Product data

Variable refrigerant metering
eliminates inefficient vapor bypass and
provides superior part-load perfor-
mance 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 con-
nections. 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 addi-
tional machine room cooling require-
ments and reduces installation costs.
Single point electrical connection,
provided with the optional unit-
mounted starter, eliminates start-up
problems caused by miswiring and fur-
ther reduces installation costs.
Quiet operation reduces the need
for costly sound insulation in acousti-
cally 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 per-
sonnel to store the refrigerant charge
in the cooler or condenser during
servicing.
The hermetic twin screw com-
pressor is designed specifi-
cally for air-conditioning and
light-brine duty.
Proprietary manufacturing tech-
niques yield rotor clearances mea-
sured 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 conser-
vatively loaded bearing system in the
industry.
Bottom-mounted capacity control
slide valve offers inherently accu-
rate 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 ther-
mal storage.
Low leak, positive pressure
design minimizes environmen-
tal impact and saves money.
Positive pressure design uses
refrigerant HCFC-22 or HFC-134a.
ASME (American Society of Me-
chanical Engineers) construc-
tion requires rigorous pressure testing
and ensures leak-tight assembly.
O-ring seals on the hermetic com-
pressor replace leak-prone gaskets.
Straight-thread, O-ring sealed fit-
tings replace leaky, tapered pipe
thread fittings.
Brazed joints provide tight seals,
and flare connections are used for ser-
vice joints only.
Use of positive pressure refriger-
ants result in a smaller footprint,
reducing installation costs and provid-
ing 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 diag-
nostic messages for improved operator
control.
A Proportional/Integral/Derivative
(PID) control algorithm provides
tight chilled water control without
hunting.
Table of contents
Page
Features/Benefits .................................................1-9
Model Number Nomenclature ........................................4
Options and Accessories ............................................10
Machine Components ............................................11,12
Physical Data ...................................................13-15
Dimensions .....................................................16,17
Electrical Data ....................................................18
Performance Data .................................................19
Application Data ................................................19-27
Controls ........................................................28-33
Typical Piping and Wiring ........................................34,35
Typical Field Wiring ..............................................36-39
Guide Specifications .............................................40-46
2