Memmert BE 600 - Page 6

Malfunction
Units with
adjustable
overheat
cut-out but
manual
reset TWB
class 2
3. Set the adjustable overheat controller TWW with knob 9 above the
selected working temperature by an appropriate amount (e.g. 5°C).
This scale can also be locked by turning screw 9a. The selected
setpoint of the overheat controller TWW can always be read on the
temperature display 12.
Steady conditions have been reached when the desired tempera-
. ture can be read on the built-in digital temperature display 7 for
several times.
od. in order to provide optimum protection of thermal-sensitive İoads
better against overtemperatures in case of failure of the thermostat
it is advisable to reset the adjustable overheat controller TWW
(rotary button No. 9) - after building-up and steady temperature
conditions have been reached - so far that it is just not operating.
This setpoint-reduction should be effected very slowly step by step
. for one digit (resp. one rest) slightly above the actual steady
temperature (approx. 3°C resp. at incubators approx. 0.5°C).
If the selected operating temperature is exceeded due to a fault in the
temperature control circuit, the temperature control is taken over by the
overtemperature controller as soon as the temperature set with knob 9
and displayed on display 12 has been reached. This is indicated by
flashing of the red signal lamp 5. The unit must be checked
immediately by a qualified electrician.
Putting the oven into operation as well as setting temperatures have to
be done as described under "adjustable overheat controller TWW -
item 1 - 3" |
Malfunction:
lf the adjustable temperature limiter TWB is activated due to a fault, the
TWB switches off the heating on all poles when the temperature set
with knob 9 and indicated on display 12 has been reached. The
adjustable temperature limiter can be reset by switching the knob 2
briefly off and then on again after the temperature has dropped below
the temperature reading of display 12. The unit must be checked
immediately by a qualified electrician.
Temperature This Memmert oven is equipped with an electronic adjustable
limiting
device
mechanical
overheat controller (Class 3.1 in compliance with DIN 12 880). An
adjustable temperature limiter (Class 2 in compliance with DIN
12880) can be specified in place of the electronic adjustable
overheat controller. In addition, either variant is equipped with a
temperature limiting device (Class 1 in compliance with DIN 12880)
which automatically shuts of the oven if it exceeds the maximum
termperature by more than 10°C.
UE/BE 200-800/ULE 400-800
8
Malfunction:
In case the adjustable overheat controller or the adjustable temperature
limiter malfunction, and the oven exceeds its maximum temperature
rating by 10°C, the temperature limiting device will automatically shut off
the heater. In this case the temperature dispiay of the working controller
and the yellow control lights will turn off. The green and red control light,
as well as the display of the overheat controller, will remain on. In ovens
with forced convection, the air turbine will continue to run.
in case of a malfunction - overheat condition- the unit has to be
checked by a qualified service engineer!
If the oven is exposed to freezing temperatures for an extended period,
the temperatur limiting device turns on. In this case, reset the device by
following the procedure for resetting the temperature limiting device,
steps 2-5.
WARNING! =
Before removing top cover -
Procedure
for resetting
the
temperature
limiting
device
Function
control for
the adjustable
overheat
controller
(class 3.1)
and the ad-
justable tem-
perature limi-
ting device
(class 2)
pull out plug
1. Let the oven cool down before attempting to service it.
2. Remove screws along the top edge of the backside of the cover.
3. Slightly raise the top cover of the oven and siowly slide the cover
backwards.
4. Press the red reset button on the temperature limiting device. The
oven will emit an audible click when the temperature limiting device is
reset.
5. Reassemble the oven. Make sure to use washers when fastening the
Screws.
The safety devices (Class 3.1 and Class 2) should be checked on a
daily basis once the oven has stabilized at the desired temperature.
To perform this safety check, begin by loosening screw 9a. Reduce
the setting of the protection device until red control light 5 turns on.
At this point temperature display 12 and temperature display 7
should show the same temperature (+0,5°C for incubators, +1°C for
other ovens).
Now set the protection device as described in the paragraph
“Adjustable overheat controller" - point 3. The red control light
will turn off.
UE/BE 200 - 800/ULE 400-800