WATER-COOLED SCREW COMPRESSOR LIQUID CHILLERS 30HXC 080-375
Features and advantages
Quality design and construction make the 30HXC unit the preferred choice. Non-controlled, Non-ozone depleting HFC-134a refrigerant. HCF-134a is a proven, non-toxic, non-ﬂammable refrigerant. Medium-pressure refrigerant HFC-134a minimises stress on the compressors and ensures their long operating life. The 30HXC units are equipped with screw compressors for extremely quiet operation and low-vibration levels. The 30HXC units exceed the efﬁciency level of average industry standards for both full- and part-load operation, saving on operating costs, through lower electrical costs. Part of the 30HXC product range is available equipped with the very low temperature option that permits evaporator leaving water temperatures down to -10°C with ethylene glycol or down to -7°C with propylene glycol. The 30HXC control is fully automatic. The leaving water temperature is continuously monitored to detect load and ﬂow changes. This combination provides the most precise temperature control available. Two independent refrigerant circuits - the second one takes over automatically, when the ﬁrst one malfunctions, maintain-ing partial cooling under all circumstances. Easy installation - the 30HXC chillers are supplied with a full refrigerant charge, and conveniently located power supply and water inlet and outlet connections. Auto-diagnostics - quick display of the machine status. Multiple compressor concept for optimised part-load efﬁciency and minimised starting current. Series star/delta starter, limiting the start-up current on 30HXC 080-190 units. All units are also available as high condensing temperature and non-reversible heat pump versions (options 150 and 150A). Their application range is the same as for the standard units, on which they are based, but they also allow condenser leaving water temperatures of up to 63°C. Pro-Dialog control offers all the advantages of the standard units, plus control of the leaving condenser water temperature.
The 30HXC has a compact design that ﬁts through a standard door opening and requires minimal indoor space. The 30HXC is supplied as a complete package for easy installation. There are no extra controls, timers, starters or other items to install. 30HXC units have a single power point and one main disconnect/isolator switch for sizes 30HXC 080 to 190, and one power point and one main disconnect/ isolator switch per circuit for sizes 30HXC 200 to 375. The hydraulic connections are simple and facilitated by the use of Victaulic connections for the evaporator and condenser.
Simple to service
HEATING HEATING CONTROLS
243 Mechanically-cleanable evaporator and condenser Twin-screw compressors which require minimum routine service or maintenance. Easily accessed suction and discharge pressure and temperature information via a display module.
Pro-Dialog Plus control
Pro-Dialog Plus is an advanced numeric control system that combines intelligence with great operating simplicity. Pro-Dialog Plus ensures intelligent leaving water temperature control and optimises energy requirements. The PID control algorithm with permanent compensation for the difference between the heat exchanger entering and leaving temperature, anticipates load variations, guarantees leaving water temperature stability and prevents unnecessary compressor cycling. The long-stroke electronic expansion valves (EXV), together with refrigerant level control via heat exchange in the evaporator, allows a signiﬁcant energy efﬁciency improvement at part load conditions, and faultless chiller operation in a wider temperature range. Adjustable ramp loading, according to the inertia of the application, avoids load increases that are too fast and too frequent, increasing unit life and limiting power consump-tion peaks. Several capacity loading possibilities ensure improved start-up at low outdoor air temperature, and permit use of one of the refrigerant circuits as a back-up circuit. Pro-Dialog Plus ensures prev