19XR, XRT
High Efficiency
Hermetic Centrifugal Liquid Chiller
50/60 Hz
HFC-134a
19XR - 200 to 1500 Nominal Tons (703 to 5357 kW)
19XRT - 350 to 525 Nominal
Tons (1230 to 1845 kW)
Carrier's Evergreen chillers offer the best value in high-efficiency chlorine-free centrifugal chillers.
Today's customers demand
high-efficiency products with exceptional value. Carrier's Evergreen centrifugal
chillers provide this value by achieving energy efficiency levels approaching
0.50 kW/Ton (0.142 kW/kW) utilizing proven technology designed specifically
for chlorine-free refrigerant. This combination ensures the most cost-effective,
reliable solution for today's comfort cooling and process cooling applications.
These high efficiencies can be achieved through the use of our optional
patented turbine technology.
In a technological breakthrough
that represents the only major change to the basic vapor compression refrigeration
cycle since 1922, Carrier has significantly reduced the power consumption
of HFC-134a positive-pressure chillers. The result is ultra-high energy
efficiencies, giving the Evergreen chillers the highest efficiency of any
chlorine-free chiller in the world.
Features/Benefits
The Evergreen chillers feature:
High energy efficiency
- Innovative product designs, utilizing proven technology, result in high
energy efficiency levels - approaching 0.50 kW/ton (0.142 kW/kW) for the
19XRT.
Environmentally-preferred
HFC-134a refrigerant - The Ever-green chillers use chlorine-free HFC-134a
refrigerant with zero ozone-depletion potential. As the refrigerant of
choice for automotive and appliance manufacturers, HFC-134a production
continues to rise, assuring a plentiful supply of refrigerant at reasonable
prices in the years to come.
Positive pressure design
- The Evergreen™ chiller's positive pressure design reduces the chiller
size by up to 35% compared to low-pressure designs. The smaller size minimizes
the need for valuable mechanical room floor space. In addition, positive
pressure designs eliminate the need for costly low-pressure containment
devices, reducing the system first cost.
Mix-match capability
- The chillers provide a complete line of compressors and heat exchangers,
ensuring the optimal combination of machine components regardless of tonnage,
lift, and efficiency specifications.
Modular construction
- The cooler, condenser, and compressor assemblies are completely bolted
together, making the Evergreen chillers ideally suited for replacement
projects where ease of disassembly and re-assembly at the jobsite are essential.
Marine container shipment
(19XR only) - The compact design allows for open-top container shipment
to export destinations, ensuring product quality while reducing shipping
cost.
Optional refrigerant isolation
valves - This system allows the refrigerant to be stored inside the
chiller during servicing, reducing refrigerant loss and eliminating time-consuming
transfer procedures. As a self-contained unit, the Evergreen chillers can
be applied to applications that incorporate more than one type of refrigerant
without the costly penalty of requiring additional remote storage systems.
Optional pumpdown unit
- Combined with the refrigerant isolation valves listed above, the optional
pump-down unit eliminates complex connections to portable transfer systems,
thereby reducing service costs. In addition, the optional pumpdown compressor
meets EPA's vacuum level requirements that mandate minimizing refrigerant
emissions during service.
Optional unit mounted
starter - Available in low-voltage wye-delta and solid state, Carrier's
unit mounted starter provides a single point power connection, reducing
machine installation time and expense.
Hermetic compressor features:
Single-stage design
- This design increases product reliability by eliminating the additional
moving parts associated with multiple stage machines, such as additional
guide vanes and complex economizers.
Variable inlet guide vanes
- The guide vanes are connected with aircraft-quality cable and controlled
by a precise electronic actuator. Chilled water temperature is maintained
within ± .5 F (.3 C) of the desired set point without surge, cavitation,
or undue vibration. The vanes regulate inlet flow to provide high efficiency
through a wide, stable operating range with-out hot gas bypass.
Aerodynamically-contoured
impellers - Impellers that utilize high back sweep main blades with
low-profile intermediate splitter blades are aerodynamically contoured
to improve compressor full-load and part-load operating efficiency.
Patented turbine technology
- The 19XRT utilizes the pressure differential between the condenser and
cooler to supplement motor power. This design recovers energy typically
lost during the vapor compression cycle, significantly reducing power consumption.
The turbine adds only one moving part to the proven 19XR compressor design,
ensuring exceptional product reliability.
Stationary tunnel diffuser
- The stationary diffuser requires no moving or wearing parts, which increases
product reliability. The tunnel design utilizes jet engine technology,
increasing centrifugal compressor peak efficiency.
DynaGlide™ transmission
- Consisting of steel-backed babbitt-lined sleeve bearings, Kingsbury type
self-leveling tilting-pad thrust bearing, and single helical gear, this
transmission ensures smooth, reliable operation over the life of the machine.
Electrically-driven oil
pump - The pump provides the required sup-ply of oil to the DynaGlide
transmission during start-up, operation, and coast down. The pump is supplied
by a separate power line, ensuring an adequate oil supply in the event
of compressor power interruptions.
Microprocessor-controlled
oil heater - The heater prevents excessive absorption of refrigerant
into the oil during compressor shutdown, ensuring a plentiful supply of
undiluted lubrication oil in the oil sump.
Refrigerant-cooled oil
cooler - Refrigerant cooling eliminates field water piping, reducing
installation expense.
Hermetic motors -
The motors are hermetically sealed from the ma-chine room; cooling is accomplished
by spraying liquid refrigerant on the motor windings. This highly efficient
motor cooling method results in the use of smaller, cooler-running motors
than could be realized with air-cooled designs of the same type. Thus,
hermetic motors require less inrush current and are smaller and lighter
than comparable air-cooled motors.
In addition, Carrier's hermetic design eliminates:
Run testing - Compressors
are 100% run-tested to ensure proper operation of all compressor systems,
including oil management, vibration, electrical, power transmission, and
compression.
Heat exchangers feature:
ASME certified construction
- This standard requires the use of an independent agency to certify the
design, qualification and testing of all heat exchangers, ensuring the
ultimate in heat exchanger safety, reliability, and long life.
High performance tubing
- Tubing with internally and externally enhanced fins improves machine
performance by reducing the overall resistance to heat transfer.
Cooler tube expansion
- Cooler tube expansion at intermediate support sheets prevents unwanted
tube movement and vibration, thereby reducing the possibility of premature
tube failure.
Double-grooved tube sheet
holes - This design eliminates the possibility of leaks between the
water and refrigerant system, increasing product reliability.
Condenser baffle -
The baffle pre-vents direct impingement of high velocity compressor gas
onto the con-denser tubes. The baffle eliminates the related vibration
and wear of the tubes and distributes the refrigerant flow evenly over
the length of the vessel for improved efficiency.
Closely spaced intermediate
support sheets - Support sheets prevent tube sagging and vibration,
thereby increasing heat exchanger life.
Refrigerant filter isolation
valves - These valves allow filter replacement without pumping down
the chiller, which means less service time and less expense.
FLASC (Flash subcooler)
- The subcooler, located in the bottom of the condenser, increases the
refrigeration effect by cooling the condensed liquid refrigerant to a lower
temperature; the result is reduced compressor power consumption.
AccuMeter™ (19XR only)
- The AccuMeter system regulates refrigerant flow according to load conditions,
providing a liquid seal at all operating conditions and eliminating unintentional
hot gas bypass.
Microprocessor controls feature:
Direct digital Product
Integrated Control (PIC) - Carrier's PIC provides unmatched flexibility
and functionality. Each unit integrates directly with the Carrier Comfort
Net-work (CCN), providing a system solution to controls applications.
Local Interface Device
(LID) - The LID, which can be configured to display units in English
or metric, provides unparalleled ease of operation. A 16-line by 40-character
LCD (liquid crystal display) features 4 menu-specific soft keys. Default
display offers all in one glance review of key chiller operation data,
simplifying the interaction between machine and user.
Control options module
- The module offers unique control expand-ability by allowing additional
sensors to be connected to the PIC. This module also allows chilled water
reset and demand limit set points to be con-trolled from a remote source.
Automatic capacity override
- This function unloads the compressor whenever key safety limits are approached,
increasing unit life.
Chilled water reset
- Reset can be accomplished manually or automatically from the building
management system. Reset saves energy when warmer chilled water can be
utilized.
Demand limiting -
This feature limits the power draw of the chiller during peak loading conditions.
When incorporated into the Carrier Comfort Network building automation
system, a red line command will hold chillers at their present capacity
and prevent any other chillers from starting. If a load shed signal is
received, the compressors are unloaded to avoid high demand charges whenever
possible.
Ramp loading - Ramp
loading ensures a smooth pulldown of water loop temperature and prevents
a rapid increase in compressor power consumption during the pulldown period.
Automated controls test
- The test can be executed prior to start-up to verify that the entire
control system is functioning properly.
365-day real time clock
- This feature allows for the operator to program a yearly schedule for
each week, weekends, and holidays.
Occupancy schedules
- Schedules can be programmed into the controller to ensure that the chiller
only operates when cooling is required.
Extensive service menu
- Unauthorized access to the service menu can be password-protected. Built-in
diagnostic capabilities assist in trouble-shooting and recommend proper
corrective action for pre-set alarms, resulting in greater up time.
Alarm file - This
file maintains the last 25 time- and date-stamped alarm and alter messages
in memory; this function reduces troubleshooting time and cost.
Battery backup - Battery
backup provides protection during power failures and eliminates time consuming
control reconfiguration.
Encapsulated circuit boards
are designed, built and tested in-house. Each board meets Carrier's stringent
quality standards for superior reliability compared to open board designs.
Other control features include: