The 30HXC units are water-cooled chillers, designed from
the ground up to meet the needs of today and tomorrow:
- ecological HFC-134a refrigerant
- screw compressors
- fits through a standard door with no disassembly
required.
- mechanically cleanable evaporators and condensers
All units are equipped with PRO-DIALOG Plus control to
optimize the efficiency of the refrigerant circuit.
Features
Quality design and construction make the 30HXC unit the
preferred choice.
Non-controlled, ozone-benign HFC-134a refrigerant.
HCF-134a is a proven, non-toxic, non-flammable refrigerant
which will have the highest usage of any new refrigerant.
Medium-pressure refrigerant HFC-134a minimizes 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.
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, maintaining
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 optimized part-load efficiency
and minimized starting current.
Series star/delta starter, limiting the start-up current on
30HXC 080-190 units.
30HXC 080-375 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.
30HXC - 50 HZ
Nominal cooling capacity 290-1286 kW
Water-Cooled Screw Compressor Liquid Chillers
Carrier is participating in
the Eurovent Certification
Programme. Products are
as listed in the Eurovent
Directory of Certified
Products.
Easy installation
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
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 consumption
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 conditions
causing the alarm. Prognostic and preventive maintenance
functions (incorrect water loop, oil filter dirty etc.)
permit anticipation of possible problems.
PRO-DIALOG Plus offers extended communications
capabilities
Clear and easy-to-understand operator interface. The LEDs,
numeric displays and touch keys are well-positioned on the
schematic chiller diagram. The user immediately knows all
operating parameters: pressures, temperatures, operating
hours, etc.
The extensive chiller remote control capabilities (wired
connection) allow integration into building monitoring systems
(see Technical Description)
RS485 series port for connection to the Carrier Comfort
Network (CCN) or any other monitoring system (optional
communications interface with open protocol allows transfer
of almost 40 parameters).
Parallel piloting of two units as standard, or of several units
with Flotronic System Manager (FSM) and Chiller System
Manager (CSM III) options.
The control permits:
- Control in master/slave configuration of two units operating
in parallel.
- Programming of operating time schedules (up to 8 periods
per week)
- Programming of operating time schedules for the second
set point (up to 8 periods per week)
- Definition of operating time period with demand limit.
- Integration of the unit into a building monitoring system
(BMS): serial port RS 485.
Control of the customer’s water pump (dual pump with
automatic change-over optional).
Control at the second set point (example: room unoccupied).
Set point reset as a function of the air temperature or the
difference between entering and leaving water temperature.