Edwards nEXT200200 - Mechanical Fixing; Inlet Connection and Orientation; Base Mounting

4.3.2 Mechanical xing
WARNING: PUMP SEIZURE
Risk of injur
y and damage to equipment. Do not operate the pump unl it is correctly
installed. If the pump seizes, the stored energy of the rotor can cause fast movement
of the pump, which can cause damage and injury to people.
WARNING: INLET SCREEN
Risk of injur
y. The inlet screen is a coarse lter for debris. Do not use the inlet screen
as a nger guard.
WARNING: EJECTED PARTS FROM PUMP
Risk of injur
y and damage to equipment. Posion the system view‑ports and
vulnerable components away from the pump inlet. Failure to do so can cause damage
from the ejected parts if the pump rotor fails.
Obey one of the methods that follows to install the pumps:
▪ Install the pump through its inlet ange to a rigid, rmly xed vacuum system.
Refer to Inlet connecon and orientaon on page 35.
▪ If ins
tallaon of the pump is not possible because of the nature of the vacuum
system, install the base of the pump at a rm support. Refer to Base mounng on
page 35 for instrucons on base mounng the pump.
4.3.3 Inlet connecon and orientaon
The pump can be installed at the vacuum system through the inlet ange. You can
mount the pump in vercal and upright through to horizontal (± 2°). If the pump is
mounted horizontally and used with a rotary vane backing pump, the backing port must
point vercally down (± 20°) to decrease the risk of contaminaon from the backing
pump oil.
Make sure that the pump inlet and the components installed to the pump inlet are clean
and dust‑free. Failure to do so can increase the pump‑down me.
The inlet connecons for the pump are ISO anges:
▪ Use the manufacturer's c
ombinaon inlet screen and trapped O‑ring supplied with
the pump. Use a quanty of 8 M8 bolts to ISO898-1 strength class 12.9 (each
torqued to 20 Nm) to connect the inlet ange of the pump to the vacuum system.
Tighten all inlet ange bolts again when the system is under vacuum. Make sure that
torques or other forces are not transmied to the pump from the vacuum system or the
related pipelines.
4.3.4 Base mounng
The base of the pump can be installed on a rigid support using the tapped xing holes.
Refer to Figure: nEXT200200 dimensions (mm) on page 21 for the installaon hole
details.
Page 35
B85200880_D - Ins
tallaon