Installation
1-5
1-4
UNPACKING
Pumps are factory-packaged to permit prolonged storage in suitably protected areas without special
precautions.
a.
Remove flange covers, blank plugs, protective plugs from water connections, etc. Be careful
not to scratch or otherwise damage or mar 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 disassembled
and cleaned. In general, cleaning may be required if the expected vacuum level is to be below
the 10
-6
Torr (.000133 Pa) range.
d.
Check the internal jet assembly. It should be concentric and firmly seated on the bottom of
the pump. The jet assembly should not rotate because of an indexing pin at the bottom.
1-5
CLEANING A NEW PUMP
a.
Read cold cap maintenance and installation data which will be found in Section III,
para. 3-4, of this manual. Remove the cold cap in accordance with these instructions.
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 gaskets if supplied.
d.
Thoroughly clean all components of the jet assembly and pump casing interior (but not
O-ring gaskets) with acetone followed by an alcohol rinse.
WARNING
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.