Air Cooled Screw Chillers R134A by New Arora Enterprises

• Series 375 to 635 KW (AHRI-certified series)-5 models in capacities of 375,525,555,625 & 635 KW. This series has been certified by AHRI.
• Series ???:495 to 1395 KW - 9 models in capacities of 495,765,875,915,985,1055,1155,1255,1395 KW.

Compressor

The salient features of these compressors are:

• Highly efficient and low noise levels.
• Due to few moving parts and slider valve, these compressors have minimal wear and tear, thereby, resulting in longer life of the compressor.
• This compressor has stepless capacity control, from 25% to 100% making it suitable for varying load applications and efficient under part load conditions. The capacity control also helps in limiting the starting current and the loading is done steplessly.
• Due to its inherent characteristics, screw compressor has the highest volumetric efficiency and derating at higher temperature is negligible.
• Each compressor has the latest 5 to 6 patented profile design with separate radial and axial force bearings, built-in oil separator, PTC motor winding protection,discharge temperature protection with its controller, oil level switch and oil differential pressure switch. This guarantees reliability and long life of bearings under heavy working operating conditions.

Cooler

The shell and tube evaporator has been built using imported, internally enhanced and highly efficient finned copper tubes and has been optimised for refrigerant and water velocities. The expansion of the tube is done with torque controlled process.

Air Cooled Condenser

• Fin and tube condensers are manufactured using Super Slit aluminum fins. The cooper tubes used are inner grooved type with higher height trapezoidal cross section to increase the internal surface area of heat transfer.

Acoustic Enclosure

An acoustic enclosure can be optionally provided for the compressor to reduce the noise levels.

Electronic Expansion Value

The units are incorporated with electronic expansion values for precise control of refrigerant flow through the cooler to accurately maintain the desired superheat. The expansion value is very sensitive to load variations and adjusts the flow of the refrigerent with short response times to achieve power savings. The microprocessor-based control panel provides the signals for accurate operation of the expansion value based on the superheat.

Microprocessor Control Panel

• The cooler outlet temperature can be controlled accurately within a tolerance of ± 0.5???.
• In-built time delays for compressors and condender fans, single phase/phase reversal protection and anti-freeze protection.
• Password protection at three levels.
• RS 232 and RS 485 ports for remote connectivity,fault indication and status facility.
• PC connectivity and remote monitoring without BMS through dedicated telephone line and optional gateway and modem.
• BMS compatibility with Modbus RTU or Johnson N2 as a standard feature. Optional translators available for compatibility with BACnet IP or Modbus IP
• Windows based support system provides complete staus on all operation both locally and remotely. History, static and dynamic graphing is standard to aid in commissioning, trouble shooting and evaluation.