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1.3.2 Display case operation
The useful volume of the refrigerated display case is cooled based on the principle of heat transfer from the
useful volume of the display case to the environment. The heat from the useful volume is carried into the
evaporator, compressor transfers it by the refrigerant to the condenser, and then it is removed to the
environment.
The refrigerated display case operation is the operation of its refrigeration system controlled by an electronic
regulator (controller). The controller's temperature sensor reads the air temperature in the useful volume of the
display case, when the set temperature is exceeded, the solenoid valve opens and the refrigerant is supplied to
the evaporator. When the desired temperature is reached in the useful volume of the dis-play case, the controller
switches off and closes the solenoid valve, thereby cutting off the refrigerant supply to the evaporator. The
evaporator defrosting time and frequency are determined by the controller settings.
The control panel consists of:
1. Electronic controller.
2. Illuminated key switch.
Figure 3 - Control panel
The electronic controller (1) is used to automatically maintain the temperature in the refrigerated space and
control the air cooler defrosting process. See the Electronic Controller User's Manual in Appendix D to the
Manual. The factory setting ensures optimal operation of the product. The controller can be readjusted by the
service personnel only. The switch (2) is used to turn the lighting on and off. The interior of open display cases is
insulated by an air curtain (an invisible air flow barrier between the upper honeycomb and the lower suction
panel).
Warning: Do not block the cooled air supply for the air curtain (by goods, labels, price tags, etc.)
To reduce energy consumption during off-hours, the display cases can be optionally equipped with night covers
(Fig.4). In order to prevent the refrigeration loss, as well as to ensure perfect sanitary conditions, the display case
can be closed with a night cover, available on request as an option, for the night time.
Figure 4 - Night cover
