Mestra 080142 Mode D'emploi page 12

English
Lamp (3) also remains on whenever the resistor is
working.
• In the normal course of the program the furnace
can be stopped at any time by holding down
Stop/Start (5) for approximately 5 seconds. You
can also enter programming mode and modify the
parameters of the program which is running if you
wish.
• If there is a power cut the furnace retains in its
memory the parameters of the step in progress,
and when power is restored the program will
continue from the point at which it stopped. If the
switch (13) is turned off before the program is
completed, the furnace takes this as a power cut,
and will therefore use maximum power when it is
re-connected to
temperature level before disconnection.
• Once program step A4 is completed the furnace
emits a warning buzz. A further buzz is emitted at
the end of A6. This buzzer can be disconnected by
pressing any key on the control panel.
• At the end of the process, remove the cylinders
and crucibles carefully. While the unit is running
the outer housing may heat up. The cylinders and
crucibles also heat up considerably, and so
gauntlets and tongs should be used when handling
them.
• To run another program, first stop the furnace by
holding down Stop/Start (5) for 5 seconds, then
selecting another program via the programming
key (14) and the Up/Down keys (8 & 9). Finally, re-
start the furnace by pressing Stop/Start (5) for one
second.
• Use the On/Off switch to disconnect the furnace
from the mains (13).
MAINTENANCE AND CLEANING
To ensure long, reliable operation of the unit, proceed
as follows:
• Clean the outside of the furnace regularly with a
cloth moistened in soapy water.
• Take care not to damage the muffle lining the
inside walls of the furnace hearth when you put in
or take out cylinders and crucibles.
• Always use the SiO
filtration, which may damage the muffle.
• Prevent liquids or solids from contaminating or
dirtying the muffle of the furnace.
• To make best use of the unit, TALLERES
MESTRAITUA, S.L. recommends the use of
MESTRA cylinders and crucibles.
• If the machine detects that the temperature is
higher than 1150 ºC, a special display will appear,
and also a characteristic acoustic signal indicating
a dangerous situation (Fig. 1).
These characteristic
alternatively in the two displays, and disappear
12
attempt to retrieve
hearth plate to prevent
2
symbols will
after 3 seconds. The display will then show the
usual signal. This situation will repeat every 5
seconds.
This alarm appears also when the triac breaks.
• When this happens and the alarm signal
appears, disconnect the main switch and call for
technical assistance.
• The furnace has two circuit breakers located
near the cable (J and K) to protect the furnace
against electric overloads. To get the furnace
working again, reset the circuit breaker.
If the temperature indicator display (1) flashes
during normal furnace operation and reads 1200
the
ºC, disconnect the unit from the mains and
consult your authorised MESTRA dealer: the
thermocouple is damaged. The thermocouple is
subject to wear, and its durability depends on
working temperature. This element is not covered
by guarantee.
PRECAUTIONS
♦ Before connecting the unit ensure that the power
outlet is for 230 V, 50/60 Hz, and that it is
earthed. It must also be properly protected by a
thermal magnetic cut-out (consult your installer).
♦ Do not allow children or unskilled personnel to
handle the unit.
♦ Always keep the door closed while the furnace is
operating.
♦ Take care when opening the door: the hot fumes
pouring out can cause burns.
♦ Do not overfill the furnace or place objects in it
which might fall when the door is opened.
♦ Do not put inflammable materials or liquids in the
furnace, or substances which may give off toxic
fumes.
♦ Place the furnace on a flat, firm, vibration-free
surface close to an extractor hood. Ensure that
the furnace is well away from any flammable
materials.
♦ Place the unit so that its sides are at least 15 cm
from any wall or other object. Take particular care
to place the ventilation tube in a free area at least
20 cm from the closest object.
♦ Always use gloves and tongs to remove and put
in cylinders and crucibles. Do not touch the metal
housing of the furnace when it may be hot.
♦ Handle heated materials removed from the
furnace with great care: their temperature may be
as high as 1100 ºC and may therefore cause
accidents.
♦ Before using the furnace for the first time, hold it
at 300 ºC for 1 hour to eliminate any moisture in
the muffle.
appear
♦ Always use the furnace under an extractor hood.
IMPORTANT