Comfort At Work: Q&A: 19XL hermetic centrifugal chiller


What is the cooling capacity range of the 19XL hermetic centrifugal chiller?

The 19XL is available in cooling capacities ranging from 300 to 600 tons (1055 to 2110 KW) using HCFC-22 refrigerant and 200 t0 550 tons (703 to 1934 KW) using HFC-134a refrigerant.

What is the efficiency range of the 19XL centrifugal chiller What is the efficiency range of the 19XL centrifugal chiller?

At ARI (American Refrigeration Institute) standard conditions the efficiency of the 19XL ranges from .58 to .68 IKW/TON (.165 to .194 kW/kW) at full load. Integrated Part Load Value (IPLV) are equivalent to full load efficiencies.

What are the key features of the 19XL chiller What are the key features of the 19XL chiller?

The positive pressure design of the 19XL results in a significant reduction in product size when compared to a low pressure HCFC-123 chiller of the same capacity and efficiency. The volume can be 25 to 35% smaller than the equivalent HCFC-123 chiller. We also use a bolt together construction that allows each major component (Evaporator, Condenser, Compressor) to be disassembled, rigged into the plant room, and then reassembled which eliminates the need to knock down walls in most applications.

What is the sound level of the 19XL chiller What is the sound level of the 19XL chiller?

Sound levels for the 19XL range in the 87 to 89 dba range without any sound treatment. We offer an optional compressor discharge elbow sound reduction kit that can reduce the sound level by 2 dba. Also available, if required, is a sound blanket kit that covers the compressor, discharge elbow, and condenser. With this treatment sound levels in the 83 dba range are possible.

Will the 19XL work with my existing building energy management system (EMS) Will the 19XL work with my existing building energy management system (EMS)?

Yes, the 19XL will accept start/stop signals, chilled water setpoint reset, and demand limiting from your EMS system. Additional EMS functions can be easily achieved with the addition of an inexpensive optional interface.

What are the advantages of a hermetic compressor vs What are the advantages of a hermetic compressor vs. an open drive compressor?

The hermetic 19XL compressor motor is cooled by the circulating liquid refrigerant. The motor operates in a clean and cool environment as opposed to a typical open drive compressor. The hermetic design eliminates heat rejection to the plant room which is characteristic of an air cooled open drive motor. The energy consumption to cool the motor is included in the 19XL power consumption. The heat rejected by an air cooled open motor must be accounted for in the building cooling or ventilation load. The hermetic compressor also eliminates the open drive shaft seal. Shaft seals wear and leak both oil and refrigerant and have to be replaced as the chiller ages. The 19XL hermetic design eliminates this operating concern.

Does Carrier offer performance testing for the 19XL Does Carrier offer performance testing for the 19XL?

Yes, both customer witnessed and Carrier certified performance testing is available. However you should be aware the 19XL is ARI certified. This certification is maintained through a stringent program of independently witnessed periodic performance testing.

What quality assurance programs do you have in place What quality assurance programs do you have in place?

The 19XL is Underwriters Laboratories (UL) listed (CUL for Canada). Also the refrigerant side of the chiller is designed and built in accordance with ASME requirements, assuring pressure vessel integrity. The 19XL is built in accordance with the latest version of ASHRAE 15 safety code for mechanical refrigeration units. The 19XL is also built in Carrier's ISO 9001 listed manufacturing facility.

What type of control system is used on the 19XL What type of control system is used on the 19XL?

All Carrier centrifugal and rotary screw chillers utilize our microprocessor based Product Integrated Controls (PIC) as standard. This control system monitors over 100 functions and displays over 125 operating and diagnostic conditions. The human interface is a 16 line by 40 character backlit LCD display that allows simultaneous display of key chiller operating parameters on the same screen. The PIC can also be easily connected to the Carrier Comfort Network to interface with the entire building control system.

What important containment features does the 19XL include What important containment features does the 19XL include?

The 19XL includes as standard refrigerant isolation valves in the compressor discharge line, cooler liquid line, and motor cooling line. Once these valves are closed you can easily pumpdown the chiller and store the refrigerant charge in the condenser to service the compressor. This eliminates the need for an external refrigerant storage tank and interconnections with the chiller. We also include as standard reseating pressure relief valves that reduce the risk of loosing the entire refrigerant charge if an overpressurization occurs. These type of relief valves are often installed at the job site in series with low pressure rupture disks that are provided as standard on low pressure HCFC-123 chillers.

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