BISSELL HS-20 - Manuals

ii SAFE INCORPORATION OF VARIAN DIFFUSION PUMPS INTO VACUUM SYSTEMS IS THERESPONSIBILITY OF THE SYSTEMS DESIGNER. TAKE APPROPRIATE ACTION THROUGHREDUNDANCY, AND/OR OTHER SAFEGUARDS TO PROTECT PERSONNEL AND PROPERTYFROM THE HAZARDS DESCRIBED BELOW AND IN THE INSTALLATION, OPERATION, ANDMAINTENANCE IN...

iii THE INSTALLATION, OPERATION, AND/OR SERVICING OR DIFFUSION PUMPS INVOLVES ONEOR MORE OF THE FOLLOWING HAZARDS, ANY ONE OF WHICH, IN THE ABSENCE OF SAFEOPERATING PRACTICES AND PRECAUTIONS, COULD POTENTIALLY RESULT IN DEATH ORSERIOUS HARM TO PERSONNEL. Hazard Suggested Corrective Action Loss of ut...

iv a. Explosion – Operation of the diffusion pump without prior and continuous evacuation (below 0.5 Torr (66.5 Pa)) or coolant and introducing a strong oxidizer (such as air) or explosive vapors orpowders or materials which may react with pumping fluids into a hot (above 300°F or 150°C)pump can cau...

vi 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, orcombustible mixtur...

vii 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 ga...

WARNING _____________ High voltages (up to 480 V) can kill. Always break the primary circuit tothe power supply before starting to work on the heater and/or its wiring. WARNING _____________ Diffusion pumps are typically cleaned with acetone, alcohol, or othersolvents. When heated, sprayed or expose...

List of Illustrations Figure Title Page 1-1 Speed and Throughput Curves – HS-20 Diffusion Pump . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1-2 Outline Drawing – HS-20 Diffusion Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1-3 Cooling Water Connecti...

SECTION I INSTALLATION 1-1 GENERAL Upon receipt, inspect the container for evidence of damage in shipment. Do not discard any evidence ofrough handling. Factory packing provides for maximum protection during shipment. However, the pumpshould be inspected immediately and any damage should be reported...

Installation 1-2 1-3 PHYSICAL SPECIFICATIONS (See Figure 1-2) Flange dimensions (inches): Figure 1-1. Speed and Throughput Curves – HS-20 Diffusion Pump ASA ISO 630k ISO 160k Inlet Foreline Inlet Foreline OD 27.50 9.0 27.17 7.09 ID 21.25 5.06 21.25 5.06 Thickness 1.12 0.75 0.78 0.47 Bolt Circle 25.0...

Installation 1-3 Figure 1-2. Outline Drawing – HS-20 Diffusion Pump, with ASA Flanges

Installation 1-4 1-4 UNPACKING Pumps are factory-packaged to permit prolonged storage in suitably protected areas without specialprecautions. WARNING _____________ When lifting some Varian diffusion pumps, use power-assisted equip-ment and trained moving/installation personnel to avoid dropping, sli...

Installation e. Remove all traces of the cleaning fluid by carefully drying with clean, dry, oil-free compressed air. f. For reassembly, reverse the above procedure. g. Clean the flanges and O-ring grooves thoroughly with acetone or alcohol, using clean, lintfree rags. 1-5 WARNING _____________ Diff...

Installation 1-6 WARNING Utility failure can cause damage to the equipment, overheating, andpossible explosions. Designers of the equipment using diffusion pumpsmust design their system to protect personnel and property from possi-ble hazards. 1-6 UTILITY AND SYSTEM CONNECTIONS 1-6-1 Safety Consider...

Installation 1-7 The cooling water discharge should, if possible, be connected to an open drain so that coolingwater flow can readily be checked. The temperature of the discharged cooling water shouldnot exceed 130°F (54°C). b. The quick-cool coil at the boiler plate must be connected to an open dra...

Installation 1-8 1-6-4 Electrical Connections (See Figure 1-4 and 1-5, Diffusion Pump Wiring Diagram) WARNING _____________ High voltages (up to 480V) can kill. Always break the primary circuit tothe pump before starting to work on the heater and/or its wiring. a. The pump heater has been designed t...

Installation 1-11 WARNING _____________ Pumps and their components are designed for vacuum service; theyare not designed to be pressurized which could cause them to burstpossibly expelling shrapnel at lethal velocities. Serious accidents havebeen caused by intentional pressurization of vacuum system...

Installation a. The recommended fluid charge for the pump is five U. S. quarts. The fluid charge will graduallybe depleted through use, but the pump will continue to operate normally. When the charge isreduced to approximately 60% of the initial amount, the boiler temperature may begin to riseand un...

2-1 SECTION II OPERATION During initial installation, the newly installed pump fluid may be subjected to a degassing process. Thismay result in foreline pressure fluctuations and "bursts". Such fluctuations are considered normal. 2-1 START-UP PROCEDURE a. Evacuate the diffusion pump by means...

Operation 2-2 a. Switch off the power to the diffusion pump heaters. b. Admit cooling water to the quick-cool coil if necessary and continue to circulate it until thepump body just above the boiler heat shield can be touched (approximately 130°F or 54°C).In valved systems which have tight inlet and ...

3-1 SECTION III MAINTENANCE 3-1 GENERAL Diffusion pumps generally require little attention when correctly operated. However, it is advisable toperform some periodic checks to insure continued trouble-free operation. By simple preventive main-tenance, costly down-time and cleaning procedures can be a...

Maintenance 3-2 c. When the pump is cold, check that the heaters are bolted snugly to the boiler plate and thatall heater terminal connections are tightly fastened inside the junction box. d. Check the total heater input and balance of load if a multi-phase heater is used. e. Check to insure that co...

Maintenance 3-4 Figure 3-1. External Fittings – Cold Cap Assembly NOTE ________ Customer to supply water tubing to be connected to coupling with FPTthreads shown above.

Maintenance 3-5 JET ASSEMBLY The HS-20 jet assembly consists of several subassemblies. The lower jet assembly consists of the jetbase and stages 3 and 4. A jet shield is provided for the third stage jet. The second stage jet issecured to the central tube and forms a subassembly. A shield is provided...

Maintenance 3-7 3-5-3 Reassembling the Lower Jet Assembly a Carefully replace the fourth stage jet on the jet base. b Replace the third stage jet shield. c Replace and tighten the securing screws between the third and fourth stage jets. 3-5-4 Reassembling the Jet Assembly NOTE ________ Before comple...

Maintenance 3-8 Figure 3-3 Jet Coupling Note: If the jet coupling loosens from the jet rod during disassembly, position it so that the top of the jet coupling is flush with the bottom of the orifice plug.

Maintenance 3-10 1 Determine which heater element has failed at the junction box, then disconnect the two corre-sponding leads from the terminal strip. Pull the leads out of the terminal box then out theelbow cover plate. 2 Remove the heater cover from the bottom of the diffusion pump. Move the insu...

Maintenance 3-11 3-7 REPLACEABLE PARTS The following is a list of replaceable parts for the Varian HS-20 Diffusion Pump. Part Number Description 84358301 Cold cap assembly (includes No.10-32 SST Rd Hd screw and No. 10-32 hex nut) SST 660811494 Cold cap gasket (see Figure 3-2) F2622001 Cold cap follo...

4-1 SECTION IV TROUBLESHOOTING 4-1 LEAKAGE Analysis of general operational experience with diffusion pumps indicates that certain locations aremore prone to the incidence of leaks. The following locations should be checked first if leakage is thesuspected cause of poor system performance. a. Inlet a...

Troubleshooting 4-2 Table 4-1 Troubleshooting (Cont’d) Fault Probable Cause Corrective Action Poor ultimate Contaminated pump fluid Examine and clean pump; pressure replace fluid. Low heat input Check voltage. Check for continuity, burned-out element,poor thermal contact. Inadequate cooling water fl...