19XR, XRT
High Efficiency
Hermetic Centrifugal Liquid Chiller
50/60 Hz
HFC-134a
19XR - 350 to 800 Nominal Tons (1230 to 2813 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: