Grasso GRASSOSCREW GSL Series Instruction Manual Download Page 4

Page: 4 / 57

SUBJECT

7. SERVICING

7 .1 lntroduction

7.2,

Genera! recommendations

7 .3 Shutdown procedure

7.4 Bolt tightening torques

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

7.11 Capacity control valve guides inspection

Compressor Package GSLP

See page:

7.1

7.3

7.4

7.5

7.6

7.7

7.9

92.01

Summary of Contents for GRASSOSCREW GSL Series

Page 1: ...BEDIENINGSVOORSCHRIFT BETRIEBSANLEITUNG INSTRUCTION MANUAL MANUEL D INSTRUCTIONS enass JA1l 92 1TYPE f d _ f 1 QQ 88 232...

Page 2: ...p lla D WF 68 GRBSSa BEDIE HGSVOOrftsQfRIF rllJETRIE8SANLEmJNC INS l RUCnONMANIJALALll E L0 IMS1RUCTIOH The oil must be changed every three months or 2000 hOurs unless their quality is guaranteed by a...

Page 3: ...g the package system p1p1n9 4 7 Mountmg and checkmg coupl ng 4_8 Connecting of power supply and system wirlng 4 9 Pacxage pressure test 4 10 System evacuauon 4 11 ln l1al 011 charge 4 12 lnitial oil w...

Page 4: ...lacement 7 6 Capacity control electric valve actuator seNicing 7 7 Capacity control shaft seal seNicing 7 8 Capacity control pilot valve assembfy 7 9 Rotor end play inspection 7 1 O Thrust bearing ins...

Page 5: ...ecome fam liar with design and operation of the package prior to looking up par1Icular information However in individual cases the design and the construction of the package may difier trom standard i...

Page 6: ...roll and s 1de w1th1n the Ie male rotor flutes thereby Impart1ng a o ating notIor w1th 213 416 times its speed to the femafe rotor In any verti cal cross secHon both the male and female lobes have 1r...

Page 7: ...tor 6 ax al radial outlet por1 3 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 bottom view of fig 2 1 FIG 2 2 PRINC...

Page 8: ...otor shaft gashght to ltie outs1de the compressor is provI eo with a conventlonal type oi rotary shaft seal the design of which however has been adapted to the special cond111ons of high speed and hig...

Page 9: ...ce piston of mare rotor 16 connectlon tor oil supply to balance piston 17 oil lnjeotlon connection to female rotor 18 oil lnfection connection to male rotor 19 female rotor 4 33 19 _ L Jl 201 rr 20 dl...

Page 10: ...UNlON ____ zonlal bere in the p ston As the pilot vafve is moved forwaro 1n the unloadlng d1rec tion the 011 suppty port A radial channel in piston 1s opened by a recess In 1he pin wh1ch allows the oi...

Page 11: ...ace via a very simple and reliable mechanism consisting of a ball nut 12 connected to the disc 11 and bal screw 13 as sembly which is rotated by a small electric motor in a so called slide valve actua...

Page 12: ...such a way as to cover each mare and remale rotor groeve pair for a short penod of ume JUs1 before compress1on commences consequenlly rmmed ately alter the groove pair has been sealed off from the in...

Page 13: ...oil to slide valve pos1t1oning X11 oil to shde valve lubncation X12 oil to male outlet sleeve be aring X13 oil to fernaJe ouUetsleeve bearing X14 oil injectian male rotor X15 oil injec on iernaJe rot...

Page 14: ...N PRESSURE X4 ECONOMIZER MAIN CONNECTION XS ECONOMIZER ADDITIONAL CONNECTION X6 OIL TO FE MALE INLETBEARINGS X7 5TATOR DRAIN XS OIL TO MALE BAL ANCE PISTON X901L TO SHAFT SEAL P NORMAUY PLUGGED X15 co...

Page 15: ...max R22 8 7 6 9 4 2 2 8 NH3 50 min UI R22 58 5 C Evaporaling temperature C CQ NH3 21 5 14 8 1 7 7 1 max Cl R22 2 2 41 15 2 1 4 7 9 Actual suction temperature C min 51 Discharge pressure bar tf max 24...

Page 16: ...flow electr c motor driven oil pump is necessary For this aJtemative oil system wnlch is only applled under certain booster conditions refer to the bottom picture of tig ure 3 1_ 3 2 DESIGN DETAILS O...

Page 17: ...anifold 14 oil pressure regulator p lor controlled 15 oil injection to male rotor1X14 16 oil nject on to female rotor Xl5 17 oil to balance piston of male rotor X8 18 oil to male and temale rotor inle...

Page 18: ...SUI0 tnloty swlrr 11 301 l m n 0I di chtrgo t1 lfmnn11ol pro99um 1nlnr tr 1ch to 11n11 no ony 1 30 1 mln Olll hch rgo d ll 1en1 a1pros 1 1n ntniy Wlloh 101 mnx S1Jr lion press11 o snletyswllch 30J r I...

Page 19: ...etyswitch 301 min suction pressure salety switch 30g min ollldischarge differentlal pressure safetyswlt h lor startingonly 30h min olltdischarge differential pressure safetyswitch 301 max suction ores...

Page 20: ...ucl on po nuresalttlY sv lc h VI 30g mln o lldlsch rga dllleronllnl press11ro r aloly swllch 101 tarting only 3011 11In 01 1 sch ugo d1Here11110J pres u o safotyswitch 301 mnx uc11on pru ure suloty sw...

Page 21: ...sucIionpressure safety switch 30g min oil discnargedilfereotial pressure safety sw tcn fot sIarting onlyl 30h min oil dischargedillerential ptessure safety swilct 30i max suctio rpressure safetyswllch...

Page 22: ...nom zer manifold 50 if present fitted to the stand ard economizer connection s on the compressor housing see also 34 and 35 in figure 2 3 The inlet pipe of this manifold which fs to be connecied to th...

Page 23: ...simple and reliable electric adjusting device called the Electrical slide Valve Actuator EVA is used This is a standard accessory factory mounted on and ln line with the hydraulic cylinder of the com...

Page 24: ...lng shah et the oompressor from the m1nImum lead posIhon of the shde vaJve 1ns1de the compressor corresponding with the zero position of the pointer When the sllde valve 1s at ts maximum lead fully cl...

Page 25: ...malfuncUoning or even breakdown it some where abnormal operating conditions ar se extemal actuator wiring wiring t 1 001 2 0 1 a min limit switch 5 r b max lim tsw tch C capac tor 9 4 uF for 50Hz I o...

Page 26: ...D RT260A E RT260A DISCHAAGE SUCTION ECONOMIZER Oil PRESSURE PRESSURE PRESSURE PRESSURE I 1 l J J __ i7 C D E A RT68 B RT1 NH3 one stage tor V1 4 8 C RT1A R22 one stage tor V1 4 8 D RT260A E RT260A A R...

Page 27: ...fety devices wlth the exception of the spring loaded pressure safety valve and the pressure drop sensing switch are mounted inside a closed cabinet on the package front side as per fig 3 9 which also...

Page 28: ...X28 NO NC NO I NC S 17 G s j FIS P1 H20 ti P1 6 w2 A K12A 0 t S21t t 1 Al H 1 K18 i S2 op4 p os t ii t 1emp g 1 92 rn2 K16A 18 S2s i 2 9 t0J 9 y tl i to _ 1 j m i T x 9 22 r 8 s xo X48 21 8 S 4S 1 1...

Page 29: ...s K17A Aux llary relay for mimmum capacity K18A Auxiliazyrelay orK1M M1 Compressor drive motor 1 Page3 14 FIG 3 11 MAIN POWER SUPPLY M2 Oil pump motor M3 Capac ty conrrol adjusting motor P1 Service ho...

Page 30: ...re difference between oil pressure and dis charge pressure has been built up whereby a new current GRBSSa 8 EDIE NBCSVOORSOiR I T4ETRIEBS HlJ ff JNG IIISlRUCTIONIIANl WIIMll lf LJ n circuit is tormed...

Page 31: ...alves are closed and all flanged connections are sealed wlth a blind plate and gasket between flange and counlerflange fn order to prevent penetration of moisture and impurities it is recommended to l...

Page 32: ...th the package This symmetrically constructed all steel coupling shown in fig 4 1 consists of two flanges 1 and 7 two stainless steel plate packs 3 and a spacer 6 The steel pack is an integral assembl...

Page 33: ...securely align the coupling so as described hereaf er in the final alignment procedure 8 Mount the steel plate packs with spacer inbetween in such a way that the bolt holes are aligned opposite the r...

Page 34: ...is lower than the compressor The total indicator read ing is 0 20 mm n The distance to move the motor feet is half of the con centricity misalignment trom m above this is 0 10 mm o Add 0 10 mm of shim...

Page 35: ...by hose to the blowdown valve on the oil separator g Open the blowdown valve GRBSSa IIEIE NCSV00RS04RFT IIETAIEtlSAHl ElT IJtOC INS TFcUCTICIN h Start the vacuum pump and evacuate the system to 1 33...

Page 36: ...y source shoufd be obtained or the motor starter should be disconnected 4 14 SAFETY SWITCH ADJUSTMENT AND CHECK All switches are to be adjusted to values shown in Table 4 2 LOW OIL PRESSURE SAFETY SWI...

Page 37: ...max allowable value of 20bar 15 CAPACITY CONTROL ELECTRIC VALVE ACTUATOR CHECK With the ma n motor disconnected the min oil safety switch jumpered and the control system energ zed to simulate operati...

Page 38: ...he last two num bers 4 16 MOTOR ROTATION CHECK Remove the coupling spacer if fitted Check to see that the motor turns freely by hand Supply power to the motor starter and rotate the start button to th...

Page 39: ...al ltomatically 1he starting procedure glven in the instructions hereafter steps a through g should be fol lowed exactly 2 Restarting the compressor in a plant already oper ational In the case of rnan...

Page 40: ...mpressor operation To shut down a compressor tor long term period tightly shut both the suction and discharge stop valves and the economizer stop valve it fitted wi1h economizer _ Discon nect the powe...

Page 41: ...be invalu able in troubleshooting lt is recommended 1hat a log be kept of all readings at least every e1ght hours 6 2 INSPECTIONS SCHEDULES Compressor package stays in operation FREQUENCY J CHEC K POI...

Page 42: ...S15 The oil injection screw compressor has proved to be a most reliable and successfuJ compressor but because of the washing action of the oil the oil quality must be checked closely tor maximum compr...

Page 43: ...no air is being drawn in e Slowly open the suction stop valve in order to prevent liquid carry over f Remove the hose and replace the cap nut with gasket on the charging valve 6 9 MAINTENANCE OF MAIN...

Page 44: ...ner element trom the strainer housing Without darnaging the 9auze d Clean the element With a light solvent Then thorough ly dry the element preferably with an air blast e Check the gauze for damage f...

Page 45: ...pressor of the packa_ge lt is emphatically pointed out that the cause of a fai1ure must aften be sought in the refrigeration installa tion itself Therefore it is necessary in addlt on to this fault fi...

Page 46: ...me operative 1 b Too little or too warm cooling water 1b lncrease water sUpply 2 Oil cooler regulating valves out of adjustrnent 2 Adjust or repair or detective G High dischatge temperature 1 High oi...

Page 47: ...Air in the system 4 Discharge pressure gauge detective M Compressorvibratlng or 1 Liqu d refrigerant in suction vapor noisy 2 Coupling out of alignment 3 Rotor end play excess ve 4 Rotor hitting slide...

Page 48: ...on the electrical system and the line valves Others who do not know the machine may be faulty or is being repaired must not attempt to start the compressor until the servicing is complete and it is r...

Page 49: ...h are found f Make sure bath the oil supply armee and the oil draln line n the new cover 9 are open and the threads are clean g Oil the shaft and the inside of the rotating seal mem ber 4 with clean r...

Page 50: ...ELECTRIC VALVE ACTUATOR SERVICING refer to figure 7 2 The actuator is constructed w th an adequately greased gear case section this lubricant need never be changed however through disass mbly etc sho...

Page 51: ...1 10 15 16 17 18 9 a 7 6 s 4 3 2 1 d Withdraw the seal holder Using care to prevent scratching the O ring on the shaft e Remove the two seals 15 frorn the seal helder f Examine the seal for wear crack...

Page 52: ...ugh tor ao cess 10 the three shoulder screws 21 on the valve plate 20 _or unt1I the piston comes to a stop agams1 Ine retaln lng rin9 24 attached 10 lh hydrauhc cyliMer J Remove the three shoulder scr...

Page 53: ...3 on the end cover 19 b lnsert the pilot valve 6 through the locating plate 7 mto its bore in the piston and mount the valve ptate to the piston c lnstall the three shoulder screws 21 usIn9 care riot...

Page 54: ...al indicator touching the male or female rotor depending on which rotor is being checked g Set the d al indicator reading to zero h With a 3 4 inch 19 mm diameter by one toot 305 mm 1 long bar placed...

Page 55: ...over away trom the compressor through the coup l ng space between the compressor shaft and the motor shaft t Prevent dirt trom enter ng the compressor by covering J the discharge end with plastic or a...

Page 56: ...rotat ing and therefore touching the rotors by a capac1ty control valve gu1de This rs a separate valve guioe mounted loose on the end of the stator and has two machined shoes sup poning each U E rsio...

Page 57: ...e loctite 242 on the threads of the cap screws S h nstafl and sug up the cap screws 5 by hand i lnsert feeler gauges of 0 002 inch 0 0508 mm between the stator and each side near the top of the valve...

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Grasso GRASSOSCREW GSL Series, Instruction Manual

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