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Page 13
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Installation
B777-50-880 Issue D
3.3.1
The inlet screen (supplied fitted)
CAUTION
Removal of the inlet screen could allow debris to fall into the pump, which could cause serious damage to the
pump.
CAUTION
Do not remove the three screws which retain the locking plate ('B' in
). If so, the pump settings may
change and the pump may cease to operate or have a shortened life.
Do not remove the inlet screen if there is a possibility of debris falling into the pump. If the inlet screen are removed,
the pumping speed through the inlet will increase by 11% for a coarse and 17% for a fine screen.
To remove the inlet screen, undo the three screws ('A') which hold it down (
). If the inlet screen needs
replacing, do so by undoing these screws, changing the inlet screen, and replacing the screws. Ensure that screws
are firmly tightened.
3.3.2
Inlet connection
CAUTION
The pump is able to operate up to the horizontal attitude axially. If it is mounted off-vertical, ensure that the
backing port is within 60° of vertical. Refer to
.
Ensure that the EXT556H pump is securely fixed to the vacuum system following the instructions below.
Make sure that the pump inlet and all components fitted to the pump inlet are clean and dust free. If the pump inlet
is not kept clean the pump down time may be increased. Use the vacuum seal provided with the pump.
When using an EXT556H ISO160 pump, connect it to the vacuum system using an ISO160 rotatable flange with a full
complement of bolts. Alternatively use at least 8 claw clamps.
When using an EXT556H DN160CF, use a full complement of 20 M8 bolts to attach the pump to the vacuum system.
If the inlet flange of the EXT556H is not connected to a rigid, firmly fixed vacuum system, ensure that the base of
the pump is fixed to a firm support. Remove the four feet and secure the pump using eight M8 bolts through the
tapped fixing holes in the base of the pump. These bolts should be in ISO 898-1 class 8.8 or higher, and should be
tightened up to approximately 7Nm torque. When using a WCX555 water cooling accessory, mount through the
cooling plate into the tapped holes on the base of the pump.
If the pump inlet is connected to the vacuum system using a vibration isolator, use the tapped fixing holes in the base
of the pump to secure the pump to a firm support as described above. Alternatively, fit suitable restraints to prevent
movement of the pump and fracture of the vibration isolator in the unlikely event of a seizure of the pump rotor.
WARNING
Removal of inlet screen will expose people to the risk of injury from sharp edges.
WARNING
Ensure that the EXT556H pump is securely fixed to the vacuum system following the instructions
below. If not, and the pump seizes, the stored energy of the rotor can cause rapid movement of
the pump, which may cause injury to people and further damage to equipment.