S900-01-880 Issue C
Page 38 © Edwards Limited 2008. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Operation
1. Refer to the Pre-start checks (Section 4.2) and ensure that all necessary installation requirements have been
met.
2. Close the isolation valve to isolate the vacuum pumps from the vacuum system or chamber.
3. Start the backing pump.
4. When the appropriate cut-in pressure is reached, start the booster pump.
5. Operate the booster pump with the inlet blanked-off for five minutes, then check for unusual noises and
excessive vibration.
6. Continue to operate the booster pump (with the inlet blanked-off) for one hour, then check for unusual noises
and excessive vibration.
7. Open the vacuum system isolation valve, and continue to operate the booster pump at normal operating
conditions for approximately 15 minutes. After this time, check for unusual noises and excessive vibration.
8. During the first week of operation of the booster pump, check the following daily:
With the booster pump stopped, check that the oil levels are correct (in the middle of the sight-glasses).
Check that the drive system operates correctly and is undamaged.
4.4 Shutdown
Ensure that you take necessary precautions to prevent a hazardous, toxic, flammable or explosive situation in the
vacuum system, chamber, vacuum pumps, and exhaust system. Always use inert or other safe gases to purge process
gases and to vent the vacuum system. Note that by-products of the vacuum process could collect in the pump oils
and create potential hazards.
1. Close the vacuum system isolation valve to isolate the pumps from the vacuum system or chamber.
2. Shut down the booster pump.
3. Shut down the backing pump and vent the vacuum system, to avoid reverse operation. Vent the vacuum system
with a gas that will not create a hazardous, toxic, flammable or explosive situation.
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