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Grasso GRASSOSCREW GSL Series Instruction Manual

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Summary of Contents for Grasso GRASSOSCREW GSL Series

  • Page 2 Nl-1:3 68 to 1 R22, Grasso Products assumes no responsibility for the qualfty. IMPORTANT performance, availability or viscosity of the products in table 2.1 below. Used or fi l tered 011 shou/d never be added toa refrigeration screw compresso r unde r any cir c umstances.
  • Page 3 GRBSSÊÏ TABLE OF CONTENT$ (Il "°''"HC:.V�IWT/IIETRIE-1.lll\JH(; ,�,_ ..-I.IO rnotJTPlUCN)N See page: SUBJECT 1. INTROOUCTION 2. OESCRIPTION AND PRINCIPLE OF OPERATION OF THE GRASSOSCREW COMPRESSOR GSL Genera! 22 Prinaple of ooeration 2.3 Built-in volume ratio ano pressure ratJo 7..4 Construction the compressor 2.5 Rotary shaft seal 2.6 Capac,ty control system...
  • Page 4 SUBJECT See page: 7. SERVICING 7 .1 lntroduction 7.2, Genera! recommendations 7 .3 Shutdown procedure 7.4 Bolt tightening torques 7. 1 7 .5 Shaft seal replacement 7 .6 Capacity control electric valve actuator seNicing 7.7 Capacity control shaft seal seNicing 7 .8 Capacity con trol pilot valve assembfy 7 .9 Rotor end play inspection 7 .1 O Thrust bearing inspection...
  • Page 5 GRBSSi:ï 1. INTRODUCTION REAO THE INSTRUCTION MANUAL CAREFULL Y PRIOR TO INSTALLATION AND COMMISSIONING OF THE GRASSO­ SCREW REFRIGERATING COMPRESSOR PACKAGE This instruction manual is intended as a guide for the installation conlractor as wen as tor trained personnel of the end...
  • Page 6 GRaSSi:i 2. DESCRIPTION AND PRINCIPLE OF OPERA TION OF THE GRASSOSCREW COMPRESSOR GSL (�416) times its speed to the femafe rotor. In any verti­ cal cross . secHon both the male and female lobes have 2.1 GENERAL 1r,e latesl non•symmemcal profile GAASSOSCAEW GSL des1gnal1on fora series...
  • Page 7 A ◄ , 7--+ - male rotor 5. ax,al ,nlei por1 femaJe rotor 6. ax,al/radial outlet por1 inner housing 7. suction chamber 4. outer housing 8. discharge chamber 9 dnve end (mal? rotor) FIG. 2.1 BASIC CONCEPT top view of fig. 2.1 �...
  • Page 9 w w w . G T E X . n l...
  • Page 10 GRaSSÊï -. ua Nl'IICi�Alt r�nNt,.._ftlJK wc� 1111 • "' ..,, ,..,. D"DCS111-noM 1 IOO< r;u; 2 erve Il r 3. 011 ove.rliow t1ole 4. shaft seaJ cage S snahsea 11ous1ng 6 0<.' t ,et ,ou,,,nç 7 011 St;pp,� port 8 O-nr.g ...-:---1--7 shah.sea1 cover...
  • Page 11 1. outline oi electric slide valve acwator 2. balt screw seal holder 3. pilot valve disc 4. pilot valve pin (sPQOI valve) 5. ball screw 6. sllde vatve rod 7. hydrautic cylmder 8. channel between lnboard chamber ai,d suction ohamber 9.
  • Page 12 GRBSSï::i 2.7 Oll SUPPLY FOR INJECTION AND LUBRICATION extremely important that 1nterme- s tung Il 1s male and female rotor lobes effectively seal off eacti 01her mu1ual Moreover, without grving rise to wear_ the 1nev1table gap along the rotor c1rcumference between successive grooves must be thoroughly...
  • Page 14 GRBSSÊi BéOIENl'ltCSIIQCRiD(RFTJIIETRIEffliNC INSlRUCTIlil.HUAL.MAkUl.0"'1NStR 2.8 REVIEW OF" COMPRESSOR CONNECTIONS SUCTION - - , DISCHARGE Xl5 X14 X10 compressor type GSL 65 SUCTION compressor types GSL 85/125 X-18 OlSCHARGE ..� compressor types GSL 85 to 240 com pr essor types GSL 165118(1/240 DISCHARGE TEMPERATURE X10 OIL TO CAPACITY CONTROL SLIDE VALVE POSITIONING X2 DISCHARGE PRESSURE...
  • Page 15 2.9 TECHNICAL DATA AND LIMITS OF OPERATlON GSL240 GSL480 COMPRESSOR TYPE GSL180 GSL65 GSL85 GSL125 GSL165 Built-in numberin type designation volume ratio numerical value ( • ) 2.2 / 2.6 / 3.7 / 4.8 2.8 / 3.4 / 5.417.6 Built-in pressure ratio ( - ) 2.6 / 3.1 / 4.8 / 6.6 Outer male and female rotor diameter (mm) 1.70...
  • Page 16 GRHSSï:i 3. DESCRIPTION AND OPERATION OF THE COMPRESSOR PACKAGE 8EllENINSVOOflSOtAl'T'9ETRIE9SAH�ITUNt: t� IWOI.W..4Ul lnlC$TRUCT 3.1 PRINCIPLE OF OPERATION OF TME COMPRESSOR 3.2 DESIGN DETAILS OF THE COMPRESSOR PACKAGE PACKAGE The detailed lay-out and flow diagram oi the standard com­ Since � orrect operation of the compressor largely depends pressor package is shown in figures 3.2 to 3.
  • Page 18 ,ssoscrew comprossor GSL • r -, elecltkl motor dr.v� --r-r r 7-� • 3. lle•lbtea,up,ng 00Jpl' I ngguod e!ec1r1c slldevalvo ACJu1,11or (EVA) OJ0 IIl"0 (µ (f) © Ba98 !mmo . .. pnmary oil separo1or api1ng \:ladm pressu1� saieiy v&1v11 oll 1ev� s•oh g ass �, �...
  • Page 19 w w w . G T E X . n l...
  • Page 20 clssoscrew compressor GSL !" 2. 11'eclrtc drilrE 111<>tor • Hex,ble oouJjlng 4. covpl1ng guarrl � otectrlc slidevnlve actuator ([VA) 001IJ0@0© r��rt��� r>l 811,nfiame 7. p11u·,uy 0:1 s•porotor 8, sprfr \ (I IOaded prossure saloiy valve 9. olllov11I slgh ota,A 1 11vnr 1 O oll ,,u11I r,g &lJ 011 prn�s1.,1e tOOlll&lor...
  • Page 21 "O 1 _ GrassoscreN compressor GSL 2_ ele ctric drivi motor 3. flexiblecoupll ng én 4. coupJing guard p � (EVA) IIl@ IIl-0 0 0 © 5. e lectric slid� valve actuator p)(p)(p)ttf 6_ Bc1se frame 7. primary oil �parator spring-loadtld pressu/e safety valve 9, oil level slgrl glass 10.
  • Page 22 GRBSSï:ï QECEeHC.SVOORS<>lRIFTISElRIEBSANUl'llfflÇ INS1'RUCT 11.UfLW.MANI.L D1NSTRUCTI - Depending on the operating condi1ions (so, not always): The necessary stop vaJves (13). check valves {22) and a solenoid valve controlled, servo-operated (by gas press­ small si2ed valves (12) îsolating, charging or draJning ure) by-pass valve (31), mounted in a by-pass line the compressor package or parts of it.
  • Page 25 outpu� shaft potentiometer (optional) terminal strip actuator wiring extemal 1-/---'==.ir-i+--, ot potentîometer wiring � - ---t-1 001-- - -------, terminal strip of electric motor and 2 0 @1----- micro switches nr==r,=î:S:;��ITTITT --+++--,-ii:-+--extra micro switch a =min.limit switch and cam (optional) b = max.
  • Page 26 GRBSSï:ï BEDIE"HGSVOOASO<IIFTll!ETRIEBSAHl.EfTIJNC IIISTRUC' YANUAlAWILEL OUCSlRUCOON PRESSURE GAUGE AND SAFETY SWITCH ARRANGEMENT IN INSTRUMENT CABINET OF THE GSLP - PACKAGE ECONOMIZER SUCTION DISCHAAGE PRESSURE PRESSURE PRESSURE PRESSURE /" ✓-;- -- · , \ / /�\ ///""'-\ " __./ A=RT6AB A= RT68 B=RT1A B=RT1 C =RT1A...
  • Page 27 gauges. In case a control cabinet has been delivered With cate the actual discharge temperature; by pressing a but­ the package as wel!, the temperature safety switches, all ton on the front side of the read-out the set value of the temperature measuring devices and capacity indicator are safety switch will be shoWn.
  • Page 28 .." -rs -� � --, 1 - , � o----- .q___ l kllA)u ""' ... ) S IO� KllA / K2H " M\ §- KIM� " M\ lfl-. � s • [ fö K14A � Jl. 1 4 KISA ··:ï...
  • Page 29 s2,1 (EKC 30 - 31) cxfü'{"",J.WoR s,a X - cotY'I� ot taml'\al �p ln11do 001.-d Qbi-lut V - ocr"l� of tarmr"I� A"!p nsct" ca�ty coolfol $1ide; valve �duato" hcusn.9 FIG. 3.10 TERMINAL STRIP INSIDE CONTROL CABINET Ll,<2Jt.3, CO�RESSOR SUPPLY CONTRO.. OAIVE MOTOR .:.-.., ..
  • Page 30 GRBSSa 8,EDIE"NBCSV OORSOi R'I-T4ETRIEBS&HlJ!ff\JNG IIISlRUCIIANl.\WIIMll.lfËLJ;n� Oonsequently refay K17 A {line 17) is energized and ils con­ circuit is tormed. This current circuit enabfes to open con• tact K17 A in line 13 cfoses. taci K2T in line 7 approx. 30 seconds after time lag relay By pressing stop/reset button S10, relay Kt0A (line 1) is en­...
  • Page 32 fig. 4.1) consists of two flanges (1 and 7), two stainless dimensional drawing supplied with each package. For stan� steel plate packs (3) and a spacer (6). The steel pack is an dard packages, the location of connections is given in fig. integral assembly consisting of individual plates and bush­...
  • Page 33 GRHSSa IIE!lEMNG$!1QOIISOIRIFTIIIEmlEII.EITIINO 11,smuc:tioN l&AIIIWAIAHI.L o,� - Have available the following (measuring) tools; PRELIMINAAY ALJGNMENT - clean feeler gauges trom 0.025 mm to 0.5 mm 7) Definitely place the motor onto the base frame and - two dlal indicators with attachments and indicator jig (see securely align the coupling so as described hereaf!er fig.
  • Page 34 e) When making shim changes, use a small number q) The angularity in plan misalignment (motor displaced thick shims rather than a large number of thin shims clockw1se or counterclockwise in relation to the com­ to prevent excessive compression of the shim packs pressor) can be checked with the procedure for angu­...
  • Page 35 GRBSSa IIEIE"NCSV00RS04RF/IIETAIEl.ElT'IJtOC INS'TFcUC..,.�� - temperature sensor of capacity controller (48 - 49) g) Open the blowdown valve. � pressure sensor of capacity controller (50 - 51) h) Start the vacuum pump and evacuate the system to BEWARE� Connection X50 == exclusiveJy for DC+ bar(a).
  • Page 36 cilltate a smooth start-up. With power to the motor off, The simplest and most reliable method of checking the elec­ trical s y stem is to teed the power supply to the control panel power supplied to the panel and the oil temperature below ·c verify that the oil heater on by checking the current...
  • Page 39 2) Restarting the compressor in a plant already oper­ covered in this chapter will be pertormed at start-up under ational. the supervision of a Grasso Refrigeration Representative. In the case of rnanually controlled pJanls, proceed in ac­ IMPORTIWT cordance with the fnstructions given in the contractors plant manual.
  • Page 41 GRaSSÊï 6. INSPECTION AND MAINTENANCE OF THE COMPRESSOR PACKAGE BEOEIIHCSVOOIIRIFT-SSAkLElT\IMC lNSTRUC1 IIANU4J.JIUNUEJ...D'INSlRUC110N 6.1 GENERAL 6.3 DAIL Y OPERATION Although the maintenance tor your Grassoscrew com­ After a routine start has been made, observe 1he instru­ pressor is minimal, it must be carried out tor compressor ments and be sure the gauges indicate the correct reading long life.
  • Page 42 While the compressor is running each sight glass contains failure can result in an expensive repair_ lt is especially im­ foaming oil and small vapor bubbles. When clear vapor ap­ portant 10 regularly check the low oil pressure protective cir­ pears in the top sight glass the oir level may be low.
  • Page 43 GRBSSï:i BEOIENIIIGSV00A5CHAI� �--I.EL0'1NS'TR)CT HOURS OF OPERATION 1 ) MAINTENANCE TASK 7500 ETC. 5000 2500 0-50 C'reaning of oiî pump ïïlter and/or renewaJ of main oil filter (see par. Cleaning of suction gas strainer (see par. 6.11) Oil change 2 ) lnspeçlion and, if required, replacement of filter element in secondary alter 3 years oil separator 3 )
  • Page 44 f) lnsert a new filter element, refit the retaining plate and d) Clean the element With a light solvent Then thorough­ tasten the loek nut. ly dry the element preferably with an air blast. g) Refit the filter cover. Mind the condition of the sealing e) Check the gauze for damage.
  • Page 46 CAUSE REMEDY FAULT C) Low · oll pressure (continued) 5. Check capacity con trol cam settings 5. In minimum position, discharge pressure too and actuator motor shaft returns. low for oil circulation Readjust 6. Stop liquid carryover. 6. Uquid refrigerant in oîl Check oil heater.
  • Page 47 &Rassa BEDIE"NCSYOORSa<RIF1'9ITIIIUSl.El1Ul40 INS'TRIJC�lELP'1NSlJIUe' REMEDY FAULT CAUSE J) Capacity control not operatfng 1. Adjust per para. 6.12 1. Capacity con trol actuator out of adjustmen1 2. Circuit breaker detective 2. Replace 3. Actuator motor detective 3. Replace 4. Reset per para. 6.12 and tlghten set 4.
  • Page 48 For assistance with any detail of service or serv,cîng of an item not covered by this manual, please consult Grasso. 7 .4 BOLT TIGHTENING TORQUES The tighteoing torques tor servicing the vanovs beits and 7.2 GENERAL RECOMMENDATIONS...
  • Page 49 c) Disconnect oil supply line and drain line from the shaft Wipe off any foreign mate­ e) Clean all parts thoroughly. seal cover. rial and use a light solvent to old carbon de­ remove posits. Check all parts for burrs and break any sharp d) Loosen eventy the balts from the shaft seal cover_ edges which are found.
  • Page 50 ---- GRBSSa BEllENNC>SVDOfCSOtAarnaEBSAHlEmJNc: d) Mount the seal housing making sure that the overflow 7.6 CAPACITY CONTROL ELECTRIC VALVE hole (3) is pointing upwards. ACTUATOR SERVICING {refer to figure 7 .2) e) lnspect the new stationary seal cover (9) for any The actuator is constructed wîth an adequately greased surface împerfectîons and oil the surface with clean gear case section, this lubricant need .never be changed.
  • Page 52 o, t11 e va lve \oo se tro m tn e pis ­ ki W Ith the va lve plr ue an d ptl ol suct io n sto p va \ve an d dis cha rge s1o p val ba ll sc re w co mp let e /) '1pe n 1he to n.
  • Page 53 cl) lnstall a new 0-rîng (26), piston rod shim (25) and re­ g) Mount the electric va!ve actuator using care to align tairnng ring (24). \he pin in the coupling w,th the slot ,n the end of tho ba// screw shaft. Mount the (;]j piston...
  • Page 55 Contact Grasso if at all in doubt about the condition of the thrust bearings. d) Inspeel the capacity control valve guides as in para­...

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