WATER-COOLED SCREW CHILLERS 30XWH 254-1762
Features and advantages
Low energy consumption
Eurovent energy efficiency class “A” The high energy efficiency is reached through: - Twin-rotor screw compressor equipped with a highefﬁciency motor and a variable capacity valve that permits exact matching of the cooling capacity to the load. - Flooded multi-pipe heat exchangers for increased heat exchange efﬁciency. - Electronic expansion device permitting operation at a lower condensing pressure and improved utilisation of the evaporator heat exchange surface. - Economizer system with electronic expansion device for increased cooling capacity (30XW-P).
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 30XW units offer increased global performance as well as Carrier’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 cooler size and ﬂuid type. Auto-adaptive control - Control algorithm prevents excessive compressor cycling (Carrier patent) - 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).
Low operating sound levels
Standard unit features include: - Silencers on the compressors discharge line. - Silencers on the economiser return line. - Acoustic insulation on the components that are most subjected to radiated noise. - Option 257 further reduces the global unit sound level.
Easy and fast installation
Compact design - The 30XW units are designed to offer the most compact dimensions on the market. - With a width of approximately 1 m up to 1600 kW the units can pass through standard door openings and only require minimum ﬂoor space in the plant room.
Compact, accessible unit - side view sizes up to 1600 KW
06T screw compressor
Simplified electrical connections - Main disconnect switch with high trip capacity - Transformer to supply the integrated control circuit (400/24 V) Simplified hydronic connections - Victaulic connections on the evaporator and condenser - Practical reference marks for entering and leaving water connections - Possibility to reverse the heat exchanger water inlet and outlet at the factory - Possibilty to modify the number of heat exchanger passes Fast commissioning - Systematic factory operation test before shipment - Quick-test function for step-by-step veriﬁcation of the instruments, expansion devices and compressors.
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