Miele professional G 7881 User manual

G 7881 DENTAL THERMAL DISINFECTOR
Installation and In-service Manual

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1. Examine exterior packaging for damage
●If damaged, notify carrier and then please call 800-666-0486 for Miele's Returns department.
2. Uncrating instructions
●Carefully cut the two packing straps.
●Lift cardboard box off of machine.
●Properly dispose of all packaging materials. All of the protective packaging material is environmentally
safe and can be recycled.
●Carefully lift machine from pallet. Do not lift machine by its lid!
3. Remove Operating Instructions manual from the rear of the machine and save for future
reference
Note: You will need the manual and installation diagram for the remaining steps.
4. Open machine door via the emergency release and remove accessory items
(i.e. water inlet filter, drain hose, warranty card, water softener funnel, red empty 5L neutralizer container, steam deflector, etc.)
Slowly pull the emergency release cable located at the bottom
of the machine (see illustration).
5. Remove Styrofoam blocks from upper basket support and discard
6. Connect drain hose to the rear of the machine using enclosed hose clamp
All plumbing work must be performed by licensed professionals and adhere to all applicable Local, State, and Federal Codes. Note:
plumbing code in certain areas may require the use of the optional Cool Down Kit (Item # Cool Down Kit) to reduce the temperature
of the effluent. Contact Miele Technical Service for ordering and installation information.
●The drainage system is fitted with a non-return valve which prevents dirty water from flowing back into
the machine via the drain hose.
The drainage system must be able to take a minimum drainage flow of 4 gal/min.
The onsite drain connection point should be located between 1 ft. (0.3 m) and 3 ft. (1 m) above
the lower edge of the machine.
If it is lower that 1 ft. (0.3 m), lay the hose in a curve at a height of at least 1 ft. (0.3 m).
●The drain hose is approx. 5 ft. (1.4 m) long, is flexible and has an internal diameter of 7/8 in. (22 mm). It
must not be shortened. Hose clamps are supplied for securing it in position.
●The drainage system must not exceed 12 ft. (4 meters).

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6. Connect drain hose to the rear of the machine using enclosed hose clamp (continued)
The machine should preferably be connected to a separate drainage system such as a standpipe or floor drain.
Such a connection is mandatory when utilizing the optional Cool Down Kit. If the Cool Down Kit is not required,
the drain hose can be connected to an under-sink ¾" tailpiece.
7. Either attach proper plug to power cord or hardwire to electrical supply
All electrical work must be performed by licensed professionals and adhere to all applicable Local, State, and Federal Codes.
The machine comes equipped for a connection to 208 V, 60 Hz, 1 phase power supply. It is equipped with a 6ft.
long, 10/3 AWG power cord, without a plug. The installer may either install an electrical plug or hardwire the
machine into an electrical junction box that has been installed on the wall or in a cabinet adjacent to the
machine. It should be connected to the main power supply.
Voltage: 208 V, 1 phase
Possible conversion to three-phase - Contact Miele Technical Support for
additional information.The conversion diagram and the wiring diagram is
secured to the inner side of the service panel.
Frequency: 60 Hz
Rated Load: 60kW
Circuit Breaker:2x30A
Black: Connect to L1 (hot)
White: Connect to L2 (hot)
Green: Connect to GND (ground)
WARNING – THIS APPLIANCE MUST BE GROUNDED
8. Connect the water inlet hose to the water supply
All plumbing work must be performed by licensed professionals and adhere to all applicable Local, State, and Federal Codes.
●Hose connection is a ¾" GHT.
●Use the proper inline cartridge filter, identifiable by its shiny chrome finish.
The machine must only be operated with the voltage, frequency, and fusing shown on the
data plate located on the rear of the machine and on the plinth (behind the service panel).
The inlet hose must not be shortened or damaged in any way (see illustration).

9. If applicable, connect the optional DOS G 60/1 power supply and feed hose
(Please refer to DOS G 60/1 Installation Instructions that are shipped with the unit)
10. If applicable, connect and activate the DI water intake connection
All plumbing work must be performed by licensed professionals and adhere to all applicable Local, State, and Federal Codes.
Leading instrument manufacturers recommend a DI water rinse as the final processing step prior to
sterilization. Rinsing with DI water ensures the elimination of detergent residues and naturally occurring
minerals which could lead to instrument stains and corrosion.
As a standard feature, the machine can be supplied with both cold tap water and a DI water connection of:
Acceptable water pressure (flow rate): 10-147 psi
Recommended water pressure (flow rate): 25-60 psi
●The DI pressure-tested hose (marked "H2O pure") with a ¾"(19 mm) GHT female hose thread must be
connected onsite to the DI inlet for purified water.
●Use the proper inline cartridge filter, identifiable by its matte finish.
●Activate the DI water intake valve. The machine must have the DI water connection activated within the
programming priot to use.
11. Adjust the feet to the proper height
●Adjust feet to proper height.
●Slide machine into place, making sure machine is level.
●Open the door.
●Secure the machine in place
Undercounter
Note: If necessary, remove the lid from the machine.
Make certain to not pinch hoses.
Secure machine to the front edge of the worktop using screws to the left and right of
the front trim.
Secure machine to countertop.
Freestanding
Open the door.
Remove the fixing screws on the left and right sides using a Phillips head screwdriver.
Pull the machine lid approx. 5mm forwards, lift it upwards, and remove.
Use Mounting Kit (Item #00253531)
12. Install the Steam Deflector if applicable
Note: A Steam Deflector protects the countertop and comes packaged with the unit.
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Do not use silicone sealant to seal the gaps between the machine and any neighboring units.
Activating the DI Water Intake Valve:
1. Turn off the machine with the "On/Off" button.
2. Turn the program selector to the "Stop" position.
3. Press and hold the "Display" and "Start" buttons at the same time.
4. Simultaneously turn the machine on with the "On/Off" button.
The current program status "P…" will appear in the display and the "Fill/Drain” indicator will illuminate.
5. Press the "Drying" button once. "E01" (programming level 1) will appear in the display.
6. Turn the program selector one switch position counter-clockwise (11 o'clock position).
The number "111" will appear in the display
This indicates the G 7881 is set to accept water only through the Cold Water Intake
7. Press the "Display" button as many times as necessary until the display shows the number “110.”
Once the number "110" has been reached the G 7881 will activate the DI Intake Valve for the final rinse.
8. Press the "Start" button. "SP" will appear in the display.
9. Press the "Start" button again.

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Inadvertently filling the sale reservoir with cleaning agent will damage the water softener.
Before filling, make sure that you are using reactivation salt.
13. Test the water hardness and activate softener if necessary
Note: If not using water softener, please set and save the water softener setting at 0.
Before using the machine for the first time the water softener should be programmed according to the hardness
of the incoming water. You can determine water hardness with a simple test kit or by contacting your local
water authority.
Note: the G 7881 is set at the factory for a water hardness level of 19 gr/gal (340 ppm.). If your hardness level is
other than the factory default then the G 7881 must be reprogrammed to the proper setting. Reference the
Hardness Table below for the correct value.
Water Hardness Table
A. Filling the salt reservoir:
Only Miele approved reactivation salt should be used in the G 7881.
Do not use other types of salt, e.g. table salt, agricultural, or gritting salt. These could contain
components which are insoluble in water and could damage the water softener. If in doubt,
consult Miele's Professional Department.
The Salt reservoir holds approx. 2.5 kg of salt.
Settings
0-20
gr/gal
1-20
ppm
CaCo3
0120
0240
0350
4470
5590
66110
77130
88140
99160
10 10 180
11 11 200
12 12 220
13 13 230
14 14 250
15 15 270
16 16 290
17 17 310
18 18 320
19 19 340
20 20 360
Settings
21-40
gr/gal
21-40
ppm
CaCo3
21 21 380
22 22 400
23 23 410
24 24 430
25 25 450
26 26 470
27 27 490
28 28 500
29 29 520
30 30 540
31 31 560
32 32 580
33 33 590
34 34 610
35 35 630
36 36 650
37 37 670
38 38 680
39 39 700
40 40 720
ne
neodishe
gr/gal
41-60
ppm
CaCo3
41 41 740
42 42 760
43 43 770
44 44 790
45 45 810
46 46 830
47 47 850
48 48 860
49 49 880
50 50 900
51 51 920
52 52 940
53 53 950
54 54 970
55 55 990
56 56 1010
57 57 1030
58 58 1040
59 59 1060
60 60 1080

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13. Test the water hardness and activate softener if
necessary (continued)
A. Filling the salt reservoir
●Remove the bottom basket from the machine.
●Unscrew the salt reservoir cap.
Before filling the salt reservoir with reactivation salt for
the first time, fill it with approx. ¾ gallon of water.
●Place the funnel provided in place
(see illustration).
●Carefully fill the reservoir with salt. Displaced
water will run out as it is being filled.
●Wipe any residual salt off the screw threads
on the socket.
●Screw the cap on firmly.
●Immediately after this step: Run the "Rinse" program
●to remove any traces of salt from the cabinet.
Note: There may be a delay before the "Rinse" program
starts due to the reactivation of the water softener.
B. Setting the water softener
●Turn off the machine with the "On/Off" button.
●Turn the program selector to the "Stop" fposition.
●Press and hold the "Display" and "Start" 6buttons at the same time.
Simultaneously turn the machine on with the "On/Off" button.
The current program status "P…" will appear in the display and the "Fill/Drain: indicator will illuminate.
●Press the "Drying" button once. "E01" (programming level 1) will appear in the
display.
●Turn the program selector one switch position clockwise (1 o'clock position).
The number "19" will appear in the display (this indicates the factory water hardness
setting in gr/gal, equivalent to 340 ppm).
●Press the "Display" button as many times as necessary or hold it in until the
` required value (hardness level in gr/gal) appears in the display. Once the number "60"
has been reached the counter will begin again at "0."
●Press the "Start", 6button. "SP" will appear in the display.
●Press the "Start" 6button again.
The setting will now be stored in memory. The display will go out.
For future serving, it is useful to make a note of your water hardness level.
●Enter your water hardness level here:
__________ gr/gal or __________ ppm
C. Salt Indicator (see illustration)
Reactivation takes place automatically during a program.
The "Recharging" indicator (#1 in illustration) illuminates.
When the salt reservoir is empty, the "Recharge"
indicator (#2 in illustration) illuminates to remind you
to fill the reservoir.

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14. Prime the pumps
Only use detergent and neutralizer recommended by Miele.
Take care when handling liquid agents and additives as they may contain irritant or corrosive ingredients. Follow the manufacturer's
safety instructions and relevant Health and Safety procedures carefully. Wear protective gloves and goggles.
A. Priming the neutralizer dispensing system
●Turn the program selector to the "STOP" fposition.
●Turn off the machine.
●Press and hold the "Display" and "Start" 6buttons at the same time.
Simultaneously turn the machine on with the "On/Off" button.
The current program status "P…" will appear in the display and the "Fill/Drain" indicator will
illuminate.
●Press the "Drying" button twice, "E02" (programming level) will appear in the
display.
●Turn the program selector to the 5 o'clock position. "do3" appears in the display.
●Press "Display" The dispensing system will be primed automatically. "do3" will
appear in the display when priming is finished.
Note: Run the "Rinse" program to dilute and drain away any agents that may remain in the wash cabinet, every time the dispensing
system has been primed.
B. Refilling the neutralizing agent
When the "Neutralizer" indicator illuminates
●Replace the current neutralizer container with
a full one.
●The indicator light should go out.
●If the container has been allowed to run dry,
the light will not go out until the priming
process is performed.
C. Setting & Priming the optional DOS G60/1 detergent dispensing system
As a separate option, the G 7881 can be fitted with the DOS G60/1 liquid detergent dispenser.
The DOS unit is supplied with its own installation instruction manual. Follow the instructions for
connecting the dispensing option. Once connected to the G 7881 secure the detergent supply
tube in the detergent bottle.
Setting the detergent dosage
●Turn the program selector to the "Stop" fposition.
●Turn off the machine with the "On/Off" button.
●Press and hold the "Display" and "Start" 6buttons at the same time.
Simultaneously turn the machine on with the "On/Off" button.
●The current program status "P…" will appear in the display and the "Fill/Drain: indicator
will illuminate.
●Press the "Drying" button twice. "E02" (programming level 2) will appear in the
display.
●Turn the program selector to "Wash" (2 o'clock position).
●Press "Display" as many times as necessary to set the dosage amount .40 (50 ml).

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14. Prime the pumps (continued)
C. Setting & Priming the optional DOS G60/1 detergent dispensing system
●Turn the program selector to the 1 o'clock position. "do1" appears in the display.
●The dispensing system will be primed automatically. "do1" will appear in the display
when priming is finished.
●Press "Display" . The dispensing system will be primed automatically. "do1" will
appear in the display when the priming is finished.
●Press the "Start" 6button. "SP" will appear in the display.
●Press the "Start" 6button again. The setting will now be stored in memory. The dis
play will go out.
●After priming, run the "Rinse" program to remove detergent residues from the wash
chamber.
Note: If detergent is allowed to become empty, reference G 7881 Operating Instructions for priming the
system.
15. Add the rinse aid
Rinse aid is necessary to ensure water does not cling to and leave marks on items during the drying phase. It
also enables items to dry faster after they have been washed. Rinse aid is poured into the storage reservoir and
a pre-set amount is dispensed automatically. The rinse aid reservoir holds approximately 180 ml.
A. Adding rinse aid
●The reservoir must be filled with rinse aid
when the"Rinse aid" indicator illuminates
(as seen in illustration).
There is also a level indicator for the rinse aid
reservoir on the inside of the door.
●Open the door fully.
●Unscrew the cap (see illustration).
Inadvertently filling the rinse aid reservoir with detergent (including liquid detergent) will
damage the reservoir. To avoid damage and ensure proper results only use Miele
approved rinse aid.

15. Add the rinse aid (continued)
A. Adding rinse aid
Pour rinse aid into the storage container until the level
indicator is dark (see arrow in the illustration). Use a
funnel if necessary.
●Screw the cap back on and wipe up any spilled
rinse aid.
This prevents over-foaming from occurring during the
next program.
●Wait until the "Rinse aid" indicator on the control panel
illuminates before adding more rinse agent.
B. Setting the dosage
●The dosage adjuster in the opening as settings
from 1 to 6 (1-6ml) It is factory-set to 3 (3ml).
●Use a higher setting if spots are left after drying.
●If surfaces become cloudy and/or streaky,
use a lower setting.
16. Load baskets & inserts into the machine
The G 7881 normally requires a top and bottom basket. Various inserts and special baskets are also available
for a wide variety of instruments.
A. Preparation
●Ensure that no acid or solvent residue, especially hydrochloric acid or chlorides, gets
into the wash cabinet.
B. Load the bottom basket
●Insert lower basket with handle, circled in photo,
facing out of the machine.
●Add all applicable inserts.
C. Load the top basket into the wash chamber
●Add all applicable inserts.
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16. Load baskets & inserts into the machine (continued)
D. Adjust the top basket coupling
●Make sure that the water connection spring
adapter unit is inserted in the machine.
It must be 4-5 mm higher than the water
connection inlet. If it is not, loosen the plastic
nut, push the adapter (4-5 mm higher than
the water connection inlet) and tighten the
plastic nut.
E. Run the program cycle
17. Décor Panel Mounting Instructions (optional)
1. Remove the Lower Panel from the G 7881 via the
2 mounting screws (A).
2. Remove the Lower Panel Décor Frame mounting piece via the
6 phillips head screws (B).
3. Slide out the Lower White Décor Panel and replace it
with the laminate sheet.
4. Replace the Lower Panel Décor Frame mounting piece via the
6 phillips head screws (B). Set Lower Panel aside.
5. Remove the bottom piece of the Upper Panel Décor Frame
via the 3 phillips head screws (C).
6. Open the machine door so side screws are accessible (D).
7. Remove both sides of the Upper Panel Décor Frame via the
3 phillips head screws on each side (D).
8. Slide out the Upper White Décor Panel and replace it with the
laminate sheet.
9. Replace the sides of the Upper Panel Décor Frame via the
3 phillips head screws on each side (D).
10. Close the machine door so bottom screw holes are
accessible (C).
11. Replace the bottom piece of the Upper Panel Décor Frame
via the 3 phillips head screws (C).
12. Replace the Lower Panel on the G 7881 via the two
mounting screws (A).
18. The G 7881 is now ready to operate
D
C
A
A
B
B
D