EAC – WC (EWC) Efficient cooling units

Operating limits
  Standard execution cooling cold water setpoint depends on fluid type used, for water the minimal setpoint is 4°C (for more details refer to the technical documentation ACS).  Heating mode during recovery – maximal hot water production setpoint is 55°C. 

External control
  Every unit could be controlled by external On/Off signal to the main controller and also sends alarm signal to the external controls.

Alpenta Control System (ACS)
  Sophisticated control system ensures data collection and subsequent control in real time to ensure maximum operating efficiency with respect to energy savings and service life of technological components of the unit. Main functions of the application take care of:
   – Cooling / heating power control based on measured parameters while simultaneously dynamically adapting the unit’s power to maximize energy efficiency.
   – Limitation of cooling / heating capacity in situations leading to operation at the limit of technological possibilities of the unit equipment.
   – 3-level alarm system protection against damage caused by operation beyond the technological capabilities of the unit equipment.

Control panel
  Control panel, components and wiring made in accordance with standards EN 60204-1 electrical directive. Single point of power connection, IP 54 protection class, power phase sequence protection and optionally heated control box. Main on/off switch mounted on front panel, numbered, and signed electrical wires to facilitate maintenance and service. All power components (compressors, fans, pumps) are thermally protected.
  HMI interface panel with protective cover mounted or supplied for remote installation on request.

Controller
  Main microprocessor controller pre-configured during factory test with default settings helps fast commissioning on site. Intuitive user interface with 3 level of access user, skilled user and technician.
  RS485 serial communication port allows remote management through control protocols ModBUS® or BacNET®. Optionally Ethernet port available.

Compressors
  Recognized brand hermetic scroll compressors with axial and radial compliance for superior reliability and efficiency, equipped with crankcase heaters. Low sound and vibration level compressors installed on anti-vibration mountings, optionally equipped with sound jackets.
  Electronic control of discharge temperature and motor protection device against high temperature. Discharge check-valve. Compressor operating time and number of starts helps optimize sequencing and service diagnostics.

Water heat exchanger
  Stainless steel AISI 316 plate copper brazed heat exchanger externally insulated with thermal foam and located inside of the chiller casing. Threaded type of water hydraulic connection is located outside of the unit casing.
  3 step antifreeze protection by water pressure differential switch, leaving water temperature NTC sensor and refrigerant low pressure transducer with limitation function of control system.

Heat recovery
  Partial (desuperheater) or full heat recovery stainless steel brazed plate type exchangers located inside of the unit casing. The unit is equipped with an additional water heat exchanger fitted to the compressor discharge line in series or parallel to the air condenser coil. This solution allows to get energy recovery up to 25% with desuperheater.
  Additionally, there is heating mode of control which utilizes 100% of condensing heat as irreversible heat pump. The heated water could be used for sanitary or other applications

Refrigerant circuit
  Brazing of refrigerant circuits made under nitrogen by certified personnel. Each unit refrigerant circuit is factory pressure and leak tested and thereafter vacuumed before being charged 3 bar nitrogen for shipment.
  Each chiller unit is subjected to a functional logic test to guarantee operational quality.
  Cooling circuit is standardly equipped with hermetic or replaceable cartridge type of filter drier, solenoid valve, thermostatic or optionally electronic expansion valve, sight glass with moisture indicator, low pressure switch, high pressure switch with manual reset, discharge temperature sensor, high pressure and optionally low pressure transducer, pressure relief valves where required (EN 378-2) and suction line insulation.
  Additionally, depending on execution of the unit, there are check valves, liquid receiver and accumulator on suction line.

Hydronic circuit
  All parts of hydraulic module are located inside of the chiller or in external casing depending on dimensions.
  Standard parts of hydraulic circuit of a chiller consists of water entering and leaving NTC temperature sensors for both evaporator and condenser, water antifreeze protective differential pressure switch on evaporator side, differential pressure switch on condenser side, water gauge with shut-off valves enabling of measurement pressure difference on the evaporator
  Optionally the chiller could be equipped on evaporator side with centrifugal pump, reserve centrifugal pump with operating balancing and automatic changeover, check valves, shut-off ball valves, membrane expansion vessel with shut-off valve for maintenance, pressure relief valve, water strainer, automatic air valve and drain valve. All piping and vessels are thermally insulated with close-cell foam
  The unit is equipped with condenser inlet water 3-way valve control system and 3-way valve installed in the condenser hydraulic part or delivered separately for additional installation.
  Optionally the chiller could be also delivered with independent hydronic module for condenser side.

Casing
  Unit casing made of galvanized steel sheet metal painted RAL 7035 powdered polyester paint. Optional rubber or spring anti-vibration mounts reduce transfer of vibrations to the supporting structure.
  Low noise option with fully closed chiller casing on request.