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.