© Edwards Limited 2014. All rights reserved. Page 15
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Installation
A366-04-880 Issue A
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. You must use flexible bellows if your pump is mounted on vibration isolators. We recommend that
you use Edwards flexible bellows.
Use a suitable valve to isolate the pump from your vacuum system if you need to pump condensable vapours
or maintain vacuum when the pump is switched off.
Use a suitable inlet catchpot if you pump condensable vapours or if you use the pump for very dusty
applications.
Ensure that sealing surfaces are clean and scratch-free.
3.9 Connect the pump outlet to your system
Connect the pump outlet-port to your outlet accessories or your exhaust treatment plant using standard fittings to
connect to the ISO40 flange.
Take note of the following information before you connect to the pump outlet. Refer to Section 7 for details of the
accessories mentioned below.
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.
In the following circumstances, we recommend that you fit an oil mist filter to the pump outlet:
if you use the pump with the gas-ballast control open
if you operate the pump with an inlet pressure greater than 10 mbar for extended periods or
if you frequently pump down from atmospheric pressure.
The mist filter will trap the oil exhausted from the pump: you can re-use the oil if it is not contaminated.
3.10 Gas-ballast inlet connection
As shown in Figure 6 (item 3), the pump has two gas-ballast inlets. We supply the pump with a blanking plug fitted
to one inlet: the other inlet is open. You can use either of the inlets, but you must fit the blanking plug to the inlet
you do not use.
You can leave the gas-ballast inlet open to the atmosphere. Alternatively, you can fit a gas-ballast control-valve,
(available as an accessory, refer to Section 7), for remote control of the gas-ballast supply. In either case, adjust the
gas-ballast control (Figure 6, item 5), to regulate the flow rate of the gas-ballast supply.
For more information about the use of gas-ballast, refer to Section 1.3 and 4.1.
3.11 Leak-test the system
Leak-test the system and seal any leaks found after you have installed the pump, to prevent leakage of substances
out of the system and leakage of air into the system.
Connect the pump outlet 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.
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