carrier chiller catalog

8/11/2019 Carrier Chiller Catalog

http://slidepdf.com/reader/full/carrier-chiller-catalog 1/28Copyright 2011 Carrier Corporation Form 19XRD-3P

Evergreen ® 19XRD centrifugal chilleroffer:• The use of chlorine-free refrigeran

HFC-134a, which is not affected b

scheduled refrigerant phaseouts• Semi-hermetic, refrigerant-cooledmotors

• Positive pressure construction

Features/BenefitsThe Carrier-designed19XRD chillers provide highefficiencies with dualcompressors.

The 19XRD chiller’s efficiencies areobtained at true operating conditions

High efficiencyThe 19XRD chillers leverage Carrier'proven centrifugal technology to pro-vide reliable, efficient operation acrosa wide range of applications. Dualcompressor and independent refrigerant circuits are arranged in an internaseries counterflow pattern to increaseredundancy and full load and part loaefficiency while minimizing footprint.

The combination of the positive pressure design and two compressors running in series allows Carrier's 19XRDchillers to provide high efficiencies under real world operating conditions, icluding part load operation and coldcondenser water temperatures. Lowheat exchanger pressure drops reducpumping energy, saving power and increasing overall plant efficiency.

EVERGREEN ®

19XRDIntegrated Dual Compressor

Hermetic Centrifugal Liquid Chillerswith HFC-134a Refrigerant

50/60 Hz2500 to 3000 Nominal Tons

(8790 to 10548 kW)

ProductData

19XRD

a19-1971

®

evergrn


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2

Low starting currentThe two compressors start up sequen-tially and therefore reduce the inrushcurrent. Compared to a single com-pressor chiller, the 19XRD dual com-pressors reduce 40% of the inrushcurrent.

Environmental leadershipCarrier has long been committed to theenvironment and its sustainability. The19XRD chillers provide our customerswith a high-efficiency, chlorine-freelong-term solution unaffected by refrig-erant phaseouts. Carrier’s decision toutilize non-ozone depleting HFC-134arefrigerant provides our customers witha safe and environmentally sound choicewithout compromising efficiency.

ReliabilityThe 19XRD chiller’s simple, single-

stage positive-pressure compressor,coupled with ASME (American Societyof Mechanical Engineers) constructedheat exchangers, ensures reliability andsustainability. Hermetic motors oper-ate in a clean-liquid, refrigerant-cooledenvironment. The hermetic designeliminates the problem of shaft sealleaks and refrigerant/oil loss.

Positive pressure designThe 19XRD chiller’s positive pressuredesign reduces the chiller size com-pared to low-pressure designs. The

smaller size minimizes the need forvaluable mechanical room floor space.In addition, positive pressure designseliminate the need for costly low-pres-sure containment devices, reducing theinitial cost of the system.

Optional refrigerant isolation valvesThis system allows the refrigerant to bestored inside the chiller duringservicing, reducing refrigerant loss andeliminating time-consuming transferprocedures. The self-contained 19XRD

chiller does not require additionalremote storage systems.

Hermetic compressor featuresSingle-stage design increases prod-uct reliability by eliminating the addi-tional moving parts associated withmultiple stage chillers, such as addi-tional guide vanes and complexeconomizers.

Aerodynamically contoured im-pellers use high back sweep mainblades with low-profile intermediatesplitter blades. The impellers are aero-dynamically contoured to improvecompressor full load and part loadoperating efficiency.

Hermetic motors are hermeticallysealed from the machine room. Cool-ing is accomplished by spraying liquidrefrigerant on the motor windings.This highly efficient motor coolingmethod results in the use of smaller,cooler-running motors than could berealized with air-cooled designs of thesame type.

In addition, the hermetic motor de-sign eliminates:

• Compressor shaft seals that requiremaintenance and increase the likeli-hood of refrigerant leaks

• Shaft alignment problems that occurwith open-drive designs duringstart-up and operation, when equip-ment temperature variations causethermal expansion

• High noise levels that are commonwith air-cooled motors, which radi-ate noise to the machine roomand adjacent areas

• Machine room cooling requirementsassociated with air-cooled motors,which dissipate heat to the machineroom

Compressors are 100% run-test-ed to ensure proper operation of allcompressor systems, including oil man-agement, vibration, electrical, powertransmission, and compression.

Heat exchanger featuresThe 19XRD chiller utilizes ASME(American Society of Mechanical Engi-neers) standards for pressure vessels.This feature requires the use of an in-dependent agency to certify the de-sign, manufacture, and testing of allheat exchangers, ensuring the ulti-mate in heat exchanger safety, reliabili-ty, and long life.

Double-grooved tube sheet holeseliminate the possibility of leaks be-tween the water and refrigerant sys-tem, increasing product reliability.

Condenser baffle prevents direct im-pingement of high velocity compressorgas onto the condenser tubes. The baf-fle eliminates the related vibration andwear of the tubes and distributes therefrigerant flow evenly over the lengthof the vessel for improved efficiency.

Refrigerant filter drier isolation valves allow filter drier replacementwithout the expense of removing ortransferring the refrigerant.

Thermowells and pressure trans-ducers for evaporator and condensertemperature and pressure indicationcan be changed without removing ortransferring the refrigerant charge,providing easier calibration and a re-duction in service time and expense.

FLASC (flash subcooler), located inthe bottom of the condenser, increases

the refrigeration effect by cooling thecondensed liquid refrigerant to a lowertemperature. This results in reducedcompressor power consumption.

Features/Benefits (cont)

able of contentsPage

eatures/Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Chiller Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6,7hysical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8,9Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

imensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10,11election Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12erformance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12lectrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-15ypical Piping and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16pplication Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17-23

Guide Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24-28



3

AccuMeter™ system regulates refrig-erant flow according to load condi-tions, providing a liquid seal at all oper-ating conditions and eliminating unin-tentional hot gas bypass.

Integrated control featuresThe 19XRD integrated controller is an

easy-to-use interface. Each controllerintegrates the operating data of bothcircuits, which makes chiller controland maintenance easier. For identicalcompressor configuration, each circuitcan be designated as the lead circuit tobalance the operating time of the com-pressors. Due to the lead/lag opera-tion, chiller and system efficiency is im-proved. One circuit can run while theother is stopped for maintenance sooperation will not be interrupted. Thetwo redundant systems offer higherreliability for the chiller and system.

Direct Digital Product IntegratedControl (PIC II) provides unmatchedflexibility and functionality. Each unitintegrates directly with the CarrierComfort Network ® (CCN) system,providing a system solution to controlsapplications.

International Chiller Visual Con- trol (ICVC) can be configured to dis-play units in English or metric and pro-vides unparalleled ease of operation.

The default display offers all in oneglance review of key chiller operation

data, simplifying the interactionbetween chiller and user.

Features include:

• Display of over 125 operating, sta-tus, and diagnostic messages forimproved user interface

• Monitoring of over 100 functionsand conditions to protect the chillerfrom abnormal conditions

• Modular pull-out/plug-in design,reducing wiring requirements andproviding easy installation

• Low-voltage (24 v) design, providingthe ultimate assurance of personalsafety and control integrity

The display modes include 3 standardlanguages: English, Chinese, andKorean.

Automatic capacity override func-tion unloads the compressor whenev-er key safety limits are approached, in-creasing unit life.

Chilled water reset can be accom-plished manually or automatically fromthe building management system. Thereset saves energy when warmerchilled water can be used.

Demand limiting feature limits thepower draw of the chiller during peakloading conditions. When incorporatedinto the Carrier Comfort Networkbuilding automation system, a red linecommand holds chillers at their presentcapacity and prevents any other chill-ers from starting. If a load shedsignal is received, the compressors

are unloaded to avoid high demandcharges whenever possible.

Ramp loading ensures a smoothpulldown of water loop temperatureand prevents a rapid increase in com-pressor power consumption during thepulldown period.

Automated controls test can be ex-ecuted prior to start-up to verify thatthe entire control system is functioningproperly.

365-day real time clock feature al-lows the operator to program a yearlyschedule for each week, weekends,and holidays.

Occupancy schedules can be pro-grammed into the controller to ensurethat the chiller only operates whencooling is required.

Extensive service menu features in-clude password protection to preventunauthorized access to the servicemenu. Built-in diagnostic capabilitiesassist in troubleshooting and recom-mend proper corrective action for pre-set alarms, resulting in greateroperating time.

Alarm file maintains the last 25 timeand date-stamped alarm and alert messages in memory. This function reduc-es troubleshooting time and cost.

Configuration data backup in non-volatile memory provides protectionduring power failures and eliminatestime consuming controlreconfiguration.



4

19XRD refrigeration cycleThe 19XRD chiller includes two inde-pendent refrigerant cycles. In each cy-cle, the compressor continuouslydraws refrigerant vapor from the cool-er at a rate set by the amount of guidevane opening. As the compressor suc-tion reduces the pressure in the cooler,the remaining refrigerant boils at a fair-ly low temperature. The energy re-quired for boiling is obtained from thewater flowing through the cooler tubes.With heat energy removed, the waterbecomes cold enough to use in an air-conditioning circuit or process liquidcooling.

After taking heat from the water, therefrigerant vapor is compressed.Compression adds still more heatenergy and the refrigerant is quitewarm when it is discharged from the

compressor into the condenser.Relatively cool water flowing into thecondenser tubes removes heat fromthe refrigerant, and the vaporcondenses to liquid.

Some refrigerant flashes after itpasses through the float valve andcools the remaining liquid in theFLASC (flash subcooler) chamber. TheFLASC vapor is recondensed on thetubes which are cooled by enteringcondenser water. The liquid drains intoa float valve chamber between theFLASC chamber and cooler. TheAccuMeter™ float valve forms a liquidseal to keep FLASC chamber vaporfrom entering the cooler. When liquidrefrigerant passes through the valve,some of it flashes to vapor in the re-duced pressure on the cooler side.

In flashing, it removes heat from theremaining liquid. The refrigerant isnow at a temperature and pressure atwhich the cycle began. Refrigerantfrom the condenser also cools the oil.

For water-side operation, the chilledwater enters through the drive end cir-cuit and then the chilled water flowsout through the compressor end. Thecondenser water enters through thecompressor end circuit then exitsthrough the drive end. This counter-flow arrangement results in more effi-cient full load and part load operation.Leaving chilled water and enteringcondenser water piping connectionsare on the compressor end of the ma-chine, while entering chilled water andleaving condenser water piping con-nections are on the drive end.

FLASC CHAMBER CONDENSER

CONDENSERWATERIN

CONDENSERWATER

OUT

FLOAT VALVECHAMBER

FILTER DRIER

MOISTUREFLOW INDICATOR

THERMOSTATICEXPANSIONVALVE (TXV)

OIL COOLER

CHILLEDWATER

IN

CHILLEDWATEROUT

COOLER

DISTRIBUTION PIPE

COMPRESSOR

DIFFUSER

IMPELLER

CONDENSERISOLATION VALVE(OPTIONAL)

GUIDEVANES

OILPUMP

TRANSMISSION

LIQUID LINEISOLATION VALVE(OPTIONAL)

ORIFICEFITTINGS

COMPRESSOR

GUIDEVANES

OILCOOLER

THERMOSTATICEXPANSIONVALVE (TXV)

DIFFUSER

IMPELLERTRANSMISSION

FILTER DRIER

MOISTUREFLOWINDICATOR

CONDENSERISOLATION VALVE(OPTIONAL)

FLASC CHAMBER

FLOAT VALVECHAMBER

OILPUMP

ORIFICEFITTINGS

LIQUID LINEISOLATION VALVE(OPTIONAL)

DISTRIBUTION PIPE

DRIVE END

DRIVE END COMPRESSOR END

COMPRESSOR END

19XRD REFRIGERATION CYCLE

a19-1987

Features/Benefits (cont)



5

19XRD — High-Efficiency HermeticCentrifugal Liquid Chiller

19XRD 5 DT DU 57F 587 MF MF H 5A

Motor Voltage CodeCode Volts-Phase-Hertz 54 — 3300-3-50 55 — 6300-3-50 5A 5B 66 — 2400-3-60 67 — 3300-3-60 68 — 4160-3-60 69 — 6900-3-60

——

10000-3-5011000-3-50

Special Order Indicator- — StandardS — Special Order

Motor Efficiency CodeH — High Efficiency

Motor Code(Compressor End Circuit)*

Motor Code(Drive End Circuit)*

Compressor Code (Compressor End Circuit)

Compressor Code (Drive End Circuit)

Heat Exchanger Frame Code5 — Standard Frame

Cooler SizeDQDRDSDTDU

Condenser SizeDQDRDSDTDUDV

* Refer to the 19XRD computer selection program for motor codedetails.

NOTE: The 19XRD is a dual refrigeration circuit chiller. Twocircuits are distinguished by the following descriptions: DriveEnd Circuit and Compressor End Circuit.

a19-1970

Quality Assurance

Certified to ISO 9001

AHRI (Air Conditioning, Heating,and Refrigeration Institute)

ASME‘U’ Stamp

Model number nomenclature



6

Chiller components

1 2 3 4 5 6

789101112131415

COMPRESSOR COMPONENTS

LEGEND

1 — Motor Stator 9 — Impeller2 — Motor Rotor 10 — Pipe Diffuser3 — Motor Shaft Journal Bearings 11 — High Speed Pinion Gear4 — Low Speed Bull Gear 12 — Oil Heater5 — High Speed Shaft Thrust Bearing 13 — High Speed Shaft Bearing6 — High Speed Shaft Bearing 14 — Oil Pump Motor7 — Variable Inlet Guide Vanes 15 — Oil Filter8 — Impeller Shroud

a19-



7

1 2

3 4

5

61

2

34

5

6

7

8

9

10

11

12

11

79

10

12

13

14

13

15

O U T

I N

O U T

I N

16

17

18

19

2018

17

19

20

21

2223

2425

2223

242526

21

27

2829

30 31

2829

3031

O U T

I N

O U T

FRONT VIEW

REAR VIEW

LEGEND

1 — Auxiliary Power Panel 11 — International Chiller Visual Control (ICVC) 21 — Condenser Inlet Temperature Thermistor2 — Motor Housing 12 — Cooler Auto. Reset Relief Valves 22 — Refrigerant Moisture/Flow Indicator3 — Refrigerant Oil Cooler (Hidden) 13 — Pressure Vessel Nameplate 23 — Refrigerant Filter/Drier4 — Oil Level Sight Glass 14 — Cooler Inlet Temperature Thermistor 24 — Liquid Line Isolation Valve (Optional)5 — Guide Vane Actuator 15 — Condenser Outlet Temperature Thermistor 25 — Refrigerant Charging Valve6 — Suction Elbow 16 — Heat Exchanger Connection Plate 26 — Typical Waterbox Drain Port7 — Typical Flange Connection 17 — Condenser Pressure Transducer 27 — Cooler Outlet Temperature Thermistor8 — Chiller Identification Nameplate 18 — Discharge Elbow 28 — Condenser Auto Reset Relief Valves9 — Oil Drain Valve 19 — Motor Power Terminal 29 — Pumpout Valve

10 — Cooler Pressure Transducer 20 — Motor Sight Glass 30 — Discharge Isolation Valve (Optional)31 — Liquid Float Valve Chamber

19XRD CHILLER

a19-1972

a19-1973



8

19XRD COMPRESSOR AND MOTOR WEIGHTS FOR EACH CIRCUIT*

(High Efficiency, Frame Size 5†, Medium and High Voltage)

* Total compressor weight is the sum of the compressor aerodynamiccomponents (compressor weight column), stator, rotor, and end bellcover weights.† Compressor size number is the first digit of the compressor code. SeeModel Number Nomenclature on page 5.**Compressor aerodynamic components weight only. Does not includemotor weight.

19XRD ADDITIONAL COOLER COMPONENT WEIGHTS 19XRD ADDITIONAL CONDENSER COMPONENT WEIGHTS

19XRD HEAT EXCHANGER WEIGHTS FOR EACH MODULE (Standard NIH 150 psig Waterboxes)

*Rigging weights are for standard tubes of standard wall thickness (SUPERE2 and SPIKE FIN 3, 0.025-in. [0.635 mm]).

NOTES:

1. Weight for the heat exchangers is per module. Weight is based on0.025 in. (0.635 mm) wall standard tubing. Refer to E-Cat for spe-cial tubes.

2. All weights for standard 1-pass NIH (nozzle-in-head) design.3. Consult factory for higher pressure design.

MOTOR CODE VOLTAGE CODE

ENGLISH (lb) SI (kg)

CompressorWeight**

MotorWeight

End BellCover Weight

CompressorWeight**

MotorWeight

End BellCover Weight

EL 54, 55, 66, 67, 68, 69 7285 4171 414 3307 1892 188

EM 54, 55, 66, 67, 68, 69 7285 4171 414 3307 1892 188

EN 54, 55, 66, 67, 68, 69 7285 4371 414 3307 1983 188EP 54, 55, 66, 67, 68, 69 7285 4371 414 3307 1983 188

MD5A 7285 4548 414 3307 2063 188

5B 7285 4645 414 3307 2107 188

MF5A 7285 4726 414 3307 2144 188

5B 7285 4890 414 3307 2218 188

COMPONENTFRAME 5

COMPRESSOR

lb kg

Suction Elbow 407 185

Control Panel 34 15

Optional Cooler Inlet Isolation Valve 24 11

COMPONENTFRAME 5

COMPRESSOR

lb kg

Discharge Elbow 325 147

Optional Discharge Isolation Valve 108 49

CODE(FRAMECODE 5)

ENGLISH (lb) SI (kg)Dry Rigging

Weight*Machine Charge

Dry RiggingWeight*

Machine Charge

CoolerOnly

CondenserOnly

Refrigerant Weight Water Weight CoolerOnly

CondenserOnly

Refrigerant Weight Water Weight

Cooler Condenser Cooler Condenser Cooler Condenser Cooler Condenser

DQ 29862 24371 3224 1772 5424 4979 13545 11054 1462 804 2460 2258

DR 30526 24898 3296 1738 5710 5220 13846 11294 1495 788 2590 2368

DS 31273 25416 3534 1706 5999 5461 14185 11529 1603 774 2721 2477

DT 31950 25936 3768 1672 6292 5702 14492 11764 1709 758 2854 2586

DU 32635 26456 4004 1640 6587 5943 14803 12000 1816 744 2988 2696

DV — 26923 — 1606 - 6187 — 12212 — 728 — 2806

Physical data



9

19XRD ADDITIONAL HEAT EXCHANGER WEIGHTS FOR MARINE WATERBOXES*

150 PSIG (1034 kPa) MARINE WATERBOXES

*Add to cooler and condenser weights for total heat exchanger weights.Cooler and condenser weights may be found in the 19XRD ModularUnits Heat Exchanger Weights for Each Module table on page 8.

NOTES:1. Weight for the heat exchangers is per module.2. Consult factory for higher pressure design.

19XRD WATERBOX COVER WEIGHTS

NOTES:1. Weight for a NIH (nozzle-in-head) 1-pass 150 psig cover is already

included in the heat exchanger weights shown on page 8.2. Consult factory for higher pressure design.

Options and accessories

*Factory installed.†Field installed.**Standard waterboxes are nozzle-in-head type, 150 psig (1034 kPa).††Sponsored by ASHRAE (American Society of Heating, Refrigerating,and Air Conditioning Engineers).***Registered trademark of Echelon Corporation.

CODE(FRAMECODE 5)

ENGLISH (lb) SI (kg)

Cooler Condenser Cooler Condenser

DQ 2568 2141 1166 972

DR 2568 2141 1166 972

DS 2568 2141 1166 972

DT 2568 2141 1166 972

DU 2568 2141 1166 972

DV 2568 2141 1166 972

WATERBOXTYPEENGLISH (lb) SI (kg)

Cooler Condenser Cooler Condenser

NIH, 150 psig 1115 855 506 388

Marine, 150 psig 3683 2996 1672 1360

ITEM OPTION* ACCESSORY†

Thermal Insulation (Except Waterbox Covers) X

Marine Waterboxes, 150 psig (1034 kPa)** X

Flanged Cooler and/or Condenser Waterbox Nozzles X

0.028 or 0.035 in. (0.711 or 0.889 mm) Internally/Externally Enhanced Copper Tubing — Cooler X

0.028 or 0.035 in. (0.711 or 0.889 mm) Internally/Externally Enhanced Copper Tubing — Condenser X

Victaulic Connection X

Refrigerant Isolation Valves X

Free-Standing Solid-State Starter X

Free-Standing Across the Line Starter X

BACnet†† Communications X

LonWorks*** Carrier Translator X

Stand-Alone Pumpout Unit X

Separate Storage Tank and Pumpout Unit X

Export Crating X



10

AB

C

COMPRESSOR END

DRIVE END

19XRD DIMENSIONS — NOZZLE-IN-HEAD WATERBOXES

NOTES:1. Service access should be provided per American Society of Heating,

Refrigerating, and Air Conditioning Engineers (ASHRAE) 15, latest edition,National Fire Protection Association (NFPA) 70, and local safety code.

2. ‘A’ length dimensions shown are for standard 150 psig design and flangeconnections.

HEAT EXCHANGERSIZE (FRAME 5)

WATERBOX TYPEWATER

PRESSURE

DIMENSIONS

A (length) B (width) C (height)

ft-in. mm ft-in. mm ft-in. mm

DQ, DR, DS, DT, DU, DV Nozzle-In-Head150 psig

(1034 kPa)21-10 6654 10-8 3 / 8 3261 11-0 9 / 16 3367

a19-1974

Dimensions



11

AB

C

COMPRESSOR END

DRIVE END

19XRD DIMENSIONS — MARINE WATERBOXES

19XRD DIMENSIONS

NOTES:1. Service access should be provided per American Society of Heating,

Refrigerating, and Air Conditioning Engineers (ASHRAE) 15, latest edition,National Fire Protection Association (NFPA) 70, and local safety code.

2. ‘A’ length dimensions shown are for standard 150 psig design and flangeconnections.

HEAT EXCHANGERSIZE (FRAME 5)

WATERBOXTYPE

WATERPRESSURE

DIMENSIONS

A (length) B (width) C (height)

ft-in. mm ft-in. mm ft-in. mmDQ, DR, DS, DT, DU, DV MARINE

150 psig(1034 kPa)

21-10 6654 10-8 3 / 8 3261 11-0 9 / 16 3367

a19-1975



12

Compressor motor controllersCompressor motors, as well as controls and accessories,require the use of starting equipment systems specificallydesigned for 19XRD chillers. Consult your local Carrierrepresentative regarding design information for the selec-tion of starters.

Performance data

19XRD HEAT EXCHANGER MIN/MAX FLOW RATES*

ENGLISH (Gpm) SI (L/s)

*Flow rates based on standard tubes in the cooler and condenser.Minimum flow based on tube velocity of 3 ft/sec (0.91 m/sec);maximum flow based on tube velocity of 12 ft/sec (3.66 m/sec).

Electrical data

AUXILIARY RATINGS(Oil Pump)

(3 Phase, 50/60 Hz)

NOTE: FLA (Full Load Amps) = Sealed kva • 1000/ volts

LRA (Locked Rotor Amps) = Inrush kva • 1000/ • volts

AUXILIARY RATINGS(Controls, Oil Sump Heater)

LEGEND

NOTES:1. Oil sump heater only operates when the compressor is off.2. Power to oil heater/controls must be on circuits that can provide continuous

service when the compressor is disconnected.

COOLERCODE

FLOW RATE CONDENSERCODE

FLOW RATE

Min Max Min Max

DQ 3329 13,388 DQ 3763 15,136

DR 3624 14,575 DR 4006 16,112

DS 3922 15,775 DS 4248 17,087

DT 4224 16,988 DT 4491 18,063

DU 4528 18,213 DU 4733 19,038

DV 4979 20,025

COOLERCODE

FLOW RATE CONDENSERCODE

FLOW RATE

Min Max Min Max

DQ 210 845 DQ 237 955

DR 229 920 DR 253 1017

DS 247 995 DS 268 1078

DT 266 1072 DT 283 1140

DU 286 1149 DU 299 1201

DV 314 1263

ITEMAVERAGE

kW

MIN/MAXMOTOR

VOLTAGE/ FREQUENCY

V-Ph-Hz

INRUSHkva

SEALEDkva

OIL

PUMP

1.35

200/240-3-60 9.34 1.65

380/480-3-60 9.09 1.60

507/619-3-60 24.38 2.08

1.50220/240-3-50 11.15 1.93

346/440-3-50 8.30 1.76

3—

3—

ITEM POWER SUPPLY SEALED

kvaAVERAGE

WATTS

CONTROLS 24-vac 0.12 120

OIL SUMPHEATERV-Ph-Hz

115 V or 230 V,Single Phase,50 or 60 Hz

—2200

(Frame 5 Compressor)

SRD — Split Ring Diffuser

Selection procedure



13

Integrated controlsThe 19XRD controls maintain both compressor circuit op-erations at the best efficiency while maintaining the definedload. This is accomplished by designating one circuit as thelead and the other as the lag. The lead circuit has the pri-mary responsibility of controlling capacity to meet the de-mand requirements. When the demand exceeds a config-ured limit, the lag compressor will start. The lag circuit isconfigured so that it will match the percent capacity of thelead. When the load reduces below a defined deadband,the lag circuit will be directed to stop, and the lead will in-crease capacity to meet the demand.

To enable operation of one circuit during maintenance ofthe other circuit, compressors have to be selected so thateither circuit can operate when the other circuit is com-pletely shut down. The system design includes controlfunctions, safeties, and starters provided independently ineach circuit. This is accomplished with the 19XRD soft-ware design, which maintains a synchronized overall chilleroperational status at either control panel, regardless of itslead or lag position.

Control systemThe microprocessor control on each Carrier centrifugalchiller is factory mounted, wired, and tested to ensure ma-chine protection and efficient capacity control. In addition,the program logic ensures proper starting, stopping, andrecycling of the chiller and provides a communication link to the Carrier Comfort Network ® (CCN) system.

19XRD large centrifugal resident redundantcontrol (RRC)The control scheme used on the 19XRD enables both re-dundant operation of each individual circuit and consolidat-ed control of the chiller system.

To enable this, each circuit has a dedicated controller thatcan operate independently. Control of the chiller systemand consolidation of the chiller status is achieved via resi-dent redundant control (RRC) software, which is embeddedinto each controller. In operation, one of two circuits isconfigured as the master circuit, which then coordinatescontrol of the system in addition to being the lead circuitduring operation while the other controller acts as theslave. Additionally, both the master and slave controllersshare and maintain synchronization of the chiller status. Asa result, each of the circuit controller’s interface providesstatus and control capability of the system as well as eachcircuit.

The 19XRD consists of two centrifugal compressors each

operating in an independent refrigerant circuit, configuredin series counterflow, thus providing higher system effi-ciency. The design intent of the 19XRD concept is to op-erate both circuits as one, while allowing redundant circuitoperation.

To enable redundant operation, each circuit maintains itsown user interface display, control microprocessor, sensorI/O, operating software and safety protection system. Inthis manner when one circuit if out of operation, the othercircuit may operate independently.

The RRC software application resides on each individuacircuit’s controller software to provide consolidated controand overall chiller operating conditions at either circuit useinterface. This is achieved by designating one circuit controller as the master, providing operation control of bothcircuits and consolidation of the overall chiller status. Themaster and slave controller continuously update all relevandata such that either controller can provide accurate status

of the system. When designated as the master circuit, alsystem control occurs from this circuit. Additionally, thiscircuit also operates as the lead when sequencing the twocircuits.

FeaturesControl system

• component test and diagnostic check • programmable recycle allows chiller to recycle at opti

mum loads for decreased operating costs• menu-driven keypad interface for status display, se

point control, and system configuration• CCN compatible• primary and secondary status messages• individual start/stop schedules for local and CCN opera

tion modes• recall of up to 25 alarm/alert messages with diagnosti

help• optional soft stop unloading closes guide vanes to

unload the motor to the configured amperage leveprior to stopping

• languages pre-programmed at factory for English, Chinese, or Korean (ICVC only)

• an ILT (international language translator) is available foconversion of extended ASCII characters

Resident Redundant Controller Software

Lead Circuit Lag Circuit

Circuit

devices

Circuit

devices

Starter

devices

Starter

devices

Circuit I/O(CCM)

Circuit I/O(CCM)

Starter I/O(ISM)

Starter I/O

(ISM)

SIO Bus SIO Bus

Circuit Controller & Interface(ICVC) Circuit Controller & Interface(ICVC)

Master Controller

(ICVCX Software) Slave Controller

(ICVCX Software) CCN Bus

RESIDENT REDUNDANT CONTROLLER

a19-1986

LEGENDCCM — Chiller Control ModuleCCN — Carrier Comfort NetworkICVC — International Chiller Visual ControllerI/O — Input/Output

ISM — Integrated Starter Module

Controls



14

Safety cutouts

• bearing oil high temperature*• motor high temperature*†• refrigerant (condenser) high pressure*†• refrigerant (cooler) low temperature*†• lube oil low pressure• compressor (refrigerant) discharge temperature*• under voltage**• over voltage**• oil pump motor overload• motor overload†• motor acceleration time• intermittent power loss• compressor starter faults• compressor surge protection*• low level ground fault

medium voltage — phase to ground• cooler freeze protection

Capacity control• leaving chilled water control• entering chilled water control• soft loading control by temperature or load ramping• guide vane actuator module• power (demand) limiter• auto. chilled water reset

Interlocks

• manual/automatic remote start

• starting/stopping sequencepre-lube/post-lubepre-flow/post-flow

• compressor starter run interlock • pre-start check of safeties and alerts• low chilled water (load) recycle• monitor/number compressor starts and run hours• manual reset of safeties

Indications

• chiller operating status message• power-on• pre-start diagnostic check • compressor motor amps• pre-alarm alert††• alarm• contact for remote alarm• safety shutdown messages• elapsed time (hours of operation)• chiller input kW

*These can be configured by user to provide alert indication at user-defined limit.

†Override protection: Causes compressor to first unload and then, ifnecessary, shut down.**Will not require manual reset or cause an alarm if auto-restart afterpower failure is enabled.††By display code only.

19XRD CONTROL PANEL DISPLAY (Front View)

ICVC ENGLISH DISPLAY

Controls (cont)



15

19XRD INSIDE PANEL COVER

19XRD CONTROL PANEL COMPONENT LAYOUT

a19-1594ef

a19-1595ef

LEGEND

CB — Circuit BreakerCCM — Chiller Control ModuleICVC — International Chiller

Visual Control



16

15

1 2

15

14

15

13

16

2

1

1#

8 #

4 #

5 # 6 #

8# 8# 7# 9#

OIL PUMPPOWER

MAINPOWER

CHILLEDWATER PUMP

CONDENSERWATER PUMP

COOLINGTOWER FAN

1 0 #

1 0 #

T O C O O L

I N G

T O W E R

DRAIN

34

34 5

6

7

8

9

8

10

5

6

11

F R O M

B U I L D I N G

T O B U I L D

I N G

F R O M C

O O L I N G

T O W E R

LEGEND

1 — Circuit Breaker

2 — Freestanding Starter

3 — Compressor Motor Terminal Box

4 — Power Panel

5 — Pressure Gage

6 — Strainer

7 — Condenser Water Pump

8 — Control Panel

9 — Communication Wire

10 — Vent11 — Chilled Water Pump

12 — Chilled Water Pump Starter

13 — Condenser Water Pump Starter

14 — Cooling Tower Fan Starter

15 — Circuit Breaker

16 — Oil Pump Circuit Breaker

Piping

Control Wiring

Power Wiring

NOTES:1. Wiring and piping shown are for general point-of-

connection only and are not intended to showdetails for a specific installation. Certified field wir-

ing and dimensional diagrams are available onrequest.2. All wiring must comply with applicable codes.

19XRD CHILLER WITH FREE-STANDING STARTER

WIRING LEGEND

WIRENUMBER

DESCRIPTION SPECIFICATION

1# Power Supply

3 Phase High/Medium Voltage Main Power Supply WireGround Wire3 Ph / 50 Hz / 346 to 440 V / 10A or3 Ph / 60 Hz / 380 to 460 V / 10A Oil Pump Power Supply

4#Starter to CoolingTower Fan Starter

4 Pieces Control Wire (Field-installed, if required)

5#Starter toCondenser WaterPump Starter


6#Starter to ChilledWater PumpStarter


7#Starter to OilHeater Contactor

See auxiliary ratings

8#Starter to Oil PumpContactor

See auxiliary ratings

9#Starter to PowerPanel Contactor

2 Sets 600V Shielded Wire

10# Starter to Motor2 Sets of 3 Phase High/Medium Voltage Power Wire1 Piece Ground Wire

a19-1976

Typical piping and wiring



17

19XRD MACHINE FOOTPRINT

a19-1977

Application data



18

19XRD ISOLATION PACKAGE

TYPICAL ISOLATION WITH SOLEPLATE TYPICAL ISOLATION WITHOUT SOLEPLATE

SOLEPLATE DETAIL

NOTES:1. Dimensions in ( ) are in millimeters.2. Standard soleplate package includes 8 soleplates, 32 jacking screws and level-

ing pads. Requires isolation package.3. Jacking screws to be removed after grout has set.4. Thickness of grout will vary, depending on the amount necessary to level chiller.

Use only pre-mixed non-shrinking grout, Ceilcote 748 or Chemrex Embelo 636Plus Grout 636, 0-11 / 2 (38.1) to 0-21 / 4 (57) thick.

NOTE: Isolation package includes 8 shear flex pads.

a19-985

a23-46tf

a19-1110tf

Application data (cont)



19

COMPRESSOR ENDDRIVE END

COOLERCOOLER

CONDCOND

1

4

3

2

COMPRESSOR ENDDRIVE END

COOLERCOOLER

CONDCOND

1

2

3

4

19XRD NOZZLE ARRANGEMENTS

NOZZLE-IN-HEAD WATERBOXES

MARINE WATERBOXES

WATERBOX PASS In OutArrangement

CodeNozzle Diameter

(in.)

COOLER 1 1 3 A 18

CONDENSER 1 2 4 P 24


CodeNozzle Diameter

(in.)

COOLER 1 1 3 A 18CONDENSER 1 2 4 P 24

a19-1985



20

4

1

2

3

19XRD NOZZLE ARRANGEMENTS (cont)

MARINE WATERBOXES (cont)


CodeNozzle Diameter

(in.)

COOLER 1 1 3 A 18

CONDENSER 1 2 4 P 24

a19-1979

a19-1978




21

RELIEF VALVE ARRANGEMENTS

UNITS WITH OPTIONAL ISOLATION VALVE

UNITS WITHOUT OPTIONAL ISOLATION VALVE

a19-1981

a19-1980



22

Vent and drain connectionsNozzle-in head waterboxes have vent and drain connec-tions on covers. Marine waterboxes have vent and drainconnections on waterbox shells.

Provide high points of the chiller piping system withvents and the low points with drains. If shutoff valves areprovided in the main water pipes near the unit, a minimal

amount of system water is lost when the heat exchangersare drained. This reduces the time required for drainageand saves on the cost of re-treating the system water.

It is recommended that pressure gages be provided atpoints of entering and leaving water to measure pressuredrop through the heat exchanger. Gages may be installedin each waterbox. Pressure gages installed at the vent anddrain connections do not include nozzle pressure losses.

Use a reliable differential pressure gage to measure pres-sure differential when determining water flow. Regulargages of the required pressure range do not have the accu-racy to provide accurate measurement of flow conditions.

ASME stamping

All 19XRD heat exchangers are constructed in accordancewith ASHRAE (American Society of Heating, Refrigerat-ing, and Air Conditioning Engineers) 15 Safety Code forMechanical Refrigeration (latest edition). This code, inturn, requires conformance with ASME (American Societyof Mechanical Engineers) Code for Unfired Pressure Ves-sels wherever applicable. Each heat exchanger is ASME‘U’ stamped on the refrigerant side of each vessel.

Relief valve discharge pipe sizingRelief-valve discharge piping size should be calculated perthe current version of the ASHRAE 15, latest edition.

Carrier further recommends that an oxygen sensor beinstalled to protect personnel. Sensor should be able tosense the depletion or displacement of oxygen in the ma-chine room below 19.5% volume oxygen per ASHRAE15, latest edition.

Design pressuresDesign and test pressures for heat exchangers are listedbelow.

DESIGN AND TEST PRESSURES150 PSIG (1034 KPA UNITS)

*Nitrogen/Helium.

Factory insulationThe factory insulation option for the 19XRD chiller in-cludes the following areas: cooler; suction line up to thecompressor suction housing; compressor motor and motorcooling return lines; several small oil cooling and oil returnsystem lines and the liquid line. Insulation applied at thefactory is 3/ 4 in. (19 mm) thick.

Insulation at jobsite — As indicated in the Condensa-tion vs Relative Humidity table, the factory insulation pro-vides excellent protection against condensation under mostoperating conditions. If temperatures in the equipmentarea exceed the maximum design conditions, extra insula-tion is recommended.

High humidity jobsite locations may require field sup-plied and installed insulation on the float chamber, suctionhousing, and the lower half of the condenser.

CONDENSATION VS RELATIVE HUMIDITY*

*These approximate figures are based on 35 F (1.7 C) saturated suctiontemperature. A 2° F (1.1° C) change in saturated suction temperaturechanges the relative humidity values by 1% in the same direction.

HEAT

EXCHANGER

FRAME

SIZE

RELIEF VALVEESCAPE SIZE

(NPT)

COOLER 5 1-1/4

CONDENSER 5 1-1/4

PRESSURESSHELL SIDE(Refrigerant)

STANDARD TUBESIDE (Water)

psig kPa psig kPaLeak Test at Design Pressure*

185 1276 150 1034

Hydrostatic — — 195 1344

Proof Test* 204 1407 — —

AMOUNT OFCONDENSATION

ROOM DRY-BULB TEMP

80 F (27 C) 90 F (32 C) 100 F (38 C)

% Relative HumidityNone 80 76 70Slight 87 84 77Extensive 94 91 84




24

Packaged Hermetic Centrifugal LiquidChiller

HVAC Guide Specifications

Size Range:

2500 to 3000 Tons(8790 to 10548 kW) Nominal

Carrier Model Number: 19XRD

Part 1 — General

1.01 SYSTEM DESCRIPTION

A. Microprocessor-controlled liquid chiller shall use asingle stage, semi-hermetic centrifugal compressorusing refrigerant HFC-134a. Chiller shall consist oftwo compressors and two individual refrigerantcycles which shall increase redundancy.

B. If a manufacturer proposes a liquid chiller usingHCFC-123 refrigerant, then the manufacturer shallinclude in the chiller price:

1. A vapor activated alarm system shall be capableof responding to HCFC-123 levels of 10 ppmAllowable Exposure Limit (AEL).

2. External refrigerant storage tank and pumpoutunit.

3. Zero emission purge unit capable of operatingeven when the chiller is not operating.

4. Back-up relief valve to rupture disk.

5. Chiller pressurizing system to prevent leakageof noncondensables into chiller during shut-down periods.

6. Plant room ventilation.

1.02 QUALITY ASSURANCE

A. Chiller performance shall be rated in accordancewith AHRI Standard 550/590, latest edition.

B. Equipment and installation shall be in compliancewith ANSI/ASHRAE 15 (latest edition).

C. Cooler and condenser refrigerant side shall bedesigned and compliant with ASME Section VIII,division 1 code for unfired pressure vessels.

D. Unit shall be certified in accordance with ISO 9001manufacturing quality standard.

E. Chiller shall be designed and constructed to meetUL listing (below 6 kV) requirements.

F. Centrifugal compressor impellers shall be dynami-

cally balanced and over-speed tested by the manu-facturer at a minimum of 120% design operatingspeed. Each compressor assembly shall undergo amechanical run-in test to verify vibration levels, oilpressures, and temperatures are within acceptablelimits.

Each compressor assembly shall be proof tested at aminimum 204 psig (1406 kPa) and leak tested at185 psig (1276 kPa) with a tracer gas mixture.

G. Entire chiller assembly shall be proof tested at204 psig (1406 kPa) and leak tested at 185 psig(1276 kPa) with a tracer gas mixture on the

refrigerant side. The water side of each heatexchanger shall be hydrostatically tested at 1.3 timesrated working pressure.

H. Prior to shipment, the chiller automated controlstest shall be executed to check for proper wiring andensure correct controls operation.

I. The 19XRD selection program shall be rated in

accordance with AHRI Standard 550/590, latestedition.

1.03 DELIVERY, STORAGE AND HANDLING

A. Unit shall be stored and handled in accordance withmanufacturer's instructions.

B. Unit shall be shipped with all refrigerant piping andcontrol wiring factory installed.

C. Unit shall be shipped charged with oil and fullcharge of refrigerant HFC-134a or a nitrogen hold-ing charge as specified on the equipment schedule.

D. Unit shall be shipped with firmly attached labels thatindicate name of manufacturer, chiller model num-ber, chiller serial number, and refrigerant used.

E. Unit shall be shipped in either modular configuration(2 pieces for field-assembly) or integrated configura-tion (one piece assembled).

F. If the chiller is to be exported, the unit shall be suffi-ciently protected from the factory against sea watercorrosion to be suitable for shipment in a standardopen top, ocean shipping container (if chiller is tobe disassembled only).

1.04 WARRANTY (U.S. and Canada Only)

Warranty shall include parts and labor for one yearafter start-up or 18 months from shipment, which-ever occurs first. A refrigerant warranty shall be pro-vided for a period of five years.

Part 2 — Products

2.01 EQUIPMENT

A. General:

Factory assembled liquid chiller shall consist com-pressor, motor, lubrication system, cooler, con-denser, initial oil charge, microprocessor controlsystem, and documentation required prior to start-up.

B. Compressor:

1. Two centrifugal compressors of the high perfor-mance, single-stage type.

2. Compressor, motor, and transmission shall behermetically sealed into a common assemblyand arranged for easy field servicing.

3. Internal compressor parts must be accessiblefor servicing without removing the compressorbase from the chiller. Connections to the com-pressor casing shall use O-rings instead of gas-kets to reduce the occurrence of refrigerantleakage. Connections to the compressor shallbe flanged or bolted for easy disassembly.

Guide specifications



25

4. Pressure transducers shall be capable of fieldcalibration to ensure accurate readings and toavoid unnecessary transducer replacement.Transducers shall be serviceable without theneed for refrigerant charge removal orisolation.

5. Transmission shall be single ratio, single helical,parallel shaft speed increaser. Gears shall con-form to AGMA Standards, Quality II.

6. Roller element bearings shall be of the steelbacked babbitt lined type. The thrust bearingshall be tilting pad or rolling element type.

7. Centrifugal compressors shall use variable inletguide vanes to provide capacity modulationwhile also providing pre-whirl of the refrigerantvapor entering the impeller for more efficientcompression at all loads.

8. Centrifugal compressors shall be provided witha factory-installed lubrication system to deliveroil under pressure to bearings and transmission.Included in the system shall be:

a. Hermetic driven rotary vane oil pump withfactory-installed motor contactor with over-load protection.

b. Refrigerant-cooled oil cooler.

c. Oil pressure regulator.

d. Oil filter with isolation valves to allow filterchange without removal of refrigerant charge.

e. Oil sump heater controlled from unitmicroprocessor.

f. Oil reservoir temperature sensor with maincontrol center digital readout.

g. Compressor shall be fully field serviceable.

9. Split ring diffuser shall be designed for opera-tion at normal and high lift conditions.

C. Motor:

1. Compressor motor shall be of the semi-hermetic, liquid refrigerant cooled, squirrelcage, induction type suitable for voltage shownon the equipment schedule.

2. If an open drive motor is provided, a compres-sor shaft seal leakage containment system shallbe provided:

a. An oil reservoir shall collect oil and refriger-ant that leaks past the seal.

b. A float device shall be provided to openwhen the reservoir is full, directing therefrigerant/oil mixture back into the com-pressor housing.

c. A refrigerant sensor shall be located next tothe open drive seal to detect leaks.

3. Motors shall be suitable for operation in arefrigerant atmosphere and shall be cooled byatomized refrigerant in contact with the motorwindings.

4. Motor stator shall be arranged for service oremoval with only minor compressordisassembly and without removing main refrigerant piping connections.

5. Full load operation of the motor shall noexceed nameplate rating.

6. One motor winding temperature sensor (and

one spare) shall be provided.7. Should the mechanical contractor choose to

provide a chiller with an open motor instead othe specified semi-hermetic motor, the contractor shall install additional cooling equipment todissipate the motor heat as per the followingformula:

Btuh = (FLkW motor) (0.05) (3413)

Btuh = (FLkW motor) (171)

and, alternately

Tons = Btuh / 12,000

The additional piping, valves, air-handlingequipment, insulation, wiring, switchgeachanges, ductwork, and coordination with othertrades shall be the responsibility of the mechanical contractor. Shop drawings reflecting anychanges to the design shall be included in thesubmittal, and incorporated into the finaas-built drawings for the project.

8. Also, if an open motor is provided, a mechanical room thermostat shall be provided andset at 104 F (40 C). If this temperature isexceeded, the chillers shall shut down and analarm signal shall be generated to the centraEnergy Management System (EMS) displaymodule prompting the service personnel to

diagnose and repair the cause of the over temperature condition. The mechanical contractorshall be responsible for all changes to thedesign, including coordination with temperaturecontrol, electrical and other trades. In additionthe electrical power consumption of any auxiliary ventilation and/or mechanical coolingrequired to maintain the mechanical room conditions stated above shall be considered in thedetermination of conformance to the scheduledchiller energy efficiency requirement.

D. Cooler and Condenser:

1. Cooler shall be of shell and tube type construction with single pass. Units shall be fabricatedwith high-performance tubing, steel shell, andtube sheets with fabricated steel waterboxes.

a. Waterbox shall be nozzle-in-head waterbox(150 psig).

b. Waterbox shall have standard nozzle flangecompliant with ASME.

2. Condenser shall be of shell and tube type construction with single pass. Units shall be fabricated with high-performance tubing, steel shelland tube sheets with fabricated steel waterboxes.



26

a. Waterbox shall be nozzle-in-head type water-box (150 psig).

b. Waterbox shall have standard nozzle flangecompliant with ASME.

3. Waterboxes shall have vents, drains, and coversto permit tube cleaning within the space shownon the drawings. A thermistor type temperature

sensor shall be factory installed in each waternozzle.

4. Tubes shall be individually replaceable from theend of the heat exchanger without affecting thestrength and durability of the tube sheet andwithout causing leakage in adjacent tubes.

5. Tubing shall be copper, high-efficiency type,with integral internal and external enhance-ment unless otherwise noted. Tubes shall benominal 3/ 4-in. OD with nominal wall thicknessof 0.025 in. measured where the tubes are incontact with the end tube sheets unless other-wise noted. Tubes shall be rolled into tubesheets and shall be individually replaceable.Tube sheet holes shall be double grooved for joint structural integrity.

6. Cooler shall be designed to prevent liquid refrig-erant from entering the compressor via spaceelimination (spacing between top of evaporatoror cooler tubing and suction elbow). Devicesthat introduce pressure losses (such as misteliminators) shall not be acceptable becausethey are subject to structural failures that canresult in extensive compressor damage.

7. The condenser shell shall include a FLASC(flash subcooler) which cools the condensed liq-uid refrigerant to a reduced temperature,

thereby increasing the refrigeration cycleefficiency.

8. A relief valve shall be installed on each heatexchanger.

E. Refrigerant Flow Control:

1. To improve part load efficiency, liquid refriger-ant shall be metered from the condenser to thecooler using a float-type metering valve tomaintain the proper liquid level of refrigerant inthe heat exchangers under both full and partload operating conditions.

2. The float valve chamber shall have a boltedaccess cover to allow field inspection and the

float valve shall be field serviceable.F. Controls, Safeties, and Diagnostics:

1. Controls:

a. The chiller shall be provided with a factoryinstalled and wired microprocessor controlcenter. The control center shall include a16-line by 40-character liquid crystal display,4 function keys, stop button, and alarmlight. The microprocessor can be configuredfor either English or SI units. The chillercontrol shall consist of two individual ICVC

(international chiller visual control) devicesand is programmed for lead-lag operation.

b. All chiller and starter monitoring shall be dis-played at the chiller control panel.

c. The controls shall make use of non-volatilememory.

d. The chiller control system shall have the abil-

ity to interface and communicate directly tothe building control system.

e. The default standard display screen shallsimultaneously indicate the following mini-mum information:

1) date and time of day2) 24-character primary system status

message3) 24-character secondary status message4) chiller operating hours5) entering chilled water temperature6) leaving chilled water temperature7) entering condenser water temperature

8) leaving condenser water temperature9) oil supply pressure10) oil sump temperature11) percent motor rated load amps (RLA)

f. In addition to the default screen, statusscreens shall be accessible to view the statusof every point monitored by the control cen-ter including:

1) evaporator pressure2) condenser pressure3) bearing oil supply temperature4) compressor discharge temperature5) motor winding temperature6) number of compressor starts

7) control point settings8) discrete output status of various devices9) compressor motor starter status

10) optional spare input channels11) line current and voltage for each phase12) frequency, kW, kW-hr, demand kW

g. Schedule Function:

The chiller controls shall be configurable formanual or automatic start-up and shutdown.In automatic operation mode, the controlsshall be capable of automatically starting andstopping the chiller according to a storeduser programmable occupancy schedule.

The controls shall include built-in provisionsfor accepting:

1) A minimum of two 365-day occupancyschedules.

2) Minimum of 8 separate occupied/ unoccupied periods per day.

3) Daylight savings start/end.4) 18 user-defined holidays.5) Means of configuring an occupancy

timed override.6) Chiller start-up and shutdown via remote

contact closure.

Guide specifications (cont)



27

h. Service Function:

The controls shall provide a password pro-tected service function which allows autho-rized individuals to view an alarm history filewhich shall contain the last 25 alarm/alertmessages with time and date stamp. Thesemessages shall be displayed in text form, notcodes.

i. Dual Compressor Control:

The control system shall cycle the chillers ina manner to maintain optimal chiller effi-ciency while properly maintaining the leav-ing chiller set point. The sequencing of thecompressors shall be configurable by theuser. The control system shall allow opera-tion of one compressor when the other com-pressor is powered off for service.

j. Network Window Function:

Each chiller control panel shall be capable ofviewing multiple point values and statuses

from other like controls connected on acommon network, including controller main-tenance data. The operator shall be able toalter the remote controller’s set points ortime schedule and to force point values orstatuses for those points that are operatorforcible. The control panel shall also haveaccess to the alarm history file of all like con-trollers connected on the network.

k. Pump Control:

Upon request to start the compressor, thecontrol system shall start the chilled waterpump, condenser water pumps and verifythat flows have been established.

l. Ramp Loading:

A user-configurable ramp loading rate, effec-tive during the chilled water temperaturepulldown period, shall control the rate ofguide vane opening to prevent a rapidincrease in compressor power consumption.The controls shall allow configuration of theramp loading rate in either degrees/minuteof chilled water temperature pulldown orpercent motor amps/minute. During theramp loading period, a message shall be dis-played informing the operator that thechiller is operating in ramp loading mode.

m. Chilled Water Reset:The control center shall allow reset of thechilled water temperature set point based onany one of the following criteria:

1) Chilled water reset based on an external4 to 20 mA signal.

2) Chilled water reset based on a remotetemperature sensor (such as outdoorair).

3) Chilled water reset based on water tem-perature rise across the evaporator.

n. Demand Limit:

The control center shall limit amp draw othe compressor to the rated load amps or toa lower value based on one of the followingcriteria:

1) Demand limit based on a user inpuranging from 40% to 100% of compres

sor rated load amps.2) Demand limit based on external 4 to20 mA signal.

o. Controlled Compressor Shutdown:

The controls shall be capable of being configured to soft stop the compressor. Whenthe stop button is pressed or remote contacts open with this feature active, the guidevanes shall close to a configured amperagelevel and the machine shall then shut downThe display shall indicate “shutdown in progress.”

2. Safeties:

a. Unit shall automatically shut down when anyof the following conditions occur: (Each othese protective limits shall require manuareset and cause an alarm message to be displayed on the control panel screen, informing the operator of the shutdown cause.)

1) motor overcurrent2) over voltage*3) under voltage*4) single cycle dropout*5) bearing oil high temperature6) low evaporator refrigerant temperature7) high condenser pressure8) high motor temperature

9) high compressor discharge temperature10) low oil pressure11) prolonged surge12) loss of cooler water flow13) loss of condenser water flow14) starter fault

*Shall not require manual reset or cause analarm if auto-restart after power failure isenabled.

b. The control system shall detect conditionthat approach protective limits and take selfcorrective action prior to an alarm occur-ring. The system shall automatically reduce

chiller capacity when any of the followingparameters are outside their normal operating range:

1) high condenser pressure2) high motor temperature3) low evaporator refrigerant temperature4) high motor amps.



c. During the capacity override period, a pre-alarm (alert) message shall be displayedinforming the operator which condition iscausing the capacity override. Once thecondition is again within acceptable limits,the override condition shall be terminatedand the chiller shall revert to normal chilledwater control. If during either condition the

protective limit is reached, the chiller shallshut down and a message shall be dis-played informing the operator which con-dition caused the shutdown and alarm.

d. Internal built-in safeties shall protect thechiller from loss of water flow. Differentialpressure switches shall not be allowed to bethe only form of freeze protection.

3. Diagnostics and Service:

a. A self diagnostic controls test shall be anintegral part of the control system to allowfor quick identification of malfunctioningcomponents.

b. Once the controls test has been initiated,all pressure and temperature sensors shallbe checked to ensure they are within nor-mal operating range. A guide vane actuatortest shall open and close the guide vanes tocheck for proper operation. The operatormanually acknowledges proper guide vaneoperation prior to proceeding to next test.

c. In addition to the automated controls test,the controls shall provide a manual testwhich permits selection and testing of indi-vidual control components and inputs. Athermistor test and transducer test shall dis-

play on the control screen the actual read-ing of each transducer and each thermistorinstalled on the chiller. All out-of-range sen-sors shall be identified.

G. Electrical Requirements:

1. Electrical contractor shall supply and installmain electrical power line, disconnectswitches, circuit breakers, and electricalprotection devices per local code requirementsand as indicated necessary by the chillermanufacturer.

2. Electrical contractor shall wire local electricalpower line to the starter and the starter power

circuit to the chiller compressor motor.3. Electrical contractor shall wire the starter con-

trol circuit and chiller power panel control cir-cuit to the chiller control circuit.

4. Electrical contractor shall wire the chilledwater pump, condenser water pump, andtower fan control circuit to the chiller controlcircuit.

5. Electrical contractor shall supply and installelectrical wiring and devices required tointerface the chiller controls with the buildingcontrol system if applicable.

6. Electrical power shall be supplied to the unit atthe voltage, phase, and frequency listed in theequipment schedule.

H. Piping Requirements — Instrumentation andSafeties:

1. Mechanical contractor shall supply and installpressure gages in readily accessible locationsin piping adjacent to the chiller such that theycan be easily read from a standing position onthe floor. Scale range shall be such that designvalues shall be indicated at approximately mid-scale.

2. Gages shall be installed in the entering andleaving water lines of cooler and condenser.

I. Vibration Isolation:

1. Chiller manufacturer shall furnish neoprene

isolator pads for mounting equipment on alevel concrete surface.

2. Chiller manufacturer shall also furnish a sole-plate package consisting of soleplates, jackingscrews, leveling pads, and neoprene pads.

J. Start-up:

1. The chiller manufacturer shall provide a fac-tory-trained representative, employed by thechiller manufacturer, to perform the start-upprocedures as outlined in the Start-up, Opera-tion and Maintenance manual provided by thechiller manufacturer.

2. Manufacturer shall supply the following litera-

ture:a. Start-up, operation and maintenance

instructions.

b. Installation instructions.

c. Field wiring diagrams.

d. One complete set of certified drawings.

K. Special Features:

1. Cooler and Condenser Tubes:

Contact local Carrier representative for othertube offerings.

2. Marine Waterboxes, 150 psig (1034 kPa):

Unit manufacturer shall furnish marine stylewaterboxes on cooler and/or condenser ratedat 150 psig (1034 kPa).

3. Optional Compressor Discharge IsolationValve and Liquid Line Ball Valve:

These items shall be factory installed to allowisolation of the refrigerant charge in the con-denser for servicing the compressor.

Guide specifications (cont)

carrier chiller catalog

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