Lauda VF 20040 C, Operating Instructions Manual

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7 Function description
LAUDA Versafreeze chest freezer models VF 20040 C, VF 55040 C and VF 75040 C are equipped with a high-perfor-
mance compressor and operate within a variable temperature range of -0 °C to -40°C. Models VF 20085 C, VF 55085 C
and VF 75085 C are equipped with two high-performance compressors and operate at a temperature range between -
50 °C and -86°C. The air-cooled condenser at the back of the appliance releases heat extracted from the refrigeration
compartment into the room. The temperature controller maintains a constant temperature in line with the preset value.
The current temperature in the refrigeration compartment is shown on the controller display.
The devices are optimized for operation at the respective maximum target temperature, at which they also achieve their
optimum temperature stability (over time). The more the set target temperature deviates from the optimal operating tem-
perature, the greater the temperature stability.
Function of the data logger, history
The data logger starts automatically and records the temperature in the refrigeration compartment, the condenser tem-
perature, and the internal battery voltage every 120 seconds. Different views, e.g. days or hours, can be selected by tap-
ping the "Data logger, history" symbol.
To view past events, tap the symbol to open a window for setting the start and end dates. Now choose the desired start
and end dates, tap to select, then press OK to confirm. Tap an hour or day to return to the current display.
The data logger is equipped with a 1 GB industrial SD card and can therefore record data for 2 years before the memory is
full. When the memory is full, the oldest data is overwritten first so that only the most recent data is retained.
We recommend exporting the data, e.g. every six months, depending on its importance, or performing more regular back-
ups (see Data transfer via USB).
Selection of displayed control curves:
Briefly tapping the symbols An1, A2F, or ba1 shows the designation of the symbols on the left of the display.
All three control curves are selected by default. In order to display only one control curve, the other control curves must
be deactivated. To deactivate a control curve, press the corresponding symbol and hold for approx. 3 seconds.
The symbol turns white and the control curve disappears. To activate the control curve, press the deactivated white symbol
and hold for approx. 3 seconds until it reverts back to its original color.
Blue (An1)
= Refrigeration compartment (compartment temperature)
Purple (A2F) = Condenser (condenser temperature)
Orange (ba1) = Battery (internal battery voltage)