EWAD D

AIR COOLED CHILLER

Air cooled screw chiller, standard efficiency, standard sound

CAPACITY50-170 TR

› 2 truly independent refrigerant circuits

› Stepless single-screw compressor

› Large operation range (ambient temperature down to -18°C)

Features and advantages

Low operating cost

This chiller range is the result of careful design, aimed to optimize the energy effi ciency of the chillers, with the objective of bringing down operating costs and improving installation profi tability, effectiveness and economical management.

The chillers feature a high effi ciency single rotor screw compressor design, large condenser coil surface area for maximum heat transfer and low discharge pressure, advanced technology condenser fans and a ‘plate to plate’ or ‘shell&tube’ evaporator with low refrigerant pressure drops.

Low operating sound levels

Very low sound levels both at full load and part load conditions are achieved by the latest compressor design and by a unique new fan that moves large volume of air at exceptionally low sound levels and by the virtually vibration-free operation.

Excellent serviceability

Field serviceability has not been sacrifi ced to meet design performance objectives. The compressor is equipped with discharge, liquid and suction shut off valves. The compressor and serviceable components such as fi lter-driers are located on the outside edges of the base allowing, together with the shape of the coil, an easy access for inspection and service. Moreover, the MicroTech III controller gives detailed information on the causes of an alarm or fault.

Proven reliability

Full factory testing of every unit with water hook-up helps in providing a trouble-free start-up. Extensive quality control checks during testing means that each equipment protection and operating control is properly adjusted and operates correctly before it leaves the factory.

Cooling capacity control is infi nitely variable by means of a single screw compressor controlled by microprocessor system. Each unit has infi nitely variable capacity control from 100% down to 12.5%. This modulation allows the compressor capacity to exactly match the building cooling load. Chilled water temperature fl uctuation is avoided only with a stepless control.

In the case that the compressor with load step control is used, the compressor capacity, at partial loads, will be too high or too low compared to the building cooling load. The result is an increase in chiller energy costs, particularly at the part-load conditions at which the chiller operates most of the time.

Units with stepless regulation offer benefi ts that the units with step regulation are unable to match. Only a chiller with step-less regulation, is able to follow the system cooling demand at any time and to deliver chilled water at set-point.

Superior control logic

The new MicroTech III controller provides an easy to use control environmental. The control logic is designed to provide maximum effi ciency and a history of unit operation. One of the greatest benefi ts is the easy interface with LonWorks, Bacnet, Ethernet TCP/ IP or Modbus communications.