A708-01-880 Issue E
Page 50 © Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Maintenance
5.4 Check the shaft-seals purge gas supply
1. Inspect the shaft-seals purge gas supply pipelines and connections; check that they are not corroded or
damaged. Replace any of the pipelines and connections that are corroded or damaged.
2. Check that all of the shaft-seals purge gas supply connections are secure. Tighten any loose connections.
3. Check that the purge gas supply can still provide the necessary pressure as specified in Section 2.6.
5.5 Check the coolant level and refill if necessary
5.5.1 Check the coolant level
Note: To refill the pump with Edwards coolant, new coolant is required, available as a spare: refer to Section 7.3.
1. If the pump is operating, shut down the pump: (refer to Section 4) and allow the pump to cool.
2. Refer to Figure 7, detail B. Wear thermal protective gloves and push down the coolant filler cap (6) and turn it
anticlockwise by a
¼ of a turn to release the pressure in the cooling-jacket.
3. Turn the coolant filler cap (6) anticlockwise and remove it from the heat exchanger (2).
4. Remove any dirt or water-scale from the seal of the filler cap (6) and from the filler tube (5).
5. Look at the level of coolant in the coolant level sight-glass (3):
z If the coolant level is below the minimum level, continue at Step 6.
z Otherwise, continue at Step 8 of Section 5.5.2.
6. When refilling the pump:
z To r e f i l l a p um p c o n t a i n i n g E d w a r d s coolant with the same type Edwards coolant, continue at Step 4 of
Section 3.4.
z To r e f i l l a p um p c o n t a i n i n g E d w a r d s c o o l a nt w i t h a different coolant, drain the pump and continue at
Section 5.5.2.
z To r e f i l l a p um p c o n ta i n i n g a d i f f e r e n t c o o l an t w i th t h e s a m e t y p e c oo l a n t , c o n t i nue a t St e p 5 o f
Section 5.5.2.
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