23XL
Hermetic Screw Liquid Chiller
50/60 Hz
60 Hz - 160 to 350 Nominal Tons (560 to 1,232 kW)
50 Hz - 130 to 290 Nominal
Tons (460 to 1,020 kW)
The 23XL screw chiller provides
the performance and reliability of a centrifugal class machine
by utilizing advanced engineering technology. Optimized for low
life cycle costs, the 23XL offers superior value in a compact
design.
Features/Benefits
Low operating costs:
Advanced internally and
externally enhanced heat transfer surfaces provide
exceptional thermal performance.
Precise compressor tolerances
in a design optimized for air-conditioning duty provide superior
compression efficiency.
Integral FLASC (FLAsh SubCooler)
increases the refrigeration effect and reduces compressor power
consumption.
Variable refrigerant metering
eliminates inefficient vapor bypass and provides superior part-load
performance when compared to fixed orifice metering designs.
High efficiency hermetic
motors, cooled
by liquid refrigerant, reduce motor electrical losses.
Low installation costs:
A positive pressure design
reduces the size of the chiller by as much as 35% when compared
to negative pressure designs. The reduced machine size results
in lower floor space requirements and easier installation.
The take-apart bolted design
incorporates flanges on all major connections. Disassembly enables
major components to easily fit through tight spaces. This eliminates
the expense and inconvenience of cutting and welding, proving
that the 23XL is an ideal replacement chiller.
Hermetic design
eliminates additional machine room cooling requirements and reduces
installation costs.
Single point electrical
connection, provided
with the optional unit-mounted starter, eliminates start-up problems
caused by miswiring, further reducing installation costs.
Quiet operation
reduces the need for costly sound insulation in acoustically demanding
applications.
Elimination of the purge
device means no
purge vent or water piping is required.
Low maintenance costs:
A field serviceable twin
screw compressor
dramatically reduces maintenance expenses when compared to compressor
exchange programs.
Elimination of the oil
pump, oil cooler, and purge device
equates to fewer parts that require maintenance.
Direct digital controls
provide preventive and predictive maintenance algorithms for increased
machine uptime and reduced service expenses.
Optional refrigerant discharge
isolation valves
enable service personnel to store the refrigerant charge in the
cooler or condenser during servicing.
The hermetic twin screw compressor is designed specifically for air-conditioning and light-brine duty:
Proprietary manufacturing
techniques yield
rotor clearances measured in microns for unsurpassed compression
efficiency.
AFBMA (Anti-Friction Bearing
Manufacturers Association) Class 5 compressor bearings
provide precise rotor positioning to reduce compressor wear. Carrier's
unique design provides the most conservatively loaded bearing
system in the industry.
Bottom-mounted capacity
control slide valve
offers inherently accurate positioning, preventing the wear potential
associated with top-mounted designs.
Motor cooling
is provided via the same simple system proven effective in the
Carrier 19D series hermetic centrifugal chillers.
Optional Variable VI (Volumetric
Index) offers simple,
automatically controlled, compression ratio control for optimized
dual duty applications such as comfort cooling and thermal storage.
Low leak, positive pressure design minimizes environmental impact and saves money:
Positive pressure design
uses refrigerant HCFC-22 or HFC-134a.
ASME (American Society
of Mechanical Engineers) construction
requires rigorous pressure testing and ensures leak-tight assembly.
O-ring seals
on the hermetic compressor replace leak-prone gaskets.
Straight-thread, O-ring
sealed fittings
replace leaky, tapered pipe thread fittings.
Brazed joints
provide tight seals and flare connections are used for service
joints only.
Use of positive pressure
refrigerants result
in a smaller footprint, reducing installation costs and providing
more rentable space.
Positive pressure
keeps air and moisture out of the chiller, eliminating the need
for a purge device and the associated loss of refrigerant.
Direct Digital Product
Integrated Control (PIC)
provides unsurpassed flexibility and functionality. The PIC can
be easily integrated directly into the Carrier Comfort Network.
The Product Integrated
Control (PIC) monitors
over 100 functions and conditions. In addition, it displays over
125 operating states and diagnostic messages for improved operator
control.
A Proportional/Integral/Derivative
(PID) control algorithm
provides tight chilled water control without hunting.
Automatic two chiller lead/lag
capability provides
integral standby controls.
A 16 line by 40 character
LCD display offers
''all in one glance'' access to key chiller operating information.
Local Interface Device
(LID) provides
unparalled ease of user inter-face. The LCD display features 4
menu specific soft keys and a simple, intuitive design.
Modular pull-out/plug-in
design requires
minimal wiring and simplifies installation.
Low voltage design
is safe and reliable.
Battery backup
provides protection during power failures and eliminates time
consuming control reconfiguration.
The extensive service menu
can be password protected to prevent unauthorized access. Diagnostic
capabilities assist technicians in troubleshooting and recommend
proper corrective action for pre-set alarms, resulting in greater
machine uptime.
An automatic capacity override
feature prevents nuisance shutdowns by unloading the compressor
when-ever key safety limits are approached.
Encapsulated circuit boards,
designed and built by Carrier, offer superior reliability compared
to open board designs. Stringent quality standards are enforced
and ensured through in-house construction.
Optional control modules
offer unique control expandability that includes chilled water
reset, demand limit from remote sources, and much, much more.
Extensive factory testing:
Components are tested individually
and after assembly
to ensure quality and outstanding performance.
ASME Inspections of all
pressure vessels
occur at major points of assembly. ASME rated materials and processes
result in the ''U'' stamp, a sign of pressure vessel integrity.
Compressors are 100% run
tested before mounting
as an additional step in the quality process to ensure proper
functioning.
Hydrostatic vacuum and
pressure testing
of assembled chillers ensures leak integrity.
The controls and optional
unit-mounted starter
are tested after mounting to verify proper electrical functioning.
An optional certified or
witnessed ARI 550 performance test
is available.
Storage tank and pumpout system:
Carrier's policy is to protect the environment by ensuring the containment of refrigerant during both operation and service. To help meet this requirement, the 23XL chiller can be teamed with an optional partner: The 19XB Positive Pressure Storage System.