© Edwards Limited 2007. All rights reserved. Page 9
Edwards and the Edwards logo are trademarks of Edwards Limited.
Installation
A371-32-880 Issue C
3 Installation
3.1 Safety
You must ensure that the pump is suitable for your application, If you have any doubts as to the suitability of the
pump for your application, refer to the Edwards guidelines on vacuum pump and vacuum system safety (see the
Associated publication at the end of the contents list at the front of this manual).
A suitably trained and supervised technician must install your pump. Obey the safety instructions listed below when
you install the pump, especially when you connect the pump into an existing system. Details of specific safety
precautions are given at the appropriate point in the instructions.
z Wear the appropriate safety-clothing when you come into contact with contaminated components.
z Vent and purge your vacuum system before you start installation work.
z Ensure that the installation technician is familiar with the safety procedures which relate to the pump-oil
and the products handled by the pumping system. Take suitable precautions to avoid the inhalation of oil
mist and excessive skin contact with pump-oil, as prolonged exposure can be harmful.
z Disconnect the other components in the pumping system from the electrical supply so that they cannot be
operated accidentally.
z Safely route any electrical cables so that they cannot accidentally trip people.
3.2 System design
Consider the following points when you design your pumping system:
z Use a suitable valve to isolate the pump from your vacuum system if you need to allow the pump to warm up
before you pump condensable vapours or if you need to maintain vacuum when the pump is switched off.
z Avoid high levels of heat input to the pump from the process gases, otherwise the pump may overheat and
seize, and cause the motor thermal overload device to open.
z If you use the pump in a high ambient temperature and have a high gas throughput, the temperature of the
pump-body may exceed 70 °C (158 °F) and you must fit suitable guards to prevent contact with hot surfaces.
z Make sure that the exhaust pipeline cannot become blocked. If you have an exhaust- isolation valve, make
sure that you cannot operate the pump with the valve closed.
z Provide for a purge of inert gas when you shut down the pumping system, to dilute dangerous gases to safe
concentrations. A suitable gas-ballast control valve for introduction of purge gas into the pump is available
as an accessory (see Section 7.4.5).
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