© Edwards Limited 2017. All rights reserved. Page 15
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Installation
A735-01-880 Issue C
3 Installation
3.1 Safety
Ensure that the pump is suitable for the application. If in doubt, refer to the Edwards guidelines on vacuum pump
and vacuum system safety (see associated publications at the end of the contents list at the front of this manual).
A suitably trained and supervised technician must perform the installation of the pump. Obey the safety instructions
listed below, especially when connecting the pump into an existing system. Details of the specific safety precautions
are given at the appropriate point in the instructions.
Wear the appropriate safety clothing if contact with contaminated components is anticipated. Dismantle and
clean contaminated components inside a fume cupboard.
Vent and purge the vacuum system before starting installation work.
Ensure that the installation technician is familiar with the safety procedures that relate to the products
handled by the pumping system.
Disconnect the other components in the pumping system from the electrical supply to prevent accidental
operation.
3.2 System design considerations
Consider the following points when designing the pumping system:
Use a suitable valve to isolate the pump from the vacuum system if the pump needs to warm up before pumping
condensable vapours or if vacuum needs to be maintained when the pump is switched off.
Avoid high levels of heat input into the pump from the process gases, otherwise the pump may overheat and cause
the thermal protection system to operate.
Ensure that the exhaust pipeline cannot become blocked. If an exhaust isolation valve is installed, ensure that the
pump cannot be operated with the valve closed. Refer to Section 3.5.
Provide for a purge of inert gas when the pumping system is shut down, to dilute dangerous gases to safe
concentrations.
Obey the safety instructions in this section and take note of appropriate precautions. If not, injury
to people and damage to equipment can result.
Prevent any part of the human body coming into contact with the vacuum.
The Edwards nXDS pump is not recommended for pumping explosive gases or hazardous
substances.
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