The first screw chiller with all the advantages of
a quality centrifugal - and more.
High-end centrifugal chillers have a reputation for
reliability, quiet operation, efficiency, and field-serviceability.
Fortunately, now there's a screw chiller with
the same ideal balance of qualities: the 23XL Screw Chiller from
carrier. A chiller that's also environmentally responsible and
easy to install, with low life-cycle costs that make it your best
value for medium-sized commercial applications.
Outstanding Energy Efficiency
The 23XL is engineered to exceptional full- and part-load
efficiencies. Precise compressor tolerances in a design optimized
for air conditioning duty lead to superior compression efficiency.
And advanced, internally and externally enhanced heat transfer
surfaces provide outstanding thermal performance.
A patented variable flow metering device eliminates
inefficient vapor bypass and delivers precisely the right amount
of refrigerant under all conditions. The result is superior part-load
efficiency.
In addition, the integral FLASC (FLAsh SubCooler)
increases the refrigeration effect and reduces compressor power
consumption for a further reduction in operating costs.
Reliable, Long-Life Hermetic Motor
The 23XL uses the same simple motor cooling system
proven effective for over 25 years in the Carrier 19D Series Hermetic
Centrifugal Chiller.
The result is a cool-running hermetic motor which
provides long life, while eliminating the shaft-seal leakage and
machine room cooling requirements of open motors.
Quiet Operation For Application Flexibility
Some screw chillers have
earned a reputation for being loud. But not the 23XL. It's inherently
quiet design makes it ideal for acoustically demanding applications
such as libraries, schools, and hospitals.
Built to Endure
The 23XL screw compressor utilizes AFBMA Class 5
bearings (the same kind typically found in jet engines) which
provide precise rotor positioning. Carrier's unique design provides
the most conservatively loaded bearing system in the industry.
And a hydraulically activated capacity-control slide valve is
located below the screw rotors to prevent the wear potential
associated with top-mounted designs.
A host of other design features add up to make the
23XL a true "centrifugal-class" screw chiller. For
example, double-grooved tube-sheet holes enhance joint structural
integrity. A float-type oil sensor is used instead of lower-cost,
less-reliable flow switches. O-ring seals on the hermetic compressor
replace leak-prone gaskets. And straight-thread O-ring sealed
fittings replace leaky, tapered pipe thread fittings.
Lower Installation Costs
For situations where access is tight, take-apart
bolted construction disassembles and reassembles easily
in the field. Individual components fit through a standard three-foot
doorway. Add the optional unit-mounted starter and you'll eliminate
start-up problems due to mis-wiring.
Other unique design features pay additional dividends
during installation. The positive-pressure design keeps the footprint
small for reduced floor-space requirements. The cool operating
hermetic motor eliminates the hardware and labor costs of installing
additional machine room cooling or ventilation equipment. And
quieter operation reduces the need for expensive soundproofing
- while allowing installation closer to occupied areas, for more
flexible, cost-effective use of building space.
Ecological and Economically Sensible
The 23XL uses a proven, non-CFC refrigerant, HCFC-22
(HFC-134a is also available in selected models). Moreover, the
23XL's hermetic motor design eliminates the shaft-seal leakage
of open-drive units, helping to keep these refrigerants inside
your chiller and out of the environment.
At Last: a Field-Serviceable Screw Compressor
Typically, screw compressors cannot be field-serviced;
they must be sent back to the factory for exchange - a costly
and time-consuming procedure.
The 23XL, however, has a unique fully field-serviceable
compressor, backed by the most comprehensive service organization
in the industry. This can significantly reduce maintenance expense
and downtime.
For routine maintenance, optional refrigerant isolation
valves allow refrigerant storage in the chiller during servicing,
eliminating expensive storage tanks and time-consuming transfer
procedures.
Tested Repeatedly For Quality
Each screw compressor assembly undergoes a rigorous
mechanical run-in test to check proper operation of components,
and to verify that vibration levels and efficiencies meet strict
specifications.
An ASME inspector witnesses a refrigerant-side proof
test at 375 PSIG to verify that all heat exchangers meet ASME
section VIII, Division 1 code for unfired pressure vessels. Then
the entire chiller is leak tested at 300 PSIG with a refrigerant
tracer gas. Next, the water side is hydrostatically tested at
1.5 times the rated working pressure. Meanwhile, vacuum testing
ensures that there are no leaks into the chiller. After
wiring, each chiller is also tested for proper controls operation
prior to final shipment.
In addition, a regular program of audit testing is
conducted in our performance laboratory under design conditions
to verify predicted ratings.
Instant Command Over Powerful Capabilities
Sophisticated Product Integrated Controls (PIC) monitor
over 100 functions, and display over 125 operating and diagnostic
conditions. Yet the system is operator friendly and exceptionally
easy to use. Guesswork is eliminated. Potential problems are quickly
identified. And day-to-day monitoring and operations are greatly
simplified.
If your chiller is connected to Carrier's Comfort
Network (CCN), it's even simpler. All operating parameters for
your entire HVAC system are intelligently monitored and controlled
from one central location.
Perfect For Today And Tomorrow
Consider everything - efficiency, reliability, field-serviceability, ease of installation and operation, energy consumption, and total equipment and material costs - and the 23XL is clearly your best buy now and your best investment in the future. To learn more about it, contact your nearest Carrier Representative. Or call 1-800-CARRIER.