© Edwards Limited 2008. All rights reserved. Page 15
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Installation
B722-20-880 Issue D
3 Installation
3.1 Unpack and inspect
The pump is packed to prevent damage in transit. Take care when unpacking the pump to avoid excessive shocks
which could damage the bearings and reduce the life of the pump. The pump is supplied with the inlet and outlet
sealed to prevent entry of dust and vapour. Do not remove these seals until you are ready to install the pump on the
vacuum system.
Remove all packing materials and check the pump. If the pump is damaged, notify your supplier and the carrier in
writing within three days; state the Item Number of the pump together with your order number and your supplier’s
invoice number. Retain all packing materials for inspection. Do not use the pump if it is damaged.
Check that the package contains the items listed in Table 3. If any of these items is missing, notify your supplier in
writing within three days.
If the pump is not to be used immediately, store the pump in suitable conditions as described in Section 6.1.
Do not discard the packing materials; retain them to repack the pump when you return it for service.
3.2 Typical installation
A typical pumping system with an EXT255H 24V pump is shown in Figure 4. A typical pumping system with an EXT255Hi
24 V pump is shown in Figure 5. When necessary, purge the EXT255H/Hi 24 V pump with inert gas as described in
Section 3.5.
Typical pumping systems with an EXT70H 24 V and EXT70Hi 24 V pumps will be as shown in Figure 4 and 5, but without
the gas purge components (15, 16).
The accessories available for these EXT pumps are detailed in Section 7; the accessories are shown in Figure 7.
Safely route all vacuum, vent/purge gas and cooling-water pipelines, and all electrical cables and
wires, so that people cannot trip over them.
Table 3 - Checklist of items
Qty Description Check (9)
1 EXT turbomolecular pump
1 Inlet seal (trapped ‘O’ ring Co-Seal or copper compression gasket)
1 Inlet-strainer (EXT255Hi only: fitted in the interstage-port)
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