Follett REF Series Manuale di installazione e assistenza - Pagina 6
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Controller operation
In normal operation the controller displays cabinet temperatures
in °F (default) or user-selected °C. °C temperatures are displayed
to 1 decimal point.
A snowfl ake LED displays when the compressor is running.
The controller is pre-programmed with a 34 F set point which
provides a compressor cut-in at 38 F and cut-out at 34 F. This
may not meet your specifi c application needs. For example, many
pharmaceutical manufacturers recommend that their refrigerated
medications be stored between 36 F and 46 F. Instructions for
changing the set point are found below.
Refer to the chart below for the set point for your application's required temperature range:
Set point
Cut-in/
°F/°C
Cut- out °F
34° / 1.1°
38° / 34°
35° / 1.7°
39°/ 35°
36° / 2.2°
40° / 36°
37° / 2.8°
41° / 37°
38° / 3.3°
42° / 38°
39° / 3.9°
43° / 39°
40° / 4.4°
44° / 40°
41°/ 5°
45° / 41°
All set points have a 4 F differential (HY setting on the controller). The 4 F differential means that with a 34 F set
point, for example, the compressor will turn off at 34 F and turn on when it reaches 38 F.
Because there is still refrigerant in the evaporator, there can be an additional 1 F - 1.5 F of downward "drift" in
To display temperature cut-out
temperature after the compressor turns off. The temperature may momentarily display as low as 32 F (32.9 F and
STEP
INPUT
below rounds down to 32 F) before beginning to rise again.
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 per
above table
3
Press and release SET
Cut-in/
Normal display
Cut-out °C
range temperature °F/°C
3.3° / 1.1°
32° - 38° / 0° - 3.3°
3.9° / 1.7°
33° - 39° / .6° - 3.9°
4.4° / 2.2°
34° - 40° / 1.1° - 4.4°
5° / 2.8°
35° - 41° / 1.7° - 5°
5.6° / 3.3°
36° - 42° / 2.2° - 5.6°
6.1° / 3.9°
37° - 43° / 2.8° - 6.1°
6.7° / 4.4°
38° - 44° / 3.3° - 6.7°
7.2°/ 5°
39° - 45°/ 3.9° - 7.2°
DISPLAY
Current cut-out temperature will display for approximately 5
seconds. Display will return to current refrigerator temperature.
DISPLAY
Current cut-out temperature displayed and °F will fl ash.
New cut-out temperature displayed.
New cut-out temperature blinks three times, then current
refrigerator temperature will display.
6
Fig. 7
38
°F