Aircooled chiller Blue Box BETA 94 kW

SPECIFICATIONS
Water chiller unit with hermetic scroll compressors, air heat rejection with centrifugal fans and user-side plate heat exchanger.
Refrigerant fluid: R410A
STRUCTURE
The structure of the unit is made of galvanized sheet-iron coated with polyester powder RAL 7035 at 180°C, which makes it highly resistant to weather conditions.
The structure is a load-bearing frame, with removable panelling lined with sound absorbing expanded polyurethane matting.
All screws and bolts are stainless steel.
COMPRESSORS
The compressors are hermetic orbiting spiral scroll compressors connected in tandem. They are provided with oil level sight glass, internal Klixon® thermal overload protection or external Kriwan© module (depending on the model) and oil equalisation line.
The compressors are enclosed in a dedicated technical compartment, which can be accessed by removing the panelling that allows maintenance operations to be carried out even with units running.
All the compressors are fitted as standard with crankcase heater.
SOURCE-SIDE HEAT EXCHANGER
For the cooling only units, the exchangers are made with microchannel aluminium coils.
For /HP units, finned pack coils with copper tubes and aluminium fins are used. These also have a special circuit for keeping the lower part of the coil free of ice by circulation of gas at high temperature.
Thanks to continuous research in the field of metal alloys and to sophisticated production methods, microchannel coils are made using specific aluminium alloys for the tubes and for the fins. This allows the effects of galvanic corrosion to be drastically reduced to always ensure protection of the tubes that confine the refrigerant. Tubes and fins are also subjected to SilFLUX coating processes (or equivalent) or have zinc added to further increase their corrosion resistance.
If the unit has to be installed in an environment with a particularly aggressive atmosphere, e-coated microchannel coils are available as an option. This option is strongly recommended for applications in coastal or highly industrialized areas.
The use of microchannel coils compared to conventional copper/aluminium coils reduces the total weight of the unit by about 10% and gives a reduction in refrigerant charge of at least 30%.
To protect the exchangers from corrosion and ensure optimal operation of the unit, we advise following the recommendations given in the user, installation and maintenance manual for cleaning the coils.
For installations within a kilometre of the coast, the use of Cu/
Al coils with anti-corrosion treatment is strongly recommended for cooling only units too.
The exchanger is protected by a metal mesh.
The /HP units are fitted as standard with condensate collection tank placed under the coil. The tank has one or more connections to which the customer must connect with pipes of suitable diameter, to direct the condensate from defrost cycles to a drain.
FANS
The standard fans are statically and dynamically balanced dual suction centrifugal fans with forward-curved blades, with belt and pulley transmission, connected to three-phase 4-pole electric motors. The fan includes a safety guard in conformity with standard UNI EN 294.
Alternatively, the unit can be requested with /RFA or /RFE option that uses radial fans with backward-curved blades with directly coupled motor.
All units have vertical exhaustion as standard and, for the basic unit, the available pressure is 50Pa. Horizontal exhaustion and higher pressures are available as accessories.
USER-SIDE HEAT EXCHANGER
The exchanger is a braze-welded stainless steel plate heat exchanger, insulated with a shroud of closed-cell insulating material.
For dual circuit models, the unit uses two exchangers already manifolded inside the unit and therefore with a single hydraulic connection.
The exchanger is also equipped with thermostat-controlled anti-freeze heater to protect it from ice formation when the unit is not running.
REFRIGERANT CIRCUIT
Each refrigerant circuit of the basic unit (cooling only) comprises:
• valve on the liquid line
• charging valves
• liquid sight glass
• replaceable solid cartridge dehydrator filter (except for sizes
3.2, 4.2 and 5.2 where the filter is a weld-on filter)
• thermostatic expansion valve with pressure equalization
• high and low pressure switches
The pipes of the circuit and the exchanger are insulated with extruded closed-cell expanded elastomer.
As an accessory, all the units can be fitted with an electronic expansion valve that allows machine stability to be reached more quickly and better superheating control than the mechanical expansion valve, to maximize the use of the evaporator in all load conditions.
ELECTRICAL CONTROL PANEL
The electrical control panel is made in a painted galvanized sheet-iron box with forced ventilation and IP54 protection rating.