
UNIBLOC-PD Operation & Service Manual: PD600-677 7
Pump or pump assembly must be electrically connected by authorized personnel, follow the motor instructions
supplied in case of assembly.
Never operate the pump if the front cover and/or suction/discharge pipe-work are not in place. Make sure they
are properly installed, see fig. 2.1. Likewise, never operate the pump if other protection such as coupling and
shaft guards are missing or incorrectly installed.
Never stick your appendages or other foreign objects inside the rotor housing, connections to the rotor hous
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ing, front cover or in the back cover if there is any possibility that the pump shafts may rotate.
Do not exceed the pump’s maximum operating pressure, speed or temperature. Do not modify the operating
parameters/system for which the unit was originally supplied for without first consulting your local supplier.
Pump installation and operation must always comply with prevailing health and safety regulations.
Always make sure the alignment with the drive unit is within proper tolerances. Misalignment between the
pump, drive and coupling will result in premature wear, increased operating temperature and noisier environ
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ment.
See figure 2.2 for vertical misalignment: Place shims under pump or drive; 0.25mm (0.01inch) max deviation.
See figure 2.3 for horizontal misalignment: Move pump or drive horizontally; 0.25mm (0.01inch) max deviation.
See figure 2.4 for angular misalignment: Rotate pump or drive; 1° max deviation
Avoid any direct contact with hot surfaces of the pump or drive unit. If the surface temperature of the system
exceeds 68°C (155°F), the system must be marked with a warning sign for “hot surface”.
ALWAYS DISCONNECT THE POWER SUPPLY when performing any kind of maintenance. Make sure the
power can not be switched by locking it. Allow the pump and associated parts to cool down to a safe handling
temperature.
Never operate the pump with either the suction side or the pressure side blocked.
Never operate the pump without the front cover installed properly.
Always make sure any safety/relief valves are depressurized or relieved before dismantling.
Always ensure correct rotation of pump with flow direction before start.
Installation of safety equipment to prevent pump from exceeding maximum allowable pressure is
recommended. If an integrated safety relief valve is installed, do not allow extended periods of recircu
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lation through the valve. Unibloc-Pump can either integrate a safety valve with the front cover, or supply
one as a separate unit. Please contact your supplier.
Installation of a non-return device is recommended to prevent reverse flow in the pump when it is being
turned off. Unibloc-Pump can supply a check valve as non-returning device. Please contact your suppli
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er.
Check the pump and motor assembly for adequate oil prior startup.
Make sure the pump and pipe systems are clean and free from debris or any foreign material before
start up.
Do not install the pump into a system where it may run dry (i.e. without a supply of pumped media)
fig. 2.2
fig. 2.3
fig. 2.4