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O
PERATION
Setting the Temperature
To change the set temperature, press and release the
Menu keypad once. The display will flash SP and the
Mode LED will be illuminated. The last set temperature
will then be shown in the display. To change the tempera-
ture, press the UP or DOWN arrow key. The adjustable
temperature range is 0 to -30°C (32 to -22°F). When the
desired set temperature is displayed, press the Menu key-
pad to enter the set temperature and activate the Units
Select menu.
Units Select
The second menu selects the units. The freezer control
displays temperature in °C or °F. The factory setting is
°C. Starting from the temperature display mode (Mode
LED off), press the Menu key twice. The current tempera-
ture units are displayed. To switch between units, press
the UP or DOWN arrow key to change to the desired
units, then press the Menu key to select. The desired unit
LED will be displayed on the right of the temperature dis-
play.
Calibration Offset
In the event the freezer needs calibrated, a simple routine
is available to adjust the display and control point to a ref-
erence standard. To set the temperature offset, press and
hold the Menu keypad for 5 seconds. The display will
flash oS (offset) followed by the last temperature offset
value. The factory setting is 0. To change the offset
value, press the UP or DOWN arrow key, then press the
Menu key. The value shown in the display will be added
to the previous temperature reading. The maximum offset
value is ±5°C (±9°F).
For Example:
The freezer has been operating at -15°C for 30 minutes.
The display indicates -15°C but a reference thermometer
in the chamber indicates -17°C. The operator presses
and holds the Menu keypad for 5 seconds and changes
the offset value from 0 to -2. The Menu key is pressed
until the Mode LED goes out. Now the display indicates a
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