Edwards 30B5M, Instruction Manual, Page: 36 / 50

B064-04-880 Issue F
Page 28 © Edwards Limited 2008. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Maintenance
5.3 Check the pump fluid-level
If the pump boiler operates at a higher than normal temperature, check the level of fluid in the pump as described
below.
1. Isolate the pump from the electrical supply, allow it to cool for at least four hours, then open it to atmosphere.
2. Refer to Figure 1 . Use the dipstick (25) to check the level of fluid. When you remove the dipstick, residual fluid
from the sides of the fluid-return pipe will be on the dipstick. Make sure that you do not confuse the fluid-level
in the boiler with the level indicated by this residual fluid.
3. If there is a high level of residual fluid on the dipstick, this indicates that there may be a blockage in the fluid-
return pipes and you must clean the fluid-return pipes and boiler as described in Section 5.4 . If there is not a
high level of residual fluid, continue at Step 4 below.
4. If the fluid-level in the boiler is low, pour more fluid into the pump. If the fluid-level is too high, remove the
drain-plug (21) and drain the excess fluid.
5. When the fluid-level is correct, check the dipstick 'O' ring. If the 'O' ring is damaged or thermal set has taken
place, replace the 'O' ring. Refit the dipstick.
6. Reconnect the pump to the electrical supply as described in Section 3 .
5.4 Clean the fluid-return pipes and boiler
5.4.1 Introduction
When you clean the pump, choose the cleaning solution to suit the type of pump fluid that has been used.
After you have cleaned the pump or any components, wash the components again with acetone to remove all traces
of the cleaning solution. Bake to 77 ºC to remove the acetone; alternatively, pass warm air over the pump or
components.
5.4.2 Clean the fluid-return pipes
Refer to Figure 1 and use the following procedure to clean the fluid-return pipes.
1. Make sure that the pump is isolated from the electrical supply, is cool and is open to atmospheric pressure.
2. Remove the dipstick (25).
3. Place a suitable container under the fluid drain-plug (21) or connect a pipe (leading to a suitable container) to
the drain connection.
4. Open the drain-plug and allow the fluid to drain out of the pump. Dispose of the fluid safely (see Section 6 ).
5. Remove the boiler end-covers and the isolator mounting-plate.
6. Remove the fluid-return pipe union blanks (23).
7. Clean the upper fluid-return pipes with a flexible drain cleaner.
8. Undo the knurled securing-ring at each end of the upper fluid-return pipe (8) connected between the backing-
condenser (4) and the boiler (19). Remove the fluid-return pipe.
9. Use a suitable tool to clean the fluid-return pipe removed in Step 8 (8) and the fluid-return pipe which is still on
the pump.
10. Replace all of the 'O' rings and seals on the items removed in Steps 2 to 9.
11. Use the knurled securing-rings removed in Step 8 to refit the upper fluid-return pipe (8).