Instruction Manual Direct Drive Vacuum Pumps
Contents
1. Immediately order a replacement maintenance set or kit 31 Disassembling the pump Disassembling the motor block Remove the motor cover Q Remove the motor attachment screws Disassembling the fan Removethefanfastening screw andthe support washer Remove the key Replacing the front seal Seepage 30 Disassembling the gas ballast 1 Remove the gas ballast cover 2 screws the adjustment button the spring and the sleeve Remove the tank feed through 2 screws and its seal Disassembling the oil sight glass 2 Remove the sight glass cover Remove the plate the sight glass and the O ring Removing the oil case 3 Remove the oil case and its O ring after removing the 4 fastening screws 32 Disassembling the exhaust valve cover Remove the cover s the exhaust valves and their springs Disassembling the The oil system is set in the P Series Pumps factory it must be reset in oil system the event of disassembly see reassembly However the rear flange 7 can be disassembled without modifying the setting Remove the spinner cam 8 by removing the circlip Donotdisassemble the nozzle to clean it During the reassembly check that it is not blocked by sending a jet of compressed air through it Disassembling the P Series Pumps Remove the cover from the oil pump 9 Release the oil system cylinder 15 equipped with the washer piston and spring Release the stop valve 10 from2. Features Four 5 to 21 m3 h pump models with the following main characteristics Adirect drive motor makes the pumps very compact An electrically insulated foldaway handle is used for easy carrying An anti suck back system ensures the tightness of the pump during accidental or voluntary shutdowns A gas ballast enables the pumping of condensable vapors The universal three phase or single phase motor can be disassembled independently of the rest of the pump without the need to drain the oil case Ontheoil case a vertical sight glass can be used to inspect the oil level easily when filling the tank and during the operation of the pump Precision P series Pumps 1 Oil case 7 Frame 2 Gas ballast control 8 Inlet end fitting 3 Base 9 Exhaust end fitting 4 Oil level sight glass 10 Foldaway handle 5 Filling plugs 11 Electric motor 6 Draining plug 12 IEC electric socket The inlet and exhaust end fittings are PNEUROP ISO KF standardized They are fitted vertically on the pump at delivery but can be positioned on the horizontal openings if required by operating conditions They can also be used to connect many of our accessories The main replacement parts are interchangeable This enables easier disassembly assembly operations and replacement without changing the pump s performance Various accessories can be used to adapt the pump to meet the requirements of your application These acc
3. mist eliminator when pumping condensable vapors if it is essential do not connect it directly to the pump exhaust but place it outside the condensation zone remove the stop valve from the pump exhaust if possible connect the exhaust toa mechanical device creating a negative pressure from 0 1 to 0 2 bar Condensate trap Valve off the pump from the system and increase the pump temperature by running the pump for 30 minutes with the gas ballast open Start pumping and check the oil level the level drops oil is being lost the level rises condensates have been added to the oil After pumping regenerate the oil using gas ballast if it is cloudy or discolored the level is too high change the oil and regenerate Change the oil as soon as inlet pressure characteristics drop and are notimproved by regeneration 21 All pump models Purges Oil case purges Use of purge with gas ballast Purges for pumping condensable corrosive and hazardous gases The use of vane pumps may result in pumping gases or vapors which are flammable or that could contaminate the oil Inthis case these products must be diluted using purges supplied with dry gases such as nitrogen to avoid undesirable reactions For this purpose a filtered dry nitrogen supply or other inert gas with the same characteristics is required condensation point lt 22 C dust lt minimum absolute
4. Note single phase motors protection level IP 43 TEFC type have a thermal circuit interrupter with an automatic starting device when the internal motor temperature reaches a value over the preset limit value the motor stops However when the motor is cooled it will start up again automatically Beforeconnectingtothe mains checkthe positionofthe voltage selector High Voltage HV or Low Voltage LV see table page 16 The plug is equipped witha ground pin which must be connected The motor rotation direction is set at the factory 15 Motor characteristics connection protection Single phase motors Specific internal protection Voltage range change External motor protection electrical protection The information below is given as arecommendation he user must comply with the electrical standards or recommendations IEC VDE UL CSA etc applicable in the country in which the pump is used The use of electrical protection for the pump motor makes it possible to protect The motor in the event of excess voltage or rotor blocking the resulting excess current may destroy the coil and possibly the start up system for a single phase motor The pump in the event of a lubrication fault contaminated oil presence of particles increased resistance will draw excessive motor current Differential thermal circuit breakers should be used in which the mechanism contains an instantaneous disconnection controlled by
5. The choice depends on Expected pump performance Chemical aggression and corrosion of pumped gases Accessories used Desired maintenance intervals and total operating cost PRECISION has selected various types of oil for its pumps The pump is equipped with a lubrication system which regulates the oil flow rate required in the vacuum pump In addition this system also ensures the gassing of the lubrication oil and therefore the low noise level of the pump When condensable vapors are being pumped gas is compressed beyond its saturated vapor pressureinthe compression phaseandcan condense impairing pump performance The gas ballast can be used to inject a certain quantity of air neutral or dry gas into the last stage of the pump during the compression phase so that the partial pressure of the pumped gas is less than its saturated vapor pressure at the temperature of the pump Condensation is therefore impossible if this limit is not reached The maximum admissible vapor pressure is obtained at pump inlet for this value Atthe end of compression the pressure in the exhaust chamber is greater than atmospheric pressure An anti suck back device valve spring prevents the gases and oil from being drawn back into the inlet The saturated vapor pressure of abody is higher when the system is hot than when it is cold therefore the pump must reach operating temperature before pumping condensable va
6. a bimetal blade Never protect a three phase motor with fuses not equipped with a differential system ifthree phase motors are powered on 2 phases without a differential system the motor could burn single phase motor The table on the following page gives the characteristics at start up for temperatures gt 12 and in permanent operation Inthistable you will find for each pump a standard fuse or motor associated value three phase motor Thetable onthe following page gives for each pump the electrical characteristics in permanent operation and the proposed circuit breaker Single phase motors have a thermal circuit switch with automatic starting device CSA standard whenthe internal motortemperature reaches a value over the preset limit value the motor stops However when the motor is cooled it will start up again automatically The voltage range can be read beside the motor switch the dual frequency single phase motor can be configured for low voltage LV or high voltage HV To change this type of connection proceed as follows make sure that the motor is not switched on and the power cord isremoved e unfasten the 4 attachment screws on the motor upper cover and removeit e remove the voltage selector cover marked with the voltage press onthe voltage selector position Il invert the position of the voltage selector cover in order to show the other voltage at the outside of the motor cover HV
7. for high voltages or LV for low voltages Check to be sure that the voltage selector has fully latched the rocket switch when the voltage selector cover is replaced install the upper cover and refasten the 4 screws secure the upper cover as follows Center it on the front motor flange Install the connector between the relay and condenser Close the upper cover Install and tighten the 4 screws starting installing the screws on the pump handle side first 16 Three phase motors Electrical connections The pumpsare equipped with 9 wire terminal box motors the wiring diagram ofthe terminals is given as arough guide only In the event of doubt only the plate in the terminal box should be used as a reference Terminal box 9 wires LOW VOLTAGE CONNECTION HIGH VOLTAGE CONNECTION 220 240 V 50 Hz 220 280 V 60 Hz 380 415 V 50 Hz 380 480 60 Hz Parallel coupling Serial coupling see p oi 177 Summary tables of various characteristics and ratings of fuses and circuit breaker types of motors associated with types of motors standard PRECISION pump motors 5 to 21 m h single phase or three phase Single phase motor Current at Start up Proposed Ultimate Pressure A current A Fuse protection A Temperature 12 C aM Motor associated type fuse Start up Proposed Circuit current A Breaker protection A Voltage Frequency 50Hz 60Hz Standard Type 4 4 5
8. inserted in its housing aft seals 9 24 5 0 1 5 5 0 2 Y pe Direction of assembly They are fitted using the assembly mandrel according to the of shaft seals direction of assembly below HP stator LP stator LP rotor HP rotor rear flange median flange 36 seal holder Component preparation Reassembling the median flange Reassembling the exhaust valve cover Setting the oil system Reassembling the pump Rest the frame on a flat surface in order to raise the pump All surfaces in contact are coated with oil Observe a nominal clamping torque of 0 8 mdaN 5 8 ftlbs for the reassembly of the functional block The functional block is reassembled in the reverse order of disassembly On the median flange check that the lubrication hole is not blocked New vanes are assembled onthe rotors with the rounded edges facing outwards Poura small quantity of oil beforehand around the exhaust valve holes Position exhaustvalve coverthe exhaustvalves the springs andthe exhaustvalve covers P series pumps Offset the spinner cam 1 by pressing on the blades Turn the shaft up to the maximum displacement of the lever 2 The distance between the seat 3 andthe stop valve 4 mustbe 0 9to 1 2mm 0 035 to 0 047 inch it is set by adjusting the orientation ofthe lever Thestopvalve face
9. mustbe perpendicularto the axis ofthe oil inlet hole when free the stop valve should rest on its seat check the parallelism of the lever in relation to the bearing face of the stop valve seat Orient the seat to obtain the correct setting PC series pump Position the rotor of the oil pump so that the slot is horizontal or parallel with the pump base To turn it use the fan Do not forget the Oldham coupling 37 Reassembling the oil case Reassembling the gas ballast Reassembling the oil level sight glass Reassembling the seal holder Reassembling the motor side components Fitthe oil caseonthe frame Fastenthe attachments after making sure that the seal is positioned in its seal groove clamping torque 0 8 mdaN 5 8 ft Ibs Position the oil case feed through equipped with the seal in its housing by centering it on the gas ballast tube Assemble using the screws Equip the adjustment knob with the sleeve and the spring Position the assembly inthe cover and secure onthe oil case feed through Replace the O ring included in the seal kit Fitthe sight glass and assemble with screws clamping torque 0 3 mdaN 2 14 ft Ibs gradually tighten the two attachment screws in alternation to avoid placing the sight glass under stress 1 PC series pump The sight glass is made of glass See page 30 Fit the fan 1 2 sleeve Fit the drive key on the motor shaft Install the motor coupling sleeve down to the stop on
10. pressure 2 bar The purge dilutes pumped gases with a neutral gas itmakes it possible to limit corrosion in the oil case condensation and accumulation of gases in dead spaces of the pump Connect the nitrogen supply to one of the unused filling plugs on the oil case BSPP 1 8 Gas connection Set the nitrogen pressure to approximately 1 2 PSIG 0 1 relative bar flow 50 to 300 SCCM and the flow rate so as to satisfy the dilution conditions Caution do not generate an excess pressure gt 14 PSIG 1 relative bar A neutral gas supply can also be connected via the gas ballast BSPP 1 8 Gas connection 22 Oxygen pumping In certain applications mixtures containing oxygen at different concentrations or even pure oxygen are used Oils of mineral origin are combustible Exposure to pure oxygen at high temperatures may cause them to self ignite In addition they are highly oxidized during pumping and quickly lose their lubricating properties Mineral oils must not be used for oxygen levels of over 21 in pumped gases In this case perflourinated synthetic oils must be used The use of these oils requires a special pump preparation see page 29 The pump must be completely disassembled and all traces oil mineral oil removed Flushing the oil case is not adequate In addition itis strongly recommended notto use fluids such AN as tri aryl phosphate ester which are known to cause accidents Any accumulation of oxygen in th
11. with a sample of new oil in order to check the level of contamination or deterioration of the lubricant The frequency at which oil is renewed is adapted to the type of operation e if the oil is cloudy this indicates that condensables have been absorbed during pumping The oil can be regeneratedusing the gas ballast see page 19 athickening of the oil together with a blackish color and a burnt smell indicate that the oil has deteriorated Drain the pump and flush it Normally for a pump operating continuously at a pressure lower than 0 75 Torr 1 mbar with a clean gas dry air the oil should be changed every 6 months This value is given as aguide only It may be extendedto 1 year ifthe ultimate vacuum required is sufficient for primary vacuum pumps Similarly if the pump is stopped frequently for long periods the oil should be changed at intervals of 6 months to a maximum of 1 year oil may become sticky Note Every pumping operationis different This oil musttherefore be changed at intervals adapted to each specific application The use of certain accessories can reduce the frequency of these maintenance operations The draining operation places the contaminated pumping circuit in communication with the outside atmosphere Take all necessary steps to ensure personal safety The pump mustbe drained when hot and after the oil case has been vented to atmospheric pressure For this switch off the pump isolate
12. 0 Torr 1 3 mbar as well as applications where large amounts of condensable gases are present Two stage rotary vane pump Application Toimprove the backing pressure and flow rate atlow pressure two stages are connected in series The second is similar to the first both structurally and operationally The gases pulledin by the first low pressure stage are transferred to the second high pressure stage and discharged through the high pressure HP valve In Exh Low pressure stage High pressure stage Two stage rotary vane pumps are the best choice for application requiring an ultimate vacuum as low as 10 Torr 1 33 x 10 mbar NOTE WHEN OPERATING A TWO STAGE VANE PUMP CONTINUOUSLY GREATER THAN HALF AN HOUR ABOVE 10 TORR THE UNIT SHOULD BE EQUIPPED WITH AN OIL MIST ELIMINATOR AND OIL RETURN SYSTEM ORA SINGLE STAGE PUMP SHOULD BE USED Its function Choosing the right oil Lubrication and antinoise device Gas ballast Oil Oil has several important functions in the pump Itlubricates mechanicalcomponents bearings seals rotor vanes etc Itmakes moving parts relatively tight by limiting internal leakage Itcarriesawaythe heat producedbythe compressedgases Not all oils produce the same ultimate pressure in a given pump Ultimate pressure depends onthe saturated vapor pressure ofthe oil its viscosity and its ability to dissolve gases Good pumping conditions are related to the type of oil used
13. 100 200 Pcx300 20 65 Frequency Hz 50 60 50 60 50 60 50 60 50 60 Number of Stages 2 j 2 2 2 2 Rotation speed 1500 1800 800 1500 1800 1500 1800 Noa mih 5 4 6 18 20 7 248 30 36 10 6 14 6 23 3 12 5 155 20 27 319 11 8 18 8 7 5x105 1x104 1 5x104 2x104 1x102 2x10 Torr mbar 1 5x103 2x10 2 2x103 3x103 Pa 2x10 3x10 7 5 103 102 1 5x103 2x10 Pa 1 2 95 kg lbs 2 27 69 4 3500 2 0 1000 700 3000 20 90 Partial pressure measured according to Pneurop 6602 specificatin It may vary if other oils are used These values are for pumps equipped with universal single phase motors Dimensions Pump Pump Styles P100 P420 Filling 177 Exhaust 3 8G ISO KF DN25 ISO KF j A TM 2 192 _ 63 45 _4 8 mm diam holes Dmin3 BG Pump Styles P 765 and P 1420 Dimensional drawings P 765 PX765 P 1420 PX1420 455 529 L 2 NW 40 Inlet 288 342 103 la b EU Pd 114 G 1
14. 18 _ exhaust Gas ballast LOIN N Eh lt a Z alo e eu lt 3 Drain plug 3 8 0 1 t t 31 29 206 229 140 190 375 459 2 213 264 437 521 33 63 765 291 452 526 L 5 91 288 342 103 Ta b SO Gas ballast inlet 118 Fill plug Exhaust Oil casing purge Inert gas inlet 114 G 1 8 NPT D 336 385 389 to 398 438 to 447 Oil filter 31 29 206 229 QUA 140 190 213 264 375 459 437 521 Types 33 63 Dimensions Dimensions Motor L D H a b Motor E D H a b P N P N type mm mm mm mm mm type mm mm mm mm mm 765 142 2 7 P1420 JULCSA 195 149 25 87 765 240 185 65 9 PC 1420 Unpacking Storage Safety instructions concerning the installation and operation of pumping systems Before switching on the equipment the user must read all of the start up and operation sections of this manual and observe the safety instructions listed in the booklet of declarations of compliance supplied with the unit When you receive the equipment unpack it carefully Do not discard the packaging until you have ensured that the pump has notbeendamaged during transport Otherwise take the necessary measures with the transporting company and if necessary notify PREC
15. 5 2 2 Three phase motor Temperature 12 C 17 Preliminary precautions Operating temperature Before starting the pump Operation only be guaranteed if it is operated according to normal conditions of use The vacuum pump is also a compressor incorrect operation may be dangerous Study the user manual before starting up the pump The pumps are designed to prevent any thermal risk for user safely However specific operating conditions may generate temperatures which may justify particular attention on the part of the user gt 70 C Producttightness is guaranteed for normal operating conditions when the product leaves the factory It is the user s responsibility to maintain the level of tightness particularly when pumping dangerous products on PC or PCX series pumps 1 The performance and operating safely of this product can Be sure to fill the pump with oil see page 11 At start up before switching on the motor check thatthe oil bath temperature is greater than 53 F 12 C The ambient operating temperature for the pump must be between 53 F 12 C and 113 F 45 C Under these conditions the stabilized pump temperature at the front of the oil case will be between 140 F and 158 F 60 and 70 C depending on operating conditions Special case Synthetic oils Synthetic oils are much more viscous when cold than mineraloils Do not start up the pump at ambient tempera
16. ISION For all handling only use the devices provided for this purpose lifting rings handle etc The pump is not supplied filled with oil The oil is contained in separate boitles Similarly it is recommended to drain the pump before re dispatching the equipment If the pump is to be stored we guarantee the reliability of our equipment without particular storage precautions for up to 3 months ambient temperature between 41 F and 149 F or 5 and 65 C e For storage periods of over 3 months we recommend tofillthe pump with oil during storage For this fill the pump and run it at ultimate vacuum inlet orifice blocked for approximately 1 hour in order to lubricate all the parts of the functional block see page 18 Then stop the pump and store it with the inlet and exhaustorifices sealed clamping ring centering ring plug etc The shaft should be rotated by starting the pump every six months following this storage procedure After 6 months storage without oil factors such as temperature degree of humidity salt air etc may cause the deterioration of the pump components particularly the hardening of O rings and the sticking of lip seals on shafts and the gumming of oil In this state apump may have operation problems particularly oilleaks Before the next start up the pump must be disassembled see page 31 and all the seals changed Note 1 The seal kits must be stored with caution Keep them away from he
17. PRECISION Instruction Manual Direct Drive Vacuum Pumps Standard Models Model Precision Catalog No P100 51220221 P200 51220225 P300 51220229 P420 51220233 P765 51220237 P1420 51220240 Corrosion Resistant PC100 51220223 PC200 51220227 PC300 51220231 PC420 51220235 PC765 51220238 Explosion Proof PX100 51220222 PX200 51220226 PX300 51220230 PX420 51220234 PX765 51220239 PX1420 51220241 Corrosion Resistant Explosion Proof PCX 100 51220224 PCX200 51220228 PCX300 51220232 PCX420 51220236 Precision 170 Marcel Drive Winchester VA 22602 USA Phone 540 869 8623 Toll Free 800 621 8820 FAX 540 869 8626 Manual P N 83000027 Rev B Dated 15NOV01 NOTICE THE MATERIAL IN THIS MANUAL IS FOR INFORMATION PURPOSES ONLY THE CONTENTS AND THE PRODUCT IT DESCRIBES ARE SUBJECT TO CHANGE WITHOUT NOTICE PRECISION MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THIS MANUAL IN NO EVENT SHALL PRECISION BE LIABLE FOR ANY DAMAGES DIRECT OR INCIDENTAL ARISING OUT OF OR RELATED TO THE USE OF THIS MANUAL For repair information or replacement parts assistance from the manufacturer call Customer Service using our toll free telephone number 800 621 8820 FAX 540 869 0130 REVISION STATUS INDEX DATE AMENDED PAGES NOTES A 6 00 Add P765 and P1420 references Add Spare parts and warranty info B 11 01 40 Corrected P100 420 motor part no Contents The Precision P Series Vacuum Pumps Introduction and Unpackin
18. a smoke mist Inlet Make sure that all the components or the chamber connected to the pump inlet withstand a negative pressure of 1 barrelative to atmospheric pressure Also make sure that the maximum excess pressure does not exceed 1 bar relative to atmospheric pressure for security 13 eliminator If the pump exhaust orifice is connected to an extraction duct or an oil mist eliminator the exhaust stop valve fitted in the pump exhaust orifice must be removed At the pump exhaust the evacuation circuit must be such thatthe resulting excess pressure in the oil case is as low as possible for correct pump operation the max exhaust pressure recommended should be 1 125 Tor 1 5 bar absolute pressure Changing position of inlet and exhaust fittings Disassembling the fittings Horizontal reassembly Depending on the types of accessories used and the pumping conditions these orifices can be fitted vertically on the pump or horizontally as shown on the diagram below Note The pump is supplied in configuration A n P Exh Unfasten the attachment screw from the end fitting to be removed Unfasten the end fitting and remove it from its housing along with the O ring In the case of the inlet end fitting also remove the inlet filter 2 Remove
19. at and light sunlight and ultraviolet light in order to preventthe elastomers from hardening AFNOR standard FD T 46 022 10 Installation and start up The machines must be connected to an electrical installation in compliance with decree 88 1056 dated 14th November 1988 as well as any local electrical codes that apply e importantto isolate the machine from the power source before any maintenance is done on the equipment When switching off the power of equipment containing capacitors loaded with over 60 VDC or 25 VAC take precautions when accessing the connector pins single phase motors equipment with mains filter frequency converter monitor etc Vane roughing pumps use lubricants It is recommended to request information from the manufacturer on the safety data sheets concerning the product used Our pumps are tested in the factory with a high quality distilled oil PRECISION recommends the use of PRECISION B oil with all of their vacuum pumps If changing the type of oil refer to the chapter concerned for the procedure and the type of lubricant required Our pumps are designed to prevent any thermal risk for user safety However specific operating conditions may generate temperatures which may justify particular attention on the part of the user outer surfaces gt 70 C 11 Filling with oil Checking the oil level PRECISION two stage pumps for corrosive applications are tested in the fac
20. d eorrective aolors doce ien 26 cease io tie li ep aleam ecole pri ue LARA Lr a ipie iet 29 Draining a eh Sii en cade es uaa ceo M a Dc EU S uS 29 PIUSHING the PUMP e bee d 30 0111 1181 591 type Ob OM es oed aste atum beer 30 Replacement of front shaft seal 2 iibi turi ue qn eiu iuc IE 31 Disassembling Tie DOTT eire 555554 54 eR ea Ma 32 Gleaning compollelliss s etie UD GR v m t d D a dentatis 35 Replacement of all shaft seals dies le ui Ep pA ee E ee dE 36 Heassemblind era rib euer PI MEE LED IE 37 Spareparts and accessories sce een EN och sello ie RM DN Ri LEO EE 39 41 Introduction Your satisfaction and safety areimportantto PRECISION and a complete understanding of this unit is necessary to attain these objectives As the ultimate user of this apparatus you have the responsibility to understand its proper function and operational characteristics This instruction manual shouldbe thoroughly read and all operators given adequate training before attempting to place this unit in service Awareness of the stated cautions and warnings and compliance with recommended operating parameters together wit
21. e installation should be avoided and the oxygen or combustible mixture should be diluted with a neutral gas at the exhaust the gas flow rate should be 4 times the oxygen flow rate Certain combustible or explosive gases require a higher degree of dilution Our International Support Services and Customer Services can advise you to help solve problems of this kind 23 For intermittent pumping For cyclical pumping For continuous pumping at high pressure Recovery of oil high pressure and cycling When the pump operates at high pressure the oil heats up becomes more fluid and is flushed out of the functional block by the gas stream Oil losses at the exhaust are increased If the pump only operates for a very short time at high pressure the lubricating oil is replaced when the pump returns to low pressure The use of a oil mist eliminator prevents losses due to intermittent high pressure operation If the pump operates at high pressure in a cyclical fashion oil consumption may reach sufficiently high levels according to the pumped volume and pumping cycle rates causing the level to drop in the oil case There is then a risk of seizure due to a lack of oil In addition the high flow of gas passing through the eliminator prevents oil from returning to the oil case In order to pump in these conditions the pump must be equipped with an oil recirculating kit which enables oil recovery via the gas ballast Cyclical pum
22. ection by carrier s agent within 15 days of the delivery date then file a claim with the carrier If you follow the above instructions carefully PRECISION will guarantee our full support of your claim to be compensated for loss or damage in transit DO NOT for any reason return this unit to PRECISION without first obtaining return authorization In any correspondence with PRECISION please supply the nameplate data including catalog number and serial number A wide range Specific solutions adapted to various applications Standard pumps Corrosion resistant Explosion proof Explosion proof Corrosion resistant Presentation of the product range Precision oil seal rotary vane pumps are used in all vacuum technology applications They can be used on their own to achieve a maximum vacuum of 10 Torr 10 mbar or in pumping assemblies e g at the exhaust of a diffusion pump or turbo molecular pump These pumps are used in all noncorrosive applications Manufacture of light bulbs production of 1V tubes manufacture of electronic tubes metallurgy centrifuges vacuum ovens etc Pumps suited to the pumping of corrosive gases R amp D laboratories freeze drying pumping of solvents extractions etc Pumps with sealed motors For all applications in class 1 11 group D E F and environments For use in applications in class Il group D E F and G environments where corrosive gasses will be produced
23. essories can be mounted to the top or the side inlet and exhaust ports The moulded aluminium pump frame supports the pumping module and the motor Allthe parts of the pumping module in contact with gases are free of zinc copper and cadmium The other construction materials include cast iron aluminium alloy stainless steel fluorocarbons FPM nitryl NBR and chemically resistant polymers Rotary vane pump The pumping cycle is given below Inlet Transfer Compression Exhaust Application Operating principle of the rotary vane pump Each stage of the PRECISION P series pumps consists of A hollow cylindrical stator with inlet and exhaust valves Arotor mounted eccentrically inside the stator for pumping Two vanes sliding in the rotor forced against the stator by centrifugal force and springs As the vane passes in front of the inlet orifice an increasing space is formed into which the gas from the chamber to be evacuated expands When the second vane passes the space is closed The gas trapped in the space between the two vanes is transferred to the exhaust orifice as the rotor rotates The space communicates with the exhaust which is fitted with a valve the gas is compressed until the safety valve is opened The gas is expelled into the oil casing when the pressure is sufficient to open the valve Single stage rotary vane pumps are the best choice for continuous pressures above 1
24. g ons os sa ies desi tenis sehen db dou yee Pe 1 Presentation of the product rage cto entire oer qd 2 Operating principle of ena et hon Doc R E 4 Technical characteristics seat add diuo dito ten Po opea 7 Pump Tasse 8 Installation and connections Safety INS 58555224 558882 E 10 Filing ON 12 aed epiac tdi pod o it c qu m rst 13 Electrical connections 2 acne HEP ot diede eek ae n o Add t ect 15 qe t 16 Operation PROC AUMON 18 18 Before starting p he 18 19 Operation ofgas Dallas 21222 02 8 108 al aca detect 20 Particular USES est e 22 ETE o PERS 23 High pressure pumping and iocans eaa Eo ie E bcati e pi otia 24 Maintenance aieo P M MR 25 Troubleshooting an
25. h maintenance requirements are important for safe and satisfactory operation The unit should be used for its intended application alterations or modifications will void the warranty WARNING AS A ROUTINE LABORATORY PRECAUTION ALWAYS WEAR SAFETY GLASSES WHEN WORKING WITH THIS APPARATUS This product is not intended nor can it be used as a sterile or patient connected device In addition this apparatus is not designed for use in Class Il or 111 locations as defined by the National Electrical Code Unpacking and Damage This product was carefully packed and thoroughly inspected before leaving our factory Save all packing material if apparatus is received damaged Responsibility for safe delivery was assumed by the carrier upon acceptance of the shipment therefore claims for loss or damage sustained in transit must be made upon the carrier by the recipient as follows Visible Loss or Damage Note any external evidence of loss or damage on the freight bill or express receipt and have it signed by the carrier s agent Failure to adequately describe such external evidence of loss or damage may result in the carrier s refusing to honor your claim The form required to file such claim will be supplied by the carrier Concealed Loss or Damage Concealed loss or damage is any loss or damage which does not become apparent until the merchandise has been unpacked and inspected Should either occur make awritten request for insp
26. hat the electrical installation conforms with your local safety requirements It must include the appropriate fuse and reliable earth ground 1 The machines mustbe connectedto an electrical installation Electrical motorisin accordance with major international standards UL CSA CE and offers two voltage ranges e Low voltage 170 V to 254 V 50Hz 170 V to 300 V 60Hz High voltage 342 V to 460V 50Hz 342V to 520V 60HZz All three phase motors protection level IP 43 TEFC type must be protected by a customer supplied starter consisting of a suitably rated contactor and thermal overload Furthermore they are equipped with a dry contact NC thermal protection which is available in the terminal box Wire the motor according to the line voltage The connections to be made are shown on a diagram inside the terminal box or on its lid Check the direction of rotation of the motor direction of arrow located on the motor cover For this Remove the protective caps on the inlet and exhaust orifices Vent the pump to atmospheric pressure e Switch onthe pump for 2 to 3 seconds with your hand onthe inlet orifice If suction is felt the wiring is correct Otherwise invert 2 consecutive phases The earth terminal must be connected correctly Electrical motorisin accordance with major international standards UL CSA CE and offers two voltage ranges Low voltage 90 V to 132 V 50 60Hz High voltage 180 V to 254 V 50 60Hz
27. its housing Unscrew the seat of the stop valve 11 andremovethe O ring Then removethe vane 12 the oil pump rotor 13 and the Oldham coupling 14 O e 33 Disassembling the exhaust valve cover Remove the 4 nuts and washers Release the flange in the axis Disassembling the Removethestatorby sliding it HP stator and the rotor alongthe rotor two stage pumps Release the rotor and the vanes Disassembling the Insert two screwdrivers in the intermediate flange notches and release the flange two stage pumps in the axis Disassembling the Remove the LP stator LP stator and the rotor Removethe rotor andthe vanes equipped with the springs 34 Cleaning metal components Cleaning the oil level sight glass P series pumps PC series pumps Cleaning components Solvents are required to clean components Standard precautions should be taken in compliance with the manufacturer s instructions Afteruse in mineral or synthetic oil clean the metal components with a mineral products based solvent such as AXAREL CARECLEAN PREMACLEAN NAPHTEOL Proceed as follows Clean when cold or hot max 45 C by dipping or using a cloth Vacuum dry in a ventilated oven The component must be cleaned a second time with alcohol After use in perfluorinate synthetic oil clean the metal components in a solvent such as GALDEN S 90 and proceed as follows Clean when co
28. ld by dipping or using a cloth Dry the components in the air or with compressed air After use in non perfluorinate synthetic or mineral oil clean the metal components with a solvent such as alcohol and proceed asfollows Clean when cold by dipping or using a cloth Dry the components in the air Industrial washing solutions can also be used The cleaning operation should be followed by vacuum drying Whencleaning this plastic sight glass avoid contact with alcohol or alcohol based washing solutions Clean the component with a solvent but do not steep it and rinse it immediately The sight glass of these pumps is made of glass DUPONT DE NEMOURS registered trademark 2 CASTROL registered trademark 9 DOW registered trademark Nippon Chemical registered trademark 5 MONTEDISON registered trademark 35 Replacement of sh Specifictools Specific assembly mandrel A support plate or washer Recommended tools Aflat screwdriver Extracting a shaft seal from With the flange flat the seal its housing is extracted using a screwdriver resting on the plate or washer so as notto damage the seal housing Assembling the shaft seal The seal housing andthe seal lip are lubricated with the lubricant used in the pump The flange is resting on a flat surface According to the direction of assembly specific to each pump the seal is fitted on the assembly mandrel Using a press or a hammer the seal is
29. m the installation to which itis connected lf possible position the pump vertically with the motor atthe top resting on the front side of the oil case in this position it is not necessary to drain the oil case Otherwise disassemble the pump in the horizontal position resting it on its base after it has been drained Disconnect the motor by unscrewing the 4 fastening screws simultaneously and alternately Remove the motor vertically Unscrew the fan fastening screw Remove the fan the key and the support washer With a screwdriver remove the shaft sleeve and its O ring Unscrew the two seat holder fastening screws and remove the seal holder Remove the seal from the seal holder as described on page 35 and discard it Clean the metal parts Inspect the wearing side of the shaft sleeve after cleaning the sleeve may show a perfectly normal trace of rubbing caused by polishing Should the sleeve show any signs of indentation or grooves it must be replaced Preferably use new parts from the seal kit or set of seals Reassemble the lip seal in its housing as described on page 35 Reinsert the new O ring on the seal holder e Insert the shaft sleeve inside the seal holder Engage the reassembled seal holder on its axis and screw onto the frame e Insertthe O ring in the shaft sleeve Position the support washer Then install the key reassemble the fan and the motor in the reverse order of disassembly
30. ncidents The vacuum pump does not produce a vacuum continued Noisy pump Pump too hot Causes Corrective actions Ultimate pressure obtained afew 10 Torr 10 Gas ballast adjustment button open O ringpinched One of the seals is damaged One of the HP safety valves is damaged Lubrication holes blocked Incorrect anti suck back assembly Part forgotten in reassembly Accessories At the pump exhaust the installation produces an exhaust pressure of 1 125 Torr 1 5 bar Cil mist eliminator cartridge clogged Oil level too high Oil contaminated presence of particles Pump not prepared for the oil used Incorrect motor power supply Motorbearings damaged Motor coupling incorrectly set or damaged Incorrect fan assembly Incorrect anti suck back device assembly Vanes damaged or stuck Ambient temperature too high Pumpplacedinapoorly ventilated place or vents blocked Operation at high pressure P gt 22 30 mbar Excess pressure at exhaust Motor in overvoltage or Motor in short circuit Oil contaminated Pump not prepared for the oil used or oil unsuitable 27 Close Replace Replace Replace Disassemble and clean Repeat the assembly and setting Repeat the reassembly Check the installation Replace Drain and fill with a new oil Drain flush and refill with clean oil Checkthe pumpconfiguration orthe type of oil Check the power suppl
31. nd on the following assembly conditions accessory filters the oil used mechanical connections pipes etc maintenance frequency and quality For the assembly of the vacuum circuit provide the accessories required for maintenance valves purges etc The pump canbe mounted ona frame using the 4 attachment holes on the base and the shock mounts supplied Note Special shock mounts effective against the pump s own vibrations can also be used but they do not ensure correct attachment during the transfer of equipment In this case the pump should be clamped onto its support The pump and the motor are each equipped with a ventilation system During pump installation the pump should be placed in ventilated place Provide a minimum gap of 25 mm around the pump The vents on the pump and the motor should be checked regularly to ensure that they are not blocked PRECISION P series pumps are designed for operation at an ambient temperature between 53 F and 113 F 12 45 C Ne the protective caps on the inlet and exhaust orifices these components prevent foreign bodies from entering the pump during transport and storage It is dangerous to leave them on the pump during operation The pumpinlet and exhaust orifices are equipped with DN 25 ISO KF end fittings which can be used to fit various line components made of stainless steel plastic etc Exhaust It is recommended to connectthe pump exhaust to
32. ock Thus if you wish to use another type of oil proceed as follows Mineral oil can be replaced by another type of mineral oil Simply flushthe pump see above usingthe new oil andfillthe pump see page 11 Mineral oils are also compatible with mineral based synthetic oils This is the case when for example a mineral oil is replaced by a synthetic oil Synthetic oils are considered to be incompatible with each other tor practical reasons they are expensive A mixture may cause slight cloudiness of the resulting mixture which could beinterpreted mistakenly as asign of contamination or deterioration Forthe same reasons clear synthetic and mineral oils which are also expensive are treated as synthetic oils These remarks apply to ester or fluorocarbon type synthetic oils Proceed as follows Disassemble the pump completely and clean it see page 31 Reassemble it Connect an oil mist eliminator to the pump exhaust Fill the pump with the new oil see page 11 NOTE to replace a synthetic oil by a mineral oil proceed as for compatible oils 30 Replacement of front seal In the event of an external oil leak on the pump it is necessary to change the shaft seal on the motor side You will need a front seal replacement kit if available minor maintenance repair kit ascrewdriver a3 4 and 5 mm Allen wrench Stop the pump and disconnect the power cord motor Disconnectthe pump fro
33. ons containedin PRECISION formal sales contracts shall be controlling and any changes must be in writing and signed by an authorized executive of PRECISION All defective components will be replaced without charge one 1 yearfromthe date of delivery There will be no charge for labor if the apparatus is returned to the factory prepaid Conditions and qualifications of the warranty statement shall prevail at all times 41
34. p is reduced or prevented The pump s capacity to eliminate condensable vapors is related to their type the pump temperature and the quantity of air introduced by the gas ballast Thus for high vapor levels in asystem the single stage pumpis more suitable However when notpumping vapors its ultimate pressure is higher Care should be taken to limit the inlet pressure of the pump to its maximum admissible water vapor pressure with the pumped product This is obtained by reading the pump characteristic table for water vapor The use of cold traps or condensers are recommended when large quantities of vapors are to be extracted Excessively intense or prolonged pumping may cause the products condensed inthe trap to be evaporated a second time Choose anoil which facilitates the separation of pumped products which may be condensedin the oil bath anti emulsion oil for water based compounds etc The condensation of vapors at the pump exhaust is reduced if the pump and oil temperature are high the pressure at the exhaustis as low as possible removal of the oil mist eliminator the condensates are collected separately from the oil bath and do not block the exhaust duct For this avoid using any vertical ducting which promotes the condensation of products and the return of these products to the pump use a condensate collector 20 Assembly continued ewe do not recommend an oil In
35. ping ODK type oil recovery device Device is not tight An electro valve ensures 1 Drain kit type Drain kit type ll when switched off tightness when switched off Inthis case or when very large volumes requiring several hours of pumping are being pumped it is recommended to recover the oil via the pump inlet 24 Maintenance General precautions For normal operations the maintenance of PRECISION P series pumps only require regular oil changes Before any draining or maintenance operation check the pumping conditions of the installation potential toxicity corrosion or radioactivity of pumped gases Depending on the case we recommend to purge the pumping installation with dry nitrogen before maintenance wear gloves protective goggles and if necessary a breathing apparatus ventilate the premises well and disassemble the equipment under a suction hood not to dispose of used oils and residues using the standard system and if necessary have them destroyed by a specialized company After acomplete maintenance operation itis recommended to perform a helium leak tightness test 25 Troubleshooting and corrective Incidents The pump is not running The pump does not start The vacuum pump does not produce a vacuum Causes Incorrect motor power supply Temperature toolow Gummingofseals after prolonged storage Oil contaminated after pumping Motor coupling damaged Pump sei
36. pors of the pump as well as the temperature The gas ballast control located at the front of the oil case cannot be used to set the gas injection flow rate When the gas ballast control is open the pump is not tight when stopped To guarantee this tightness install an automatic gas ballast Using the gas ballastincreases the ultimate pressure Technical Characteristics Standard Series haracteristics requency umber of Stages otation speed Nominal flow rate Flow rate Pneurop method Partial ultimate pressure Torr mbar 0 2 2 10 3 10 2x102 3x10 Torr mbar 1 5x10 2x10 2 2x103 3x10 Pa 2x10 3x10 Ultimate pressure with Torr mbar 7 5x10 10 1 5x103 2x10 Pa 1 2 25 55 27 59 4 capacity Ballast flowrate 1 1 m h Pa 3500 2500 2000 1500 1200 1000 700 3000 2500 110 100 80 0 700 120 DN 25 Partial pressure measured according to Pneurop 6602 It may vary if other oils are used These values are for pumps equipped with universal single phase motors with Alcatel 120 oil Ultimate pressure with gas ballast closed gas ballast open Oil Capacity Note The pressure measurements were made with a capacitive diaphragm pressure gauge measuring a total pressure in the absence of a cold trap Measurements using a Pirani type gauge can give different pressure values Corrosive applications PC100 PC200 PC300 PC420
37. rdance with appropriate operating instructions for a period of no less than one 1 year from the date of delivery of the products Sole obligation of PRECISION shall be to repair or replace at our option FOB factory or locally without charge any part s that prove defective within the warranty period provided the customer notifies PRECISION promptly and in writing of any such defect Compensation for labor by other than PRECISION employees will not be our obligation Part s replacement does not constitute an extension of the original warranty period PRECISION MAKES NO WARRANTY OF MERCHANTABILITY FITNESS FORA PARTICULAR PURPOSE OR ANY OTHER WARRANTY EXPRESSED OR IMPLIED AS TO THE DESIGN SALE INSTALLATION OR USE OF ITS PRODUCTS AND SHALL NOT BE LIABLE FOR CONSEQUENTIAL DAMAGES RESULTING FROM THE USE OF ITS PRODUCTS PRECISION will not assume responsibility for unauthorized repairs or failure as a result of unauthorized product modifications or for repairs replacements or modifications negligently or otherwise improperly made or performed by persons other than PRECISION employees or authorized representatives While our personnel are available to advise customers concerning general applications of all manufactured products oral representations are not warranties with respect to particular applications and should not be relied upon if inconsistent with product specifications or the terms stated herein In any event the terms andconditi
38. the attachment screw from the lateral cap and using a wide screwdriver remove the cap ET Position the end fitting in the amp n corresponding lateral orifice taking care to fit the O ring Attach the end fitting with the 1777 screw In the case of the inlet end fitting fit the filter at the bottom of the orifice Close unused orifices with plugs and fasten the screws 14 Three phase version Single phase version Electrical connections in compliance with the decree 88 056 dated 14 November 1988 as well as any local electrical codes that apply Our products are designed to meetcurrent EEC regulations modification on the part of the user are liable to cause noncompliance with regulations or even affect the EMC Electromagnetic compatibility performance and safety of the product Precision cannot be held responsible for consequences resulting from such an intervention Before any maintenance intervention on a product performed by a maintenance operator who has not been trained on safety regulations EMC electrical safety chemical pollution etc isolate the product from its various energy sources electricity compressed air etc As a general rule it is recommended to protect the motor for 120 of its nominal current see page 15 Checkthatthe electrical wiring and the voltage selector position of the motor correspond to the line voltage before starting up the pump Ensure t
39. the motor shaft Fit the motor on the frame and install the 4 mounting bolts clamping torque 1 mdaN 7 14 ft Ibs 38 SPARE PARTS AND ACCESSORIES Maintenance and Repair Kits MINOR KIT includes gaskets shaft and valve seals and O rings MAJOR KIT includes the contents of MINOR KIT plus vanes spring gas ballast valves drain valve sight glass and flexible motor coupling PUMP ACCESSORIES VACUUM OIL 34001241 Smoke Mist Eliminator Precision B Premium Grade double distilled high purity low vapor pressure oil for both direct drive and belt drive pumps 34002655 Gallon 4 case 34002656 5 gallon container VACUUM TUBING RED GUM RUBBER VACUUMTUBNGREDGUMRUBBER Adjustable tubing clamp for 34167068 34167095 34167100 39 Description Base plate Motor NW 25 o ring NW 25 clamp NW 40 o ring NW 40 clamp Oil sight glass cover Handle Fill plug Drain plug Gas ballast knob Packing carton Miscellaneous Spare Parts Part numbers N A 81000976 81000922 81000923 81000922 81000923 81000943 81000944 81000977 81000944 81000945 81000946 81000980 81000981 81000947 81000978 40 P PX 1420 81000973 81000971 N A N A 81000974 81000922 81000980 81000979 Warranty PRECISION warrants its products against defects in material or in workmanship when used under appropriate conditions and in acco
40. the pumpor disconnect from the installation tilt the pump unscrew the draining plug on the side of the oil case and the filling plug on the top of the oil case When all the oil has drained replace the two plugs temporarily and run the pump for about 10 seconds leaving the intake open Take care with the oil mist which may appear at the exhaust This operation removes the oil from the functional block drain this oil by removing the draining plug replace the draining plug and fill with fresh oil to the appropriate maximum level of the oil case oil sight glass through the filling orifice see page 11 29 Flushing Change type of oil Compatible oils The draining operation can be followed by a flushing operation ifthe oilis particularly dirty This operation requires a volume of oil equal to the capacity of the pump After draining the oil case See page 28 replace the draining plug Remove the intake filter clean it and replace it Run the pump at atmospheric pressure pour the flushing oil very slowly through the inlet orifice Take care with oil mist which may develop at the exhaust Stop the pump and drain the flushing oil via the draining plug Replace the plug and fill with fresh oil see page 1 PRECISION P Series pumps are tested in the factory with a high quality distilled oil unless specified otherwise in the order When the pump is delivered a certain quantity of oil remains in the functional bl
41. to accelerate heating It is normal for the oil level to change as canbe seen through the oil sight glass when the pumpis hot due to expansion of the oil starting of the oil circuit and the operating conditions of the pump inlet pressure If necessary stop the pump and adjust the oil level between the and min levels on the sight glass In the event of a malfunction refer to the Troubleshooting and corrective actions table page 25 19 Regeneration of pump oil Pumping condensable vapors Choice of pump and system Choice of oil Assembly Operation of gas ballast In a pump stored with the same oil for a long time condensed vapors may contaminate the oil bath and affect performance This is also the case after pumping vapors and when the oil appears cloudy or discolored through the sight glass e Run the pump shutting itoff from the system atthe inlet by a valve or a plug Open the gas ballast and allow the pump to operate for 1 2 hour to 1 hour or longer if the oil remains cloudy This operation accelerates the temperature rise of the pump while eliminating residual vapors present in the oil bath To pump with condensable products it is necessary to operate with a hot pump For this isolate the pump from the system and allow itto operate for 1 2 hour with the gas ballast open or 1 hour if possible with the gas ballast closed When the oil bath is hot the condensation of vapors in the pum
42. tory with a high quality distilled oil At delivery there is some oil remaining in the functional block Our pumps are tested in the factory with a high quality distilled oil PRECISION recommends the use of PRECISION B oil with all of their vacuum pumps To change the type of oil refer to the Maintenance Chapter replacement of type of oil section In all cases follow the recommendations of the pump specifier for the choice of oil to be used If necessary carry out the special preparation procedure forthe pump then remove the filling cap and fill with oil until the oil reaches the highest mark on the sight glass This operation must be performed with the pump switched off The secondfilling orifice is used if an external oil filtration device is connected To use the pump in optimum conditions the oil level must be observed and checked regularly This level is checked with the pump switched off hot and on a horizontal plane Oil level sight glass for Oil level sight glass for PC Series Pumps P Series Pumps Maximum level Maximum level Minimum level Minimum level Note Optimum pump performance and service life are obtained when the oil level is between the maximum level and the minimum level 12 Mounting on a frame Ventilation Inlet and exhaust fitting Mechanical connections For a given application pump performance vacuum characteristics temperature and reliability depe
43. tures below 59 F 15 C For the same reason and to facilitate lubrication of the pump pour a few drops of oil I to 2 cm through the inlet orifice before starting Nee that the exhaust orifice is not blocked In certain cases when the pump is started up in cold ambient conditions or with slightly contaminated oil the current after start up may remain high until the oil in the pump is heated up These conditions are sufficient for the internal thermal protection to be activated making start up impossible see pages 15 amp 16 18 Start up e When using a three phase motor check the direction of rotation ofthe motor see electrical connections start up chap page 14 Check the oil level See page 11 Start up the pump Allow the pump to run for one hour with the inlet blocked at ultimate vacuum During this operation make sure that the oil circuit is operating Remove one of the oil fill plugs to listen to the pump At start up the oil enters the lubrication circuit of the vacuum pump As a result noises will be heard first irregularly then regularly which will reduce as the oil heats up These noises will no longer be heard when the fill plug has been replaced Under normal temperature conditions the oil circuit should start less than 1 minute after start up this time may vary with the type of oil and its degree of contamination Using the gas ballast to decontaminate the pump s oil
44. y Replace the motor after inspection Check the setting Check the assembly Repeat the assembly Replace Check the installation Check for system leaks Check the exhaust line Check the voltage replace the motor Drain flush and refill with clean oil Check pump configuration or type of oil Incidents Considerable oil losses Poor pump tightness when switched off Oil in base Causes Oil level too high Operation at high pressure Gas ballast open 1 accidentally 2 pumping of condensable vapors Leak at oil case seal or at front seal Gas ballast open Safety valve damaged Incorrectanti suck backassembly O ring pinched Seals damaged Oil contaminated Oilcase andframecleaned poorly during reassembly Oil case seal pinched Front seal damaged or felt saturated 28 Corrective actions Drain and fill with new oil Use an oil recirculating kit 1 Close 2 Use acondensate collector Check the assembly and replace the seals if necessary Close Replace Repeat the assembly Replace Replace Drain flush and refill with clean oil Remove the base and clean Disassemble the oil case clean the faces and refit a new seal Replace Maintenance frequency Draining Maintenance An incorrect ultimate vacuum or a reduction in pumping speed are signs that the oil has deteriorated The periodic inspection of the state of the oil is performed by comparison
45. zed due to a stopping after pumpingin difficult conditions no draining or flushing Oil cold Insufficient oil in the oil case Oil contaminated Oil pump inlet partially blocked Lubrication holes blocked Vaneorspinner cam SD models damaged Incorrect anti suck back system assembly actions Corrective actions Checkthe power supply Reheat the pump and its oil 1 Disassemblethe motor andtry to turn the fan manually 2 Disassemble clean the pump replace seals reassemble Drain flush and refill with clean oil Replace bydisassemblingthe motor Disassemble clean hone the scratched metal parts replace them if necessary and reassemble Warm pump Fill up to the level Drain flush and refill with clean oil Drain and clean the oil pump inlet duct Disassemble and clean Replace them Repeatthe assembly andthe setting Ultimate pressure obtained a few mbar Torr Direction of motor rotation incorrect three phase Insufficient motor power Inlet filter blocked Insufficient oil in the oil case Oil cold oil pump inlet blocked Oil contaminated Oil pump inlet partially blocked One of the LP safety valves is damaged Partforgottenin reassembly 26 Rewire Checkthe power supply Clean it Add oil Warm disassemble clean Drain flush and start again with clean oil Drain and clean the oil pump inlet duct Replace Repeat the reassembly I
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