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8.3
Checking the direction of rotation
8.4
Switching on the pump
75
Procedure for systems where the fluid level lies above the suction
port of the pump:
• Open the check valve on the pressure side of the pump.
• Slowly open the check valve on the suction side of the pump.
• To bleed, open the venting screw on the pressure side of the pump or
on the pump.
• Close the venting screw as soon as fluid escapes.
Procedure for systems with a non-return valve, where the fluid
level lies below the suction port of the pump:
• Close the check valve on the pressure side of the pump.
• Open the check valve on the suction side of the pump.
• Fill fluid in via a funnel until the suction line and the pump are com-
pletely filled.
CAUTION! Risk of damage to property!
Risk of damaging the pump.
• Before checking the direction of rotation and commissioning, the
pump must be filled with fluid and bled. During operation, never
close the check valves in the suction line.
The correct direction of rotation is indicated by an arrow on the pump
housing. As seen from the motor side, the pump rotates correctly in
the clockwise direction.
• To check the direction of rotation, disengage the pump from the cou-
pling.
• To check the motor, only switch on briefly. The direction of rotation
of the motor must correspond to the direction of rotation arrow on
the pump.If the direction of rotation is wrong, the electric connection
of the motor should be changed accordingly.
• After checking the direction of rotation, connect the pump to the
motor, check the coupling alignment and, if required, realign.
• Finally, remount the coupling protection.
CAUTION! Risk of damage to property!
Danger of damage of those pump parts, the lubrication of which
depends on the fluid supply.
• The pump must not be switched on when the check valves are
closed in the suction and/or pressure pipe.
• The pump may only be operated within the permissible operating
range.
After the centrifugal pump has been properly installed and also, when
aligning to the drive, all required precautionary measures have been
taken, the pump is ready for starting.
• Before starting the pump, it must be checked whether the following
preconditions have been met on the pump:
• Filling and venting lines are closed.
• The bearings are filled with the right amount of lubricant of the right
type (if applicable).
• The motor is turning in the right direction.
• The coupling protection is attached correctly and is screwed tightly.
• Pressure gauges with a suitable measuring range are installed on the
suction and pressure side of the pump. The pressure gauges must
not be installed at bends of the piping, where the measurements
could be influenced by the kinetic energy of the fluid.
• All blind flanges are removed and the check valve on the suction
side of the pump is completely opened.
• The check valve in the pressure pipe of the pump is completely
closed or only slightly opened.
WILO SE 07/2013
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