R-134a refrigerant • HFC refrigerant with zero ozone depletion potential - Leak-tight refrigerant circuit • Reduction of leaks as no capillary tubes and flare connections are used • Verification of pressure transducers and temperature sensors without transferring refrigerant charge • Discharge line shut-off valve and liquid line service valve for simplified maintenance.
High reliability and easy servicing
- The units offer increased global performance as well as Ciat’s acclaimed product quality and reliability - Major components are selected and tested to minimize failures possibility, as well as many design choices have been taken in this perspective. - 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. - Refrigerant circuit Two independent refrigerant circuits (from 1000 kW upwards); the second one automatically takes over, if the first one develops a fault, maintaining partial cooling under all circumstances. - Evaporator • Electronic paddle-free flow switch. Auto-setting according to exchanger size and fluid type. - Auto-adaptive control • Control algorithm prevents excessive compressor cycling • Automatic compressor unloading in case of abnormally high condensing pressure. - Exceptional endurance tests • Partnerships with specialised laboratories and use of limit simulation tools (finite element calculation) for the design of critical components. • Transport simulation test in the laboratory on a vibrating table and then on an endurance circuit (based on a military standard).
The new generation of CIAT screw compressors benefits from UTC's long experience in the development of twin-rotor screw compressors. The compressor is equipped with bearings with oversized rollers, oil pressure lubricated for reliable and durable operation, even at maximum load. A variable control valve controlled by the oil pressure permits infinitely variable cooling capacity. This system allows optimal adjustment of the compressor cooling capacity and ensures exceptionally high stability of the chilled water leaving temperature. Among the other advantages: if a fault occurs e.g. if the condenser is fouled or at very high water temperature, the compressor does not switch off, but continues operation with a reduced capacity (unloaded mode). The silencer in the discharge line considerably reduces discharge gas pulsations for much quieter operation. The condenser includes an oil separator that minimises the amount of oil in circulation in the refrigerant circuit and re-directs it to the compressor function.
HEAT PUMPS - AIR CONDITIONING - REFRIGERATION - AIR HANDLING - HEAT EXCHANGE - NA 17.01 A