5
EN
THE MANUFACTURER RESERVES THE RIGHT TO AMEND TECH-
NICAL DATA FOR THE PURPOSE OF PRODUCT IMPROVEMENTS
AND UPDATING.
5. PREPARING FOR USE
WARNING
TO LIFT OR MOVE THE MOTOR-DRIVEN PUMP, USE
A ROPE STRONG ENOUGH TO TAKE ITS WEIGHT,
TAKING CARE NOT TO TILT THE PUMP TOO MUCH
(MAX. 20°) (FIG. 1);
5.1. INSTALLATION
To install the pumps, proceed as directed in PART 1, chapter 7.2 and
in the following points:
– use pipes of a suitable diameter, bearing in mind that suction dia-
meter (front side of pump) is different to delivery diameter (top side
of pump), (see chap. 4).
5.1.1. FOR MOTOR-DRIVEN PUMPS 3P-3LP-3DP
Units from series 3P - 3LP - 3DP are mounted on a base. Since the units
to be installed are not particularly heavy, and loads through the pipes
are not expected to be heavy, a base plate is not essential. However, a
raised base plate would make it easier to insert a container underneath
to catch liquid when the pump casing needs draining, and would double
as a safety platform when the floor is in danger of being flooded. When
units are placed directly on the floor, all you need to do is set just the
anchor bolts in the concrete.
Although the pump and motor have been aligned at the factory, the base
plate may be distorted when the locking screws are fastened during
installation. To assure correct alignment, use a comparator or callipers
to make sure the distance between the two halves of the coupling is
the same all the way round. Using a rule or comparator, also check
alignment (concentricity) of the connector strip where the two halves of
the coupling meet. The coupling’s cover must be removed for alignment.
Make sure you have refitted it before starting the pump. Checks must be
made at four diametrically opposed points. Errors must be corrected by
loosening or removing the screws if necessary to move the feet on the
base and possibly add calibrated metal strips (FIG. 4).
IF ALIGNMENT IS NOT ACCURATE, YOU MAY ENCOUNTER VI-
BRATIONS, DAMAGE TO BEARINGS AND COUPLINGS AND THE
END OF THE SHAFT MAY BREAK.
5.2. PIPEWORK
To install pipes, proceed as directed in PART 1, chapter 7 and in the
following points:
a) do not fit the pump on misaligned pipes;
b) use a suitable support for the suction and delivery line so as not to
compromise the motor-driven pump’s alignment;
c) install a nonreturn valve between the pump and delivery gate valve
in the following cases:
– when piping is long;
– when actual head is high;
– when the pump is automatic;
– when water is pumped into the tank;
– when two or more pumps are working in parallel;
d) suction system:
1. the suction line should slope upwards (over 1/100) with respect
to the pump to stop air pockets forming. Pipe couplings must be
fastened so that air is not sucked in;
2. the suction line must be as short and straight as possible;
3. install the suction reducer as illustrated in FIG. 2 to stop air
pockets forming.
5.3. FILLING MD AND 3D PUMPS
WARNING
OPERATION TO BE PERFORMED WITH THE MO-
TOR’S TERMINAL STRIP FULLY CLOSED.
a) Unscrew the hexagonal cap located on the front of the pump casing
at the top;
b) with the aid of a funnel, fill the pump with water to overflowing;
c) screw the hexagonal cap back on until it is locked tight to prevent air
getting in.
5.4. DISASSEMBLING MOTOR-DRIVEN PUMPS (FIG.3)
The support of the 3M-MD-3D-series pump is designed to allow mainte-
nance work when needed, so that the motor assembly can be removed
without disconnecting the casing from the pipes.
To remove the 3S - 3LS - 3DS motor-driven pump’s motor, proceed
as follows:
– with the aid of a screwdriver, remove the two mesh guards (44) by
pressing towards the middle and pull them out of the slots in the
sleeve (3) (fig. 3B);
– loosen the two screws (215) securing the coupling (6) on the end
of the motor shaft – remove the screws (206) connecting the motor
flange to the sleeve flange. For pumps coupled to motors according
to construction method IM 335 (B3/B5 i.e. with flange and feet) (fig.
C and D), remove the screws for fastening to the supports.
At this point, you can remove the motor from its housing, moving it axial-
ly. Parts are refitted following the procedure in reverse order.
Apply threadlocker to grub screws (215) to prevent loosing during ope-
ration.
5.5. DISASSEMBLING MOTOR-DRIVEN PUMPS 3S-3LS-3DS (FIG. 4)
All inside parts can be disassembled and inspected without removing
the pump casing and pipes. Once you have isolated the motor-driven
pump from the system (close the gate valves, disconnect all connec-
tions, drain the pump casing), disassemble in the order given below:
– coupling cover
– motor, and mount where applicable
– mount support
– mounting unit complete with impeller and seal holder disc
parts are refitted following the procedure in reverse order.
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