© Edwards Limited 2014. All rights reserved. Page 23
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Operation
A301-05-880 Issue A
4 Operation
4.1 Operational safety
4.2 Start-up procedure
4.2.1 Pre-start checks
1. Check that the EH pump oil levels are correct (see Section 3.4).
2. Check that the EH pump is correctly installed, especially after initial installation and maintenance.
4.2.2 Start-up
Start up the EH pump as described in the procedure below. This procedure assumes that the EH pump and the vacuum
system are at atmospheric pressure.
1. On all of the EH1200, EH2600 and EH4200 model pumps only:
Switch on the cooling water supply and check that there is an adequate flow of cooling water at the correct
pressure (see Section 2.8).
Check the water connections for leaks.
Refer to Section 2.8 for the cooling water requirements.
2. Close all valves to atmospheric pressure and ensure that all other openings are sealed.
3. Switch on the backing pump and open the backing valve (if fitted).
4. Switch on the EH pump.
5. Allow the EH pump to run for approximately fifteen minutes to achieve normal operating temperature.
6. Slowly open the pump inlet isolation valve (if fitted).
Ensure that the cooling air flow around the EH pump and pump motor is not restricted. If the air
flow is restricted, the pump and/or motor will get hotter than normal during pump operation:
This may result in reduced reliability or the risk of an explosion.
Care should be taken not to expose parts of the body to vacuum.
During operation, parts of the EH pump can become very hot. Do not touch the EH pump.
Do not operate the EH pump with the inlet or outlet open to atmosphere. Fingers or other parts of
the body may get trapped and may be injured by the rotating pump mechanism.
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