B344-21-880 Issue N
Page 44 © Edwards Limited 2007. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Maintenance
5.8 Replace the pump heater(s)
5.8.1 Diffstak 63/150 and 100/300 pumps
Use the following procedure to replace a heater on Diffstak 63/150 and 100/300 pumps:
1. Isolate the Diffstak from the electrical supply.
2. Refer to Figure 25. Remove the retaining screws and detach the cover from the terminal-box (1). Disconnect the
incoming electrical supply cables and the earth (ground) cable at the terminal-block.
3. Remove the nut (3) from the radiation shield/heater assembly securing stud and lower the complete radiation
shield (4) and heater assembly. Disconnect the electrical connections at the heater and remove the heater.
4. Replace the defective heater(s) (2) and reconnect the heater electrical supply cables to the terminal-block.
5. Coat the thread of the radiation shield/heater assembly securing stud with an anti-seize compound and refit the
radiation shield/heater assembly in position; make sure that the terminal-box (1) is correctly located relative to
the backing tube. Secure with the nut (3) and tighten to a torque in the range of 8 to 10 Nm.
6. Reconnect the electrical supply cables to the terminal-block. Reconnect the earth (ground) cable to the earthing
(grounding) screw. Refit the cover to the terminal-box (1).
Figure 25 - Heater assembly: Diffstak 63/150 and 100/300 pumps
1. Terminal-box
2. Heater
3. Nut
4. Radiation shield
5. Pump boiler
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