line

Earth Mode

EFT IEC 61000-4-4

to EarthMode
Voltage Sag And Short<5% UT<5% UT

The quality of power supply is used in special

Supply Interruption Voltage(>95% dip in(>95% dip incommerce or hospital. When DU series portable

ChangeUT)

UT)dental units need to continuous operation when

IEC 61000-4-11

for 0.5 cycle

for 0.5 cycle

grid interrupts, please use uninterruptable power

40% UT

40% UT

output.

(60% dip in(60% dip in UT)

UT)for 5 cycles

for 5 cycles

70% UT

70% UT(30% dip in UT)(30% dip infor 25 cycles

UT)<5% UTfor 25 cycles(>95% dip in<5% UT

UT)(>95% dip infor 5 sec

UT) for 5 sec
Power Frequency Magnetic

3A/m

3A/m

/

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Fields IEC 61000-4-8
Note:

UT is alternating voltage before testing.

Electromagnetic Emission Standards and Our Announcement
DU series dental unit should be used in following electromagnetic environment, and the use of this product should
ensure to use under suitable environment.
IEC 60601
Protection TestTESTStandards

Electromagnetic Environment Standards

VALUE
Portable or mobile radio communication equipment should
stay away from DU series portable dental unit， including
cables, also should leave more than the recommended
separation distance calculated.
Recommended separation distance 3 .5 d  P V1 
Radio

3 Vrms3 Vrmstransmission

150 kHz to

IEC 61000-4-6

80 MHz3 V/m

80 MHz 800 MHz
 3 .5 
d 
 P
E
 1

 7 
800 MHz 2.5 GHz
d   P
E
 1

Radio radiation

3 V/m

P: is the fixed output power by radio equipment

IEC 61000-4-3

80 MHz to

manufacturer, the unit is W.

2.5 GHz

D: Recommend separation distance. Fixed radio transmitter,
determined by electromagnetic measurements, A: Eachfrequency band must be less than the standard
requirements. B: The equipment maybe interfered nearby
the device with following symbols:

Note:

1

Between 80 MHz and 800 MHz, higher frequency range applies.

2

This specification maybe do not suitable for all situations, because the propagation of electromagnetic

waves can be effected by the absorption and reflection of buildings, objects and people.
A:

The electromagnetic strength of fixed radio transmitter, such as radar station, cordless telephone and mobile
radios, amateur radio, FM and AM radio and television, this can not be predicted in theory. The estimated ofelectromagnetic environment depends on the fixed radio transmitters, and electromagnetic measurement points
should be considered. If the magnetic strength nearby the DU series is more than the above allowed value, thenDU series portable dental unit should be observed to verify by the normal operation. In addition, when to
re-install the DU series portable dental unit, the above information should you measured again.

B:

Frequencies above 150kHz to 80 MHz, the electromagnetic intensity should be less than 3V/m.

Recommended separation distance between DU series portable dental unit and Portable or mobile radio
communication equipment
DU series portable dental unit for radio interference to be controlled electromagnetic environment, the users of DU

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series portable dental unit should ensure the minimum distance between the DU portable dental unit and portable ormobile radio communication equipment according to the following recommended value, and take the maximum output
power into account.
Communications equipment, the rated

Separate communication channels established in accordance with the

maximum output power(W)distance(m)
150 kHz to 80MHz

80 MHz to 800 MHz

800 MHz to 2.5GHz

 3 .5 d  P
 V1 

 3 .5 d  P E1  7 d   P E1 

0.01

0.117

0.117

0.233

0.1

0.369

0.369

0.738

1

1.167

1.167

2.333

10

3.689

3.689

7.379

100

11.667

11.66723.333

Because the rated maximum output power of communications equipment do not mentioned above, the recommended
separation distance d (meters) can be estimated according to same communication device. P is the maximum
output power (in watts) according to the communications equipment manufacturers.
Note:

1. From 80 MHz to 800 MHz, separation distance is more accordance with the higher frequency.
2. This specification do not apply to all situations. Because the propagation of electromagnetic waves bybuildings, objects, people effects of absorption and reflection.

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3. Product Structure and Installation
3.1.1 DU892 Structure

1. Saliva Ejector

8. Air Adjustor for Low-speed Handpiece

15. Foot Control

2. housing

9. Water Adjustor for High-speed Handpiece

16. Handle

3. 3-way Syringe

10.Water Adjustor for Low-speed Handpiece

17. Pressure Gauge of Handpiece

4 Air Adjustor of Saliva Ejector

11. waste water Bottle

18. High Speed Handpiece

5. Air Switch of Clean Bottle

12. Fan

19.Low Speed Handpiece

13. Drain Valve

20. Clean Bottle

14. Power

21. Instrument Bag

6.

High-speed/Low-speed

Transferring Switch
7. Air Adjustor for High-speed
Handpiece11

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3.1.2 DU893 Structure

1. Air Adjustor of Saliva Ejector

9. waste water Bottle

17.Clean Bottle

2. Air Switch of Clean Bottle

10.Scaler Power

18. Scaler

3.High-speed/Low-speed

11.

19.LED Curing Light

Fan

Transferring Switch
4. Air Adjustor for High-speed Handpiece

12. Drain Valve

20.High Speed Handpiece

5. Air Adjustor for Low-speed Handpiece

13. Power

21. Pressure Gauge of Handpiece

6. Water Adjustor for High-speed Handpiece

14.Foot Control

22．Low Speed Handpiece

7. Water Adjustor for Low-speed Handpiece

15. Foot Control of Scaler

23. 3-way Syringe

8.Scaler Coolant

16. Instrument Bag

24. Saliva Ejector

3.2 Installation procedure
3.2.1 Open-package Inspection
Open the package, and check whether the dental unit is in good condition, check complementof unit, spare parts and consumable parts according to contract list .according to the packing list.
If you have any questions, please contact our distributor or our company directly.
3.2.2 Installation
Take out the device and put it on the flat, solid floor. To open the case, and take out the footcontrol and water bottle on the floor, then take out the high speed handpiece connector, low speed
handpiece connector,3-way Syringe and other application parts , hang them separately on thecorresponding Holder(refer to fig1 )12https://www.kadashika.jp

3.2.3 Handpiece
Our handpiece connector meets the standard ISO 9168, is the Type 3 (4-Line) /1(2-line）handpiece
connector. Our standard configuration does not include the handpiece, and users should equipthemselves with the handpiece that is suitable for our handpiece connector. The type 3 connector’s structure of ISO 9168 shown in figure 2 and figure 3.
The type 1connector’s structure of ISO 9168 shown in figure 4 。

Figure 2 handpiece part of Type 3 connector

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Figure 3 handpiece hose part of type 3 connector

Figure 4:handpiece hose part of type 1 conntector
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Note: Attach a sterile handpiece to the (4-Line) handpiece connector and place thehandpiece in Holder.

Warning: Do not run the handpiece without the pressure.

Statement：Only the handpiece which include anti-retraction function are to be used
together with the dental unit.
3.2.4 Scaler (DU893)
The installation of scaler, please refer to its manual, use the torque wrench for scaler head andturn the head of scaler tighten, Otherwise it will not work. When you need to screw off the head of
the scaler, you also need to use this torque wrench, as shown in figure 5.

The

head

of

scalerThe

torquewrench for scaler
head
Figure5 the torque wrench for scaler head

Warning: There must be water of scaler, of will harm the patient and affect the life of scaler.
3.2.5 LED curing light (DU893)
The installation of LED curing light:As shown in figure 6, the optical tip is first inserted into the lightcuring machine, and then the filter plate is installed in the position shown in the figure. Please refer
to its manual for detailed steps and note case.

Figure 6 Installation diagram of LED curing light15

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3.2.6 3-way Syringe
The unit is equipped with a 3-way syringe, which use the distilled water together withhandpieces. The inlet water tube and inlet air tube are connected to connector of the back panel.
Press down (refer to Figure 7) the ring nut and insert the nozzle, and then lock the nozzle byresetting the ring nut.

Ring nut

NozzleFigure 7 Installation diagram of 3-way syringe
3.2.7 Saliva ejector
The unit is equipped with a saliva ejector, MHC provide 2 disposable suction tips for user. Please
insert the disposable suction tip to the saliva ejector before use (refer to figure 8). The disposable
suction tips after used should be handled according to local laws and regulations

The disposable
suction tip

Saliva ejector
switchSaliva ejector
Figure 8 Saliva ejector tips
3.2.8 PowerTake out the power card from the instruments bag, connect the power card with the dental unit,
and then connect the power plug with the power socket.

4：Operation Functions
1. Foot Control Controls:
The Foot control enables the operation of the handpiece, Saliva Ejector。.

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2：Foot Control of Scaler controls
The Foot control of Scaler enables the operation of the Scaler。
3. Handpiece Controls:a.) Handpiece Off/On Toggle Switch - TurnsHandpiece pneumatic drive pressure Off/On.
b.) Off/On Coolant Toggle Switch - TurnsHandpiece water coolant On/Off.
c.) Air Control Switch - Allows adjustment of airpressure to the Handpiece.
d.) Coolant Control Switch - Allows adjustmentof water coolant to the Handpiece.
Note: This time, the “Pressure gauge of handpiece” in the panel is the working pressure of
handpiece, when using the handpiece, please do not exceed the max pressure of handpiece, andavoiding the harm of handpiece. To adjust the handpiece carefully, the turbine of handpiece is theprecision devices, please read the manual before using carefully.
3. Three-Way Air/water Syringe:- Pressing the left button dispenses water.
- Pressing the right button dispenses air.
- Pressing both buttons simultaneously dispenses an air/water mist.
4. Water Supply Bottle:
The unit incorporates a self containedpressurized water system. This system consistsof a 1-literwhite bottle, which dispenses water through the handpiece and 3-Way Air/Water Syringe.
located in the upper right corner of the case.
For this unit, all water for handpieces, 3-way syringe and Ultrasonic Scaler are from the cleanwater bottle. Thus, the user needs to add the distilled water to the clean water bottle timely.
The methods of adding water is following:
1. Turn off the air switch, when the air in the bottle is drained off, holding the bottle by your hand,rotate clockwise and take down the bottle.
2. After injecting the water, counterclockwise rotate the bottle and make it tight (note to seal).
3. Then turn on the air switch, the process of adding water is finished.
In general, any of the following conditions having, you need to clean the bottle and change waterin it.
1)

The unit is not used by more than three days.

2)

After using every day, you need to clean it.

3)

The color of the water in the bottle is changed. (Not colorless transparent water)

5：Saliva ejector
The unit is equipped with a saliva ejector. Open the switch, use adjustor to adjust the suction flow,
it could work normally.
Note:
1. The unit could only use alone, it could not use together with handpieces at the same time. If not,it would affect normal use of handpieces.
2. Suck a cup of purified water, eliminate the seeper in the tube and clean the saliva bottle eachday after use.

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3. When cleaning, screw it off in an anticlockwise direction then use the disinfectant to clean it.
Then screw it on the counterclockwise. (Note to tighten)
4. When the sewage collection bottle exceeds the highest water mark in the logo, pleaseclean the sewage in time, and then loaded on to continue using.
5.Saliva Ejector function requires exhaust, when using the salivary function, please connect thebacterial filter to the bacterial filter installation connector( bacterial filter is optional); If
device has bacterial filter, when the negative pressure gets lower obviously or no negative
pressure, please check the bacterial filter, if there is any contaminant or moisture blocking,please replace it before use.
5 Ultrasonic Scaler (DU893)
The unit is equipped with an ultrasonic scaler. Pick up the ultrasonic scaler from the shelf; tread
down the foot control, then it could be used normally. The power output could be adjusted. The
adjustor is equipped on the face panel.
The head of the ultrasonic scaler must be screwed tighten. If not, there would have no efficient
power output. The parts are rigid, please read the operation manual carefully.
Note: The ultrasonic scaler only could work with water supply, or that would damage theultrasonic scale.

6 :LED curing light (DU893)
The unit is equipped with LED curing light. From the accessories, you may find the operation
manual of curing light in its box, please read its operation manual for detailed operation steps.

5：Operation：
1. Connect the power cord to the unit and plug into appropriate power source.
IMPORTANT: Ensure that the Voltage
2：Turn the operation handle of power switch to “1”（fig 4） the unit will
start immediately pressurize.(See Fig. 10).
3：Depress the Foot control: system components(Handpiece,Saliva Ejector) will activate.
4：Pick off the handpiece from rack, and please turnthe “Low speed /high speed transferring switch” tothe “high speed handpiece”, press the foot control,
turn the “Pressure Adjustor of High Speed Handpiece”
counterclockwise, to adjust the handpiece to spraywater from small to large. The turbine of handpiecestart to spring water: namely that the handpiece
begin to work.（see fig 9）
5：Pick off the handpiece from rack, and please turnthe “Low speed /high speed transferring switch”
to the “low speed handpiece”, press the foot control,
turn the “Pressure Adjustor of Low Speed Handpiece”
counterclockwise, to adjust the handpiece to spray

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water from small to large. The turbine of handpiecestart to spring water: namely that the handpiece begin to work.（see fig 9）
6. Use the 3-Way Air/Water Syringe as necessary for irrigation or drying.
7. Pick off the Saliva ejector from rack,Open the Saliva ejector switch, （see fig 7）use adjustor toadjust the suction flow, it could work normally.
8：Pick off the LED curing light from rack,it could work normally.

9：Pick off the Scaler from rack,press the foot control of Scaler ，adjust the Scaler coolant andScaler power,it could work normally.
（see fig 11）

6. Operation and Maintenance
6.1 Because of its simple design, the DU series dental unit requires very little maintenance. Any
maintenance that is needed can be performed in minutes.

6.2 Bleeding the system
If the unit will not be used for an extended period of time, or the unit might be subjected to freezing
conditions, you should bleed the system. Simply empty the contents of the water bottle and install
the bottle back into the cap. Operate the 3-way syringe and handpiece with water coolant ‘ON’
until just air comes through the water line. Pack unit and store as normal.

6.3 Handpiece flush
6.3.1 Flush the handpiece for about 5 seconds after every patient, and about 20 seconds at the
beginning of each day.
6.3.2

Before using handpieces, the user need to roll and spray by 1 to 2 second to get rid of thedirt in tube, then prevent the occurrence of cross-infection.
6.4 General cleaning
6.4.1 The external surfaces of the case should be cleaned using a soft cloth moistened with a mild
detergent solution. Any external surfaces of the unit that are contacted during use should be wiped
down with a soft cloth moistened with a disinfectant at the beginning of each day and between
each patient use.
6.4.2 Wipe surface of the units, prevent harmful materials from corroding the units.
6.5 Cleaning and disinfecting water path
Disinfect the water path weekly. Prepare a 1:10 bleach solution (1 part household bleach to 10
parts water). Remove water reservoir and discard residual water. Replace empty water supply
tank and air purge all water path. Fill clean water bottle with bleach solution. Run bleach solution
through all path. Allow bleach solution to stand in path for 10 minutes. Remove water supply tankand discard bleach. Flush water supply tank and all path thoroughly with clean water. Air purge
and leave path dry until next clinical use.
6.6 Cleaning and disinfecting 3-way syringe tips
The DU series dental unit features a 3-way syringe with quick-change autoclavable tips. To
remove a tip, press on the locking collar surrounding the tip socket and pull the used tip straightout of the socket (see Fig. 8). To insert a new tip, press locking collar and push tip into socket as19

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far as it will go. Release collar and gently tug on tip before using to ensure that tip is securely
locked into socket.
Syringe Tip Sterilization:
1) Remove contaminated syringe tip.
2) Remove all visible signs of contamination before autoclaving.
3) Autoclave tip at 132° C (270° F) for ten minutes.
4) Sterilize between each patient use.
NOTE: Since only the tips can be autoclaved, it is recommended that the Air/Water Syringe bebagged with a disposable, single-use plastic sleeve between each patient use.(refer to figure 6
the 3-way syringe)
6.7 Cleaning the waste water bottle
After using waste water bottle, suck a cup of purified water, to clean the tube, suction generator
and other spare parts to protect them from congestion and damage.
The suction tip is disposable, the abandoned suction tip shall be disposed according to the local
laws and regulations of the user.
6.8 Cleaning and disinfecting handpiece
6.8.1 By using handpieces, you need to strictly comply with the operation and maintenance of the
handpieces.
Note: the cleaning and lubrication of handpieces.
6.8. 2 Please turn off the water switch, power switch and air switch when leave after treatment.
6.8.3. After using handpieces and before sterilization, the user needs to make the cleaning andlubrication, to make the handpieces work normally and prolong the use time. By using handpieces,
you need to strictly comply with the operation and maintenance.
6.8.4 The following requirements are completely according to the provisions of the handpieces
instruction manual.
● Remove the handpieces● Get rid of all visible dirt.
● Make sterilizing in the saturated steam of 132℃by 10 minutes● After treatment by each patient, please make them sterilizing before treatment for next patient.
Note: For the parts which couldn’t tear down, please use disposable plastic package tosphere when using.
6.9. Cleaning and Disinfecting ultrasonic scaler
The following requirements are completely according to the provisions of the ultrasonic scaler
instruction manual.
● before sterilization, please clean the ultrasonic scaler and the tip.
● Sterilization condition: 135℃in 10 minutes or 120℃in 20 minutes● Use the soft cloth with 45% cleaner to clean the ultrasonic scaler. Do not make it into any liquid
or directly spray any liquid. Or the liquid would enter into ultrasonic scaler to make it cutting-out
and damage.

20

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6.10. The handpieces tube and connections of ultrasonic scaler could only be cleaned by cleaner
instead of temperature sterilizing.
6.11 Cleaning and Disinfecting of LED Curing Light
Please refer to the instruction manual of LED Curing Light for detail.
6.12 Change the fuse tube
6.12.1 Pull out the plug from the socket; pull out the fuse cover from the fuse socket.
6.12.2 Take out the damaged fuse tube
6.12.3 Insert the new fuse tube by make the fuse rating consistent with fusing feature in instruction
manual.
6.12.4 Press the fuse cover in the fuse socket.
Note: The fuse tube unqualified could cause fires!

7.Trouble-shootingItemProblemReasonCheck

The water in water tank

Check the water volume ofhas been used up.

the water tank.

Tips

Add the distiller water.
Check the “Air switch” isAir & water distributing

Open the “Air switch”,

open or not, or is working or

The handpiece
valve is blocked.

or replace it.

can not spraynot.

water while

Check the 3-way syringe

rotating.

sprays water or not.

1
Regulate the Air &The double air switch canwater distributing valve
Check the air pipe is good or

not work

or clean the valve corenot, or check the core canand o-ring.
work or not.
Remove one side of thevalves in handpiece, take out

Air & water distributing

replace the valve corefaucet, spring and valve core.

The handpiece

valve fails to function.

and o-ring
Check there is any dirty, andleaks water2

o-ring can work or not.

when not in

The pressure gauge does notoperation.

Open the cover of footThe foot switch is notdecrease when foot switch isrestored.

put up, to check the o-ring ofcontrol, and clean theo-ring.
foot control.
Open the adjustor valve andInstall the core

to check it.

correctly.

The core is circled too far.
The air switch
3
leak water or air

The core and o-ring isOpen the adjustor valve andbroken.

to check it.

Replace the o-ring21

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The connector of valve is

Check the connector leak theTurn the connector

too loosewater or air or not.

tighten.

Check the water button of the

Clean or replace the

3-way syringe.

core and o-ring.

Let the professional person

Use the voltage

check the voltage.

stabilizer.

The button of 3-way

4

The 3-waysyringe is not restored, or

syringe leads

there is dirty, or the corewater and air

and o-ring can not work
well.

The noise or
shaking is so5

The voltage is too low.
big, unit can notwork.
The built-in
compressor

The wire to the power

Check the connector ofConnect the line

can not be

supply has fallen off.

power is good or not.

correctly.

6
started up
Open the panel, and to checkthe connector line andLet the professional

component When the

person connect thecompressorline according to circuit

work, the solenoid valve candiagram Open the core

The built-in air

not

of

compressor

close completely.

Power line orelectronic
component is loose. The
solenoid of compressor
can not work normally.

7

keeps working

The pressure switch is

Check the pressure switch

Adjust or replace theand can not be

broken.

works normally or not.

pressure switch.

stoppedConnect theReserve or listen the air flow,
various connector
The connector leaks air.

or use the bubble to checkcorrectly, avoiding
the connector of leakage air.
leaking air.

Pressed drain valve leaks

Check the pressed drain

air.

valve leakage of air or not.

Air switch was close

Check the air switch

Open the air switch

Check the water volume of

Add more distiller

the water tank.

water

Check the water adjustor

With large water flow

Avoid leaking air.

No water in bottle
No water for
8

The water adjustor ofscalerscaler is closed
Solenoid vale of scaler

Replace the Solenoid
Check the solenoid valve

was broken

Valve

22

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8. Air and water connection diagram of DU Series Portable Dental Units
8.1 DU892 air water working principle diagram

AIR INTAKER
SAFETY VALVELOW SPEED/HIGH
SPEED TRANSFERRNGSWITCHJ

AIR FORHIGH-SPEEDHANDSPIECE

N

K

K

G

J

L

AIR FOR
LOW-SPEEDHANDSPIECE L

M

M

DOUBLE AIR

Q

EXHAUST SOLENOID VALVE

MOTOR

A CONTROL VALVE
C
Q
B
Q
D

FIVE-DIRECTION
VALVE

O Q

N

B

3-IN-VALVE

O P

FIVE
DIREVTION
WALVE

HANDPIECE
PRESSURE GAUGEWATER FORHIGH-SPEED
HANDPIECE

G

F

WATER BOTTLE
PRESSURE GAUGESAIR SWITCHR
CLEANWATER
BOTTLE REGULATOR

E
R

D

C

WATER FOR
LOW-SPEEDHANDPIECE

SUCTIONGENERATORBACTERIAFILTERH.S.
HANDPIECE

FOOT CONTROLTANKDRAIN PIPE

CL.S.
HANDPIECE

S
A

WEAK
SUCTION
REGULATORE
AIRFILTER
REGULATOR

B

C

D
3-WAY
SYRINGE

CLEANWATER
BOTTLEDFCHECK VALVE
SALIVAEJECTORT

B

WATER WAYT

PRESSURE
SWITCH

AIR WAY

EXHAUST PORTPRESS DRAIN VALVE

SALIVA PIPE

DIRTBOTTEL

8.2 DU893 air water working principle diagram

LOW SPEED/HIGH
SPEED TRANSFERRNGSWITCHJ

AIR FORHIGH-SPEEDHANDSPIECEKKSAFETY VALVEG

AIR INTAKERJM

AIR FORM
LOW-SPEEDHANDSPIECE L

L

N

Q

A

FIVE-DIRECTIONVALVE

DOUBLE AIR
CONTROL VALVE

Q

O Q

Q

C

B

D
N

EXHAUST SOLENOID VALVE

MOTOR

FIVE
DIREVTIONWALVEFWATER BOTTLE
PRESSURE GAUGE

B

3-IN-VALVEO PPRESSURE GAUGEOF HANDPIECEGSWATER FORHIGH-SPEED
HANDPIECEC

AIR SWITCHR
CLEANWATER
BOTTLE REGULATOR

E
R

BACTERIAFILTERE

TANK

DRAIN PIPE

AIRFILTER
REGULATOR

B
PRESSURE
SWITCHSUCTIONGENERATOR

D

C
B

FOOT CONTROL

C

D

WEAK
SUCTION
REGULATOR

H.S.
HANDPIECE

S
A

L.S.
HANDPIECE

D
3-WAY
SYRINGE

CLEANWATER
BOTTLEF
SALIVAEJECTORT
T

PRESS DRAIN VALVE

WATER FOR
LOW-SPEEDHANDSPIECECHECK VALVETANK BOTTLE
PRESSURE GAUGEWATER WAY

EXHAUST PORT

AIR WAYDIRT
BOTTEL23

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SALIVA PIPE

9. DU series portable dental unit electric principle diagram
9.1 DU892 Electric Principle Diagram
MOTOR

FUSED POWER SWITCH
～230V

FAN
PLUG

EARTH WIREEARTH WIRE
SOLENOIDVALVECAPACITOR

pressureswitchCONNECTOR

9.2 DU893 electric principle diagram
M
O
T
O
R

F
U
S
E
DP
O
W
E
R
S
W
I
T
C
H

～230V
F
A
N
P
L
U
G

E
A
R
T
HW
I
R
E
l
E
D
c
u
r
i
n
g
l
i
g
h
t

E
A
R
T
HW
I
R
E
S
O
L
E
N
O
I
D
V
A
L
V
E

C
A
P
A
C
I
T
O
R

T
R
A
N
S
F
O
R
M
E
R

p
r
e
s
s
u
r
e
s
w
i
t
c
h
C
O
N
N
E
C
T
O
R

3
0
w

M
I
C
R
O
S
W
I
T
C
H
E
L
E
C
T
R
I
C
F
O
O
TC
O
N
T
R
O
L

C
O
N
N
E
C
T
O
R

P
CB
O
A
R
DO
F
S
C
A
L
E
R

2
4 2
4
v v

y
e
l
l
o
w
r
e
d

2
4

1
0
w

r
e
d
w
h
i
t
e

S
O
L
E
N
O
I
D
V
A
L
V
E
P
O
W
E
R
C
O
N
D
I
T
I
O
N
I
N
G
U
N
I
T

2
4

24

https://www.kadashika.jp

s
c
a
l
e
r

10. Notices
Storage
If the compressor will not be used for a prolonged time period, drain any condensate fromthe air tank. Then turn on the compressor for 10 minutes, keeping the drain valve open (1).
Switch off the compressor by switch (3) at pressure switch (2), close the drain valve anddisconnect the appliance from the mains.
Disposeing of The Appliance• Disconnect the appliance from the mains.
• Release air pressure in the pressure tank by opening the drain valve (1) (Fig.10).
• The components of the product are non-toxic.
• Dispose of the appliance following all environmental regulations.
Repair Service
Guaranteed and post-guarantee repairs must be done by the manufacturer, its authorized
representative, or service personnel approved by the supplier. The manufacturer reserves theright to make changes to the appliance without notice. Any changes made will not affect thefunctional properties of the appliance.
Solving Problems
Caution! Before proceeding, depressurize the air tank to zero and disconnect theappliance from the mains.
11. DU series portable dental unit packing list
Series

Product name

No.

Suitable for following models

Quan Unittity

1.

DU series body

1 pc

One of DU893、DU892

2.

Instruction

1 pc

One of DU893、DU892

3.

Accessory bag

1 pc

One of DU893、DU892

4.

Clean water bottle

1 pc

One of DU893、DU892

5.

Waste water bottle

1 pc

One of DU893、DU892

6.

POWER CORD

1 pc

One of DU893、DU892

Version information
Operation Manual No.DU-CE-B12
version number : (A/3)

25https://www.kadashika.jp