A705-40-880 Issue B
Page ii © Edwards Limited 2011. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Contents
3.12 Commission the pump ..................................................................................................29
3.12.1 Adjust the thermal snap-switch (if fitted) ..........................................................................29
3.12.2 Adjust the pump coolant jacket trip temperature (pumps fitted with a temperature transmitter, if
required) 29
3.12.3 Commissioning procedure .............................................................................................29
3.12.4 Adjust the TCV (thermostatic control-valve) .......................................................................30
4 Operation ........................................................................................ 31
4.1 Operational safety ......................................................................................................31
4.2 ATEX system control ....................................................................................................31
4.3 Non-ATEX system control ..............................................................................................32
4.3.1 Start the pump ..........................................................................................................32
4.3.2 Allow the pump to warm up ..........................................................................................32
4.3.3 Shut down the pump ...................................................................................................33
4.4 Inspect and reset the torque limiter (pumps with a torque limiter only) .....................................33
5 Maintenance ..................................................................................... 35
5.1 Safety .....................................................................................................................35
5.2 Maintenance plan .......................................................................................................35
5.3 Check the gearbox oil-level and fill the gearbox with oil (if necessary) .......................................36
5.4 Check the shaft-seals purge supply ..................................................................................37
5.5 Remove the inlet filter ................................................................................................37
5.6 Inspect the pipelines and connections ..............................................................................39
5.7 Inspect the pressure relief valve and replace the hinge bushes, flap and O-ring (if necessary): EDP250 and
EDP400 only 39
5.7.1 Remove the valve from the pump ....................................................................................39
5.7.2 Clean and inspect the valve ...........................................................................................39
5.7.3 Refit the valve to the pump ...........................................................................................40
5.7.4 Leak test the pump .....................................................................................................40
5.8 Change the pump oil and clean the oil-level sight-glasses .......................................................40
5.9 Relubricate/inspect the rotor bearings .............................................................................42
5.9.1 Introduction .............................................................................................................42
5.9.2 Remove the bearing cover and bearing caps .......................................................................43
5.9.3 Clean, inspect and relubricate the rotor bearings .................................................................43
5.9.4 Refit the bearing caps and bearing cover ...........................................................................44
5.9.5 Leak test the pump .....................................................................................................44
5.10 Check the coolant level and refill if necessary ....................................................................45
5.10.1 Refill the pump with Edwards coolant ..............................................................................45
5.10.2 Fill the pump with a different coolant ..............................................................................45
5.10.3 Check for coolant leaks ................................................................................................46
5.11 Flush the pump with cleaning solution ..............................................................................46
5.11.1 Introduction .............................................................................................................46
5.11.2 Flush a pump which has been operating ............................................................................46
5.11.3 Flush a seized pump ....................................................................................................48
5.12 Clean the cooling system ..............................................................................................51
5.12.1 Drain the coolant from the cooling system .........................................................................51
5.12.2 Clean the cooling-water filter ........................................................................................51
5.12.3 Clean the cooling-water flow indicator .............................................................................51
5.12.4 Clean the heat exchanger .............................................................................................53
5.12.5 Prepare the pump for operation .....................................................................................54
5.13 Overhaul the pump .....................................................................................................54
5.14 Replace the pressure relief valve (EDP250 and EDP400 only) ...................................................54
5.15 Inspect the torque limiter .............................................................................................54
5.15.1 Lower the pump-motor and coupling cover (without the motor change frame) ..............................54
5.15.2 Lower the pump-motor and coupling cover (with the motor change frame) ..................................55
5.15.3 Remove the coupling cover from the pump-motor ................................................................55
5.15.4 Replace the drive coupling element .................................................................................56
5.15.5 Remove the drive hub and fit to the new pump-motor (pumps without a torque limiter) ..................56
5.15.6 Remove the torque limiter and fit to the new pump-motor (pumps with a torque limiter) ................56
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