AIR-COOLED LIQUID CHILLERS 30XA 252-1702
Features and advantages
Very economical operation
Exceptionally high full load and part load energy efﬁciency: - Eurovent energy efﬁciency class A and B (unit with high-efﬁciency option 119). - Standardised Eurovent values in accordance with EN 14511-3:2013: EER up to 3.3 and ESEER up to 4.2. - New twin-rotor screw compressor equipped with a high-efﬁciency motor and a variable capacity valve that permits exact matching of the cooling capacity to the load. - All aluminium condenser with high-efﬁciency microchannels. - Flooded shell-and-tube evaporator to increase the heat exchange efﬁciency. - Electronic expansion device permitting operation at a lower condensing pressure and improved utilisation of the evaporator heat exchange surface (superheat control). - Economiser system with electronic expansion device for increased cooling capacity. Simpliﬁed electrical connections - Main disconnect switch with high trip capacity - Transformer to supply the integrated control circuit (400/24 V). Fast commissioning - Systematic factory operation test before shipment - Quick-test function for step-by-step veriﬁcation of the instruments, expansion devices, fans and compressors.
R-134a refrigerant - Refrigerant of the HFC group with zero ozone depletion potential - 30% reduction in the refrigerant charge through the use of micro-channel heat exchangers Leak-tight refrigerant circuit - Reduction of leaks as no capillary tubes and ﬂare connec-tions are used - Veriﬁcation of pressure transducers and temperature sensors without transferring refrigerant charge - Liquid line service valve for simpliﬁed maintenance (option).
Low operating sound levels
Compressors - Discharge dampers integrated in the oil separator (Carrier patent). - Silencer on the economiser return line. - Acoustic compressor and oil separator enclosure reducing radiated noise (option). Condenser section - Condenser coils in V-shape with an open angle, allowing quieter air ﬂow across the coil - Low-noise 4th generation Flying Bird fans, made of a composite material (Carrier patent) are now even quieter and do not generate intrusive low-frequency noise - Rigid fan mounting preventing start-up noise (Carrier patent).
Easy and fast installation
Integrated hydronic module (option) - Centrifugal low or high-pressure water pump (as required), based on the pressure loss of the hydronic installation - Single or dual pump (as required) with operating time balancing and automatic changeover to the back-up pump if a fault develops - Water ﬁlter protecting the water pump against circulating debris - High-capacity membrane expansion tank ensures pressurisation of the water circuit - Thermal insulation and aluminium protection (option) - Pressure sensor to check ﬁlter pollution and for direct numerical display of the water ﬂow rate with an estimate of the instantaneous cooling capacity at the control interface - Water ﬂow control valve.
Screw compressors - Industrial-type screw compressors with oversized bearings and motor cooled by suction gas. - All compressor components are easily accessible on site minimising down-time. - Protection increased by an electronic board. Air condenser - All aluminium micro-channel heat exchanger (MCHE) with high corrosion resistance. The all aluminium design eliminates the formation of galvanic currents between aluminium and copper that cause coil corrosion in saline or corrosive environments. Evaporator - Thermal insulation with aluminium sheet ﬁnish (option) for perfect resistance to external aggression (mechanical and UV protection). Auto-adaptive control - Control algorithm prevents excessive compressor cycling (Carrier patent) - Automatic compressor unloading in case of abnormally high condensing pressure. If condenser coil fouling or fan failure occurs, the AquaForce continues to operate, but at reduced capacity Exceptional endurance tests - Partnerships with specialised laborato