14
OPERATING INSTRUCTIONS
Basic method of Operating the Control Panel (Model MDF-U2086S)
Table 1 shows the basic operation method. Perform key operations in the sequence indicated in the table.
The example in the table is based on the assumption that the temperature is –80
o
C .
*The unit is set at the factory that the temperature inside the unit is -86
o
C.
Table 1. Basic operation sequence. (Ambient temperature : 20
o
C )
Description
of
operation
Key
operated
Indication after operation
Mode
1
Turn the power switch “on”
----
Present temperature will be
displayed.
Present temp-
erature display
mode
2
Press SET key
SET
The second digit of the temperature
indicator is flashed.
The settable digit will move.
Temperature
setting mode
(SV mode)
3
Set the temperature to -80
with the digit shift key and
numerical value shift key.
The figure of settable digit will
increase.
4 Press SET key
SET
Setting temperature will be
memorized and present
temperature will be displayed.
Present temp-
erature display
mode
*Although the value of the internal temperature setting can range from –20
o
C to –95
o
C, the guaranteed
temperature when there is no load is -86
o
C when the ambient temperature is +30
o
C .
Key lock function
This unit has the key lock function of control panel shown in Table 2 below.
Table 2. Operation sequence of key lock
Description
of
operation
Key
operated
Indication after operation
Mode
1
----
Present temperature will be
displayed.
Present temp-
erature display
mode
By pressing for 5 seconds, L O
will be displayed.
Key lock mode
2
Set the key lock with the
digit shift key and numerical
value shift key.
By pressing key, L 1 will be
displayed and the key lock will
be active.
3 Press SET key
SET
Key lock is completed and
present temperature will be
displayed.
Present temp-
erature display
mode
*The key lock only works with the internal temperature setting and the Record key.
*To release the lock, select when performing the key lock mode operation described above.
