14
PRIOR TO OPERATION
Plug-in the instrument to correctly grounded sockets.
Insert the key to the power switch lock at the back.
Power the freezer on by rotating the key clockwise.
Observe that the microprocessor control system is activated.
Learn the function of the control panel (See Section 5.7.).
The ultra-low freezer starts automatically according to the last set temperature. You should
set the temperature value according to your need (See Section 6.1.6).
When ultra-low freezer starts to operate, the temperature of the chamber will appear on
the control panel and audible and visual alarm will be activated. Push alarm mute key (F2) to
mute the audible alarm. Temperature of chamber appears on the control panel during
cooling process.
DF deep freezer will reach -80°C
approximately in
6 hours if the chamber is not
loaded. (This period depends on the ambient temperature.)
Suitable room conditions should be considered for best performance. Efficient
performance at -86°C requires ambient temperature of 16°C.
OPERATING PRINCIPLES
PROGRAMMING
At most 70% of the surface area of the shelves should be loaded in order to obtain a
uniform temperature distribution.
The temperature alarm range can be adjusted between 5
C and 25
C. Red colored
screen meaning warning will be displayed when ultra-low freezer is operated for the
first time and audible alarm will be activated. Push the alarm mute key (F2) to mute
the audible alarm. The red screen turns into the blue when temperature in the
chamber is in the temperature alarm range.
6.1.1.
OPERATING MODE
When the ultra-low freezer is powered on, it
starts to operate automatically according to the
last set values. The screen on the left is operating
mode screen on which set temperature and
chamber temperature values appear. Current
date and time are shown at the top of the screen.
“
” icon flashes on this screen while the freezer
cooling.
