Bissell HS-20 instruction manual Installation 1-4 UNPACKING, Cleaning A New Pump

Installation

1-4 UNPACKING

Pumps are factory-packaged to permit prolonged storage in suitably protected areas without special precautions.

WARNING

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When lifting some Varian diffusion pumps, use power-assisted equip- ment and trained moving/installation personnel to avoid dropping, slip- ping, and/or overturning the pump and severely injuring personnel. check weight of equipment before lifting and do not stand under equip- ment being moved.

a.Remove flange covers, blank plugs, protective plugs from water connections, etc. Be careful not to scratch or otherwise damage or mark the sealing surface –- usually an O-ring groove on top of the large inlet flange.

b.Carefully remove the outer shipping container and save it for evidence if damaged. Notify the carrier immediately. Visually inspect the pump for damage that may have occurred during shipping. Discard any internal packing which may have been used to protect the internal components.

c.For non-critical work, after making sure that there are no foreign materials inside the pump, it may be charged with fluid and used without disassembly. Otherwise, it should be disassem- bled and cleaned. In general, cleaning may be required if the expected vacuum level is to be below the 10-6Torr (.000133 Pa) range.

d.Check the internal jet assembly. It should be concentric and firmly seated on the bottom of the pump. Using a flashlight, check to make sure that the ejector nozzle is opposite the foreline (the pump outlet connection). The jet assembly should not rotate because of an indexing pin at the bottom.

1-5 CLEANING A NEW PUMP

a.Remove the cold cap as described in Section III, para. 3-4, of this manual.

b.Disassemble the internal jet system from the body of the pump. See Figure 3-2 for a section drawing of a typical jet assembly.

c.Remove fill and drain plugs and the sight glass with its O-ring and graphite gasket.

d.Thoroughly clean all components of the jet assembly and pump casing interior (but not O-rings) with acetone followed by an alcohol rinse.

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