Edwards RV3 Instruction Manual

3. Turn the mode selector to select High Vacuum mode S and close the gas-ballast
control (posion ‘0’).
Open the vacuum system isolaon-valve and pump down to ulmate vacuum.
5.5 To pump condensable vapours
Use gas-ballast (gas-ballast control in posion ‘I’ or ‘II’) when there is a high proporon
of condensable vapours in the process gases.
1.
Close the vacuum system isolaon-valve.
2.
Turn the mode selector fully clockwise to select High Vacuum mode S or fully
anclockwise to select High Throughput mode S, as required (refer to Mode
selector on page 36).
3.
Turn the gas-ballast control to high ow (posion ‘II’) and operate the pump for
30 minutes to warm the oil; this will help to prevent vapour condensaon in the
pump.
4.
Set the gas-ballast control to the posion required for the applicaon (refer to Gas-
ballast control on page 36 and the data in Table: Performance data- High Vacuum
mode and Table: Performance data- High throughput mode).
5.
Open the vacuum system isolaon-valve.
Aer pumping condensable vapours, decontaminate the oil if necessary: use the
procedure in To decontaminate the oil on page 38.
5.6 To decontaminate the oil
The oil in the pump should be clear; if the oil is cloudy or discoloured, it is contaminated
with process vapours.
1.
Look at the condion of the oil in the oil-level sight-glass (Figure: The RV pump,
item 8). If the oil is cloudy or discoloured, connue with the procedure at Step 2
below.
2. Close the vacuum system isolaon-valve.
3.
Turn the mode selector fully anclockwise to select High Throughput mode S. Set
the gas-ballast control to low ow (posion ‘I’).
4. Operate the pump unl the oil is clear.
5.7 Unaended operaon
The RV pump is designed for unaended operaon under the normal operang
condions specied in Operang and storage condions on page 13. However, we
recommend checking the pump at regular intervals of not more than 14 days, or more
frequently if pumping high volumes of gas or vapour.
On single-phase pumps, the motor is protected by an overload device which isolates the
pump from the electrical supply when crical temperature or current levels are
exceeded. The overload device resets automacally when the motor has cooled. When
checking the pump, make sure that the pump is not going through a repeve cycle of
thermal overload failures and automac resets. If necessary, change the mode selector
to High Throughput mode S and reduce the thermal load from the pumped gases, to
prevent overheang of the pump.
03/2021 - ©Edwards Limited
Page 38A65201880_AA
A65201880_AA - Operaon

Edwards RV3 Specifications

General

Brand	Edwards
Model	RV3
Category	Water Pump
Language	English