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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-
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
-
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 user hydraulic circuit in
-
side a heat exchanger (“evaporator”) and reject the heat through another water heat exchanger (“condenser”) on a source
circuit.
This happens in units intended for operation in cooling mode.
In the "OH" versions, hot water is produced since the condenser is connected to the user hydraulic circuit and the evapora
-
tor is connected to the source hydraulic circuit.
In the "HPW" versions, both hot and cold water are produced with seasonal reversal of the hydraulic connections.
In "LC" version units, the same functionalities made by the heat exchanger connected to the source hydraulic circuit are
made by a remote air heat exchanger.
5.5 Structure
The structure consists of epoxy polyester powder coated sheet steel profiles.
The electrical control panel is made of an epoxy polyester powder coated sheet steel box.
Units in LN set-up are fully panelled with epoxy polyester powder coated steel sheet panels, lined with matting made of
sound absorbing material.
In addition to the features present in the LN version, units in XLN configuration have a jacket made of sound absorbing
material on each compressor and an insulation in the delivery and suction pipes.
5.6 Specifications
Water-condensed water chiller unit with semi-hermetic screw compressors, dry-expansion shell-and-tube evaporators and
condensers.
