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- screw/slot two guide tubes into the pedestal, securing them at the top with the spacer bracket (supplied by the

manufacturer) which serves to ensure their correct parallel alignment.
The motor pump can now be lowered into place using a galvanised chain or rope attached to the eyebolt on the top
of the motor, using the tubes as a guide, and coupled faultlessly with the pedestal.
Fig. 1 illustrates the method of installation with coupling pedestal.

4.2.2 DRY INSTALLATION WITH COOLING JACKET

If the motor pump is supplied with a cooling jacket read the booklet attached to this manual and follow the
instructions.

4.3 CONNECTION TO THE POWER SUPPLY AND DETERMINATION OF THE SENSE OF ROTATION

All operations connecting the motor pump to the electricity supply must be performed by specialised staff in full
compliance with current regulations.

WARNING:

in the electrical connection phase connect the yellow-green earth cable first, then the other

connections, as indicated in chapter 8 “ELECTRICAL CONNECTIONS”.
Check that the voltage and the frequency of the power supply are the same as those indicated on the motor pump
data plate and  that the power absorbed by the motor pump is less than the maximum current available.
Before  installation  check  that  the  power  line  is  earthed  and  complies  with  current  regulations  and  that  the  motor
pump cables are undamaged.
To protect the motor pump motor use an overload cutout  suited to the electrical characteristics shown on the data
plate.
A  diagram  illustrating  the  correct  supply  of  the  motor  pump  is  supplied  in  chapter  8  “ELECTRICAL
CONNECTIONS”.
Before making the definitive connections of three phase motors the sense of rotation of the motor pump must be
determined.
To determine the sense of rotation proceed as follows:

-  apply the provisions of paragraphs 1.2 and 1.3;
-  lay the motor pump on one side in a horizontal position and leave unrestrained;
-  connect the yellow-green earth lead and then the live leads temporarily to the solenoid switch;
-  make certain there are no persons or objects within one metre of the motor pump;
-  press the run button for a very brief period.
-  look through the inlet hole and check that the rotor rotates anticlockwise.

If the direction of rotation is not correct, invert any two phase connections at the solenoid switch and try again.
Once the rotation is correct, MARK the connection sequence of the leads.
DEACTIVATE the temporary power connection and install the motor pump in its permanent position.

4.4 INSTALLATION OF FLOAT SWITCHES

If the motor pump is fitted with a float it operates completely automatically. Check that there are no objects which
could  impede  its  movement.  It  is  very  important  to  fix  float  switches  so  that  the  cables  cannot  interfere  with  one
another, neither become twisted nor catch on projections inside the well.  Float switches should be installed in such
a  way  that  the  minimum  level  is  NEVER  lower  than  the  top  cover  of  the  motor  pump.  Float  switches  are  best
secured to a rigid bracket mounted inside the well. Once the installation of the motor pumps, control panel and float
switches is completed, carry out a final inspection to check functional efficiency. Check with an ammeter that the
motor pump current is within the limits indicated on the data plate; also that the float switches cut in at the required
level.

5. MAINTENANCE

Before inspection and maintenance operations carefully read and apply the safety procedures indicated in
paragraphs 1.2 and 1.3

WARNING:

the explosion proof layer and cable clamps of any explosion proof motor pump must not be

interfered with.
To ensure regular and long-lasting operation of the motor pump the user must perform regular inspections, periodic
maintenance  and  replacement  of  used  parts.  Monthly  inspections  are  recommended,  or  every  500-600  working
hours.

-  check that the supply voltage corresponds to the values indicated on the data plate;
-  check that noise and vibrations are at their original levels;
-  for three phase motors, use  amperimetric pincers to check the absorbances on the three phases are balanced

and do not exceed the values shown on the rating plate.
An exploded view of the motor pump is shown in fig. 2 - 2/a

5.1 CHECKING AND CHANGING THE OIL IN THE MECHANICAL SEAL CHAMBER

Before inspection and maintenance operations carefully read and apply the safety procedures indicated in

paragraphs 1.2 and 1.3
The oil should be changed every 5000-7000 working hours, or at least once a year.
The GRI - GRF - APF models are fitted with double mechanical seals and oil chamber.
Proceed as follows:
Position the motor pump horizontally.