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4
Use and operation
4.1
Installing in a vacuum system
The pump can be mounted in any orientation.
Avoid throttling losses by using connecting pipes with large diameter and keep them as short as possible.
Reduce the transmission of vibration and prevent loading due to rigid pipelines. Insert elastic hoses or flexible
elements as couplings between the pump and rigid pipes.
Note:
Flexible elements tend to shrink when evacuated.
Use a suitable valve to isolate the pump from the vacuum system to allow the pump to warm up before condensable
vapours are pumped or to clean the pump before it is switched off.
Connect the exhaust to a suitable treatment plant to prevent the discharge of dangerous gases and vapours to the
surrounding atmosphere. Use a catchpot to prevent the drainage of contaminated condensate back into the pump.
4.2
Prior to use
Note:
Max. ambient temperature: 40 °C.
Make sure ventilation is adequate if pump is installed in a housing or if ambient temperature is elevated. Keep a
distance of min. 20 cm between fans and ambient parts.
When assembling, ensure vacuum-tightness. After assembly, check the complete system for leaks.
4.3
During operation
Do not start or operate the pump if pressure at the outlet is higher than 1.1 bar absolute. Attempts to start or
operate the pump at higher pressure may cause blockade and damage of the motor.
The pump achieves its pumping speed, ultimate total vacuum and vapour pumping rate only at operating
temperature (after approx. 15 minutes).
Prevent internal condensation, transfer of liquids or dust. The diaphragm and valves will be damaged, if liquids are
pumped in significant amounts.
4.3.1
Pumps with dual-voltage motor
Motor is shut down by a thermal cutout in the winding. Manual reset is necessary. Switch off the pump or isolate the
equipment from mains. Wait approx. five minutes before restarting the pump. Identify cause of failure and eliminate.
Note:
Pump starts again after power failure.
4.3.2
Pumps with 24 V dc voltage
The motor is protected by a temperature sensor at the circuit board (current limitation if the temperature at the
circuit board is higher than 70°C).
© Edwards Limited 2010. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
CAUTION
A746-02-885 Issue A
Page 15
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