Operating instructions for G 7781 DENTAL Thermal Disinfector · Dental Thermal Disinfector. Critical in-struments are used to penetrate soft tissue or bone, e.g. forceps, scalpels,

Operating instructions forG 7781 DENTALThermal Disinfector

To prevent accidents and reduce the risk of damaging

ö]the machine, read these instructions before installingor using the machine. M.-Nr. 04 701 092

ContentsGuide to the machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Help to protect our environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5IMPORTANT SAFETY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6IMPORTANT SAFETY INSTRUCTIONS (detachable) . . . . . . . . . . . . Centre pagesIndications for use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Setting the water softener . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Opening and closing the door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Loading and unloading the machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Adding rinsing agent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Setting the dosage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Adding neutralizing agent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Adding detergent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22Program Chart G7781 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Turning the machine on and off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Selecting a program. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Selecting an additional program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Program sequence indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28Interrupting a program. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28Programming special functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29Reactivating the water softener . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31Cleaning an care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Correcting minor problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39Plumbing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Contents

2

Guide to the machine

1 ”Check water inlet/drain”indicator light

2 ”Reactivate water softener”indicator light

3 ”Add liquid detergent”indicator light(only where special DOS module isconnected externally)

4 ”Add neutralizing agent”indicator light

5 Program sequence indicator light

6 Indicator display field

7 Door release

8 On-Off button

9 Program selectors


3

10 Connection for despenser pumpDOS C 60 (rear)

11 Filter combination

12 Dispenser for powder detergent

13 Salt reservoir (water softener)

14 Dispenser for liquid rinsing agentwith dosage selector

15 Rinsing agent level indicator

10 11 12 13 14 15


4

Help to protect our environmentDisposal of the packaging material

The transport and protective packa-ging is mostly manufactured from thefollowing reusable materials:

corrugated paper/cardboard

polystyrene (CFC-free)

polyethylene foil (transparent)

untreated wood

Rather than throwing these materialsaway, please take them to the nearestrecyclables collection point.

Disposal of your old machine

Old machines contain materials whichcan be recycled. Please contact yourlocal scrap merchant about potential re-cycling options before disposal.

When disposing of an old machine,make sure the door catch is removed.This will prevent children at play frombeing accidentally locked in.

Help to protect our environment

5

IMPORTANT SAFETY INSTRUCTIONSWhen using an electrical appliance, basic precautions should always be followedincluding the following:

READ ALL INSTRUCTIONS BEFOREUSING THE APPLIANCE

WARNING –The manufacturer cannot accept responsibility for damage causedwhen the appliance is not used according to the instructions, or foruses other than those for which itwas intended.

This special commercial machineis suitable for the applications men-

tioned in the operating instructions. Donot use for purposes other than thosefor which it was designed, as thesemay be dangerous. The manufacturercannot be held responsible for damagecaused by improper use.

Do not allow small children or un-authorized personnel access to

the machine or its controls.

If thermal disinfection is required(93ºC/200ºF/10min.), the process

needs to be checked and documentedregularly. This can be done by check-ing the disinfection control diode on themachine. Alternatively, a chemical indi-cator may be used (e.g. the Disinfec-tion Control Tubes by A. Browne Ltd.,supplied by Miele). These disinfectioncontrol tubes should be placed in the filter combination. After the disinfectioncycle, they may be inspected by remov-ing the coarse filter.

The disinfection program shouldnot be interrupted, as this would

affect the disinfection result. If interrup-tion is necessary, the program shouldbe repeated.

Do not install the machine in areaswhere there is a risk of explosion.

IMPORTANT SAFETY INSTRUCTIONS

6

The machine is built in accordancewith current safety requirements.

Any repair work should only be carriedout by a suitably qualified and compe-tent engineer. Repairs by unqualifiedpersons could be dangerous.

The electrical safety of this ma-chine can only be guaranteed if

connected to an electrical system thatcomplies with all local and nationalregulations. It should be checked by anexpert if necessary. The manufacturercannot be held responsible for damagecaused by incorrect wiring.

The machine should only be in-stalled by a suitably qualified and

competent contractor. Before connect-ing the machine, the installer shouldcheck that the voltage and frequencyof the electrical supply correspond withthe details on the data plate of the ma-chine.

Only genuine Miele parts or acces-sories should be used with the

G 7781 Dental Thermal Disinfector. Theperformance and safety of non-genuineparts or accessories cannot be guaran-teed, and use of such parts or itemsmay void the machine warranty. If youhave specific questions about machineoptions or accessories, please callMiele.

The use of Neodisher cleaning,neutralizing, and rinsing agents is

strongly recommended. The use of anyother products may invalidate the disin-fection results and the manufacturer’swarranty.

The machine is completely isolatedfrom the electricity supply only

when it is unplugged or the circuitbreaker is turned off. This must bedone before any repair work is carriedout.

The water in this machine must notbe used as drinking water.

Only use detergents which havebeen approved of by Miele. Do not

use solvents in your machine as theremay be a danger of explosion.


7

Take care when handling liquidssuch as detergents, rinsing or neu-

tralizing agents. These may containacids or alkalis. Follow the instructionsand safety procedures on the packa-ging carefully and wear protectivegloves and goggles. Read the MaterialSafety Data Sheets.

Avoid inhalation of powdercleaners.

Empty any containers or glasswarebefore placing it in the machine.

Do not allow any acids or solvents, especially hydrochloric acid andchlorides, to get into the wash cabinet.

Be careful when sorting instru-ments with sharp pointed ends. If

possible, place the pointed end down-wards.

Install special inserts in accord-ance with the instructions provided.

When using the machine be care-ful not to scald or burn yourself.

Baskets and inserts must first beallowed to cool down. Any water whichmay have collected in incorrectlyloaded items will be very hot andshould be emptied into the washcabinet.

Do not touch the heating elementsafter the end of a program. You

could burn yourself.

Do not hose the machine down toclean it.

Do not sit or lean on the open door.This could cause the machine to

tip and be damaged.

When disposing of an old ma-chine, make sure the door catch is

removed. This will prevent children atplay from being accidentally locked in.


8

All relevant safety proceduresshould be obeyed. Relevant safety

procedures include, but are not limitedto, the Centers for Disease Control’sRecommended Infection Control Prac-tices for Dentistry and the OSHA Blood-borne Pathogens Standard.

The manufacturer cannot be held responsible for damage caused byfailure to heed the warning andsafety instructions.

SAVE THESEINSTRUCTIONS


9

Indications for useHigh-level disinfectionThe G 7781 Dental Thermal Disinfectoris suitable for automatic treatment ofdental instruments and accessories. Itcleans and when using the disinfectionprograms simultaneously thermally dis-infects at 200ºF/93ºC instruments andaccessories.

Areas of effectiveness are physicalremoval or thermal inactivation of vege-tative bacteria including mycobacteria,fungi, fungal spores, and viruses.These categories include the Mycobac-terium tuberculosis and the Entero-coccus faecium.

Important: Only the programs labeled‘DISINFECTION’ disinfect! Only usethese programs when handling con-taminated items. All other programs aredesigned to clean items without disin-fecting them!

All relevant safety procedures shouldbe obeyed. Relevant safety proceduresinclude, but are not limited to, theCenters for Disease Control’s Recom-mended Infection Control Practices forDentistry and the OSHA BloodbornePathogens Standard.

The G 7781 Dental Thermal Disinfectorachieves high-level disinfection asdefined by the Spaulding categoriza-tion.

The Spaulding category high-level dis-infection is the same type of means asin the sterilant category except that theuse pattern is different. The sterilant isused as a high-level disinfectant bye.g. reducing the exposure time withinits effective range of tuberculocidal,virucidal, and bactericidal action.

According to the Centers for DiseaseControl’s Recommended InfectionControl Practices for Dentistry ,instruments should be classified in oneof the following categories and betreated accordingly:

All critical instruments must be ste-rilized after treatment in the G 7781Dental Thermal Disinfector. Critical in-struments are used to penetrate softtissue or bone, e.g. forceps, scalpels,bone chisels, scalers, or burs.

Semicritical instruments should besterilized after treatment in the G 7781Dental Thermal Disinfector. If, however,sterilization is not feasible because theinstrument will be damaged by higherheat exposure, the instruments may betreated terminally in the G 7781 DentalThermal Disinfector. Semicritical instru-ments do not penetrate soft tissues orbone but contact oral tissues, e.g. mir-rors and amalgam placement instru-ments.

Noncritical instruments may betreated terminally in the G 7781 DentalThermal Disinfector. Noncritical instru-ments or devices come into contactonly with intact skin, e.g. external com-ponents of x-ray heads.

Indications for use

10

Instruments suitable for processing in the thermal disinfectorAll instruments, accessories, and otheritems to be cleaned and disinfected inthe G 7781 Dental Thermal Disinfectorshould have the following properties:

heat resistance to a temperature ofup to 95°C/203°F

corrosion resistance in the presenceof heat and alkalinity.

The high heat retention capacity ofstainless steel allows for fast drying.Plastic has a lower heat retention ca-pacity, thus needing a longer dryingtime. In this case, a slightly extendedwaiting period after the disinfectioncycle of 5 - 15 min. may be necessary.

Aluminum discolors using the programDISINFECTION 93°C-10’. It may dis-color using the program DISINFEC-TION VARIO 93°C-10’. Aluminum onlyhas a limited suitability for processingin this system.

Carbon steel may corrode in the pro-cess. Please try the corrosion resist-ance of carbon steel instruments withinitially one instrument, or do not pro-cess carbon steel items at all. If you doprocess carbon steel items, the pro-gram DISINFECTION VARIO 93°C-10’should be used.

Handpieces, drill bits, grinders, rootcanal instruments or other rotating in-struments only have a limited suitabilityfor the thermal disinfector. Please askthe manufacturer’s advice on the suita-bility for processing in this system.

Do not clean fiberoptics or electricalequipment or components in the ther-mal disinfector.

Rhodium coated specula must be ar-ranged so that their surfaces do not suf-fer any mechanical damage. Not allspecula with glass are suitable for ma-chine treatment.

In case you have any questions regard-ing the suitability of instruments forbeing processed in the G 7781 DentalThermal Disinfector, please ask the in-strument manufacturer’s advise.

Cleaning without disinfectionAll other programs are designed toclean goods without disinfecting them.These programs are:

Rinse

Wash 93°C

Please refer to ”Program selection” fordetailed information.

Indications for use

11

Setting the water softenerTo avoid the build-up of calcium de-posits on items being cleaned and inthe machine, the water may need to besoftened (where the supply hardnessexceeds 107 ppm CaCO3).

To ensure a steady supply of soft waterthe water softener must always be:

1. correctly set

2. regenerated with salt as soon as the”Reactivation” indicator light comes on.

The water softener should be set tocorrespond with the water hardnessupon installation of the machine.

Your local water authority can adviseyou on the water hardness in your area.

Setting the water softenerThe hardness range is divided into 18units and a zero position. The machineis set at the factory for a water hard-ness setting of 8, corresponding to 339ppm CaCO3. If your water supply is har-der or softer than this, the setting of thecontrols should be changed. Find the”Display Field” number correspondingto your local water hardness in thetable.

Dis-playField

gr/gal mmol/l ° fH °eH ppmCaCO3

181716151413121110 9 8 7 6 5 4 3 2 1 0

6 7 8 91011121315171922242832384871

1.071.251.421.601.781.962.142.312.673.033.383.924.274.985.706.768.54

12.64

10.712.514.316.017.919.621.423.226.830.433.939.342.850.057.167.885.7126.7

7.5 8.810.011.312.513.815.016.318.821.323.827.530.035.040.047.660.188.9

1071251431601791962142322683043393934285005716788571267

Press the ”Drain” and ”Drying” touchpads simultaneously and, while de-pressed, turn the machine on, usingthe main ”On/Off” switch.”P…” will appear in the indicatorpanel.Press the ”Reactivation” touch pad.The ”P…” will disappear and setting”0” will appear in the display field.This setting ”0” can now be changedif necessary. To do this:Press the ”DRYING” touch pad asmany times as necessary for thedesired value to appear in the dis-play field.Press the ”START” touch ad. ”SP” ap-pears in the display field.Press ”START” once more. The set-ting will now be stored. The displayfield clears.The machine is now ready for oper-ation.

Setting the water softener

12

If the water hardness in your area ispermanently below 107 ppm CaCO3,you do not need to soften the water.Please deactivate the water softener by:

Selecting the setting ”0” in the dis-play field according to above instruc-tions. The ”REACTIVATION” controllight will not come on and the watersoftener will not need to be reacti-vated.

For instructions on reactivating thewater softener , see page 30.

Setting the water softener

13

Opening and closing the doorTo open the door

press the ”DOOR” button on the con-trol panel and open the door.

The door should only be opened dur-ing operation for emergencies, e.g. ifarticles are knocking together. If this oc-curs in the disinfection program, restartthe complete program.

To close the doorlift the door upwards and push until itclicks into position. Do not press the”DOOR” button.

Opening and closing the door

14

Loading and unloading the machineThe disinfector normally uses an upperand a lower basket.

Depending on the type and shape ofthe items being cleaned, inserts can besupplied.The diversity of the inserts is so greatthat it is not possible to illustrate themall or give detailed instructions on theiruse here.E.g. the thermal disinfector will allowhollow instruments to be internallycleaned and disinfected using theupper basket O 177.

Removing excess soils

Empty all items to be cleaned beforeloading into the machine.

Ensure that no acid or solventresidues, especially hydrochloricacid or chlorides, get into the washcabinet.

Notes

Load the items to be cleaned so thewater will come into contact with allsurfaces. This ensures that they willbe properly cleaned and disinfected.

Hand instruments should be pro-cessed in cassettes like the E 146, E 363, or E 373.

Hinged instruments should beplaced into the universal mesh tray E378 or E 379 with the hinge openedat an angle of about 90° (right angle).

Hollow instruments should betreated in the upper basket O 177,and be positioned on jets or funnels.

Do not place items to be cleaned in-side other pieces where they may beconcealed.

Vessels should be inverted andplaced in the correct inserts.

Deep based items should be placedat enough of an angle for water torun off them freely.

Tall and narrow pieces should beplaced in the center of the basket toensure good coverage with water.

Hollow instruments may only be pro-cessed correctly, i.e. cleaned anddisinfected inside and outside, in theappropriate upper basket O 177.

The spray arms must not be blockedby items which are too high for thebasket or which hang down in itspath. If necessary, manually rotatethe arm to test it.

The flap of the powder detergent dis-penser on the door must not be ob-structed and be prevented fromopening when the door is closed.

In order to avoid corrosion, it is rec-ommended that only heat and corro-sion resistant items be cleaned inthe machine. For the suitability ofinstruments, please refer to ”Indi-cations for use”.

Care should be taken that as littledental cement or amalgam remainson the instruments as possible. How-ever, where necessary, the instru-ments can be cleaned manually afterthermal disinfection (following healthand safety regulations) with mi-nimized danger of infection.

Loading and unloading the machine

15

Use thermally stable plastic itemsonly.

Immediately after the program finishes, partially open the door(about 4 inches or 10 cm) for 10 to15 minutes. This allows the goods tocool down to avoid burning or scald-ing. Additionally, good drying resultsare achieved using the residual heat,which will help prevent the instru-ments from corroding. Aluminiumtrays are usually not suitable for ther-mal disinfection.

Handpieces, drill bits, grinders, rootcanal instruments or other rotating in-struments only have a limited suita-bility for the thermal disinfector.Please ask the manufacturer’s ad-vice on the suitability for processingin this system.

Do not clean fiberoptics or electricalequipment or components in thethermal disinfector.

Important

Make sure the spring loaded couplingengages correctly when the upper bas-ket is inserted into the machine. Thereshould be a tight fit between the coup-ling and the water inlet connector at thetop of the chamber. If there is not, ad-just the adapter as follows:

Loosen the holding ring on the upperbasket.

Push up the adapter so it is 1/4’’higher than the water inlet connector,and tighten the holding ring.

Select baskets and inserts which areappropriate for the application.

Disinfection monitors

Although the adhesion to the thermaldisinfection parameters (93°C/200°F/10 min. +/-2°C) is monitored by theelectronic control, we advise to inde-pendently check the unit once a daywith the first run.

The Disinfection Control Tubes by A.Browne Ltd., distributed by Miele, aredesigned to monitor the time tempera-ture combination of 93°C/200°F/ 9min.They may be placed in the filter combi-nation. These indicators change colorwhen the parameters are met. Althoughthis indicator does not indicate theexact disinfection parameters, they willalert the user to large discrepanciesfrom them.


16

Loading and unloading the machineLoading examples

Upper basket O 177

The upper basket O 177 features 28jets/funnels for direct injection of hollowinstruments like syringe tips or evacu-ation tips. The left side is free for alter-native inserts.

Place hollow instruments directly ontothe jets. Where the inner diameter ofthe hollow instruments does not allowfor positioning onto the jets, the jetsmay be replace by funnels.

Bottom basket U 165

Left hand side: insert E 131 for 5 meshtrays (E146) and holders (E 328) fordouble sided instruments. Right handside: E 130 insert for 10 trays.

Bottom basket U 174 insert

Left hand side: E 130 for 10 trays. Right hand side: E 379 universal meshtray for various instruments.


17

Unloading the machineWhen the cycle is finished the indicatorlight next to the ”START” touch pad willgo out.

If one of the ”DISINFECTION” pro-grams was chosen, check the ”DIS-INFECTED” indicator light. If it is notlighted, the load is not disinfected! Inthis case please call technical assist-ance.

Check, if any warning lights (lefthand side of the control panel) areon, or if the digital display shows twodashes. If so, refer to the section”Correcting minor faults”, or call tech-nical assistance.

In case you used a disinfection moni-tor (disinfection control tubes),check for the accuracy of the pro-cess. We advise to document the re-sults.

Open the door partially (about 4’’ /10 cm). Let the load cool down forabout 10-15 min. During this time theload will usually dry out.

In case you use powder detergentcheck, if the dispenser lid has op-ened. If not, the instruments mightnot be clean!

In case you use rinse aid check thesmall bulls eye on the right handside of the inner side of the door. Ithas to be black. If not, replenish theliquid door dispenser with rinse aid.

Now you can safely unload the ma-chine.

Adjusting the top basketAdjustable top baskets can be used inthis machine. They can be raised or lo-wered by 3/4’’/2 cm from the initial set-ting.

In the middle position the basket willaccommodate:

instruments, utensils, accessories andinserts up to 7 1/2’’ / 19 cm in height

while the lower basket can accommo-date:

instruments, utensils, accessoriesand inserts up to 9 3/4’’ / 19 cm inheight.

For further details regarding con-tainer height combinations, see tablebelow.

Topbasketposition

Top basketheight cm

Bottom basketheight cm

top 6 5/8" (17 cm) 10 5/8" (27 cm)

middle 7 1/2" /19 cm) 9 3/4" (25 cm)

bottom 8 1/4" (21 cm) 9" (23 cm)

To adjust the top basket

Pull out the upper basket until a re-sistance is felt, lift from the runnersand remove.

Unscrew the knurled nuts on bothsides of the basket and reposition asnecessary.


18

Adding rinsing agentA storage container incorporated in thedoor has a capacity of approximately7.8 fl.oz. / 200 ml. The required amountof appropriate liquid rinsing agent (Neodisher MielClear) is dispensedautomatically from this container.

Adding rinsing agent

Unscrew the cap

Pour rinsing agent into the storage con-tainer until the level indicator is dark(see arrow in illustration). Use funnel ifnecessary.

Firmly tighten the screw cap. Cleanup any spillage.

Refilling with rinsing agent

The level indicator shows how muchrinsing agent is left in the container.When there is no dark coloring visiblein the level indicator, the containerneeds to be refilled.

Setting the dosage

The dosage adjustment in the openinghas settings from 1-6 (0.035-0.2 fl.oz. /1-6 ml). It is set to ”3” (o.1 fl.oz. / 3 ml)at the factory.

Use a higher setting if spots are lefton the cleaning goods after drying.

If smearing appears, use a lower set-ting.

Adding rinsing agent

19

Adding neutralizing agentTo reduce the pH level of the wash solu-tion after the alkaline phase, specialneutralizing acids will be used in thefirst interim rinse.

Place the container with neutralizingagent on the floor close to the ma-chine.

When the ”NEUTRALIZER” indicatorlight on the control panel lights up

fill the container with neutralizingagent, or change container, and then:

place the siphon tube firmly in theopening of the free-standing con-tainer (pay attention to the color cod-ing).

The container should never be allowedto empty.

Adding neutralizing agent

20

Adding neutralizing agentVenting the liquid dispensing system

Before using the machine for the firsttime, or if the container has beenallowed to empty, the dispensing sys-tem must be vented. Please proceedas follows:

Press the ”ON/OFF’ button.

Use a sharp object to press in switch”A” and/or ”B” at the left hand sideend of the control panel for three anda half minutes.Switch ”A” Dispensing system forneutralizing agent.Switch ”B” Dispensing system forcleaning agent.Each time the system is vented anyliquid which runs into the washcabinet must be washed out as fol-lows:

Select the ”RINSE” program.

After this has run the dispensing sys-tem is filled and ready for use.

Adding neutralizing agent

21

Adding detergentPour powder detergent into the powderdispenser on the door before each pro-gram (see next page for ”DISINFEC-TION’ program).

Pull the opening catch on the con-tainer flap forward (see arrow). Theflap will spring open (the flap will re-main open at the end of a program).

Fill the dispenser with the detergentmanufacturers recommended dos-age. When calculating the dilutionratio of the detergent, 10.5 liters isthe amount of water that is used themain wash cycle (For example, if 3g/l dilution is required use about 30 grams of detergent).

Close the dispenser lid.

Use only specially formulated clean-ing agents which are approved of byMiele.

Under certain circumstances, differ-ent additives may be necessary.Miele Customer Service will beplease to advise you.

Note

Take care when handling liquids suchas detergents, neutralizing agents orrinse aids. These may contain acids oralkalis. Follow the manufacturer’s safetyprocedures and the instructions on thepackaging carefully. Wear protectivegloves and goggles if necessary.

Adding detergent

22

IMPORTANT SAFETY INSTRUCTIONSG 7781

To the person responsible for the machine:

Make this pull-out with the Warning and Safety Instructions available to any operators of the machine. Place it near the machine, where it can be seen.

Ensure that operators know and understand these Warning and Safety Instruc-tions, and observe them in use.

When using an electrical appliance, basic precautions should always be followedincluding the following:

READ ALL INSTRUCTIONS BEFOREUSING THE APPLIANCE

WARNING –The manufacturer cannot accept responsibility for damage causedwhen the appliance is not used according to the instructions, or foruses other than those for which itwas intended.

This special commercial machineis suitable for the applications men-

tioned in the operating instructions. Donot use for purposes other than thosefor which it was designed, as thesemay be dangerous. The manufacturercannot be held responsible for damagecaused by improper use.

Do not allow small children or un-authorized personnel access to

the machine or its controls.

If thermal disinfection is required(93°C/200°F/10min.), the process

needs to be checked and documentedregularly. This can be done by check-ing the disinfection control diode on themachine. Alternatively, a chemical indi-cator may be used (e.g. the Disinfec-tion Control Tubes by A. Browne Ltd.,supplied by Miele). These disinfectioncontrol tubes should be placed in the filter combination. After the disinfectioncycle, they may be inspected by remov-ing the coarse filter.

The disinfection program shouldnot be interrupted, as this would

affect the disinfection result. If interrup-tion is necessary, the program shouldbe repeated.

Do not install the machine in areaswhere there is a risk of explosion.


1

The machine is built in accordancewith current safety requirements.

Any repair work should only be carriedout by a suitably qualified and compe-tent engineer. Repairs by unqualifiedpersons could be dangerous.

The electrical safety of this ma-chine can only be guaranteed if

connected to an electrical system thatcomplies with all local and nationalregulations. It should be checked by anexpert if necessary. The manufacturercannot be held responsible for damagecaused by incorrect wiring.

The machine should only be in-stalled by a suitably qualified and

competent contractor. Before connect-ing the machine, the installer shouldcheck that the voltage and frequencyof the electrical supply correspond withthe details on the data plate of the ma-chine.

Only genuine Miele parts or acces-sories should be used with the

G 7781 Dental Thermal Disinfector. Theperformance and safety of non-genuineparts or accessories cannot be guaran-teed, and use of such parts or itemsmay void the machine warranty. If youhave specific questions about machineoptions or accessories, please callMiele.

The use of Neodisher cleaning,neutralizing, and rinsing agents is

strongly recommended. The use of anyother products may invalidate the disin-fection resus and the manufacturer’swarranty.

The machine is completely isolatedfrom the electricity supply only

when it is unplugged or the circuitbreaker is turned off. This must bedone before any repair work is carriedout.

The water in this machine must notbe used as drinking water.

Only use detergents which havebeen approved of by Miele. Do not

use solvents in your machine as theremay be a danger of explosion.


2

Take care when handling liquidssuch as detergents, rinsing or neu-

tralizing agents. These may containacids or alkalis. Follow the instructionsand safety procedures on the packa-ging carefully and wear protectivegloves and goggles. Read the MaterialSafety Data Sheets.

Avoid inhalation of powdercleaners.

Empty any containers or glasswarebefore placing it in the machine.

Do not allow any acids or solvents, especially hydrochloric acid andchlorides, to get into the wash cabinet.

Be careful when sorting instru-ments with sharp pointed ends. If

possible, place the pointed end down-wards.

Install special inserts in accord-ance with the instructions provided.

When using the machine be care-ful not to scald or burn yourself.

Baskets and inserts must first beallowed to cool down. Any water whichmay have collected in incorrectlyloaded items will be very hot andshould be emptied into the washcabinet.

Do not touch the heating elementsafter the end of a program. You

could burn yourself.

Do not hose the machine down toclean it.

Do not sit or lean on the open door.This could cause the machine to

tip and be damaged.

When disposing of an old ma-chine, make sure the door catch is

removed. This will prevent children atplay from being accidentally locked in.


3

All relevant safety proceduresshould be obeyed. Relevant safety

procedures include, but are not limitedto, the Centers for Disease Control’sRecommended Infection Control Prac-tices for Dentistry and the OSHA Blood-borne Pathogens Standard.

The manufacturer cannot be held responsible for damage caused byfailure to heed the warning andsafety instructions.

SAVE THESEINSTRUCTIONS


4

Adding detergent Program selection

Powder detergent may be placed di-rectly on the door in the ”WASH 93°C”and ”DISINFECTION 93°C - 10’” pro-grams.

As an optional extra, this machine canbe equipped with a DOS module C 60,an automatic dosing pump for liquiddetergent. This is connected externallyby plugging into the rear of the ma-chine.

The DOS module is supplied with sep-arate instructions for installation anduse.

The different programs and their appli-cations are described in the followingprogram chart.

23

Program Chart G7781

Program When to useDetergent

(when not using liquid

detergent)

Please followmanufacturer’s

instructions.

RINSE(COLD)

To rinse heavily soiled instruments, e.g. aftersoaking them in a disinfecting agent. Thisavoids the build-up of foam in the machine.

DISINFECTIONVARIO93°C-10’

For protein soils (such as blood and secretions)– for cleaning and thermal disinfection with 90-93°C and 10 minutes holding time forinstuments which are susceptible to chemicalsand changes in temperature.

Preferably a neutral liquiddetergent should bedispensed

WASH93°C

Cleaning of instruments at 93°C with 3 minsholding time.

30 grammes on the right-hand side of the door interior

DISINFECTION93°C-10’

For thermal disinfection and cleaning ofinstruments at 93°C with 10 mins holding time.

30 grammes on the right-hand side of the door interior

Program Chart G7781

24

Program cycle Miscellaneous

1.Pre-wash

2.Cleaningand/orthermaldisin.

3.Interimrinse I

with neu-tralization

*)

4.Interimrinse

II

5.Finalrinse

and/ordisin.

6.Drying(extra

program)

*)see ”Programming special functions”

X

X X45°C**)

X X X93°C**)

(X) **)To change temperature,

see ”Programmingspecial functions”

X93°C

X X X80°C

(X)

X93°C

X X X80°C

(X)

Program Chart G7781

25

Turning the machine on and off

1. Turning onPress ”ON/OFF’ button.

2. Selecting a programAfter turning on the machine, the indica-tors next to the available selections willlight up.

Press the selector for the requiredprogram. The wash temperature ofthe selected program will show inthe display.

Select the option ”DRYING” ifdesired (see ”Selecting an additionalprogram”).

Press the ”START” touch pad. Thedisplay panel will now show the run-ning time in minutes for the selectedprogram.

During the heating stage in ”WASH”and ”FINAL RINSE” the end tempera-ture will be alternately displayed in thepanel. All other programs are blockedand only the lights for the selected pro-gram stay on.

Program change

Provided the ”START” touch pad hasnot yet been pushed, a mistakenly se-lected program may be changed as fol-lows:

Press the appropriate touch pad toselect the correct program.

Press the ”START” touch pad.

Otherwise, see ”Interrupting a pro-gram” on the next page.

3.Selecting an additional program

The following additional programs areavailable:

”DRYING”This may be selected immediatelyafter choosing a wash program (ex-ception: Rinse program). The heaterelements switches on intermittentlyduring the drying process for 10minutes. The total running time of theprogram will be lengthened accord-ingly.The instrument will not be absolutelydry. Please contact the sterilizermanufacturer regarding the dryingstage required for your sterilizationdevice. Instead of selecting thedrying cycle you can also performthe following steps:


26

Immediately after the program finishes, partially open the door(about 4 inches or 10 cm) for 10 to15 minutes. This allows the goods tocool down to avoid burning or scald-ing. Additionally, good drying resultsare achieved using the residual heat,which will help prevent the instru-ments from corroding. Aluminiumtrays are usually not suitable for ther-mal disinfection.

”REACTIVATION”(see ”Reactivating the water sof-tener”)

”DRAIN”– Press the ”ON/OFF” button.– Press the ”DRAIN” touch pad.– Press the ”START” touch pad.


27

Program sequence indicatorWhen a wash or disinfection programhas been selected, the indicator lightsin the display will show the program se-quence.

PRE-WASH

WASH

RINSE

FINAL RINSE

DRYING (optional)

DISINFECTED (only valid with the ”DIS-INFECTION 93°C - 10’” and the ”DISIN-FECTION VARIO 93°C-10’” programs)

When part of the program is com-pleted, the corresponding indicatorlight goes out. The wash cycle is com-pleted when the ”START” light goes out.The display panel will show the totalrunning time of the program.

Turning offPress the ”ON/OFF” switch and let itspring out. The machine can now beopened and unloaded.

Interrupting a programOnce a program is running, it shouldonly be interrupted in extreme cases,such as when articles in the machinerattle or bump against each other andhave to be rearranged.

The machine must be turned off, thewater drained and the program restart-ed:

Turn the machine off by pressing the”ON/OFF” switch and letting it springout.

Select the ”DRAIN” program.

On completion, open the door andrearrange the articles securely andcorrectly (wear protective wear ifnecessary).

Replenish the powder detergent dis-penser in the door if necessary.

Close the door. Reselect the pro-gram.

Important:Make sure that the ”DISINFECTED”light is lit at the end of a ”DISINFEC-TION” program, if the door was openedbefore its completion. If the light is out,the disinfection parameters were notmet and the entire program should berepeated.


28

Programming special functionsThe following special functions can beprogrammed where appropriate,

1. Extending the water inlet from 60’’to 120’’ with level control

If the inlet water pressure is lower than35 psi / 2.5 bar, too little water will flowinto the wash cabinet. By selecting theextended water inlet, more water willflow into the wash cabinet if there is lowwater pressure (between 15 and 35 psi /1.0 and 2.5 bar).

Turn off the machine.

Press ”DRAIN” and ”DRYING” at thesame time, while turning on the ma-chine. ”P3” appears in the display.

Press ”DISINFECTION 93°C-10’”. ”10” or ”11” will appear in the display.10 = 60’’ water intake11 = 120’’ water intake with level

control

Press ”DRYING” to change the dis-play to ”11”.

Press ”START”. ”SP” appears in thedisplay.

Press ”START” again. The changehas been stored and the displayfield clears.

2. Deactivating of neutralizer dis-pensing

The G 7781 is programmed from thefactory to dispense neutralizer duringthe first interim rinse. It is strongly recommended to use this option toavoid discoloration or corrosion. How-ever, dispensing of neutralizer mightnot be necessary if a pH neutral deter-gent is being used.

To deactivate the neutralizer setting per-form the following.



Press "WASH 93°C-3’": ”20” or ”21”will appear in the display.20 = without interim rinse I21 = with neutralizing agent

dispensed in interim rinse I

Press ”DRYING” to change from 21to 20 or vice versa.

Press ”START”. ”SP” appears in thedisplay.

Press ”START” again. The changehas been stored and the displayfield clears.

Programming special functions

29

3. Altering temperatures T1 (washtemperature) and T2 (rinse tempera-ture) in the ”DISINFECTION VARIO93°C-10’” program

The wash and final rinse temperaturesare set as standard at 45°C/113°F and93°C/200°F. If a wash temperature of60°C/140°F is required, this can be setin the following manner:



When DISINFECTION VARIO 93°C-10’ is pressed, ”30” appears inthe display. Press ”DRYING” tochange ”30” to ”31” or vice versa.

When ”RINSE” is pressed, ”40” ap-pears in the display. Do not changethis setting as it would be insufficientfor disinfection!

The following options are possible:

Main Wash

Rinse

30 – 40 45°C113°F

93°C200°F

30 – 41 45°C113°F

80°C176°F

31 – 40 60°C140°F

93°C200°C

31 – 41 60°C140°F

80°C176°F

To store the setting, press ”START”twice.

Programming special functions

30

Reactivating the water softenerWhen the ”REACTIVATION” indicatorlight on the left hand side of the controlpanel comes on during a program, thebuilt-in water softener is depleted andcannot supply any more soft water.

It should be reactivated with salt assoon as the wash program has fin-ished. If this cannot be done, and fur-ther loads have been washed, then thereactivation process should be carriedout twice in succession.

Each reactivation cycle requires:

2 kg / 4.4 lb. of water softener salt. A granule size of 1 to 4 mm is recom-mended by Miele. Do not use anyother type of salt, it may damage thewater softener.

The plastic salt container which issupplied with the machine.

Important

If the only reactivation salt available isfine grain, please consult Miele Cus-tomer Service.

Water softener salt with granules largerthan 4 mm cannot be used.

Filling the salt container

Unscrew the filter insert from the saltcontainer and remove.

WARNING: PERSONAL INJURY/EQUIPMENT DAMAGE HAZARD Do not fill container with cleaningdetergent! Fill with reactivation saltonly! Detergents can be corrosive,causing potential personal injuryand damage to the water softener.

Fill the salt container with approx. 4.4 lbs (2 kg) of granular salt andscrew the filter insert back in place.

Reactivating the water softener

31

Position the salt container as follows:

Remove the lower basket from themachine.

Unscrew the plastic cap in the baseof the wash cabinet.

Place the salt container on the reacti-vation socket and screw firmly intoplace.

Close the door.

Turn on the machine.

Press the ”REACTIVATION” touchpad.

Press the ”START” touch pad.

The reactivation program proceedsautomatically and finishes when the”Reactivation” light at the left hand sideof the control panel and the ”Start” indi-cator light have gone out.

Then:


Remove salt container slowly, allowing pressure to be released.Do not open by force, If you cannot unscrew it by hand, contact theMiele Service Department.

Screw the plastic lid back on thesocket.

Reposition the lower basket.

Rinse the salt container and filter in-sert thoroughly.

Important

If the water pressure is below 35 psi /2.5 bar of if it fluctuates, the water sof-tener cannot be reactivated in the nor-mal way. After reactivation, salt may stillbe found in the salt container.

To use up the salt and to wash out thewater softener, the ”Reactivation” pro-gram must be run again.

Reactivating the water softener

32

Cleaning an careCleaning the filters in thewash cabinetThe filter combination in the base of thecabinet should be inspected regularlyand cleaned if necessary.

Cleaning the coarse filter

Press the 2 tabs together, removeand clean the filter.

Put the clean filter back in positionand press until it clicks in place.

Cleaning the fine, flat and micro-finefilters

Remove the coarse filter.

Remove the fine filter from betweenthe flat and the micro-fine filters.

To unscrew the micro-fine filter, takehold of the two tabs and turn twice ina counter clockwise direction.

Pull up and remove the two filters.

Clean the filters.

The filter combination is then re-placed in the reverse order in whichit was removed.

The machine must not be used withoutall filters in place.

Cleaning an care

33

Cleaning the water inlet filters

Filters are incorporated into the stain-less steel housing located between thevalve and the hose.The filters must be cleaned when dirty,otherwise insufficient water will flow intothe wash cabinet,

Turn off the valves.

Unscrew the water inlet hoses.

Clean the large area filter (1) and thefine filter (2) or replace if necessary.

After reconnection, turn on thevalves and test for leaks.

1

2

Cleaning an care

34

Correcting minor problemsWith the aid of the following explana-tory notes, minor problems can be cor-rected without contacting the Miele Ser-vice Dept.

Any work on the electrical componentsof the machine should only be carriedout by a suitably qualified and trainedperson.

Warning lights

The ”DRAIN/FILL” warning lightflashes

Check that both water intake hosesare connected to the water supplyand that the faucets are turned on.

Check the drain hoses. They shouldnot be higher than 3 feet / 1 m fromthe base level of the machine. Theinner diameter of the hoses should inno point be less then 3/4’’ / 2 cm.

Check if any hoses are kinked. If so,please straighten them out.

The water in the machine must thenbe pumped out by choosing the”Drain” program. Then please restartthe program you would like to run.

The ”REACTIVATION” light is on

The water softener needs to be re-plenished. Please refer to ”Reactivat-ing the water softener”.

The ”DETERGENT” light is on

You are using the optional DOS mo-dule C 60. The liquid detergent con-tainer has to be refilled.

The ”NEUTRALIZER” light is on

The neutralizer container has to berefilled.

The display shows two dashes

Please call technical assistance. Themachine is stalled and cannot beoperated until it is reset by a trainedtechnician.

Correcting minor problems

35

Unsatisfactory cleaning results

Unsatisfactory cleaning results mayoccur as drying spots, or as spots thatlook like corrosion. Presumably corro-sive spots often are bio-debris. Theyhave the shape of drying spots, blurryedges, and the color of rust. Bio-debrismay also appear on surfaces that werenot contaminated before processing.Please observe:

Have the instruments been stored inthe machine for more than 6 hours?If so, please run the machine, evenpartially loaded, within 6 hours ofloading.

Was enough detergent used? Pleasecheck the dosage of the detergentand adjust, if necessary. Too little aswell as too much detergent maydeteriorate the cleaning results.

Can both spray arms rotate easily,even with the machine loaded? Ifnot, please rearrange the goods tobe cleaned in a way so that thespray arms can rotate freely.

Does the flap of the powder deter-gent dispenser open? If not, check ifanything obstructs the flap and pre-vents it from opening. Otherwise,please call technical assistance.

The water in the wash cabinet is notheated; the program sequence laststoo long

This machine has a resettable tempera-ture limiter which will shut off the heat-ing elements in the case of over-heat-ing. This could be caused if largearticles cover the heating elements or ifthe filters in the wash cabinet areblocked.

Remove the cause of overheating.

Take off the service panel (see nextpage).

Press in the blue reset button on thetemperature limiter.

If this switch trips repeatedly, the MieleService Dept. must be contacted.

In the event any problems cannot becorrected, please contact the MieleService Department.

Correcting minor problems

36

InstallationThe machine should only be in-stalled by a competent contractor.The contractor should be experi-enced in installing machines that require electrical hook-up as well asplumbing.

The machine must be installed andleveled correctly. Any unevenness inthe floor can be compensated for byscrewing the adjustable feet in or outas necessary.

The machine can be installed in the fol-lowing ways:

Free-standing

Under counter.The recess should be at least 233/4’’ / 60 cm wide, 23 3/4’’ / 60 cmdeep, and 33 1/4’’ / 85 cm high.

If necessary the machine top can beremoved as follows:

Open the door.

Remove the screws on the left andright, using a Philips screw driver.

Pull the top forward, lift and remove.

By removing the lid, the machine canbe built into a recess 32 1/4’’ / 83 cmhigh.

Installation

37

To remove the service panel andplinth

Remove the two 8 mm bolts ”a” fromthe service panel.

Take hold of the service panel atboth sides and pull forward.

Remove all four plinth screws ”b”.

Disconnect grounding lead if necess-ary.

Remove plastic protective cap.

To re-assemble:

Replace plastic protective cap,plinth facing and service panel in thereverse order in which they wereremoved.

Make sure the grounding lead is rec-onnected.

Do not us silicone sealant to seal thegaps between the machine and anyneighboring units as this will hinderventilation to the circulation pump.

Depending on the installation require-ments, the following kits are available:

34 1/4’’ / 87 cm high recess

This kit consists of longer machine feetand a base plate.(Part # 1107961)

Steam deflector

for use where the machine will be in-stalled under a wooden countertop.The underside of the work surface isprotected from steam damage by aplate of niro-steel.(Part # 1156150)

bb

bb

a a

Installation

38

Electrical connectionAll electrical work must be carriedout by a qualified electrician and incompliance with all local and na-tional electrical codes.

Before making any connections, checkthat the voltage shown on the dataplate corresponds to your power supply.

The machine is supplied as standardfor connection to a 208 V 60 Hz singlephase power supply and is fitted with apower supply cord 6 ft / 1.8 m long witha cross-section of AWG 10-4. It shouldbe connected to the main power sup-ply according to the opposite chart.

Voltage: 208 V, single phaseFrequency: 60 HzRated load: 6.0 kWCircuit breaker: 30 A per phase

The machine can be converted for con-nection to a 3 phase power supply.

WARNINGTHIS APPLIANCE MUST BE CORRECTLY GROUNDED! The manufacturer cannot be held responsible for damage or injurycaused by incorrect or missinggrounding.

The wiring diagram can be found be-hind the plinth on the left hand side, at-tached to the floor of the machine.

The data plate with serial and modelnumbers is on the rear of the machineand on the plinth behind the servicepanel.

Electrical connection

39

PlumbingConnection to the water inlet

The machine must be connected tothe water supply in accordance withall local and national plumbingcodes.

The machine is constructed with anair gap/anti-siphoning device onboth the intake and the drain sides.No such additional devices arenecessary or recommended, as theywill impede the water inflow into andout of the washer.

The water pressure must be be-tween 35 and 145 psi (2.5 - 10.0bar). If the water pressure is notwithin this range, the Miele ServiceDept. can advise you of themeasures to be taken (see also ”Pro-gramming special functions”).

This machine is designed for coldwater connection only, in view of itstechnical application.Both inlet hoses (water supply andsteam condenser) should be con-nected to the valves for cold water.

Valves with 3/4’’ male hose threadshould be provided on-site, andshould be easily accessible.

For additional protection of thevalves against impurities in the watersupply, large surface area filters areenclosed in the kit supplied with themachine (see diagram in ”Cleaningand care, water inlet”).

The water in the machine in not suit-able for drinking.

Drainage

The drain system is equipped with anon-return valve which prevents dirtywater from flowing back into the ma-chine.

The machine is supplied with two 5 ft. / 1.5 m long flexible drain hoseswith an inner diameter of 3/4’’ / 2 cm.They should not be shortened or at-tached to any fittings that wouldcause a reduction in water flow.

Longer drain hoses up to a length of13 ft / 3.3 m are available if required.

Both hoses can be attached to exist-ing drain lines through the use of a 11/2’’ / 3.5 cm or larger stand pipe / P-trap combination. Alternately, thehoses can be connected directly toexisting drain lines, provided any fit-tings or adapters used do not re-duce the water flow.

The drain hoses should not exceed13 ft / 3.3 m in length, or be attachedto the main drain at a point higherthan 3 ft. / 1m above the floor.

A floor drain is permissible.

Plumbing

40

Documents

Operating instructions for G 7781 DENTAL Thermal Disinfector · Dental Thermal Disinfector. Critical in-struments are used to penetrate soft tissue or bone, e.g. forceps, scalpels,