Follett FZR5-PL Series Manuale di installazione, funzionamento e assistenza - Pagina 6
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Controller operation
In normal operation the controller displays cabinet temperatures in
degrees C (default) or user-selected degrees F.
Rocker buttons to the right of the temperature display control all
programming functions.
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) for nourishment applications where a lower temperature is
not desired (i.e. ice cream). 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 it 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
1
Press and release SET
To change temperature cut-out
STEP
INPUT
1
Press and hold SET for
3 seconds
2
Press UP or DOWN arrows to
desired cut-out temperature
3
Press and release SET
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. Remove key.
Note: An "Err" message displays for failed programming. Turn freezer OFF then ON to restart download, or
remove key to abort.
DISPLAY
Current cut-out temperature will display for approximately 5 seconds.
Display will return to current refrigerator temperature.
DISPLAY
Current cut-out temperature displayed, refrigeration system
energized LED fl ashes
New cut-out temperature displayed
New cut-out temperature blinks three times, then current refrigerator
temperature will display
6
Fig. 8
evaporator
fan
energized
defrost
- 35
not used
refrigeration
system
energized
prg
SET
°C