© Edwards Limited 2007. All rights reserved. Page 23
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Operation
A344-02-880 Issue J
4.6 Unattended operation
The pump is designed for unattended operation under the normal operating conditions specified in Section 2.
However, we recommend that you check the pump at a regular interval of not more than 14 days. Check the pump
more frequently if you pump high volumes of gas or if you operate the pump with the gas-ballast control (Figure 9,
item 4) open.
4.7 Shut-down
Note: If the gas-ballast control is open and the pump is switched off for any reason, the pump drive shaft may
rotate in the reverse direction, causing a system pressure rise. To prevent this, use a gas-ballast control
valve (refer to Section 7.4.10).
We recommend, as described in the procedure below, that you decontaminate the oil before you shut down the
pump. Decontamination of the oil will prevent damage to the pump by the contaminants in the oil.
1. Refer to Section 4.5 and decontaminate the oil, as required.
2. Close the vacuum system isolation-valve (if not already closed).
3. Turn gas-ballast control (Figure 9, item 4) clockwise to close.
4. Switch off the electrical supply to the pump.
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