WATER-COOLED SCREW COMPRESSOR
LIQUID CHILLERS 30HXC 080-375
Features and advantages
■■ 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.
■■ 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
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Pro-Dialog Plus operator interface
Water cooled mono circuit
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CONTROLS
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 preventive protection and
enhances chiller reliability.
■■ Equalisation of compressor operating hours
■■ No capillary tubes or pressostats (except as safety device)
■■ Pro-Dialog Plus monitors all chiller safety parameters.
■■ The fault history function and the fault codes facilitate
immediate location of faults and in certain cases the
condi-tions causing the alarm. Prognostic and preventive
mainte-nance functions (incorrect water loop, oil filter dirty
etc.) permit anticipation of possible problems.
HEATING HEATING
Simple to service
Controls
Pro-Dialog Plus is an advanced numeric control system that
combines intelligence with great operating simplicity.
COOLING
Easy installation
AIR TREATMENT
■■ 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 op timised part-load
efficiency and minimised starting current.
■■ Series star/delta starter, limiting the start-up current on
30HXC 080-190 units.
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