Ammonia Liquid Chiller Series DX RR, LR, VR - Grasso RR800.pdfGrasso GmbH Refrigeration Technology...

Refrigeration Division

Grasso

2002.03/1 _636979_pi_dxr__gbr_.DOC

Ammonia Liquid Chiller

Series DXRR, LR, VR

Product Information

Copyright Grasso GmbH Refrigeration Technology

The contents of this documentation and the enclosed drawings, sketches and diagrams are intended only for plantusers and operating personnel. They may be neither duplicated nor divulged to third parties or firms withoutwritten consent.

The technical data, figures, dimensions and weights presented in the documentation may be more closely definedor otherwise specified as a result of contractual agreement and are binding only after our confirmation in writing.The stipulations set forth in the contract have precedence over those in this documentation.

We reserve all rights to introduce technical modifications in the course of further development.

Grasso Refrigeration Division

PRODUCT INFORMATION

AMMONIA LIQUID CHILLERDRY EVAPORATION

00.10 DX Chiller types RR, LR, VR 634219E.DOC - 1

TABLE OF CONTENTS

Introduction 634 220E

Series - Overview 633 118E

Product Name 634 212E

Description of Function and Design, Optional Equipment 636 271E

Power Parameters Types RR 200 ... 350 634 211E



Main DimensionsWeights and Charging Quantities Types RR 200 ... 350 634 214E



Modular Standard Control Device — Grasso Screw Control (GSC) 636 288E

Absorption Device 060 920E


INTRODUCTION


00.10 DX Chiller types RR, LR, VR 634220E.DOC- 1

INTRODUCTION

The ammonia liquid chillers DX Series (dry evaporation)are established components for complete refrigerationand airconditioning systems.

The only used refrigerant is ammonia, because it has ahigh specific refrigeration capacity, a low energyrequirement and a favourable price. In additionammonia behaves absolutely harmless to theenvironment.

The RR chiller series consists of 12 model types withestablished Grasso screw compressors.

The capacity range covers from 200 kW up to 1600 kWregarding air conditioning application formanufacturing cold water.

The hole DX chiller programme consists of 3 series withdifferent condenser types working according toprinciple of dry evaporation.

Ammonia liquid chillers for dry evaporation (DX chiller)consists of the following main components:

1. Drive-line (screw compressor, driving motor, oilseparator)

2. Evaporator with basic frame, carrying the drive-line3. Condenser, alternative

• built on shell and tube type

• external evaporative condenser or air cooledcondenser

4. Low voltage system with control device.

Ammonia liquid chiller can be delivered in version RRfor complete capacity range of model types 200 - 1600as standard ready for connecting, complete with pipesand wiring.

The complete combination of drive line and evaporatorcan be delivered for versions LR and VR, so that thecondenser only have to connect on site (splitinstallation).

The DX chillers are designed according to the3 different concepts of Grasso screw compressors.Because of that compact designed DX chiller carriedout.

That is the reason of the compact design of DX Chillers.

The standard model types valid for the namedconditions (see overview - cold water 12°C/ 6°C andcooling water 26°C/ 32°C).

Each model size can be delivered with exact adaptedevaporators and condensers deviating of standard aswell as with different secondary refrigerants andcooling mediums. These special models require changesconcerning the standard dimensions.

You'll find defined power parameters as selection tablesin this product information. These table values serve fora first model type selection. For the concrete applicationfield the values have to confirm by Grasso.

Ammonia liquid chiller DX types are eqipped with astandard PLC type SIMATIC S5 95U (control device). Alighted LED-terminal displays all operation and failuremessages as well as all process data. The display consistsof robust laminated push-buttons (6 function buttonsand 24 system buttons).

Each DX chiller can optionally be equipped with anabsorption device for additional safety in case ofhavary. Using absorption device depends on chillerinstallation conditions and has to be checked regardingvalid rules for each application field.

The DX chillers are delivered with a dry nitrogen charge(0.2 bar g.p.).

Refrigerant and special refrigeration oil are included inscope of supply.

A user manual with description of refrigeration circuit,and instructions for commissioning, operating andmaintenance are belonging to each DX chiller supply.

For detailed informations regarding screw compressorssee separate product informations.


SERIES - OVERVIEW

AMMONIA LIQUID CHILLERDX SERIES RR, LR, VR

20.06.2000/ 7 633118E.DOC - 1/3

Basis forchiller series :

Grasso screw compressor series with 12 model types

SC - SH series SC - MC series SC - LT series

Grasso screwcompressor (SC)

: 4 types : C, D, E, GVth= 231 ... 375 m³/h

4 types : H, L, M,NVth= 450 ... 690 m³/h

4 types : P, R, S, VVth= 805 ... 1640 m³/h

Chiller design : DX

Chiller series : RR LR VR

Working principle : Dry evaporation with ammonia

Condenser type : water cooled shell and tubeheat exchanger

air cooled condenser evaporative condenser

R L V

R R R

Evaporator type : shell and tube heat exchanger shell and tube heat exchanger shell and tube heat exchanger


SERIES - OVERVIEW


633118E.DOC - 2/3 20.06.2000/ 7

The DX chiller series consists of 12 model types withestablished Grasso screw compressors.

The capacity range covers from 200 kW up to 1600 kWregarding air conditioning application formanufacturing cold water.

The only used refrigerant is ammonia.

The working principle is the dry evaporation with shelland tube heat exchangers as evaporator andcondenser.

The DX chiller series requires low refrigerant chargingquantities. So it guarantees highest safety andenvironmental standards.

The standard RR Chiller is complete factory-assembled,with electric and tube lines and a l.v. switching station.

The standard LR and VR Chillers are complete deliveredas a combination of drive-line and evaporator. Thecondenser has to be connected on site.

Chiller Compressor Chiller capacity *) kW

Motor nom. capacitykW

Dimensions L, B, Hmm

Weight shipp./operat.kg

RR 200 C 191 55 3500, 1280, 1820 2538 / 2781

RR 250 D 227 75 3500, 1280, 1820 2719 / 2981

RR 300 E 272 75 3500, 1280, 1820 3043 / 3359

RR 350 G 322 90 3500, 1280, 1820 3272 / 3617

RR 450 H 411 110 3800, 1400, 2000 3661 / 4094

RR 500 L 485 132 3800, 1400, 2000 4086 / 4569

RR 600 M 615 160 4000, 1400, 2100 4985 / 5521

RR 750 P 748 200 4000, 1500, 2000 5889 / 6569

RR 800 N 798 200 4000, 1400, 2100 5500 / 6154

RR 1000 R 966 250 4100, 1860, 2250 6998 / 7887

RR 1200 S 1198 315 4100, 1860, 2250 7769 / 8833

RR 1600 V 1547 355 4100, 1860, 2350 9789 / 11464

*) water outlet evaporator 6°C, water outlet condenser 32°C


SERIES - OVERVIEW


20.06.2000/ 7 633118E.DOC - 3/3





LR 200 C 187 75 3500, 1300, 1820 2300 / 2550

LR 250 D 221 75 3500, 1300, 1820 2500 / 2770

LR 300 E 265 90 3500, 1300, 1820 2800 / 3120

LR 350 G 314 110 3500, 1300, 1820 3050 / 3395

LR 450 H 402 132 3800, 1450, 2000 3200 / 3640

LR 500 L 474 160 3800, 1450, 2000 3600 / 4100

LR 600 M 601 200 3800, 1450, 2000 4300 / 4840

LR 750 P 731 250 4000, 1450, 2100 5300 / 5980

LR 800 N 787 250 2800, 1450, 2000 5000 / 5660

LR 1000 R 945 315 4100, 1450, 2250 6100 / 6890

LR 1200 S 1171 355 4100, 1450, 2250 6800 / 7870

LR 1600 V 1506 450 4100, 1450, 2250 8100 / 9780

*) water outlet evaporator 6°C, condensing temperature 50°C





VR 200 C 191 55 3500, 1300, 1820 2300 / 2550

VR 250 D 227 75 3500, 1300, 1820 2500 / 2770

VR 300 E 272 75 3500, 1300, 1820 2800 / 3120

VR 350 G 322 90 3500, 1300, 1820 3050 / 3395

VR 450 H 411 110 3800, 1450, 2000 3200 / 3640

VR 500 L 485 132 3800, 1450, 2000 3600 / 4100

VR 600 M 615 160 3800, 1450, 2000 4300 / 4840

VR 750 P 748 200 4000, 1450, 2100 5300 / 5980

VR 800 N 798 200 2800, 1450, 2000 5000 / 5660

VR 1000 R 966 250 4100, 1450, 2250 6100 / 6890

VR 1200 S 1198 315 4100, 1450, 2250 6800 / 7870

VR 1600 V 1547 355 4100, 1450, 2250 8100 / 9780

*) water outlet evaporator 6°C, condensing temperature 32°C

GrassoRefrigeration Division

PRODUCT DESCRIPTION

AMMONIA LIQUID CHILLERSERIES DX - DRY EVAPORATION

00.10 634212e.doc- 1/1

DESCRIPTION

DX R R 800 S NH3

Series Dry Evaporation

Condenser Type P — Plate Heat Exchanger

Evaporator Type R — Shell and Tube Type Heat Exchanger

Nominal Chiller Capacity (kW)related to cold water operation

Chiller Design type:without marking : Standard design

Refrigerant

L — Air Cooled CondenserV — Evaporative Condenser

S : Special design related to heatexchangers and optional equipment


DESCRIPTION OF DESIGN AND FUNCTION


00.10/2 636271e.doc- 1/9

INTRODUCTION

Ammonia liquid chillers for dry evaporation (DX)consists of the following main components:

1. Drive-line (screw compressor, driving motor, oilseparator)

2. Evaporator with basic frame, carrying the drive-line3. Condenser, alternative

• built on shell and tube type

• external evaporative condenser or air cooledcondenser

4. Low voltage system with control device.Ammonia liquid chiller can be delivered in version RRfor complete capacity range of model types 200 - 1600as standard ready for connecting, complete with pipesand wiring.

The complete combination of drive line and evaporatorcan be delivered for versions LR and VR, so that thecondenser only have to connect on site.

MODE OF OPERATION

Compressor sucks refrigerant gas out of evaporator andbrought up to condensation pressure.

The refrigerant turns to liquid as it is cooled and easeabout a solenoid valve directly into the evaporator. Thesolenoid valve is controlled by suction gas overheat.

The refrigerant evaporates by taking up heat (deliveredby secondary refrigerant).

Oil is injected into the working chamber during screwcompressor operation. Oil and refrigerant are separatedagain via the oil sparator on discharge side. The oil incompressor heated is either cooled via a oil cooler toinlet temperature or liquid refrigerant is injected intothe screw compressor for reaching a dischargetemperature, which is agree with the permissible oiltemperature.

The oil passes through oil filter before it returns to thecompressor.

In spite of high effective oil separation system oilreaches the chiller low pressure side. A special, byGrasso GmbH Refrigeration Technology used refrigerantsoluble oil, makes the oil able to flowing so that it canbe sucked from screw compressor again. This is thebasis for a failure-free operation of evaporating system.

The screw compressors are fitted with continouscapacity control by volume flow control (internalbypass) with a range of 15% - 100%.

SHELL AND TUBE EVAPORATOR

• one- or double-circuit design, as a water-(glycol)-cooler with plain tubes

• in accordance with pressure vessel regulations, validon site of installation

• standard insulation with insulating materialArmaflex

• with ports for draining and venting

CONDENSER TYPE

3 Chiller series are offered. All series are equipped withshell and tube heat exchangers as evaporator. Thecondenser can be a shell and tube heat exchanger(standard), air cooled condenser or evaporativecondenser as required.

DX Chiller with water cooled shell and tube heatexchangers as condenser (RR types) are equipped witha water-cooled oil cooler. The types LR and VR aredesigned with a thermosysphon oil cooler (payattention to altitude differences between chiller andcondenser). The required HP-receiver is built-on thechiller.

Chillers RR series are delivered with condenser. ChillersLR and VR series require general a separate delivery(without condenser). The components are connectedon site (split installation).

CONTROL DEVICE

In the standard design, the ALC are equipped with astandard SIMATIC S5-95U SPC. The SIMATIC guaranteesthe control and safety monitoring for all chillercomponents. A background illumination LCD displayallows reading of all operating and fault messages aswell as process variables. The display is operated via arobust keypad having 6 function and 24 system keys..

LOW VOLTAGE POWER PANEL

The low voltage power panel is completely wired withall chiller sensors and actuators as well as prepared forconnection with the external incoming-feeder cable.




636271e.doc - 2/9 00.10/2

SAFETY DEVICES AGAINST PRESSURE EXCEEDINGS

The chiller is equipped with a safety pressure limiter(TÜV-application) and a pressure transducer, whichprevent exceeding the discharge pressure limitationvalue (demand of UVV VBG 20).

The pressure relief valve prevents pressure exceedinghigher than the permissible limitation value.

Blow-off safety valves are mounted only in that case, ifit is required by specifications valid on site ofinstallation.

REDUCE EFFECTS OF RELEASED AMMONIA

Depending on installation conditions by enforcedventing with ventilators, absorption by insertion into awater vessel or neutralization with suited substances asCO2 or venegar acidity. Grasso GmbH RefrigerationTechnology offers fittings for required precautions.Depending on machine room situation and refrigerantcharging Grasso GmbH Refrigeration Technology offersa series of absorption devices.




00.10/2 636271e.doc- 3/9

OPTINAL EQUPMENT

Pressure gauge kitThe pressure gauge kit in addition to compressorcontrol device consists of 3 pressure gauges for

• suction pressure (evaporator, compressor),

• discharge pressure (compressor, condenser),

• oil pressure.

Dual oil filterA second oil filter can be installed for changing oilfilter during compressor operation.

Connection flanges• Evaporator

- Connection flanges without counter flange arethe standard application for all model types.

- Counter flanges are optional.

• Condenser

- Condensers are without flanges for DX chillermodel types RR250 - RR350 (standardapplication). Flanges are optional.

- Counter flanges are optional.

Hydraulic Adjustment of theInternal volume ratio (Vi)The compressor may have a fixed or a hydraulicallyadjustable internal volume ratio (Vi) depending on itsdesign. A hydraulic Vi-adjusting system guaranteescompression at the lowest loss possible under therespective operating conditions and thus saves drivepower (see the Screw Compressor Datasheet).

The internal volume ratio is variable, depending onthe design and type of the compressor, across arange from Vi = 2.6 to Vi = 5.5.

L2-Bus communication of compressor control deviceAll analogue signals of DX chiller can pass on via theSINEC-L2 interface. The master control has to becontroled with the same software protocol.

One master control can be connect with up to 32chillers.

Installation of the Screw Compressor with Anti-vibration MountsIn this form of installation, the DX chiller is erectedon vibration isolators which are bolted by screws tothe DX chiller but not to the levelled concretefoundation.

Isolator without foundation fixation

The isolators retain their permanent resilience underdesign load. The levelling range is 20 mm. The DXchiller has a firm stand due to its design surfacepressure and the resulting friction coefficientbetween isolator and foundation.




636271e.doc - 4/9 00.10/2

P+I diagram for standard ammonia liquid chiller DX series, type RR 200 — RR 350

010 screw compressor

012 control slide position indicator

015 compressor driving motor

016 motor current limiter

017 motor winding protection

020 oil separator

030 water cooled oil cooler

040 oil pump

050 solenoid valve blockfor capacity control

065 stop valve - oil circuit

075 oil pressure regulating valve

085 stop valve - venting

090 stop valve - oil draining, charging

095 coupling

100 pressure transducer —suction pressure

105 pressure transducer —discharge pressure

110 pressure transducer — oil pressure

115 resistance thermometer -suction temperature

120 resistance thermometer -discharge temperature

125 resistance thermometer —oil temperature

250 check valve — hot gas line

255 stop valve - bypassing (250)

285 stop valve -bypassing integrated check valve

350 safety pressure limiter

360 oil heater

365 stop valve — oil separator oil drain

395 pressure transducer —oil pressure after filter

420 stop valve - draining compr. housing

450, 455 service port

470 stop valve — oil pump suction side

475 stop valve — oil pump discharge side

500 condenser

505 service port

510 expansion valve

520 evaporator

530 resistance thermometer -water flow

535 flow controller

540 refrigerant charging valve

545 stop valve - service

550 solenoid valve — liquid line

560 venting - water side

565 draining - water side

580 stop valve - liquid line

585 stop valve — suction line

590 stop valve — discharge line

595 sight glass - liquid line




00.10/2 636271e.doc- 5/9

P+I diagram for standard ammonia liquid chiller DX series, type LR 200 — LR 350 (VR 200 — VR 350)

10 screw compressor





20 oil separator

40 oil pump




85 stop valve - venting


95 coupling







200 refrigerant cooled oil cooler

205 sight glass — oil cooler

210 stop valve — oil cooler oil drain,refrigerating side





360 oil heater



420 stop valve - draining compr. housing

450, 455 service ports

470 stop valve - oil pump suction side

475 stop valve - oil pump discharge side

500 condenser

505 service port

510 expansion valve

515 safety valve

520 evaporator


535 flow controller


545 service port








600 liquid receiver

605 safety valve - liquid receiver

610 stop valve — pressure relief line





636271e.doc - 6/9 00.10/2


10 screw compressor





20 oil separator

25 oil filter with multi-function block


36 oil filter

40 oil pump





80 control valve — injection oil

85 stop valve — venting suction filter

90 stop valve — oil draining/ charging

95 coupling







135 vent valve — oil circuit

140 check valve — function oil




340 pressure relief valve


360 oil heater



405 stop valve — pressure transducer —suction pressure

460 service port

500 condenser

505 service port

510 expansion valve

520 evaporator

525 service port


535 flow controller


545 service port











00.10/2 636271e.doc- 7/9


10 screw compressor





20 oil separator

25 multi-function block

36 oil filter

40 oil pump






85 stop valve - venting suction filter


95 coupling







135 stop valve — venting oil filter

140 check valve — function oil




215 thermostatic 3-way-valve —oil temperature control

220 stop valve — bypassing oil cooler






360 oil heater



405 stop valve — pressure transducer -suction pressure

460 service port

505 service port

510 expansion valve

515 safety valve

520 evaporator


535 flow controller


545 service port








600 liquid receiver







636271e.doc - 8/9 00.10/2


10 screw compressor





20 oil separator

25 oil filter with multi-function block


36 oil filter

40 oil pump

45 suction filter






90 stop valve — oil draining/ charging

95 coupling







135 vent valve — oil circuit





360 oil heater



405 stop valve — pressure transducer —suction pressure

460 service port

465 service port

500 condenser

505 service port

510 expansion valve

520 evaporator


535 flow controller


545 service port











00.10/2 636271e.doc- 9/9


10 screw compressor





20 oil separator

25 multi-function block

36 oil filter

40 oil pump

45 suction filter







95 coupling







135 stop valve — venting oil filter




215 thermostatic 3-way-valve —oil temperature control

220 stop valve — bypassing oil cooler





360 oil heater



405 stop valve — pressure transducer -suction pressure

460 service port

465 service port

505 service port

510 expansion valve

515 safety valve

520 evaporator


535 flow controller


545 service port








600 liquid receiver





POWER PARAMETERS


00.10/ 0 DX Chiller types RR 634211E.DOC - 1/1

Chiller Type RR 200

Refrigerating capacity (kW)Drive capacity (kW)

Secondary refrigerant outlet temperature at evaporator (°C)

10 6 2 0 -2 -6 -10

Cooling medium 32 22247

19146

16345

15144

13943

11742

9841

outlet temperature 38 21354

18352

15651

14450

13350

11248

9347

at condenser (°C) 45 20858

17856

15255

14054

12954

10853

9051

Chiller Type RR 250



10 6 2 0 -2 -6 -10


22754

19353

17852

16452

13950

11649


21762

18560

17159

15758

13257

11156


21167

18065

16664

15264

12863

10761

Chiller Type RR 300



10 6 2 0 -2 -6 -10


27264

23263

21461

19760

16659

13957


26173

22270

20668

18869

15967

13366


25378

21676

19976

18375

15473

12872

Chiller Type RR 350



10 6 2 0 -2 -6 -10


32275

27574

25373

23372

19670

16568


30886

26383

24381

22381

18880

15778


30093

25690

23588

21688

18287

15285

standard dimensions


POWER PARAMETERS


00.10/ 0 DX Chiller types RR 634217E.DOC - 1

Chiller Type RR 450



10 6 2 0 -2 -6 -10


41191

35190

32488

29887

25184

21183


395104

337101

310100

28599

24096

20195


383113

327110

301109

277108

233106

194103

Chiller Type RR 500



10 6 2 0 -2 -6 -10


485108

414106

382104

351103

296100

24897


465123

397119

366118

336116

283114

237112


452133

385130

355128

326127

274125

229121

Chiller Type RR 600



10 6 2 0 -2 -6 -10


615136

525134

484132

445130

376126

315123


591156

503151

464149

426147

359144

300141


574169

488164

450162

413161

348158

290154

Chiller Type RR 800



10 6 2 0 -2 -6 -10


798177

681173

630170

581167

493163

415159


768201

659195

608192

561190

475185

400182


754218

643212

594209

548207

463203

389196

standard dimensions


POWER PARAMETERS


00.10/ 0 DX Chiller types RR 634218E.DOC - 1

Chiller Type RR 750



10 6 2 0 -2 -6 -10


748161

654159

606157

560154

476149

401145


739186

635180

588177

543174

461170

388165


724201

622195

576192

532190

451185

380178

Chiller Type RR 1000



10 6 2 0 -2 -6 -10


966211

845206

782203

723199

614192

518187


954241

821232

760228

701225

595219

502214


936260

804252

744249

687245

583239

490230




10 6 2 0 -2 -6 -10


1198262

1048256

970251

896247

762238

643232


1183298

1018288

942283

870279

738271

622265


1160322

997313

922308

852304

722297

608285




10 6 2 0 -2 -6 -10


1547320

1356320

1256314

1162308

988298

834290


1524373

1313360

1216354

1124349

955340

805331


1492402

1285390

1189385

1099380

933371

786362

standard dimensions


MAIN DIMENSIONSWEIGHTS AND CHARGING QUANTITIES

AMMONIA LIQUID CHILLERDRY EVAPORATION - TYPES RR 200...350

00.10 DX Chiller type RR 634214E.DOC - 1

cold water

outlet

option cold waterinlet

inlet

cooling water

cooling water

inlet

outlet

Dimensions and Weightsfor standard conditions water outlet evaporator 6°C, water outlet condenser 32°C

Chiller Type Length (mm) Width (mm) Height (mm) Weight (kg)

without charge with charge

RR 200 3500 1280 1820 2538 2781

RR 250 3500 1280 1820 2719 2981

RR 300 3500 1280 1820 3043 3359

RR 350 3500 1280 1820 3272 3617

Charging quantities

Chiller Type Oil charge Refriger. charge Standard connection NB

(dm³) (kg) cold water cooling water

RR 200 90 13 100 without flanges 80 without flanges

RR 250 90 17 100 without flanges 80 without flanges

RR 300 90 20 100 80 without flanges

RR 350 90 23 100 80 without flanges



AMMONIA LIQUID CHILLERDRY EVAPORATION - TYPES RR 450 ... 800


cold water outlet option cold water inlet

cooling wateroutlet

cooling waterinlet




RR 450 3800 1400 2000 3661 4094

RR 500 3800 1400 2000 4086 4569

RR 600 4000 1400 2100 4985 5521

RR 800 4000 1400 2100 5500 6154

Charging quantities



RR 450 110 30 100 125

RR 500 110 33 125 125

RR 600 110 40 125 125

RR 800 110 53 150 150



AMMONIA LIQUID CHILLERDRY EVAPORATION - TYPES RR 750 ... 1600


cooling water




RR 750 4000 1500 2000 5889 6569

RR 1000 4100 1860 2250 6998 7887

RR 1200 4100 1860 2250 7769 8833

RR 1600 4100 1860 2350 9789 11464

Charging quantities



RR 750 150 50 150 150

RR 1000 150 66 150 200

RR 1200 150 79 200 200

RR 1600 150 100 200 200


MODULAR CONTROL DEVICEGRASSO SCREW CONTROL (GSC)

00.07 636288e.doc- 1/2

MODULAR CONTROL

Type Grasso Screw Control (GSC)

General Programmed control, that is adapted to specific requirements of Packages and Chillers.The number of analogue and binary inputs and outputs is adapted the demand byselecting the appropriate components. Programming is carried out using defined andtested software modules that The contents of this documentation and the encloseddrawings, sketches and diagrams are intended only for plant users and operatingpersonnel. They may be neither duplicated nor divulged to third parties or firmswithout written consent.

The technical data, figures, dimensions and weights presented in the documentationmay be more closely defined or otherwise specified as a result of contractualagreement and are binding only after our confirmation in writing. The stipulations setforth in the contract have precedence over those in this documentation.

We reserve all rights to introduce technical modifications in the course of furtherdevelopment.are created and organized by Grasso. Changes in these softwaremodules are not permissible, as a rule.

Package and Chiller control organization:

1. Ensuring unit/chiller safety by monitoring of pressure and temperatures.

2. Running a fail-safe startup and shutdown routine.

3. Screw compressor capacity control, either manually or automatically.

4. Automatic refrigerant injection into the evaporator (for chillers DX Series only).

Specifications Model type: Standard housing with an engineered modular Grasso configurationand a standard terminal.

Power supply: 115/ 230 V AC, 50/ 60 Hz

Control anddisplay unit:

Controls are installed in the door of the housing and labelled. Theterminal has a 4-line text display. All analogue process data aredisplayed at the terminal.Texts can be displayed in various languages.

Parameterization: Process parameters are parameterized, after having entered apassword, from the controls at the terminal to adapt the controller tothe process.

Behaviour afterpower return: Return to the state prior to power failure.

Elapsed-time meter: Available software function.

Analog inputs All process variables are processed in analogue mode.Sensor inputs are designed for standadized input signal (4 — 20) mA.

Digital inputs Suitable for 24 V DC.

Analog outputs Control slide position as non-floating signal (4 — 20) mA.

Digital outputs Floating contacts for signal transfer to L. V. Switching Station and Master Control. Allsolenoid valves are designed for 24 V DC.

Application No maritime or airborne applications (maritime application on request).


MODULAR CONTROL DEVICEGRASSO SCREW CONTROL (GSC)

636288e.doc - 2/2 00.07

Controlled variable process temperature in °C (Standard — evaporating temperature or temperature ofsecondary refrigerant). Controlled by a three-position controller. Set point andneutral zone can be parameterized.

Set point adjustment Setpoints can be adjusted through the unit controller by a higher-level master controlusing analog signal (4 — 20) mA.

Start-up modes MANUAL SC unit/ chiller is switched ON / OFF manually, independently of therefrigerating demand.

AUTO SC unit/ chiller is switched ON / OFF automatically depending on localrefrigerating demand.

Operating modes MANUAL Manual key-operated capacity control(the control slide is shifted manually).

AUTO Automatic setpoint-dependent capacity control(the control slide is shifted automatically).

Control modes LOCAL SC unit/ chiller can be operate independently (no master control).

CENTRAL SC unit/ chiller is controlled by master control only.

Fault massages Each fault is displayed as an on-line message and stored in a histogram buffer.A fault log printer can be connected.

Sequential control Simple sequential routine can be achieved by using a master control via floatingcontacts.

Communication with a higher level control (master control)

All status messages and all analogue data sent to a higher-level master control via aMPI interface (standard) or via a PROFIBUS-DP (Master-Slave) interface (optionally).

viaBUS-coupling

Up to 32 SCP/ chiller controls can be connected to a higher-level master control usingthis method.

The master control must know the MPI or PROFIBUS-DP Master-Slave protocol.

viafloating contacts

To higher-level control: Status messages Chiller/ SCP readyChiller/ SCP fault.

The control slide position may be passed on as ananalogue signal using a buffer amplifier.

From higher-level control: Status messages Chiller/ SCP ON/ OFFFault acknowledgementIncrease/ reduce SC capacity.

Bus coupling MPI (standard) or PROFIBUS-DP Master-Slave (optionally)

Documentation Hardware descriptions German, English, French

Circuit diagrams German (acc. to DIN), English

User manual German, English


ABSORBER

AMMONIA LIQUID CHILLER

00.10 Chiller Data Sheet 060 920E - 1

1. GENERAL

The operation of ammonia liquid chillers in refrigeratingplants is subject to venting the machine room inaccordance with the Regulations on the Prevention ofAccidents (VBG 20), § 12 and § 17.

In case of leakage the machine room air must bebleeded into the atmosphere in a manner that causesno hazards. Should this not be possible, the machineroom air is to be passed through an absorber forcleaning purposes and then returned to the machineroom. To meet this requirement, a series of differentammonia absorber sizes has been developed inaccordance with the amount of refrigerant contained inthe ammonia liquid chillers and refrigerating plants.

If several liquid chillers are used, the absorber requiredfor the liquid chiller with the greatest refrigerant chargeis chosen. A combination of several absorbers is possiblewhen the refrigerant charge of all liquid chillerstogether exceeds the indicated maximum of thatabsorber.

The absorbers are designed for integration in commonventing systems.

2. DESCRIPTION OF FUNCTION

The high-pressure ventilator is put into operation by anammonia warning device if the maximum permissibleammonia concentration of 50 ppm is exceeded. It sucksthe air-ammonia mixture off and forces it into theplastic vessel which is filled with water. The amount ofwater in the plastic vessel is sufficient to absorb thetotal refrigerant charge, with the decrease in solubilityby warming-up being taken into account. After leavingthe gas distribution pipe the air bubbles through thewater, and the ammonia is absorbed. The cleaned air isrecirculated to the machine room. If the ammoniaconcentration falls below the threshold value, theventilator is switched off.

After the operation of the absorber due to an increasedammonia concentration in the machine room, thecontaminated water must be disposed off in aworkmanlike manner.

If the absorber is not operating over a longer period,exchange the water every three months to preventrotting. This occasion may be utilized to check the plantand clean the gas distrubtion pipe, if required.

Due to the design of the gas distribution pipe it is notrecommended to add chemicals to the water charge toneutralize the ammonia.

3. INSTALLATION

The absorber is placed on an even support. Particularmeasures other than the selection of a frost-freelocation are not required. The charging connection(unpressurized) may be integrated in an existing watersystem. The electrical installation of the high-pressureventilator and ammonia warning device shall beperformed according to the technical specification insuch a way that its function is ensured even when themain switch of the refrigerating plant is off. Theintegration into venting systems should take placeaccording to the local conditions and requirements. Ifdesired, the bleed line of the refrigerating plant may beconnected to the absorber.

4. MAIN DIMENSIONS

Type L B H

ABSA 50/IABSA 100/IABSA 150/IIABSA 200/IIABSA 250/IIIABSA 300/IVABSA 350/IVABSA 25/V

ca. 1400ca. 1400ca. 2200ca. 2200ca. 2200ca. 2700ca. 2700ca. 1200




ABSORBER



5. CONSTRUCTION

5.1. Positioning

The absorber is positioned as shown in the Figure.

Item Designation

1 Vessel made of ammonia-resistant plastic

2 High-pressure ventilator

3 Connecting sleeve

4 Demister with separating package

5 Diffuser laid out for connection to ventingsystems

6 Gas distribution pipe

7 Liquid level indicator

5.2. Table of connecting sleeves

I Suction connection ofhigh-pressure ventilator

∅ 76; ∅ 103; ∅ 140;∅ 160*

II Diffuser air outlet ∅ 160

III Safety pipe connection NB 40

IV Charging connection NB 32**

V Discharging connection NB 32**

VI Sampling connection NB 10**

* according to type of ventilator made by Elektror** ball-cock design


ABSORBER



6. TECHNICAL DATA - ABSORBER RANGE

Type Weight withNH3-filling*

Vessel type anddimensions

L/W/H

required water quantity

Filling height requiredair flow

Ventilator typemanufacturer

Elektror

Driving-motor

capacity **

Gas distributionpipe ∅ x l

Weight(withoutfilling)

[kg] [mm] [litre] [mm] [m³/h] [kW] [mm] [kg]

ABSA 50/ I up to 50I

1200/ 1000/ 1000 420 350 680 HRD 14/5 2,2 110x500 200

ABSA 100/ I up to 100I

1200/ 1000/ 1000 840 700 1080 HRD 60/4 4,0 110x750 230

ABSA 150/ II up to 150II

2000/ 1200/ 1000 1260 525 1410 HRD 65/4 4,0 137x750 350

ABSA 200/ II up to 200II

2000/ 1200/ 1000 1680 700 1710 HRD 65/5 5,3 137x750 360

ABSA 250/ III up to 250III

2000/ 1500/ 1200 2100 700 1985 HRD 65/7 7,5 137x750 440

ABSA 300/ IV up to 300IV

2500/ 1500/ 1200 2500 670 2240 HRD 65/7 7,5 137x750 510

ABSA 350/ IV up to 350IV/I

2500/ 1500/ 1200 2920 780 2485 HRD 65/7 7,5 137x1000 510

ABSA 25/ V up to 25V

1000/ 600/ 750 210 350 430 HRD 1/5 1,1 70x500 130

* The described data refer to respective extremely NH3-filling weight of refrigerating plant / of liquid chiller** Electric motors 230/ 400V, 3~, 50 Hz, other applications on inquiry.

Date post:	22-Jan-2021
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