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Bissell HS-20 instruction manual Maintenance, 3-12

Models: HS-20

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Troubleshooting Specifications Install 5. 380/415 V Wiring Diagram - HS-20 Diffusion Pump Warranty Replacement and Adjustment Maintenance i. Cold Coolant - Liquid nitrogen, a cryogenic liquid, is used in traps. If it is splashed on body tis- sues or eyes, it can cause severe frostbite or blindness. The extremely low temperature of lique- fied nitrogen can cause skin damage similar to high temperature burns. Contact with the cold gas evolving from the liquid may produce the same effect. Delicate tissues, such as the eye tissues, are most easily damaged by exposure to cold gas or liquid. To minimize the risk of hazardous con- tact of cold gaseous nitrogen with any part of the body, wear personal safety equipment recom- mended for use with cryogenic materials including face shield, full-sleeved lab coat, and clean, dry gloves which fit loosely so they can be thrown off quickly if frozen by contact with the gas 6. Sight Glass Assembly Start-Up Procedure Three elements are required fuel, oxidizer, and source of ignition. A combination of temperature and pressure can be a source of ignition. Most diffusion pump fluids except mercury are fuels. Hydrocarbon oils are more prone to oxidize and explode than synthetic silicone-based oil. Oxidizer can be air a strong oxidizer from a leak or can be deliberately introduced in a process or can be inadvertently admitted to the system by operator or process controller error. Oxygen and other strong oxidizers are even more dangerous. Certain conditions of temperature and pressure can cause a combustible mix- ture to explode. The larger the diffusion pump, the greater the risk of explosion and the greater the risk of damage and/or injury. Never operate diffusion pumps larger than 10 inches in diameter with hydro- carbon oils without a complete safety analysis for the complete system and application. Never operate any diffusion pump in the following ways because they increase the probability of an explosion

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Maintenance

3-12

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Bissell HS-20 instruction manual Maintenance, 3-12

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Contents

Instruction Manual HS-20 Diffusion PumpVarian Vacuum Technologies 121 Hartwell Avenue Lexington, MA 781861-7200Avda Pedro Diez Sales and Service Offices716 Yishan Road Shanghai FAX Numbers Telephone NumbersContinental U.S. only - 1-800-8-VARIAN Hawaii and Alaska3/5/97 WarrantyWarranty Replacement and Adjustment OPERATION AND MAINTENANCE OF THIS EQUIPMENT INVOLVES SERIOUS RISK. IT IS THE RESPONSIBILITY OF THE USER TO MAINTAIN SAFE OPERATING CONDITIONS AT ALL TIMES. VARIAN ASSUMES NO LIABILITY FOR PERSONAL INJURY OR DAMAGE RESULTING FROM OPERATION OR SERVICE OF THE EQUIPMENT SAFE INCORPORATION OF VARIAN DIFFUSION PUMPS INTO VACUUM SYSTEMS IS THE RESPONSIBILITY OF THE SYSTEMS DESIGNER. TAKE APPROPRIATE ACTION THROUGH REDUNDANCY, AND/OR OTHER SAFEGUARDS TO PROTECT PERSONNEL AND PROPERTY FROM THE HAZARDS DESCRIBED BELOW AND IN THE INSTALLATION, OPERATION, AND MAINTENANCE INSTRUCTION MANUAL. SAFE OPERATION IS THE RESPONSIBILITY OF THE USING ORGANIZATION AND ITS PERSONNEL. READ THE INSTRUCTION MANUAL AND UNDERSTAND HOW TO AVOID HAZARDS PRIOR TO OPERATING THE DIFFUSION PUMP. ALL PERSONS WHO WORK WITH OR ARE EXPOSED TO DIFFUSION PUMPS OR EQUIPMENT WHICH UTILIZES SUCH PUMPS OR DIFFUSION PUMP FLUID MUST TAKE PRECAUTIONS TO PROTECT THEMSELVES AGAINST POSSIBLE SERIOUS BODILY INJURY OR DEATH. DO NOT BE CARELESS AROUND SUCH PRODUCTS Loss of utility water and/or electricity Three elements are required fuel, oxidizer, and source of ignition. A combination of temperature and pressure can be a source of ignition. Most diffusion pump fluids except mercury are fuels. Hydrocarbon oils are more prone to oxidize and explode than synthetic silicone-based oil. Oxidizer can be air a strong oxidizer from a leak or can be deliberately introduced in a process or can be inadvertently admitted to the system by operator or process controller error. Oxygen and other strong oxidizers are even more dangerous. Certain conditions of temperature and pressure can cause a combustible mix- ture to explode. The larger the diffusion pump, the greater the risk of explosion and the greater the risk of damage and/or injury. Never operate diffusion pumps larger than 10 inches in diameter with hydro- carbon oils without a complete safety analysis for the complete system and application. Never operate any diffusion pump in the following ways because they increase the probability of an explosion Contaminate pump with explosive vapors d. Poisonous and/or Corrosive Compounds - When pumping poisonous, reactive, and/or corro- sive gas, vapors, or chemicals, even proper operation and regeneration will not always ensure that all hazardous materials have been totally removed. If hazardous gas, vapors, chemicals, or combustible mixtures are pumped, sufficient quantities may exist during operation or remain after regeneration to cause severe injury or death. Overheating the pump oil, exposing it to air or reac- tive materials, or overpressurizing it above the normal operating range approximately 1 mTorr .133 Pa will decompose the oil and possibly make it toxic. This is especially true of back- streamed mechanical pump oils which are more volatile unstable. Overheating of accidentally introduced or backstreamed mechanical pump oils cannot be protected against by thermal switch- es which are set for diffusion pump oil i. Cold Coolant - Liquid nitrogen, a cryogenic liquid, is used in traps. If it is splashed on body tis- sues or eyes, it can cause severe frostbite or blindness. The extremely low temperature of lique- fied nitrogen can cause skin damage similar to high temperature burns. Contact with the cold gas evolving from the liquid may produce the same effect. Delicate tissues, such as the eye tissues, are most easily damaged by exposure to cold gas or liquid. To minimize the risk of hazardous con- tact of cold gaseous nitrogen with any part of the body, wear personal safety equipment recom- mended for use with cryogenic materials including face shield, full-sleeved lab coat, and clean, dry gloves which fit loosely so they can be thrown off quickly if frozen by contact with the gas Page Page Safety Considerations Table of ContentsSection I - Installation SectionList of Tables List of Illustrations1-2 OPERATING SPECIFICATIONS See Figure INSTALLATION 1-1 GENERALTechnical Specifications SECTIONPHYSICAL SPECIFICATIONS See Figure InstallationSwitches WeightFigure 1-2. Outline Drawing - HS-20 Diffusion Pump, with ASA Flanges Installation1-5 CLEANING A NEW PUMP Installation 1-4 UNPACKINGInstallation 1-6-1 Safety Considerations and Interlocks Installation 1-6 UTILITY AND SYSTEM CONNECTIONS1-6-2 Vacuum Connections 1-6-3 Cooling Water Connections See FigureFigure 1-3. Cooling Water Connections InstallationInstallation 1-6-5 Thermal Switches1-6-6 Initial Vacuum Test Installation 1-10 InstallationFigure 1-5. 380/415 V Wiring Diagram - HS-20 Diffusion Pump Pumps and their components are designed for vacuum service they are not designed to be pressurized which could cause them to burst possibly expelling shrapnel at lethal velocities. Serious accidents have been caused by intentional pressurization of vacuum systems and their components. Never pressurize any part of a vacuum system for test or any other purpose. Always provide pressure relief when designing diffusion pumps into systems and ensure that pressure relief motion is limited to safe envelopes 1-7 ADDING PUMP FLUIDInstallation Figure 1-6. Sight Glass Assembly InstallationSECTION 2-1 START-UP PROCEDUREOPERATION Operation 2-2 SHUTDOWN PROCEDURESECTION MAINTENANCE 3-1 GENERAL3-2 PERIODIC INSPECTION 3-3 CLEANING MaintenanceDo not overtighten the screw 3-4 DISASSEMBLING AND REASSEMBLING THE COLD CAP Refer to FigureMaintenance c. Drain the pump of all fluidFigure 3-1. External Fittings - Cold Cap Assembly Maintenance3-5-2 Disassembling the Lower Jet Assembly Maintenance 3-5 JET ASSEMBLY3-5-1 Disassembling the Jet Assembly Refer to Figure Figure 3-2. 20-inch Jet Assembly Maintenance3-6 HEATER REPLACEMENT Maintenance 3-5-3 Reassembling the Lower Jet Assembly3-5-4 Reassembling the Jet Assembly Figure 3-3 Jet Coupling MaintenanceTighten clamping nuts to 250 in.-lbs MaintenanceFigure 3-4. Heater Element Assembly Maintenance Maintenance 3-7 REPLACEABLE PARTSPart Number Description3-12 Maintenance4-2 OUTGASSING TROUBLESHOOTING 4-1 LEAKAGE4-3 POOR PUMP OR SYSTEM PERFORMANCE SECTIONTable 4-1 Troubleshooting Cont’d Troubleshooting