Ritter Excellence Chair-mounted Dental Unit · The dental chair is the continuous running of interval loading, and its running/interval time is 2min/18min. The operation of heater

Technical training manual

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Ritter Excellence Chair-mounted Dental

Unit

Manual for Maintenance Training


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Contents

I. General ....................................................................................................................................... 4

II. Illustrations ................................................................................................................................. 4

III. Transportation and storage ........................................................................................................ 4

IV. Environmental safety .................................................................................................................. 5

1. Disposal of packing material ............................................................................................................ 5

2. Disposal of equipment ....................................................................................................................... 5

V. Working Conditions .................................................................................................................... 5

VI. Structure of complete unit........................................................................................................... 6

VII. External dimension of equipment ............................................................................................... 6

VIII. Main technical parameters ......................................................................................................... 7

IX. Equipment installation ................................................................................................................ 7

1. Preparation before installation ........................................................................................................ 7

2. Pipeline layout ...................................................................................................................................... 9

3. Uncase, handling and placement .............................................................................................. 10

X. Debug and use ......................................................................................................................... 12

1. Invocate power switch .................................................................................................................. 12

2. Adjustment of filter relief valve .................................................................................................. 13

3. Main controlling board ................................................................................................................. 13

4. Operation of assistant work frame ............................................................................................ 15

5. Water purifying device .................................................................................................................. 16

6. Switch between municipal water supply and purified water bottle .................................. 16

7. Setup of the automatic control (Ritter Excellence) ............................................................... 16

8. Setup of the automatic control (Ritter Superior) ................................................................... 18

9. Heating of rinsing water ............................................................................................................... 21

10. Water supply of rinsing ............................................................................................................ 21

11. Water supply of spittoon washing ......................................................................................... 21

12. Handpiece operation ................................................................................................................. 21

13. Saliva ejector and high vacuum suction ............................................................................. 21

14. Operation of electric chair ....................................................................................................... 22

15. Operation of preset position of electric chair (Ritter Excellence) ................................. 22

16. Reset button (AM2060A) .......................................................................................................... 23

17. Operation of preset position of electric chair (Ritter Superior) ..................................... 23

18. Reset button (Ritter Superior) ................................................................................................ 23

19. Head rest ...................................................................................................................................... 23

20. Hand rest ...................................................................................................................................... 24

21. Dentist Chair ............................................................................................................................... 24

XI. Maintenance ............................................................................................................................. 24

1. Water circuit .................................................................................................................................... 24

2. Air circuit .......................................................................................................................................... 25

3. Mechanical structure .................................................................................................................... 25

4. Handpiece ........................................................................................................................................ 25

5. Water filter........................................................................................................................................ 26

6. Relief valve of air filtration .......................................................................................................... 26

7. Saliva ejector and high vacuum suction ................................................................................. 27

8. High vacuum filter screen ............................................................................................................ 27

9. Operating light ................................................................................................................................ 27

10. Fuse ............................................................................................................................................... 28

XII. Cleaning and sterilization ......................................................................................................... 28

1. Handpiece ........................................................................................................................................ 28

2. Other instruments .......................................................................................................................... 28

3. Exterior accessories ..................................................................................................................... 28

XIII. Troubleshooting ........................................................................................................................ 28

XIV. Analysis on air/water pipeline system ...................................................................................... 32

1. Handpiece pipeline .......................................................................................................................... 33

2. High vacuum suction pipeline ........................................................................................................ 33

3. Mouth rinsing and spittoon washing pipeline ............................................................................... 35

XV. Analysis on electrical control system ....................................................................................... 36


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1. Dental chair part ............................................................................................................................... 37


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I. General The meaning of signs used in the instruction manual is as follows: Attention, Caution

and Warning.

Attention: important content is included that deserves attention. Caution: it comes before some particular operations. The equipment can be damaged

once these provisions are violated. Warning: it comes before some particular operations. The equipment can be damaged

and operator can be injured once these provisions are violated.

Warning: To guarantee the safe and normal operation, this machine shall not be placed in the environment of mixture of the inflammable anesthesia gas with air or oxygen or nitrous oxide.

Attention:

� Air source provided by industrial compressor is strongly prohibited to use. � No load running and over-pressure start of the handpiece is strongly forbidden. � Clean or replace the core of the water filter timely. � No touch of the reflecting mirror is allowed when the operating light is running, in case of the scald. � The dental chair is the continuous running of interval loading, and its running/interval time is 2min/18min. � The operation of heater under dry condition is strictly prohibited. � Adjust the position of the head rest and make sure that it has been locked before using. � Cut off the power before replacing the safety fuse. � No tangible thing shall be placed within the operational stroke of this machine.

II. Illustrations

B-type Equipment

Protective Grounding

Attention! Read Attachment File A/C

III. Transportation and storage The product can be transported or stored since it has been properly packed. Under the


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following ambient conditions; it can be placed fifteen weeks at most:

a) Environment temperature: - 40�～+55�.

b) Relative humidity: <= 93%

c) Range of the atmospheric pressure: 500 hPa～1060 hPa

d) In well-ventilated room without erosive gases.

IV. Environmental safety 1. Disposal of packing material All packing material does no harm to the environment and can be completely recycled. - Wooden base plate - Carton - Polyethylene bag

The collection and recycling of packing material are good for saving raw material and disposing substantial waste. Please place the packing material in the specified deposit site of recycle material.

2. Disposal of equipment The equipment mustn't be used if it reaches its operation life. In view of this, please cut off the power first. The disposal of equipment won't cause any danger. To protect the environment, please place the equipment that can't be used any more in the specified deposit site of recycle and non-recycle material.

Warning: the manufacturer is responsible for the safety, reliability and performance of equipment only under the following circumstances:

� The installation and any repair or modification is carried out by qualified technician.

� The electric wiring of operational site must meet all the effective provisions of installation. � Operate according to operating instruction.

V. Working Conditions To ensure its normal use, the technical requirements on air, water, electricity and environment are as follows: a) Power supply: voltage 230V±10% (110V±10%) frequency 50Hz±2% (60Hz±2%) b) Air source: without oil, water and impurity Air pressure: 0.55~0.80Mpa flow≥50L/min

c)Water source: hydraulic pressure 0.2～0.4MPa flow≥10L/min

d) Environment: temperature 5～40� relative humidity≤80%


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Atmospheric pressure range:860hPa～1060hPa

e) Color of water pipe used in the product: blue Color of air pipe: Black or other colors

VI. Structure of complete unit The specific structure of complete unit will vary for different products. As a whole, the

structure consists of the following parts:

The internal composition consists of:

VII. External dimension of equipment To ensure its normal operation, please refer to Fig. 1 and keep enough space for clinical

use within its safe movement stroke.

Chair-mounted dental unit

Dental treatment unit

Electric dental chair

Dentist chair

Unit Body

Instrument tray

Ground box

Internal composition

Air circuit system

Water circuit system

Electric circuit system


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Fig.1 Movement range diagram of the unit

Attention: it will generate a weight of 450 kg in its fixed mount position (Include the load limit).

VIII. Main technical parameters

Dental chair

Minimum height between seat cushion and floor ≤480mm

Maximum height between seat cushion and floor ≥780mm

Backward angle of backrest ≥65° Up and down sliding stroke of head rest

120mm

Maximum load 135kg

Treatment unit

Operating light Illumination Color temperature

8000Lux～15000Lux

3000K～6500K

Negative pressure of Saliva ejector

≥27kPa

Negative pressure of high vacuum suction

≥12kPa

IX. Equipment installation 1. Preparation before installation According to the layout of consulting room, the lighting conditions and the convenience

for use, confirm the position of the ground box and the position of the whole equipment

in accordance with Fig. 2 and the form of ground box.


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Fig.2 Layout of whole unit


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Attention: the following items should be noted during equipment

installation.

� If there is interference between equipment motion part and environment arrangement (other equipments). � The impact on structure and use caused by direct sunshine should be prevented. � The placement of equipment should take the rationality of pipeline layout and personnel passing into consideration. � The placement of equipment should meet the environmental requirements on cleaning, dryness and ventilation. � The ground that the equipment contacts during installation should be flattened, smooth and firm. 2. Pipeline layout The pipeline layout can be started after the determination of equipment placement position. Generally speaking, one-piece dental treatment equipment usually adopts the installation mode of geosynclines type that could conceal pipeline at present. According to different floors, the construction of pipeline could adopt floor laying (pay attention to the sealing with peripheral floor), preformed geosynclines and lower isolated layer piping.

Within 200×200mm around the position of the ground box, preset the gas inlet pipe, the water inlet pipe and 1.5mm2 3-core shielded wires, and connect the ground protection. See Fig.2.

Table 1: Specification and above ground level of water pipe, air pipe and power cord pipe:

Name Specification Above ground level

Remark

Water inlet pipe

Φ15mm(1/2＂)PPR pipe

30mm Orifice

screw-threadG1/2＂ Air inlet

pipe Φ15mm(1/2＂)

aluminum plastic pipe

30mm Orifice

screw-threadG1/2＂

Drainpipe Φ40mm(11/2＂)PPR pipe

50mm

Power cord pipe

Φ15mm(1/2＂)PPR pipe

50mm

The power cord should be 3-core shield patchcord of 2mm2 and the length of bare power cord pipe should be 400mm.


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In addition, if the central suction system and the endoscope system are selected,

central suction pipes and VAG lines (PPR pipe needed) must be installed otherwise,

see the following table for specification:

Table 2: Specification and above ground level of water pipe, air pipe and power cord pipe:

Name Specification Above ground level

Remark

Suction pipe Φ20mm PPR pipe 30mm

VGA line Φ15mm(1/2＂)PPR pipe 50mm

The size of main pipe should be at least twice that of branch pipe.

3. Uncase, handling and placement

1) Uncase examination

Before opening the box, please examine the upper and lower side as well as the

surrounding of box-plate to see if there is damage due to collision and drench due to

rain, then open the box and check parts and

accessories by referring to "packing list" to

see if it is in good condition. Any queries,

please contact with the distributor immediately

or enquire with our company.

2) Handling

a) Force should be imposed on metal

material instead of backrest or seat cushion

when handling the dental chair.

b) Force should only be imposed on the

bottom when handling the treatment unit.

c) Hold the balance arm when handling to

Drai nage pi pe1-1/ 2"

i nl et pi pe Ai r i nl et

Power suppl y

wat er i nl et

Ai r i nl et pwer suppl y

rai nage pi pe

Fig.3 Pipeline connection

Copper ball valve G1/2″

Water/air inlet φ15mm(1/2″)

Straight coupling JPC8-G1/2″8


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avoid accident. (In no way should force be imposed on the balance arm)

3) Placement of dental chair

Properly place dental chair according to the preset position. (The ground used for placing dental chair should be smooth, firm and neat, because its design doesn't adopt foundation setscrew in view of the stability of complete machine. If the ground isn't smooth, the usability will be affected or even cause accident.)

4. Connection of pipeline and circuit 1) Connection of air pipe and water pipe

Properly connect copper ball valve G1/2″, straight-through joint and (Φ8×1) PU pipe

with water (air) inlet pipeline. Pay attention to sealing and strictly prevent leaking by

wrapping the source nipple.

2) Circuit connection

As showed in "electric wiring diagram", properly connect power cord and protective

ground. Properly connect the power connector and control line connector between

treatment unit pipe and dental chair, which must be tight and firm.

3) Seat cushion installation (if necessary)

� Switch on the power and open the backrest of dental chair to backward position. � Align two screws on the front lower part of seat cushion with two holes on the chair before inserting. � Use the screw on the back lower part of seat cushion to fix with dental chair. 4) Installation of operating light

� Insert the wire on the lamp arm into lamp post first and then properly connect them. � Abut the wire connector on lamp arm with the connector inside the post of treatment unit body, and put it into the post. � Thrust lamp post into post and properly install lamp arm. Don't damage wire. � Dismount screw on cold light operating light and abut the wire connector on lamp arm with the connector inside cold light operating light (connect firmly). � Insert cold light operating light into lamp arm and fix with screw. 5) Installation of handpiece (HP)

� Align four holes of joint core with relevant connection pipe of handpiece. � Align adaptor sleeve with screw mouth of handpiece, gently screw it in, moderately

Fig.4 Installation of operating light


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screw it tight until it won't leak.

Attention: No load running or over-pressure start of the handpiece is

strongly forbidden.

6) Installation of three-way syringe

� Press down spigot ring, then insert nozzle, the nozzle will be locked when the spigot ring resets. (Fig. 6)

Attention: distinguish waterway and airway (the left one is waterway

and right one is airway), check if the water and air injected by

three-way syringe match with the pattern on the button of three-way

syringe.

X. Debug and use

1. Invocate power switch

The position of power switch varies for different products. Generally the power switch is

located at the chair or the ground box.

Fig.6 Installation of three-way syringe

Nozzle Spigot ring

Handle

(For down hanging instrument tray and assistant frame)

(For up hanging instrument tray)

Nozzle

Spigot ring

Handle

Joint sleeve

Joint core Handpiece

Fig. 5 Installation of handpiece


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2. Adjustment of filter relief valve

Check the inlet pressure gauge inside the front ground box of dental chair and its value should be 0.5MPa. The pressure has been properly adjusted before release and the following methods can be used to tune it into 0.5MPa if any discrepancy arises.

Open the cover of ground box first, pull up the spindle on top of filter relief valve about

10mm (Fig.8), then rotate the spindle. Rotate clockwise to adjust the pressure upwards

and counter clockwise to adjust the pressure downwards. After adjustment, press down

spindle.

3. Main controlling board

Debug low torque air motor and high torque air turbine handpiece in turn.

Attention: � Before debugging handpiece, read instruction manual of handpiece first and understand operation air pressure of each handpiece. (Refer to the following enclosed list)

Fig.8 Filter relief valve

Filter relief valve

Knob

Power switch

Fuse

Fig.7 Power switch


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� Dental bur or test bar must be inserted during debugging. No load running or over pressure start-up is strictly prohibited. � Fill clean lubricant into handpiece before debugging. Before using, the handpiece must be adjusted within specified air pressure range. Otherwise, over-low pressure will cause invalid operation and over-high pressure will damage handpiece.

a) Our ordinary products adopt underneath type instrument tray with rectangle pressure gauge on it. Owing to the pressure loss during transport process of compressed air, indicated value on the gauge is supposed to be higher than the value on the instruction manual of handpiece.

Pressure range of rectangle gauge

Handpiece name High torque air turbine handpiece

Low torque air motor handpiece

Japanese NSK four holes

0.23MPa～

0.26MPa

0.30MPa～

0.32MPa

b) If there is a HP test adapter in the attachment, connect this adapter between the pipe and the HP. Because it is direct measurement, the pressure value on the pressure gauge of test adapter should meet the value on the instruction manual.

Pressure range of rectangle gauge

Handpiece name High torque air turbine handpiece

Low torque air motor handpiece

Japanese NSK four holes

0.18MPa～

0.20MPa

0.25MPa～

0.28MPa

A. Air and water pressure adjustment of handpiece

On the back of the instrument tray, there are air/water regulating valves (Fig.9) for

adjustment of the air/water of three-way syringe and the driving air cooling air and

cooling water of handpiece.


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If the adjustment of air and water pressure of handpiece is needed, relevant air and water regulating valves can be adjusted. Rotate clockwise to adjust down the pressure and counter clockwise to adjust up the pressure. Careful and slow adjustment is needed during adjustment.

B. Three-way syringe

Press down air-out button and water-out button respectively, mist will be sprayed out if these two buttons are pressed at the same time. Check if the spayed water, vapor and mist are suitable. If adjustment is needed, relevant air and water regulating knob on the back of instrument tray (Fig. 9) can be adjusted with the same method as above.

4. Operation of assistant work frame

Place the high vacuum suction and the saliva ejector from left to right in turns.

(1) Insert saliva ejector head reliably on saliva ejector, get moderate clear water and

Water of 3-way syring

Air of 3-way syring

Handpiece1 Driven air



Handpiece1 water

Handpiece2 water

Handpiece3 water

Ritter Excellence Water of

3-way syring

Air of 3-way syring

Handpiece1 water

Handpiece2 water

Handpiece3 water




Ritter Superior


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observe if the water suction is smooth (abstraction rate should be≥400ml/min when hydraulic pressure is 200kPa). (2) Refer to saliva ejector for high vacuum suction aspirator.

5. Water purifying device

The water purifying device consists of purified water bottle, inlet switch and air/water pipeline system. Uncontaminated water or medical distilled water is put in the purified water bottle for use by high torque/low torque handpiece and three-way syringe. Method of adding water to purified water bottle:

1) Shut off the inlet switch (at bottom of the box) 2) When the blowing sound cannot be heard at the inlet switch, screw off the purified water bottle counterclockwise. 3) After filling up, clockwise screw the purified water bottle and open the inlet switch. It is now ready for use.

Attention: The water outlet pressure of purified water bottle depends on the

pressure of air inlet. Open the ground box cover, check the pressure gauge on the dedicated relief valve, and the reading should be 0.2MPa. If there is any discrepancy, adjust it with the same method as used for the filter relief valve.

6. Switch between municipal water supply and purified water bottle

A switching device between municipal water supply and purified water bottle is set for

this unit (the switch in Fig. 10). The switching can be realized by turning this switch.

7. Setup of the automatic control (Ritter Excellence)

There are different automatic set-up function keys on main controlling board, please

refer to Illustration to set the following operations.

Fig.10 Water purifying device

Switch Air inlet switch

Purified water bottle


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SET

Set

Heating

Chair rising

0 Reset

Mouth Rinsing

Chair Descending

1 Preset position 1

Spittoon washing

Bend backward

2 Preset position 2

Switch of x-ray viewer

Bend forward

3 Preset position 3 AUTO

Automatic

1) Water supply setting of rinsing water

a) Press rinsing water button , the indicating light is on and starts to supply water, when press the botton more than about 3s ,the cue tone is “Beep”,and the rinsing water setting is start .Stop pressing when the water in measuring cup reaches anticipated water level, then the indicating light if off and stops supplying water. Setting is over.

b) After setting, computer will memorize and store, therefore, once press the rinsing water button, it will automatically supply water with such amount when it is used in the future.

Attention: if the tap water pressure changes suddenly and greatly or the dimension of cup changes, please readjust the water supply according to the above steps.

2) Setting of upper limit position

Attention:

Press before setting

a) Press set button SET

until the cue tone is “Beep”, release the SET

,the setting state starts when the indicating light is on.

b) Press Up button until the chair reach the limit position.


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c) Press Backforward button until the backrest reach the limit position.

d) Press the set buttonSET

, the cue tone is stop “Beep” and the indicating light is off. The setting of upper lim

Attention:

The setting of extreme position shall be done by specialized technical personnel so as to avoid the damage of equipment due to improper setting.

The extreme position has been adjusted in place before leaving the factory and there is no need to reset.

Do not set the extreme position optionally.

Last time memory will be deleted after new extreme position be set.

3) Setting of commonly used chair position Three (1, 2, 3) memory positions have been set before release. If three (1, 2, 3)

memory positions need to be set individually, please operate as the following steps: a) Move the seat board and backrest of dental chair to the desired position (a memory position).

b) Press set button SET

first, indicating light will be on and setting state will start.

c) Press 1, then press buttonSET

, indicating light will be off and a desired position

will be set in the memory position of I.

d) Repeat the above steps of a) and b), press 2, then press buttonSET

, indicating

light will be off and a desired position will be set in the memory position of II.

e) Repeat the step of a) and b), press 3, then press buttonSET

, indicating light will

be off and a desired position will be set in the memory position of III.

Attention:

� During automatic operation of electric chair, press any function key to stop operating immediately; � All the set parameters could be automatically stored when the power is off. � If the EPS is power off and then resumed, no danger on safety will be caused except the preset function stops. If you want to continue to operate, please restart the machine.

8. Setup of the automatic control (Ritter Superior)

There are different automatic set-up function keys on main controlling board, please


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refer to Illustration to set the following operations.

SET

Set

Heating

Chair rising

P1 Preset position 1

Mouth Rinsing

Chair Descending


Spittoon washing

Reset


Switch of x-ray viewer

Bend backward

Rinsing position

Bend forward

1) Water supply setting of rinsing water

a) Press rinsing water button , the indicating light is on and starts to supply water, when press the botton more than about 3s ,the cue tone is “Beep”,and the rinsing water setting is start .Stop pressing when the water in measuring cup reaches anticipated water level, then the indicating light if off and stops supplying water. Setting is over.

b) After setting, computer will memorize and store, therefore, once press the rinsing water button, it will automatically supply water with such amount when it is used in the future.

Attention: if the tap water pressure changes suddenly and greatly or the dimension of cup changes, please readjust the water supply according to the above steps.

2) Setting of upper limit position


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Press before setting

e) Press set button SET

until the cue tone is “Beep”, release the SET

,the setting state starts when the indicating light is on.

f) Press Up button until the chair reach the limit position.

g) Press Backforward button until the backrest reach the limit position.

h) Press the set buttonSET

, the cue tone is stop “Beep” and the indicating light is off. The setting of upper lim

Attention:

The setting of extreme position shall be done by specialized technical personnel so as to avoid the damage of equipment due to improper setting.

The extreme position has been adjusted in place before leaving the factory and there is no need to reset.

Do not set the extreme position optionally.

Last time memory will be deleted after new extreme position be set.

3) Setting of commonly used chair position

Three (P1, P2, P3) memory positions have been set before release. If three (P1, P2, P3) memory positions need to be set individually, please operate as the following steps:

a) Move the seat board and backrest of dental chair to the desired position (a memory position).

b) Press set button SET

first, indicating light will be on and setting state will start.

c) Press P1 again, then press buttonSET

, indicating light will be off and a desired position will be set in the memory position of P1.

d) Repeat the step of a) and b), press P2 again, then press buttonSET


e) Repeat the step of a) and b), press P3 again, then press buttonSET



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Attention:

� During automatic operation of electric chair, press any function key to stop operating immediately; � All the set parameters could be automatically stored when the power is off. � If the EPS is power off and then resumed, no danger on safety will be caused except the preset function stops. If you want to continue to operate, please restart the machine.

9. Heating of rinsing water

The unit has the automatic isothermal water heater. Please operate as the following to

get hot water.

Press the heating button of water heater, the indicating light beside button will be

on, and then the water heater will heat automatically till the isothermal state. To close

this system, please press this button again, and the indicating light beside the button will

be off.

Attention: it is heating if indicating light flickers; it has reached preset water

temperature if indicating light is on without flicker.

10. Water supply of rinsing

Press rinsing water supply button to supply water and it will be closed

automatically when it reaches preset water amount.

Attention: during automatic water supply, press this button again will stop water

supply.

11. Water supply of spittoon washing

Press water supply button of spittoon washing to supply water automatically and it

will be closed automatically when it reaches preset time of water supply.

Attention: during automatic water supply, press this button again will stop water

supply.

12. Handpiece operation

Take up turbine handpiece from rack and stamp on air control

feet switch to start it when the turbine handpiece rotates.

13. Saliva ejector and high vacuum suction

The unit has two aspirators including saliva ejector and high vacuum suction. Take up

Fig.11 Feet switch


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saliva ejector or high vacuum suction from rack to operate aspirator.

After using high vacuum suction, impurities will leave inside filter screen cover; therefore

the impurities should be taken out and cleared to prevent the obstruction of high

vacuum suction.

The method of taking out the screen cover is as follows:

a) Rotate spittoon in 90 degree to see filter. b) Pull out filter screen after rotating filter cover, throw away the impurities and put it back after remounting. Make sure to plug it into the bottom to prevent air leaking, and then mount the filter cover.

14. Operation of electric chair

There is spherical feet switch on the base plate of chair.

Press the switch according to the direction of arrow to

complete movements such as rising, descending, backrest

forward and backward, and stop the movement of dental

chair by resetting to middle position. Shift it to right, the

backrest will bend forward; shift it to left, the backrest will

bend backward; shift it forward, the chair will rise; shift it

backward, the chair will descend. Simplex function isn't related to the preset position of

computer casing originally set and each movement will stop automatically when it

comes to extreme position. See Fig.15.

Main control operation board and auxiliary control operation board also have function

key of simplex movement of chair. Press the key to start and undo to stop.

15. Operation of preset position of electric chair (Ritter Excellence)

Press AUTO

key and the indicating light is on, then press for key 1,the chair

Fig.12 High vacuum filter

Filter cover

Filter screen

Fig.16 Feet switch


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will move to the preset position I. When reaching the corresponding preset

position, the indicating light is off and the chair stops moving.

If another preset position is needed, repeat the above operation.

16. Reset button (AM2060A)

After patient sitting on the electric chair or after consulting, doctor could press reset

button to lower the seat to minimum position and enable the backrest to bend forward to

extreme position so that patient can move freely. The specific operation is as follows:

press the automatic keyAUTO

and the indicating light is on. And then press for 0

key. The chair will stop operating and the indicating light will be off when it comes to this

position.

Attention: during operation process, no tangible thing shall be placed within the

operational stroke of the unit.

17. Operation of preset position of electric chair (Ritter Superior)

Press P1once, no matter what position the dental chair or the backrest is in, they will

move to the memory position I. When reaching the preset chair position, the chair will

stop moving.

Repeat the above operation to get into another preset position.

18. Reset button (Ritter Superior)

After patient sitting on the electric chair or after consulting, doctor could press reset

button to lower the seat to minimum position and enable the backrest to bend forward to

extreme position so that patient can move freely. The specific operation is as follows:

press the automatic key . The chair will stop operating when it comes to this

position.

Attention: during operation process, no tangible thing shall be placed within the

operational stroke of the unit.

19. Head rest


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Headrest adjusting knob: the headrest can be

adjusted to required position by screwing the knob

counterclockwise. Screw the knob clockwise, the

headrest will be locked. (Fig.18)

Head holder adjusting button: press the button,

the stop plank of headstock can be moved to

required position easily. Let go the button, it will

be locked automatically. (Fig.18)

Attention: it is not supposed to be used before the confirmation of locking of

head holder after adjusting to prevent accident.

20. Hand rest

Pull right hand rest about 10mm, then push it down, and then the patient can take his

place. Lift it up to reset it to the original place.

Attention: when taking seat, the patient shall sit in the seat frame first, and shall

not sit on the foot plate in case of damage on the chair.

21. Dentist Chair

If it is necessary to lift the seat, the seat can be lifted to appropriate height through

up-lifting of air-driven-spring operation handle by the dentist with feet support the

ground and slight moving-off the seat cushion, and loose the handle to automatically

lock the air-driven-spring.

If it is necessary to descend the seat, the dentist lifts the operating handle upwards and

had better slightly raise feet, and then the seat cushion will immediately descend. Loose

the handle until it descend to appropriate position and it will be locked automatically.

XI. Maintenance After installation and debugging of new equipment, it will be put into use formally. The

day-to-day maintenance of equipment is very important. It will influence the working

stability and the normal working of equipment directly, or even shorten the service life of

equipment and instruments.

1. Water circuit

a) Before using in every morning, open the spittoon washing water to discharge the

sediment and impurities in the tapping pipe.

Knob

Button

Fig.18 Head rest


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b) Clean the water filter regularly. Generally it should be cleaned once per half month.

In the region with poorer water quality, it should be cleaned three times per month.

c) After use, the high vacuum suction and the saliva ejector must suck 200 ml of

clean water to rinse the pipe and the suction pressure generator.

d) For the equipment with purified water bottle, the purified water bottle should be

cleaned regularly. Generally once per week. If it can't be cleaned, please replace it with

a new one.

e) Before off duty everyday, flush the sewer pipe by pouring 5l of clean water into the

spittoon quickly to keep the sewer pipe clear.

2. Air circuit

a) Check for seeper in the organic glass of air filtration relief valve weekly. Check

whether the pressure is 0.5MPa. Remove the seeper in the glass and adjust the relief

pressure in time.

b) Check for the working conditions of air compressor weekly. The normal working air

pressure should be between 0.55-0.8MPa. Discharge the seeper in the air tank of

compressor.

3. Mechanical structure

a) After end-of-job everyday, the chair must be put to reset position. The power, water

and air switch must be shut off.

b) All moving joints should be lubricated every 3 months. The lead screw of motor

must be greased.

c) All fastening screws, bolts and circlips should be inspected every 6 months.

Preservative oil should be applied after inspection.

4. Handpiece

a) Handpiece is a delicate device, so it shall not be pounded or dropped. It shall be

cleaned and lubricated with special detergent and lubricant every day. As for the specific

method, refer to the instruction manual of handpiece.

b) The cleaning and sterilization methods shall be based on the recommended

methods by manufacturer of handpiece. Oil spray lubrication shall be conducted before

high temperature sterilization.

c) Observe the working pressure of the handpiece regularly, which should not be too


26

high or too low. When it exceeds the standard, adjust it in time.

d) The pressure of the needle on the teeth should not be excessive, otherwise the

miniature bearing will be damaged.

e) Change the needle regularly. Obtuse needle will damage the handpiece bearing.

The sharpness of the needle must be checked every time before grinding teeth.

Generally the needle should be renewed after grinding 4-5 teeth.

f) Before HTHP sterilization, rinse, lubricate and oil the handpiece, package it with

special sealing bag and put into HTHP sterilizer.

The Attachment 1 is the method recommended by us for reference.

5. Water filter

The unit has water filter to ensure its normal use. After serving a certain time, the dirt will

block the filter core and affect the water flow, therefore, it is necessary to clean and

replace the filter core. The filter core shall be cleaned and replaced under any of the

following conditions:

� It has been used for over half a year. (Depend on the local water quality) � The hydraulic pressure loss after filtering is above 0.1MPa. � Filter core is contaminated. � The extracted water becomes turbid suddenly. The specific cleaning method is as follows: open the ground box cover first,

counterclockwise rotate and dismount water filter cover to remove filter core. Clean it

with the ultrasonic or neutral detergent, wash it with tap water thoroughly after cleaning

and then mount water filter cover.

6. Relief valve of air filtration After the filtration through the air-filtration relief valve, moisture content and impurity will

be reserved in the filter cup, which must be removed; otherwise, they will seriously

Fig.19 Water filter

Water filter Water filter

cover Filter core


27

affect the curative effect. Usually, it is necessary to

discharge filtration relief valve under any of the

following conditions:

� It has been used over one week. � The water in filter cup accounts for three-quarter of volume. � The color of water in filter cup changes (it isn't transparent). The specific method of discharging filtration relief

valve is as follows: unscrew drainage valve.

7. Saliva ejector and high vacuum suction Besides the maintenance of their exterior

cleanness, the cleanness of interior pipeline system of saliva ejector and high vacuum

suction still need to be maintained. The method of cleaning pipe system is as follows:

regularly pump clear water or special sterilized water about 30s with recommended 1 or

2 times every day.

8. High vacuum filter screen Regularly clean the sediment in the filter screen of high vacuum filter. As showed in Fig.

18, when cleaning, take out filter screen, clean it with small brush, rinse it out and then

mount it in turn according to the diagram.

9. Operating light The operating light needs to be maintained

regularly. The light housing and mirror

surface need to be cleaned.

a) Light housing: unscrew the setscrew of light housing and take it down to clean it thoroughly. b) Mirror surface: dip a little anhydrous alcohol with soft absorbent gauze, slightly wipe and clean interior paraboloid; blow way the dust on exterior paraboloid with compressed air. Replacement of bulb: close operating light, take down the light housing and heat shield after the lamp is fully cold, then replace with a new bulb; reverse the above order, mount the heat shield and light housing reliably.

Fig.20 Relieve valve assembly of air filtration

Knob

Discharge valve

Filter cup

Discharge pipe

Fig.21 Operating light

Light housing

Heat shield

Bulb


28

10. Fuse The fuse is in the ground box of dental chair. The method of replacing fuse is as follows:

cut off the power, counterclockwise screw off the fuse holder to take out the fuse and

replace with a new one, then clockwise screw it up.

XII. Cleaning and sterilization After a period of using, it is necessary to clean and sterilize the equipment regularly.

1. Handpiece Please refer to the enclosed instruction manual of handpiece for its sterilization.

a) Clean the surface of dental drill with alcohol cotton. b) Blow it with clean lubricating oil for 2-3s. c) Wrap it with sterilization package. d) High-temperature steam sterilization (135°, 15mi n, 220KPa).

2. Other instruments a) High-temperature steam sterilization (135�, 15min, 220KPa) should be used for

three-way syringe. b) Disposable suction nozzle should be equipped with saliva ejector. Throw away the

suction nozzle after treating each patient and replace with a new one before the

treatment of next patient.

c) Put the high vacuum suction nozzle in high temperature sterilization box of 134� to

sterilize it for four minutes.

3. Exterior accessories a) Spittoon: wash it with clear water first, then sterilize it with alcohol.

b) Instrument tray: wash it with clear water first, then sterilize it with alcohol.

c) Dental chair: clean and sterilize it with leather detergent and medical alcohol.

XIII. Troubleshooting No. Symptom Cause Solution

1

When it is used frequently, the dental chair doesn't operate suddenly, while the control system is under normal operation.

The motor is overheated and stops operating.

After stopping for a while, it could continue to operate properly.

2

The saliva ejector or high vacuum aspirator could operate only by opening general air valve.

The mounting position of rack valve changes.

Open the rear cover of rack, adjust the front and back mounting position of rack valve until it stops when putting down the instrument and operates when taking up the


29

No. Symptom Cause Solution instrument.

3

The suction of saliva ejector and high vacuum aspirator is small or without suction.

1. The pressure of tap water is too low. 2. The water filter is blocked. 3. Pressure of supply gas is too low. 4. Negative pressure generator is blocked. 5. The pipeline and joint leak.

1. Install supercharge water pump if the water pressure is too low. 2. Clean the water filter and replace filter core. 3. Adjust supply gas pressure to 0.5MPa. 4. Dismount and wash negative pressure generator, remove the blocking. 5. Check the pipeline and joint.

4 No water in handpiece.

1. The jet hole of

handpiece is blocked.

2. The water filling switch

of foot control air switch

isn't open.

3. The water regulating

valve of handpiece isn't

open.

1. Dredge the jet hole of

handpiece.

2. Shift the water filling switch of

foot control air switch to the right.

3. Open the water regulating

valve of handpiece and adjust it

properly.

5 The handpiece isn't powerful or doesn’t operate.

1. The operation air

pressure of handpiece is

too low.

2. The bearing of

handpiece is damaged.

3. The dental bur is worn

or isn't clamped tightly.

4. The pipeline of

handpiece is blocked.

5. The air pipe inside

handpiece leaks.

1. Adjust the operation air

pressure of handpiece according to

instruction manual.

2. Replace the bearing of

handpiece.

3. Replace with a new dental

bur and then clamp the dental bur

tightly.

4. Dismount bearing assembly

and dredge the pipeline of

handpiece.

5. Replace the housing of

handpiece.

6 The button of three-way syringe leaks.

O-ring is worn or aging. Replace O-ring and add silicon grease oil to lubricate.

7 The three-way syringe doesn’t sufficiently spray vapor.

1. The water-pipe and

air-pipe of three-way

syringe is connected

oppositely.

2. The water of

three-way syringe is too

strong or the air is too

weak.

1. Exchange the water-pipe with

the air-pipe of three-way syringe.

2. Adjust the water and air of

three-way syringe.

8

Rinsing water and spittoon washing water are too few or without water.

1. The water pressure is

too low.

2. The water filter is

blocked.

1. Install supercharge water

pump if the water pressure is too

low.

2. Clean the water filter and


30

No. Symptom Cause Solution

3. Pressure of supply

gas is too low.

4. Electromagnetic valve

doesn't work.

5. The connecting wire

and connector don't

contact properly.

6. The circuit board

breaks down.

7. The control keyboard

doesn't contact properly.

replace filter core.

3. Adjust supply gas pressure to

0.5MPa.

4. Replace the damaged

electromagnetic valve.

5. Find out the contact failure

position of connecting wire and

reconnect it.

6. Replace defective circuit

board.

7. Replace control keyboard.

9 The treatment unit

doesn't operate.

1. The power plug isn't

properly plugged or doesn't

properly contact.

2. The power fuse is

blow-out.

3. The transformer of

ground box is damaged.

4. The power switch is

broken.

1. Replace power plug or outlet.

2. Find out the reason of

blow-out first and replace power

fuse.

3. Replace the transformer of

ground box.

4. Replace power switch.

10 No water in treatment unit.

The water filter is blocked. Water pipe is pinched.

Clean filter core. Remove the pinching source.

11 There is water spraying out from the air.

1. The joint of handpiece isn't screwed tightly. 2. The filter relief valve is full of water.

1. Screw the joint of handpiece tightly. 2. Discharge the accumulated water inside filter relief valve.

12 The operating light

isn't on.

1. The bulb of operating

light is broken.

2. The connecting wire of

operating light doesn't

properly contact.

3. The switch of

operating light doesn't

properly contact.

4. The lead wire of

ground box transformer

doesn't properly contact.

1. Replace a new bulb.

2. Find out the defective

connection position.

3. Replace the switch of

operating light.

4. Reconnect the lead wire of

ground box transformer or replace

the transformer of ground box.

13

The chair doesn’t

move, the warning

tone is normal, and

other keys work in

order.

1. The relay contact is

poor or the coil is

damaged.

2. The motor is broken

or the circuit is open.

1. Clean the relay contact or

replace it with a new relay.

2. Find the open circuit, connect

it again or replace the motor.

14 The x-ray viewer isn't

on.

1. The fuse is blow-out.

2. The lamp is broken.

1. Replace the fuse.

2. Replace the lamp.


31

No. Symptom Cause Solution

3. The PCB is broken.

4. The connecting wire

doesn't contact properly.

3. Replace the PCB.

4. Repair the contact failure

position of the connecting wire.


32

XIV. Analysis on air/water pipeline system


33

The Ritter excellence & Ritter Superior chair-mounted dental unit adopts the air/water

pipeline system combining air control with electric control. Before working, the master

air switch must be turned on to open air flow and send purified water into the instrument

tray for use by handpiece, scaler and three-way syringe.

1. Handpiece pipeline

The air/water pipelines of two high torque air turbine handpieces and one air motor

handpiece are similar. We analyze them with the left high torque handpiece as an

example:

Usually, after the handpiece is put into the rack, press the button of rack valve and the

relevant rack valve is on. The diaphragm valve is shut now.

During use, for instance:

(1) Take up the handpiece at left side, the button of rack valve bounce up and the

relevant rack valve is off. The diaphragm valve is open now.

(2) Step on the air control feet switch.

The cooling air and driving air/water will enter the four-hole handpiece through air/water

regulating valve from the outlet of diaphragm valve, which makes the handpiece rotate

at high speed and jet cooling water spray to work.

2. High vacuum suction pipeline

The working air flow of high vaccum suction and saliva ejector is shut by the rack valve.

When taking out the handle of high vacuum suction or saliva ejector from the rack, open

the rack valve and then begin to work.

Diaphragm valve is open

Air flow into control end is cut off

Air inlet Rack valve Diaphragm valve control end

Feet control air switch Cooling air

Control cooling air

Open air control water valve

Diaphragm

valve

HP


34

1 High vacuum suction generator 2 Saliva ejector generator

3 Electromagnetic valve for mouth rinsing and spittoon washing 4 Heater

After the air flow enters the high vacuum suction pressure generator, strong suction

pressure is generated to suck the solid or liquid spitted matters from the mouth of

patient into the filter. After filtration, the waste solid and liquid is sucked into suction

pressure generator and flow to the sewer together with the air flow.

The principle of operation of saliva ejector is similar with that of high vaccum suction.

The only difference is that the suction pressure generator of high vaccum suction

generates suction pressure with air flow, while the suction pressure generator of saliva

ejector generates suction pressure with water flow. Therefore, the tap water must have

a pressure of 0.2-0.4MPa.

The suction pressure generated from water inflow will suck the water, saliva or blood in

the mouth of patient into the suction pressure generator and discharge them to the

1111 2222 3333 4444


35

sewer together with the water flow.

3. Mouth rinsing and spittoon washing pipeline

The mode of controlling the air control valve with an electromagnetic valve (EV) is

adopted for the mouth rinsing/spittoon washing pipeline. Press the mouth rinsing or

spittoon washing key, the electromagnetic valve will open the air control water valve,

and the mouth rinsing water and spittoon washing water will flow out from the air control

water valve.

EV

Air control water valve Water Heater

Mouth rinsing

EV

Air control water valve

Water Spittoon washing


36

XV. Analysis on electrical control system

334 4

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20V

24V

230V

6 7 12(9

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13(1

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37

1. Dental chair part

The core of dental chair lift motor and backrest rotation motor control system is CPU.

CPU keeps on scanning and testing the on-off state of each inching switch in dental

chair feet switch and classifies these information into commands such as set, reset,

rising, descending, bend forward and bend backward. It will analyze and process these

commands comprehensively, exclude illegal commands under certain condition (e.g.,

command of rising and descending at the same time), and send legal command to

control the lift motor and backrest motor through the output port.

1) Preset position control

During rotation of motor, CPU keeps on memorizing the impulse information fed back

from motor (such as number of revolutions and direction of motor) in the chip. Whatever

position the dental chair is at, once a control key is pressed, such as "preset I", "preset

II" or "preset III", the dental chair can be run to relevant preset position automatically at

once.

2) Reset control

After pressing the reset key, the two motors will rotate at the same time to descend the

chair position and bend the backrest forward. During rotation of motor, the CPU keeps

on detecting the on-off state of limit switch, and once reaching the limit position, the limit

switch is on, the CPU sends a command immediately to stop descending or bending

forward, and the chair will rise or bend backward a little.

3) Instrument tray and box part

a) Spittoon washing and mouth rinsing

The core of electrical control system for instrument tray and box part is also the CPU.

The CPU keeps on detecting the command of mouth rinsing and spittoon washing from

diaphragm switch and will judge whether it is a set command or a operation command

according to the length of pressing time.

No matter which command it is, the clock inside the computer is always working and

timing. If it is a set command, the computer will store the time for spittoon washing or

mouth rinsing into the chip. If it is a operation command, the computer will take out the

data in the chip as the basis for timing for water out, and once it is the time, the water

valve is shut off.

b) Constant-temperature heating of water heater

The on-off state of heater power supply will be switched according to the command of


38

heating key. There is a temperature control relay on the heater for mouth rinsing water

heating and thermostatic control. If the temperature is out of control for certain failure,

the power supply will be cut off automatically to keep it safe.

Documents

Ritter Excellence Chair-mounted Dental Unit · The dental chair is the continuous running of interval loading, and its running/interval time is 2min/18min. The operation of heater