Description Of The Unit's Work Cycle; Diagram Of The Unit's Electrical System - Carrier DB-S Series Use & Maintenance Instructions

8.1 Description of the unit's
work cycle
8.2 Room temperature setting
8.3 Diagram of the unit's
electrical system
8 8 . . H H O O W W T T O O O O P P E E R R A A T T E E T T H H E E U U N N I I T T
8 8 . . H H O O W W T T O O O O P P E E R R A A T T E E T T H H E E U U N N I I T T
Uniblock DB-S refrigerating units operate through a scroll refrigerating compres-
sor, powered by mains a/c supply (single phase or three phase) and use HFC
refrigerating liquids.
The refrigerating liquids, flowing through the evaporator exchange battery cool
the room that contains the battery. Then, flowing through the condenser exchan-
ge battery, it regains its cooling capacity and the cycle starts again.
A pre-set automatic defrosting phase is also envisaged, although the user can
modify it if he so wishes. The frequency of the cycle is controlled by a timer.
Defrosting takes place by means of an electrical resistance circuit.
After placing into service the unit (paragraph 7) it is possible to adjust the room
temperature set-point.
CAUTION:
medium temperature setting range: +10° - 5°C
low temperature setting range: -15 - 25°C
Cell temperature programming:
Press key (10) to turn ON unit.The actual room temperature will be shown on the
display (5).In this condition the unit is ready for programming.It is necessary the-
refore to set the required room temperature bearing in mind the limits of the
range which the unit is able to operate.
Press the SET (6) key (the yellow LED will light).The last set temperature will be
displayed on the display screen (5) which showes the set value.
Press the set key (6): the yellow led will light for one second and the display (5)
will start flashing a few seconds later, indicating the set temperature. If you wish
to change the setting, use the following keys:
(8) to raise set temperature
(7) to lower set temperature
Once the required setting is displayed, press the set key (6) to confirm.
The unit is now fully operational and no other programming is required. The refri-
gerating cycle is fully automatic according to factory-set parameters, that can
eventually be modified by authorised personnel only.
Units in the DB-S range feature a special electrical system, a diagram of which is
attached to this manual.
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