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Translation from original instructions
5.3 Control and safety devices
The unit is integrally managed by an electronic microprocessor control that, through the various temperature and pressure
sensors installed in the unit, keeps its operation within the safety limits.
All the parameters involved with control of the unit are shown in the “Control Manual” that is an integral part of the docu
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mentation of the unit.
The manual fully describes the logic with which the checks of the unit take place during the various operating stages.
The devices are shown in the Technical Catalogue.
5.4 Principles of operation
The principle of these units is based on using the vapour compression refrigeration cycle, characterized by 4 phases (com
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pression, condensation, throttling and evaporation).
This cycle produces heat transfer from a fluid at lower temperature to a fluid at higher temperature, which is the opposite
of what happens naturally.
In our specific case, these units consist of one or more refrigerant circuits that cool the water of a hydraulic circuit inside a
heat exchanger (“evaporator”) and reject the heat through air heat exchangers (“condensers”). This happens in units inten
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ded for operation in cooling mode.
In units in heat pump operation, where hot water is produced, there is cycle reversal that reverses the function of the two
heat exchangers so that the water heat exchanger becomes the condenser and the air heat exchanger becomes the eva-
porator.
5.5 Structure
The structure is made of galvanized sheet-iron coated with polyester powder at 180°C, which makes it highly resistant to
weather conditions. All screws and bolts are stainless steel.
The structure is a load-bearing frame, with removable panelling lined with sound absorbing expanded.
5.6 Specifications
Air-condensed water chiller unit with hermetic scroll compressors, axial fans and dry-expansion plate evaporators.
