Follett EREF Series Handbuch für Installation, Betrieb und Wartung - Seite 6
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Controller Operation
In normal operation the controller displays cabinet temperatures
in °C. Temperatures are displayed to 1 decimal point.
A snowflake LED displays when the compressor is running.
The controller is pre-programmed with a 4 C set point, which provides a
compressor cut-in at 6 C and cut-out at 4 C. This may not meet
your specific application needs. For example, many pharmaceutical
manufacturers recommend that their refrigerated medications be stored
between 2.2 C and 7.8 C. Instructions for changing the set point are found
below.
Note: Follett presets the EREF4 refrigeration system to hold product
temperature at approximately 4.6 C. If you are storing prepack-
aged food in this unit, the set point should be changed to 2.0 C
with a 2.0 C differential (HY) to maintain food below 4.4 C.
Refer to the chart below for the set point for your application's required temperature range:
Set point
(°C)
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
All set points have a 2 C differential (HY setting on the controller). The 2 C differential means that with a 4 C set point, for
example, the compressor will turn off at 4 C and turn on when it reaches 6 C.
Because refrigerant is present in the evaporator, there can be an additional 0.5 - 0.8 C of downward "drift" in temperature after
the compressor turns off. For example, with a 4 C set point and after the compressor cut-out, the temperature may
momentarily display as low as 3.4 C before beginning to rise again.
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 per
above table
3
Press and release SET
6
EREF Refrigerator
Cut-in/ Cut- out
(°C)
3.0/1.0
4.0/2.0
5.0/3.0
6.0/4.0
7.0/5.0
8.0/6.0
9.0/7.0
10.0/8.0
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 °C will flash.
New cut-out temperature displayed.
New cut-out temperature blinks three times, then current
refrigerator temperature will display.
Fig. 7
Normal display range temperature
(°C)
0.5 - 3.0
1.4 - 4.0
2.5 - 5.0
3.4 - 6.0
4.4 - 7.0
5.3 - 8.0
6.3 - 9.0
7.2 - 10.0
4.0