19XL

Hermetic Centrifugal Liquid Chiller

50/60 Hz

HCFC-22 - 300 to 600 Nominal Tons (1055 to 2110 kW)

HFC-134a - 200 to 530 Nominal Tons (700 to 1865 kW)

The 19XL is one of the most technologically advanced chiller available. Its innovative combination of advancements in compression, heat exchange, and direct digital control technologies result in an efficient, reliable, and flexible design.

Features/Benefits

The positive pressure design:

Reduces the size of the chiller by up to 35% as compared to low-pressure designs, resulting in lower floor space requirements and easier installation.

Allows for easier installation within confined plant rooms when compared to similar chillers of equal capacity. This is due to its modular construction and smaller components.

Eliminates the need for a purge unit, which reduces refrigerant loss and eliminates purge vent and water piping.

Fulfills ASME refrigerant side construction requirements through rigorous pressure testing and a design that ensures a leak tight assembly.

Allows for storage of refrigerant in the chiller during servicing with the addition of liquid line and compressor discharge isolation valves.

Reduced operating costs are achieved through advancements in three key technologies:

Compression:

Tunnel diffuser, originally developed through the use of jet engine technology, is now utilized by Carrier to increase centrifugal compressor peak operating efficiency. Higher efficiencies are possible by reducing friction losses through the diffuser section of the compressor.

New impeller with aerodynamically contoured blade profiles, high back sweep blades, and intermediate splitter blades improves the efficiency of refrigerant compression.

Reduced mechanical losses and increased efficiency are achieved by optimizing the amount of oil required in the gear mesh, reducing friction in the journal bearings, reducing thrust loads, and streamlining the motor rotor to reduce windage losses.

High efficiency hermetic motors cooled by liquid refrigerant reduce the electrical losses of the compressor.

Heat Exchange:

The latest heat transfer technology was used to improve tube surface efficiency, while maintaining a compact design. Water side and refrigerant side tube enhancements reduce the overall resistance to heat transfer, resulting in improved heat transfer efficiency.

Optimizing tube spacing allows peak heat transfer efficiency to be achieved when using the new advanced tube surfaces.

Integral FLASC (Flash Subcooler) cools the condensed liquid refrigerant to a lower temperature; consequently increasing the refrigeration effect and resulting in reduced compressor power consumption.

Variable refrigerant metering ensures a liquid seal at all operating conditions to eliminate performance losses from unintentional hot gas bypass.

Direct Digital Controls:

Precise chilled water temperature control is maintained by the micro-processor controller which accurately positions the compressor inlet guide vanes in response to changes in cooling load.

Occupancy schedules can be programmed into the controller to ensure that the chiller only operates when cooling is required.

Ramp loading ensures a smooth pulldown of water loop temperature while preventing a rapid increase in compressor power consumption during the pulldown period.

Demand limiting is included to limit the power draw of the chillers during peak loading conditions. When incorporated into the Carrier Comfort Network (CCN) building automation system, a red line command will hold all chillers at their present capacity and prevent any other chillers from starting. If a loadshed signal is received, the compressors are unloaded to avoid high demand charges whenever possible.

Chilled water reset can be done manually or automatically from the building management system which saves energy when warmer chilled water can be utilized.

With the addition of the Chillervisor chiller plant management controller, the entire chiller plant, including chillers, pumps, valves and cooling towers, is automatically controlled to reduce the overall plant power consumption. Multiple chillers are sequenced to ensure the lowest possible power consumption during reduced loading conditions.

Increased reliability, resulting in less downtime and longer life, is achieved through the use of:

The hermetic compressor eliminates shaft seals and associated refrigerant and oil leakage, as well as motor heat rejection to the plant room. Both faults are characteristic of open compressor designs.

The single stage design eliminates additional moving parts such as second-stage adjustable guide vanes and multiple FLASCs, which are characteristic of some multistage compressors.

Steel backed, babbitt lined, compressor sleeve bearings and a Kingsbury-type, self-leveling thrust bearing increase reliability.

Cool-running hermetic motors have been proven reliable through more than 25 years of service.

Stationary tunnel diffuser requires no moving or wearing parts, which further enhances reliability.

Microprocessor controls eliminate the need for pressure and temperature switches and pressure gages.

Circuit boards are encased in plastic modules to eliminate damage and abuse.

Microprocessor controls simplify use, improve chiller protection, reduce trouble-shooting time, and provide additional information to the operator. The controls feature a:

16 line by 40 character display which provides ''all in one glance'' access to key chiller operating data and simplifies use by eliminating ''coded'' messages. It displays over 125 operating and diagnostic conditions to reduce troubleshooting time.

Microprocessor monitors over 100 functions to protect the chiller from abnormal conditions.

365-day real time clock allows the operator to program a yearly schedule for the week, weekends, and holidays.

Battery backup provides protection during power failures and eliminates time consuming control reconfiguration.

Alarm file maintains the last 25 time and date stamped alarm and alert messages in memory to reduce troubleshooting time and cost.

Capacity override mode keeps the chiller on line to reduce nuisance shutdowns. This function unloads the compressor whenever key safety limits are approached.

An automated controls test can be executed prior to start-up to verify that the entire control system is functioning properly.

Optional modules offer unique control expandability - chilled water reset and demand limit from remote sources and more.

Additional features simplify installation and reduce installation time and cost:

Refrigerant-cooled oil cooler eliminates auxiliary water piping.

Optional unit-mounted starters provide single point power connection and are fully tested prior to shipment from the factory.

Factory tested before shipment provides peace of mind while protecting your chiller investment:

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 extra quality step.

Hydrostatic, vacuum and pressure testing of the assembled chillers ensures leak integrity.

Controls and optional unit-mounted starter are tested after mounting to verify proper electrical functioning.