Controller operation
In normal operation the controller displays cabinet temperatures in
degrees C (default) or user-selected degrees F.
The controller is pre-programmed with a -35 C (-31 F) set point
which provides a compressor cut-in at -33 C (-27F) and cut-out at
-35 C (-31 F). The controller set point can be raised to -25 C
(-13 F) when a lower temperature is not desired. Follow instructions
for changing temperature cut-out below.
All set points have a 2 C differential. The 2 C differential means that
with a -35 C set point, for example, the compressor will turn off at -35
C (-31 F) and turn on when the cabinet reaches -33 C (-27 F).
This temperature may not refl ect the temperature of the blood products in the freezer. The temperature of the
blood products will be refl ected on the recorder chart and the recorder's digital temperature display. At times there
may be a difference between the two displayed temperatures. Adjust the controller SET value to achieve your
desired blood product temperature as displayed on your chart recorder.
To display temperature cut-out
STEP INPUT
DISPLAY
1
Press and release SET
Current cut-out temperature will display for approximately 5 seconds.
Display will return to current refrigerator temperature.
To change temperature cut-out
STEP INPUT
DISPLAY
1
Press and hold SET for
Current cut-out temperature displayed and °C will fl ash
3
seconds
2
Press UP or DOWN arrows to
New cut-out temperature displayed
desired cut-out temperature
3
Press and release SET
New cut-out temperature blinks three times, then current refrigerator
temperature will display
Programming freezer from a key (download)
1. TURN OFF freezer.
2. Remove 6 screws from panel holding controller to access back of controller.
3. Insert degree F programmed key into 5 PIN receptacle on controller back.
4. TURN ON freezer.
5. Values from key automatically download to freezer (“dol” message blinks followed by “end”).
6. After 10 seconds display returns to current freezer temperature and controller will restart with new values.
7. TURN OFF.
8. Remove key.
9. Reinstall panel.
Note:
An “Err” message displays for failed programming. Turn freezer OFF then ON to restart download, or
remove key to abort.
6
°C
- 35
evaporator
fan
energized
defrost
refrigeration
system
energized
Fig. 5
Summary of Contents for C45184
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