9 Practical Tips
42
9 P
R A C T I C A L
T
I P S
A) General operation of the furnace
After switching on the furnace, the lift moves down and performs automatic lift
calibration. The brief buzzing noise is due to technical reasons and is completely
normal. Please note that the furnace does not react to any key presses during this
calibration time.
The furnace heats up automatically to the temperature required to start the next firing
program (i.e. PREHEATING PROGRAM after switching on). In general, it occurs when
the firing chamber is open.
When the ceramic furnace heats up from a cold state, you will initially hear a rustling
noise of the heating element. This noise is due to technical reasons and is completely
normal.
Close the firing chamber in the event of prolonged breaks between firings. This will
save energy and avoid unnecessary wear on the heating element. This also prevents
unnecessary warming of the lid. The
AUSTROMAT D4
displays the message
"Saving energy" on the screen.
Close the firing chamber before switching off the furnace to avoid unnecessary
condensation in the ceramic furnace.
B) Heating
element
The heating element is a wear-sensitive part whose service life depends on how much
it is used. Running the check program regularly makes it easier to identify the correct
time to replace a heating element. Another way of identifying heating element wear is
visual inspection. Look into the open firing chamber from below while the furnace is
switched off and cold. The heating coil must be evenly inserted in the glass tube and
evenly distributed on the support tube at the core-guided heating element. If the heating
coil is deformed or if the glass is broken, the heating element should be replaced.
C) Thermoelement – temperature calibration
Visually inspect the thermoelement regularly - particularly before temperature
calibration - while the furnace is cold and switched off and the firing chamber is open.
A mirror held at an angle under the firing chamber can be very helpful. The
thermoelement is attached to the middle of the ceiling of the firing chamber and juts out
at a 90° angle into the firing chamber. Ensure that it is not bent since this influences
temperature measurement and hence the firing results.
D) Fast cooling
During fast cooling the vacuum pump draws outside air through the open firing
chamber. In this way, the temperature sensor is in a cool air current that simulates that
the chamber temperature is too low. When the pump is shut off, this cooling flow stops,
and the temperature starts to rise. In order to eliminate this deceptive effect, the pump
is operated at intervals. Please wait until the initial temperature is actually achieved and
fast cooling is automatically finished.
If you activate fast cooling with the pump, you should not place the firing object on the
firing table until cooling is completed, as otherwise the temperature may be too high for
drying.
DEKEMA Dental-Keramiköfen GmbH, AUSTROMAT
®
D4, Version 3, 2006
