7
Dynamics of Temperature Settings
Danfoss BD35F compressor
The compressor is controlled by the digital thermostat setting.
The Danfoss BD35F compressor is used on all of the National Luna fridge/freezer product range.
Developed in Germany, it has a unique Multi - Speed (2,000 - 3,500 rpm) capability which makes it
ideal for use in all mobile applications up to an angle of 35 degrees. It can function efficiently in ex
-
treme conditions where it is not uncommon to have ambient temperatures above 40ºC.
Inner Bin / Cooling Compartment
To control temperature, the thermostat sensor must be placed in a position in order to take a tempera-
ture reading.
For practical purposes National Luna has elected to place this temperature sensor on the metal surface
forming the interior bin of the fridge/freezer. Thus the switching on and off of the compressor will be
controlled by the bin surface area temperature.
The inner volume of the cooling bin (i.e. core/centre temperature) will take time to “pull down” to
equalise the bin temperature. (In practise it is common that the set temperature will be within 3ºC of the
core temperature).
Ambient temperatures surrounding the fridge must also be taken into consideration. Very high outside
temperatures will play a major role in the running time of the fridge. (e.g. The fridge will run longer to
maintain or reach the target temperature set).
When setting temperatures below -12ºC the refrigeration system will have a
larger temperature range between switching on and off
