17
TEMPERATURE SETTING
Table 1 shows the basic procedure for setting the chamber temperature. Perform key operations in the
sequence indicated in the table. The example in the table is based on the assumption that the desired
temperature is -25
o
C.
Note:
The chamber temperature is set to -30
o
C at the factory.
Table 1. Basic operation sequence (Example: Chamber temperature -25
o
C)
Description of operation
Key operated
Indication after operation
1 Connect the power supply plug.
―
The current chamber temperature is
displayed.
2 Press set key.
SET
The second digit is flashed.
3
Set to -25 with the numerical value
shift key and digit shift key.
When pressed, the settable digit is
shifted.
When pressed, the figure of
settable digit changes.
4 Press set key.
SET
Set temperature is memorized and the
current chamber temperature is
displayed.
•
The chamber temperature can be set within the range of -35 °C to -18 °C. For MDF-MU339, the ambient
temperature is 35 °C and the guaranteed temperature is -30 °C at no load. In the case of MDF-MU539, the
ambient temperature is 30 °C and the guaranteed temperature is -30 °C at no load.
• The setting mode returns to the temperature display mode automatically when 90 seconds has passed
without any key operation. In this case, any setting before pressing set key (SET) is not memorized.
KEY LOCK FUNCTION
This unit is provided with the key lock function. When the key lock is ON, change of temperature setting
through the key pad is not possible. The key lock is set to OFF at the factory.
Display
Mode
Function
L 0
Key lock is OFF
Enable to change temperature setting
L 1
Key lock is ON
Disable to change temperature setting
Table 2. Procedure for key lock setting (change from key lock OFF to key lock ON)
Description of operation
Key operated
Indication after operation
1
―
―
The current chamber temperature is
displayed.
2 Press digit shift key for 5 seconds.
The display changes to L 0 and the
first digit blinks.
3
Press numerical value shift key
and scroll the figure to 1.
When pressed, the figure of
settable digit changes.
4 Press set key.
SET
The key lock is set to ON.
The current chamber temperature is
displayed.
• The setting mode returns to the temperature display mode automatically when 90 seconds has passed
without any key operation. In this case, any setting before pressing set key (SET) is not memorized.
