Chiller - Carrier

30XA

Air-Cooled Screw Chiller

Catalogue Number CHK-C-30XA-0802-01

Manufacturer reserves the right to change any product specifications without notice

Nominal Capacity Range : 274~1523kW

CONTENT

Introduction

Features & Benefits

Options & Accessories

Operating Limits

Performance Data

Physical Data

Electrical Data

Dimensions/ Clearances

Guide Specifications

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2

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23

The Aquaforce liquid chillers are the premium solution for

industrial and commercial applications where installers,

consultants and building owners require optimal performances

and maximum quality.

The Aquaforce liquid chillers are designed to meet current and

future requirements in terms of energy efficiency and operating

sound levels. They use the best technologies available today:

■ Twin-rotor screw compressors with a variable capacity valve

■ Aluminium micro-channel heat exchangers (MCHX)

■ Low-noise generation IV Flying Bird fans made of composite

material

■ Touch-screen Pro-Dialog control system

■ Pure R134a refrigerant.

To respond to all environmental and economic constraints,

Carrier has developed the Aquaforce in two versions:

■ LOW NOISE VERSION – Offers an extremely low noise

level while at the same time boasting superior energy

efficiency

■ STANDARD HIGH EFFICIENCY VERSION – Offers

unequalled energy efficiency to satisfy the most stringent

demands of building owners wanting to reduce operating

costs to the minimum

The Aquaforce range is available in 17 models from 270 to

1500 kW and offers the best solution for any individual projects

and site requirements.

®

1

Aluminium Micro-channel heat exchanger -MCHX

Environmentally Sound Operation

MCHX ensures improved refrigerant circulation by its microchannel technology, w h i c h a l l o w s a 3 0 % reduction in the refrigerant cha rge fo r t he ch i l l e r. Moreover, Aquaforce utilizes the refrigerant of R134a, an HFC refrigerant with zero ozone depletion potential, which can help reducing the potential of global warming.

A True Innovation

Already utilized in the automobile and aeronautical industries for many years, the Microchannel Heat Exchanger (MCHX) is now available on the Aquaforce chiller series. With the optimized fin design that enhances surface area contact, MCHX possesses excellent heat transfer characteristics on both refrigerant and a i r s ide . The f in - to -tube metallurgical bond also reduces thermal resistance and results in better heat conduction. These innovative features bring the heat exchanger with 10% more efficient than a traditional copper/aluminium coil.

Aluminium : High Durability

Unlike conventional coils, the Microchannel Heat Exchanger is made entirely of aluminium: this one-metal concept eliminates galvanic currents that are generated when different metals touch in conventional coils. Many comparative tests, including the salt mist and ammonium sulphate test, provide proof of the increased corrosion resistance of the MCHX. The conclusion is that the MCHX heat exchanger offers 3.5 times higher corrosion resistance than conventional copper/aluminium coil.

2

Increase Energy Savings

There is an example of the energy consumption in an office building with 850 kW heat load. The study compares the energy consumption of products in energy class A, B and C*, as well as the CO2 emissions over 15 years.

Reduce Emissions Into The Atmosphere

The CO2 reduction in kWh and kg for a 30XA 902 unit, compared to a class B machine is 28%, and 36% for a class C machine.

Increase Energy Savings

ThTheheheerererere is isii an example of the energy consumption in an officebuilding g with 8h 8h 8850505050 kW kkk heat load. The study compares the energyconsumsumsumptipp on of products ininin eneeneenergygg class A, B and C*, as well asthethth CO2 emisisi siosiosions nn over 15 years.

Reduce Emissions Into TheAtmosphere

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3

A Compelling Factor: An Average COP of 3.2

(* Eurovent energy efficiency classification)

Compressor

10oC 15oC

Condenser

Evaporator

Pump

Achieve High Energy Effi ciency

With an average full load COP of 3.20 kW/kW, the Aquaforce reaches new heights in energy efficiency – the IPLV (Integrated Part Load Value) of 4.20 kW/kW in average. Full load operation is only required 1% of the machine operating time.

The Aquaforce economizer with its electronic expansion device permits a considerable increase in cooling capacity and contributes to optimised energy efficiency of the chiller installation.

True Ecological & Economic Progress

For buildings that require year-round cooling, even in the coldest regions, Carrier has developed the DX Free Cooling system that offers significant energy savings.

When the outside temperature falls below a threshold value the DX Free Cooling system offers savings. The system utilizes the principle of natural migration of a gas from the evaporator to the condenser. A cooling-mode micro-pump ensures the continuity of the cycle and allows the compressors to switch off. Only the fans and the micro-pump operate. This innovative principle offers increased energy efficiency and significant energy savings (EER ~15 to 30).

Inherent Sound Absorption

The Aquaforce screw compressor includes a discharge damper located inside the oil separator to absorb refrigerant pulsations. It is also equipped with flexible connections on the suction piping to prevent noise transmission. The compressors are enclosed by noise absorbing casings to limit sound transmission and contribute to the exceptionally low Aquaforce sound levels.

Everything Optimised For Low Noise Levels

To ach ieve such low values, Carrier has reduced the noise levels of all Aquaforce elements: f an , compresso r a n d c o n d e n s e r. A q u a f o r c e i s equipped with the 4th generation Flying Bird fan, made of composite materials. I ts sophist icated, aerodynamic shroud

displaces the air without turbulence and generates a sound spectrum without irritating low-frequency peaks. In addition, the V-shape arranged condenser coils bear with an open angle, which allows quieter airflow across the coil. The rigid fan mounting also prevents any start-up noise.g also prevents any start-up noise.

The Low-Noise Factor 94 dB(A)* * Sound power level of 1000 kW low-noise unit

4

Guaranteed Feasibility

The industrial-type screw compressors of Aquaforce, which are mounted on the slide rails, are constructed with oversized bearings and motor cooled by suction gas. With the ease of accessing the compressor components, it is convenient to conduct on-site intervention, thus significantly minimizing the machine downtime. Electronic board further increases the protection of screw compressor.

Structural Robustness & ServiceabilityEquipped with rigid surface, the all-aluminium Microchannel coil eliminates potential of fin damage during manufacturing, shipping or after unit installation. The structural toughness of the outer coil surface also facilitates cleaning by high-pressure washing (as large as 69 bar), thus leads to the longer coil life.

Ease-of-use Interface

The Aquaforce operator interface is very user-friendly. With a large touch screen (120 x 99 mm) the Pro-Dialog operator interface gives easy access to the operating parameters. The information is in clear text and can be displayed in the language of your choice. Up to eight screens can be personalized.

Installation Time with the All-in-one Concept*With the integrated hydronic module the Aquaforce is installed easily and quickly. No time is lost to select the various components and order parts, and no complicated installation: the complete system is pre-tested at the factory and immediately operational. Gaining time and money!

Carrier’s StrengthIt is always our strength to introduce a product not only with high reliability and durability, but also with the ample flexibility and ease-of-use philosophy that can help facilitating installation, operation and maintenance.

(*Optional, models from 274 kW to 508 kW)

Absolute Reliability and User-friendly

®

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6

Operating limits Evaporator water temperature

Minimum Maximum

Water entering temperature at start-up °C – 45 Water entering temperature during operation °C 6.8 21 Water leaving temperature during operation °C 3.3 15

Note: If the leaving water temperature is below 4°C, the glycol-water solution or the frost protection option must be used

Condenser air temperature

Minimum Maximum

Storage °C -20 68 Operation °C -10 55

Note: If the air temperature is below 0°C, the glycol-water solution or the frost protection option must be used

Options and accessoriesOptions Description Model size

Unit without enclosure Compressors not equipped with acoustic enclosure 30XA 252-1502

High-pressure single-pump hydronic module Integrated hydronic module system with water pump, 30XA 252-502 water filter, membrane extention tank, thermal insulation, pressure gauge and water flow control valve

CCN to J-Bus/ BacNet/ LON gateway Two-directional communications board, complies 30XA 252-1502 with J-Bus/ BacNet/ LON protocol

Reversed water connections Evaporator with reversed water inlet/ oulet 30XA 602-1502

1600 kPa waterside pressure Evaporator with waterside working pressure of 1600 kPa 30XA 252-1502

100% heat recovery Equipped with water-cooled condenser(s), allows total heat 30XA 252-1002 recovery – free generation of hot water up to 60˚C

Low-noise version Condenser fan with performance of lower air volume flow 30XA 252-1502

Traditional coils (Cu/AI) Coils made of copper tubes with aluminium fins 30XA 252-1502

Corrosion protection (Blygold), Field application of Blygold Polual treatment on the 30XA 252-1502traditional coils copper/aluminium coils

Corrosion protection (Pre-coated AI), Factory application of pre-coating treatment on the 30XA 252-1502traditional coils aluminium fins

Evaporator water flow rate, l/s

30XA Minimum Maximum*

252 3.6 37.5 302 4 40.5 352 4.3 40.5 402 5.3 34.1 452 6 36.9 502 6.7 42 602 8.1 45 702 8.9 56.1 752 9.6 59.1 852 11 67.1 902 11.8 73.9 1002 13.1 83.9 1102 15.1 87.8 1202 16.4 92.9 1302 17.5 96.1 1352 18.8 107.4 1502 19.9 109.4

* Maximum water flow rate corresponds to 100 kPa pressure drop

®

7

Performance data

High-efficiency version (standard)

30XA 252 302 352 402 452 502 602 702 752 Cooling Capacity* kW 274 300 326 393 451 508 616 677 726 Total Unit Power kW 87.5 96.2 104.8 121.0 140.5 154.4 191.4 203.3 233.4

C.O.P.* kW/kW 3.13 3.12 3.11 3.25 3.21 3.29 3.22 3.33 3.11 IPLV** kW/kW 4.31 4.48 4.58 4.40 4.67 4.69 4.48 4.64 4.41 Sound Pressure Level*** dB(A) 62 62 62 62 62 62 63 64 65

Fans Standard total air flow l/s 27083 27083 27083 36111 36111 40625 49653 54167 54167

Evaporator Nominal Water Flow Rate* l/s 13.06 14.30 15.54 18.74 21.50 24.22 29.37 32.28 34.61 Nominal Pressure Drop* kPa 13.8 14.1 16.4 32.7 35.4 34.7 43.2 35.0 35.8

30XA 852 902 1002 1102 1202 1302 1352 1502 Cooling Capacity* kW 838 899 1000 1147 1246 1353 1442 1523 Total Unit Power kW 256.8 286.3 310.3 348.4 387.9 425.4 463.2 470.1

C.O.P.* kW/kW 3.26 3.14 3.22 3.29 3.21 3.18 3.11 3.24 IPLV** kW/kW 4.55 4.32 4.40 4.66 4.54 4.66 4.62 4.53 Sound Pressure Level*** dB(A) 65 66 65 66 67 66 67 67

Fans Standard total air flow l/s 63194 63194 72222 85764 90278 90278 90278 108333

Evaporator Nominal Water Flow Rate* l/s 39.94 42.86 47.66 54.67 59.42 64.52 68.74 72.62 Nominal Pressure Drop* kPa 37.5 35.1 35.0 40.1 41.7 45.5 42.1 45.2

Low-noise version (option)

30XA 252 302 352 402 452 502 602 702 752 Cooling Capacity* kW 268 293 320 382 437.7 492 605 653 706 Total Unit Power kW 86.7 98.0 105.7 123.2 142.0 158.1 198.1 208.4 235.1

C.O.P.* kW/kW 3.09 2.99 3.02 3.10 3.08 3.11 3.05 3.13 3.00 IPLV** kW/kW 4.53 4.63 4.81 4.73 5.01 5.02 4.61 4.67 4.69

Sound Pressure Level*** dB(A) 58 58 58 58 60 60 60 60 63 Fans Standard total air flow l/s 20500 20500 20500 27333 27333 30750 37583 41000 41000

Evaporator Nominal Water Flow Rate* l/s 12.76 13.98 15.24 18.22 20.87 23.44 28.83 31.12 33.67 Nominal Pressure Drop* kPa 13.2 13.5 15.9 31.1 33.5 32.7 41.8 32.8 34.0

30XA 852 902 1002 1102 1202 1302 1352 1502 Cooling Capacity* kW 802 869 952 1116 1216 1296 1382 1478 Total Unit Power kW 265.2 296.7 320.7 362.4 404.9 445.2 504.2 493.0

C.O.P.* kW/kW 3.02 2.93 2.97 3.08 3.00 2.91 2.74 3.00 IPLV** kW/kW 4.70 4.35 4.39 4.71 4.58 4.57 4.42 4.58

Sound Pressure Level*** dB(A) 62 63 63 63 63 63 64 64 Fans Standard total air flow l/s 47833 47833 54667 64917 68333 68333 68333 82000

Evaporator Nominal Water Flow Rate* l/s 38.23 41.42 45.36 53.19 57.98 61.81 65.87 70.47 Nominal Pressure Drop* kPa 34.6 32.9 32.0 38.1 39.8 42.0 38.9 42.8 Note: For the performance data of Traditional coils (Cu/AI) version, please contact our Sales Engineer for more details.* Nominal conditions: Evaporator entering/leaving water temperature = 12°C/7°C Outdoor air temperature = 35°C Evaporator fouling factor = 0.018m2K/kW ** Integrated Part Load Value (in accordance with ARI 550/590-98)*** Average Sound pressure levels at 10m distance in a free field

8

Physical data

30XA 252 302 352 402 452 502 602 702 752 Length Standard unit mm 3604 3604 3604 4798 4798 5992 7186 7186 7186 Cu/AI coils (option) mm 3604 3604 4798 4798 4798 5992 7186 7186 8380 Width mm 2253 2253 2253 2253 2253 2253 2253 2253 2253 Height mm 2297 2297 2297 2297 2297 2297 2297 2297 2297 Operating Weight* Standard unit kg 3840 3880 3920 4780 4850 5330 6260 6410 6710 Cu/AI coils (option) kg 4160 4190 4710 5190 5260 5830 6870 7030 7820 Refrigerant R-134a Standard unit Circuit A kg 36 37 37 53 55 62 62 62 70 Circuit B kg 38 38 39 37 39 39 62 66 62 Circuit C kg - - - - - - - - - Cu/AI coils (option) Circuit A kg 60 64 70 85 85 102 102 100 129 Circuit B kg 64 64 56 56 56 56 88 95 88 Circuit C kg - - - - - - - - -

Compressors 06T semi-hermetic screw compressors, 50 r/s No. of Circuit A 1 1 1 1 1 1 1 1 1 No. of Circuit B 1 1 1 1 1 1 1 1 1 No. of Circuit C - - - - - - - - - Minimum capacity % 15 15 15 15 15 15 15 15 15 Control PRO-DIALOG, electronic expansion valve (EXV) Condensers Aluminium micro-channel heat exchanger Fans FLYING BIRD IV Quantity Standard unit 6 6 6 8 8 9 11 12 12 Cu/AI coils (option) 6 6 7 8 8 9 11 12 13 Evaporator Flooded shell with copper tube Water content l 58 61 61 66 70 77 79 94 98 Maximum Operating Pressure kPa 1000 1000 1000 1000 1000 1000 1000 1000 1000 Water connections Victaulic Diameter, inlet/outlet in 5 5 5 5 5 5 5 6 6 Outside diameter, inlet/outlet mm 141.3 141.3 141.3 141.3 141.3 141.3 141.3 168.3 168.3

30XA 852 902 1002 1102 1202 1302 1352 1502 Length Standard unit mm 8380 8380 9574 11962 11962 11962 11962 14872 Cu/AI coils (option) mm 8380 9574 9574 11962 11962 11962 11962 14872 Width mm 2253 2253 2253 2253 2253 2253 2253 2253 Height mm 2297 2297 2297 2297 2297 2297 2297 2297 Operating Weight* Standard unit kg 7560 7860 8440 10440 10880 11260 11620 12780 Cu/AI coils (option) kg 8260 9010 9260 11470 11890 12250 12640 13990 Refrigerant R-134a Standard unit Circuit A kg 77 70 80 69 85 87 87 92 Circuit B kg 66 75 84 66 66 68 80 95 Circuit C kg - - - 100 100 100 96 100 Cu/Al coils (option) Circuit A kg 130 129 140 102 112 112 112 140 Circuit B kg 95 103 129 92 92 92 98 129 Circuit C kg - - - 130 120 120 117 130

Compressors 06T semi-hermetic screw compressors, 50 r/s No. of Circuit A 1 1 1 1 1 1 1 1 No. of Circuit B 1 1 1 1 1 1 1 1 No. of Circuit C - - - 1 1 1 1 1 Minimum capacity % 15 15 15 10 10 10 10 10 Control PRO-DIALOG, electronic expansion valve (EXV) Condensers Aluminium micro-channel heat exchanger Fans FLYING BIRD IV Quantity Standard unit 14 14 16 19 20 20 20 24 Cu/AI coils (option) 14 15 16 19 20 20 20 24 Evaporator Flooded shell with copper tube Water content l 119 130 140 168 182 203 224 240 Maximum Operating Pressurek Pa 1000 1000 1000 1000 1000 1000 1000 1000 Water connections Victaulic Diameter, inlet/outlet in 6 6 8 6 6 6 8/ 8/ 6 6 Outside diameter, inlet/outlet mm 168.3 168.3 219.1 168.3 168.3 168.3 219.1/ 219.1/ 168.3 168.3

* Weights are guidelines only** Unit size 30XA 1502 is supplied in 2 field-assembled modules

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9

Physical data, water-cooled condenser for 100% heat recovery option

30XA 252 302 352 402 452 502 602 702 752

Operating Weight* kg 4230 4270 4280 5260 5380 5880 7000 7100 7470

Condenser(s) Tubular condenser with copper tube Quantity 1 1 1 1 1 1 2 2 2 Water connections Victaulic Diameter, inlet/outlet in 3 1/2 3 1/2 3 1/2 4 4 4 4/ 4/ 4/ 4 4 4

30XA 852 902 1002

Operating Weight* kg 8320 8670 9280

Condenser(s) Tubular condenser with copper tube Quantity 2 2 2 Water connections Victaulic Diameter, inlet/outlet in 4/ 4/ 4/ 4 4 4

(Please contact our Sales Engineer for more details)* Weights are guidelines only** Unit size 30XA 1502 is supplied in 2 field-assembled modules

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Electrical Data

30XA 252 302 352 402 452 502 602 702 752

Power circuit Nominal power supply V-ph-Hz 400-3-50 Voltage range V 360-440

Maximum supply cable section Circuit A+B mm2 2 x 240 2 x 240 2 x 240 2 x 240 2 x 240 2 x 240 4 x 240 4 x 240 4 x 240 Circuit C+D mm2 - - - - - - - - -

Short circuit holding current Circuit A+B kA rms 38 38 38 38 38 38 50 50 50 Circuit C+D kA rms - - - - - - - - -

30XA 852 902 1002 1102 1202 1302 1352 1502

Power circuit Nominal power supply V-ph-Hz 400-3-50 Voltage range V 360-440

Maximum supply cable section Circuit A+B mm2 4 x 240 6 x 240 6 x 240 4 x 240 4 x 240 4 x 240 6 x 240 6 x 240 Circuit C+D mm2 - - - 2 x 240 2 x 240 2 x 240 2 x 240 2 x 240

Short circuit holding current Circuit A+B kA rms 50 50 50 50 50 50 50 50 Circuit C+D kA rms - - - 50 50 50 50 50

High-efficiency version (standard)

30XA 252 302 352 402 452 502 602 702 752

Control Circuit 24V via internal transformer Maximum start-up current* # Circuit A+B A 267 267 289 400 507 507 579 608 778 Circuit C+D A - - - - - - - - - Nominal Unit Current Drawn** Circuit A+B A 149 165 182 210 239 262 320 343 404 Circuit C+D A - - - - - - - - - Maximum Unit Current Drawn* Circuit A+B A 216 240 264 304 345 376 457 488 552 Circuit C+D A - - - - - - - - -

30XA 852 902 1002 1102 1202 1302 1352 1502

Control Circuit 24V via internal transformer Maximum start-up current* # Circuit A+B A 807 892 945 579 778 803 889 945 Circuit C+D A - - - 587 587 587 587 587 Nominal Unit Current Drawn** Circuit A+B A 446 511 549 320 404 439 523 549 Circuit C+D A - - - 275 275 275 271 275 Maximum Unit Current Drawn* Circuit A+B A 642 678 796 457 552 634 729 796 Circuit C+D A - - - 398 398 398 394 398

Low-noise version (option)

30XA 252 302 352 402 452 502 602 702 752

Control Circuit 24V via internal transformer Maximum start-up current* # Circuit A+B A 262 262 284 395 502 502 571 597 770 Circuit C+D A - - - - - - - - - Nominal Unit Current Drawn** Circuit A+B A 150 167 185 212 244 267 325 349 409 Circuit C+D A - - - - - - - - - Maximum Unit Current Drawn* Circuit A+B A 205 229 253 289 329 359 436 465 529 Circuit C+D A - - - - - - - - -

30XA 852 902 1002 1102 1202 1302 1352 1502

Control Circuit 24V via internal transformer Maximum start-up current* # Circuit A+B A 796 880 932 571 770 795 878 932 Circuit C+D A - - - 587 587 587 587 587 Nominal Unit Current Drawn** Circuit A+B A 457 516 565 325 409 453 537 565 Circuit C+D A - - - 282 282 282 281 282 Maximum Unit Current Drawn* Circuit A+B A 616 652 766 436 529 611 704 766 Circuit C+D A - - - 383 383 383 381 383

Note: Unit sizes 30XA 1102 to 1502 have two power connection points (Circuits A+B and Circuits C+D)* At maximum operating conditions** Nominal condition based on Standard Unit under Eurovent condition# Maximum operating current of the smallest compressor + fan current + locked rotor current or reduced starting current of the largest compressor

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11

Dimensions/clearances

30XA 252-302-35230XA 252-302 - Cu/Al heat exchanger (option)

30XA 402-45230XA 352-402-452 - Cu/Al heat exchanger (option)

Legend:

All dimensions are given in mm

Required clearances for maintenance and air

flow

Recommended space for evaporator

tube removal

Water inlet

Water outlet

Power supply connection

Control circuit connection

NOTE:

Drawings are not contractually binding. Before designing an installation, consult the certified

dimensional drawings, available on request

12


30XA 502

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30XA 602-702-75230XA 602-702 - Cu/Al heat exchanger (option)

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30XA 852-90230XA 752-852 - Cu/Al heat exchanger (option)

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30XA 100230XA 902-1002 - Cu/Al heat exchanger (option)

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30XA 1102-1202-1302-1352

Legend:



flow

Recommended space for evaporator tube

removal

Water inlet

Water outlet



NOTE:

Drawings are not contractually binding. Before designing an installation, consult the certified dimensional

drawings, available on request

30XA 1102 30XA 1202 30XA 1302 30XA 1352A 439 439 439 439B 493 493 467 442C 1685 1685 1675 1670

ØG 168.3 168.3 168.3 219.1

®

17


30XA 1502

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30XA 1502

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19


30XA 252-302-352 - 100% heat recovery (option)

30XA 402-452 - 100% heat recovery (option)

NOTE:



Legend:



flow


removal

Water inlet

Water outlet



20


30XA 502 - 100% heat recovery (option)

30XA 602-702-752 - 100% heat recovery (option)

NOTE:



Legend:


Required clearances for maintenance and

air flow


removal

Water inlet

Water outlet



30XA 602 30XA 702 30XA 752A 356 372 372B 272 242 242C 438 438 438D 2852 2852 2852

ØE 141.3 168.3 168.3ØF 141.3 168.3 168.3

®

21


30XA 852-902 - 100% heat recovery (option)

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22


30XA 1002 - 100% heat recovery (option)

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st

General descriptionFactory assembled single piece air-cooled liquid chiller. Contained within the unit shall be all factory wiring, piping, controls, refrigerant charge (HFC-134a), multiple refrigeration circuits set, screw compressors, electronic expansion valves and equipment required prior to field start-up. Unit shall be run tested at the factory.

Product featuresUnit frame:Frame shall be made of U steel beam and protected by two layers of protection (primer and final coating) with an average thickness of 200 microns. The control box plates shall be steel with a oven-baked polyester-paint finish, and be capable of withstanding a 500-hour salt spray test in accordance with the ASTM B-117 standard (U.S.A.).

Fans:Condenser fans shall be direct-driven, 11-blade, shrouded-axial type, shall be statically and dynamically balanced, and made of recyclable material with inherent corrosion resistance. Air shall be discharged vertically upward. Fans shall be protected by coated steel wire safety guards.

Compressors:Unit shall have semi-hermetic twin-screw compressors with internal relief valve and check valve to avoid reverse rotation on shut down. Capacity control shall be provided by a variable control slide valve capable of reducing compressor capacity down to 30% of full load. Compressor shall start in unloaded condition.

Motor shall be cooled by suction gas and protected by internal winding temperature sensors. Lube oil system shall include external filter capable of filtration to 5 microns.

The oil separator, separated from the compressor, shall not require oil pump and shall integrate an internal muffler to reduce discharge gas pulsations.

Each compressor and oil separator shall be installed within an insulated acoustic enclosure with removable panels to facilitate service access.

Evaporator:Evaporator shall be tested for a refrigerant-side operating pressure of 2100 kPa and for a maximum water-side pressure of 1000 kPa.

The evaporator shall be mechanically cleanable, shell-and-tube type with removable heads. Tubes shall be internally and externally grooved, seamless-copper, and shall be rolled into tube sheets. Shell shall be insulated with 19 mm closed-cell foam with a maximum K factor of 0.28. Evaporator thermal insulation shall be factory fitted with aluminium cladding to provide mechanical protection and ensure protection against UV rays.

The evaporator shall have a drain and vent in each head.The evaporator shall incorporate an active refrigerant level control system to ensure optimum heat transfer performance under all load conditions.

Chiller shall have only one water inlet & outlet connection with victaulic couplings to avoid vibrations transmission and accept small misalignment.

Evaporator shall be fitted with electronic auto setting water flow switch. Paddle switches or differential pressure switches shall not be acceptable.

Condenser:Shall be made of multiple coils in V configuration to offer self protection against hail. Coil will have integral subcooler, and shall be constructed from a single material throughout to eliminate the risk of galvanic corrosion. Condenser coils material shall be suitable for urban or light marine environments and shall be capable of being cleaned with a high-pressure jet washer (up to 69 bar).

Condenser coils shall be leak tested with helium and shall be pressure tested at 3400 kPa.

Condenser-fan motors shall be 3-phase type with permanently lubricated bearings and Class F insulation.

Guide Specifications – 30XA Series

®

23

Refrigeration circuits:Refrigerant circuit components shall include, compressor, oil separator, high and low side pressure relief devices, refrigerant economizer, filter driers, moisture indicating sight glasses, long stroke electronic expansion device, and complete operating charge of both refrigerant HFC-134a and compressor oil. To facilitate service and maintenance and avoid refrigerant charge transfers, it must be possible to isolate the following components and systems independently: filter driers, oil filters and expansion devices.

Controls:Unit controls shall include as a minimum: microprocessor with non-volatile memory, picture guided unit/operator interface, the LOCAL/OFF/REMOTE/CCN selector and a touch-screen display with with multiple language capability.

Pressure sensors shall be installed to measure suction, discharge, and oil pressure. Thermistors shall be installed to measure cooler entering and leaving temperatures and outside air temperature.

Unit shall be capable of performing the following functions:Automatic change-over and cycling of compressors to equalize running hours and number of starts.

EXV control, based on throttling optimizes evaporator charging, ensuring condenser superheat and subcooling. Capacity control based on leaving chilled fluid temperature with return fluid temperature sensing.

Limit the chilled fluid temperature pull-down rate at start-up to an adjustable range of 0.1°C to 1.1°C per minute to prevent excessive demand spikes at start-up. Enable reset of leaving chilled water temperature according to the return water temperature.

Provide a dual set point for the leaving chil led water temperature activated by a remote contact closure signal or by the built in time clock.

Enable a 2-level demand limit control (between 0 and 100%) or a maximum current drawn limit activated by a remote contact closure or by the built in time clock.

Control evaporator water pump and, if installed, stand-by pump operation. Allow two time scheduling programs to enable unit start-up control, demand limit and set-point changes. Enable lead lag control of two chillers running in series or parallel.

Diagnostics:Display module shall be capable of displaying set points, system status including temperatures, pressures, current for each compressor, run time and percent loading.

The control system shall allow a quick test of all machine elements to verify the correct operation of every switch, circuit breaker, contactor etc. before the chiller is started.

Safeties:Unit shall be equipped with all necessary components, and in conjunction with the control system shall provide the unit with protection against the following:

– Loss of refrigerant charge.– Reverse rotation.– Low chilled water temperature.– Low oil pressure (per compressor).– Current imbalance.– Compressor thermal overload– Automatic compressor unloading in case of excessive air

temperature– High pressure.– Electrical overload.– Loss of phase.

Fan motors shall be individually protected by a circuit breaker. Control shall provide separate general alert (minor incident) and alarm (circuit down) remote indication.

Operating characteristics:Unit shall be capable of starting and running at full or part load at outdoor ambient temperatures from –10˚C to 55˚C.

Unit shall be capable of starting up with 45˚C entering fluid temperature to the evaporator.

Electrical characteristics:Unit shall operate on 3-phase power supply without neutral.

Control voltage shall be supplied by a factory-installed transformer.

Unit shall be supplied with factory-installed electrical disconnect/isolator switch integrating main fuses. Unit shall have a factory installed star/delta starter as standard to limit electrical inrush current.

24

30XA

Air-Cooled Screw Chiller

Catalogue Number CHK-C-30XA-0802-01

Manufacturer reserves the right to change any product specifications without notice

Nominal Capacity Range : 274~1523kW

Chiller - Carrier

Documents

increased energy efficiency

optimised energy efficiency

energy consumption

energy g h

terms of energy efficiency

unequalled energy efficiency

energy savingsthe

refrigerant c h