A371-32-880 Issue C
Page 12 © Edwards Limited 2007. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Installation
Take note of the following information when you connect the pump to your vacuum system. Refer to Section 7 for
details of the accessories mentioned below.
z For optimum pumping speeds, ensure that the pipeline connected to the inlet-port is as short as possible and
has an internal diameter not less than the inlet-port diameter.
z Support the vacuum pipelines to prevent loading of the coupling-joints.
z If necessary, incorporate flexible bellows in your system pipelines to reduce the transmission of vibration and
to prevent loading of coupling-joints. If you use flexible bellows, you must ensure that you use bellows which
have a maximum pressure rating which is greater than the highest pressure that can be generated in your
system. We recommend that you use Edwards flexible bellows.
z Use a suitable inlet-filter if you pump condensable vapours or if you use the pump for very dusty
applications.
z Use a suitable valve to isolate the pump from your vacuum system if you need to pump condensable vapours
or to maintain vacuum when the pump is switched off.
z Ensure that sealing surfaces are clean and scratch-free.
3.7.2 Side inlet-port connection
A side inlet-port is available, refer to Figure 1. To use the side inlet-port, use the following procedure.
1. Carefully remove the side panel (11) from the pump: use a suitable flat blade screwdriver or similar tool for this
purpose. The panel is located by two nylon rivets.
2. Unscrew and remove the blanking plug with its o-ring.
3. Unscrew and remove the adaptor flange and its o-ring and replace it with the blanking plug and o-ring that you
removed in Step 2.
4. Screw the adaptor flange and its o-ring into the side inlet-port.
3.8 Pump outlet connection
To connect the pump to your outlet accessories or to your exhaust treatment plant, you can:
z Connect 10 mm internal diameter vacuum hose or 12 mm internal diameter plastic hose to the outlet nozzle
(Figure 1, item 5).
z Remove the outlet nozzle and connect to the 3/8 inch BSP tapped hole.
z Remove the outlet nozzle and replace it with an NW25 flange adaptor (available as an optional accessory, see
Section 7) and then connect to the NW25 flange.
Take note of the following information before you connect to the pump outlet:
z The exhaust system must be configured so that the maximum pressure at the pump outlet does not exceed
0.5 bar gauge (1.5 bar absolute, 1.5 x 10
5
Pa) at full pump throughput.
z In the following circumstances, we recommend that you fit an oil mist filter to the pump outlet
z if you use the pump with the gas-ballast control open
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