Edwards nRVi, Instruction Manual

Page: 71 / 100

5. Refit the centring ring and filter assembly and the O-ring to the inlet port. Refit the
vacuum system to the pump inlet port.
Figure 16 Inlet filter assembly
1. Centring ring and filter assembly 2. O-ring
3. Inlet port
1. Centring ring and filter assembly 2. O-ring
3. Inlet port
7.2.5 Inspect and clean the gas ballast control
Refer to Figure: Gas ballast control assembly on page 68 :
Note:
The gas ballast filter element (7) is retained in its seating with adhesive; do not try to
remove it.
1. Turn the gas ballast control (1) to the high flow position (position ‘II’).
2. Push the control down against the compression spring (6) as far as it will go, then
turn the control anticlockwise slightly to release the bayonet lugs (5) and remove
the control.
3. If necessary, wipe the control with a clean, dry, lint-free cloth and check that the
airhole (3) is not blocked.
4. Refit the control into the gas-ballast inlet and ensure that the compression spring
locates correctly between the bayonet lugs.
5. Push the control down as far as it will go and turn the control clockwise slightly
until the bayonet lugs engage correctly.
6. Reset the gas ballast control to the required position.
Page 67
A65901880_D - Maintenance