EN
I-MPC Rev1 - Operating Instructions
Page 17 / 88
Air inlet
Fig. 3 Removing and cleaning the strainer
ATTENTION: do not use oil to lubricate the O-ring
seal. Use only water and neutral soap to clean the
transparent strainer cover. Do not use solvents.
After cleaning, put the strainer basket in its proper
position. Fill with water up to suction port level (see
section 8.2.1.).
Position the strainer cover properly with the O-ring seal
on the casing and tighten the handwheels uniformly.
Disinfectant or chemical products for water
treatment must not be poured directly into
the pump.
Risk of reactions and emission of harmful fumes. Risk
of corrosion in stagnant water conditions (also with an
increase in temperature and decrease of pH value).
If the event of prolonged standstill periods or
if freezing may be expected, drain the pump
completely by removing the two thumbscrew drain
plugs with reusable O-ring gaskets (fig. 4).
Fig. 4 Draining
Tighten drain plugs by hand. Do not use pliers or
other tools.
If necessary, use pliers only to unscrew. Excessive
torque may cause damage.
ATTENTION: after a long idle period, before
restarting the unit, fill the pump casing with water
and check with a screwdriver that the shaft is not
jammed.
If the shaft is jammed, dismantle the motor and remove
the cause.
9.2. Dismantling the system
Close the suction and delivery gate valves and drain
the pump casing before dismantling the pump.
9.3. Dismantling the pump
OFF
Drain the pump casing before dismantling (see fig.
4 and section 15.). For dismantling and reassembly
see construction in the cross-section drawing (section
17.).
Remove the motor assembly with the lantern bracket
(32.00) from the pump casing (14.00), after removing
the screws (14.24), the nuts (14.28) and the washers
(14.29), levering them out with two screwdrivers in
diametrically opposed positions.
To remove the impeller (28.00) insert a large straight-
blade screwdriver in the slot on the shaft (78.00) at the
ventilation end.
Grip the impeller with one hand and unscrew it, turning
the shaft counter-clockwise and twisting with both
hands (fig. 5a).
Fig. 5 Dismantling (a) and remounting (b) the impeller
If it is not possible to hold or move the shaft with the
screwdriver, remove the fan cover (90.00) and motor
fan (88.00) and unscrew the impeller by gripping the
shaft with a suitable wrench.
With the impeller the rotating part of the mechanical
seal (36.00) will be removed.
9.4. Assembling
To replace to mechanical seal (36.00) place the
rotating part of the seal on the impeller hub (28.00) and
push the spring right down as far as the front shoulder.
In this way, correct spring compression will be ensured
in subsequent assembly.
Lubricate the seal with water and align the impeller on
the motor shaft.
Grip the impeller with one hand and turn the shaft with
a screwdriver in the clockwise direction until tight.
With this operation the front surfaces of the mechanical
seal come into contact without rubbing against each
other during tightening (fig. 5b). Clean the O-ring
(14.20) and seal surfaces with water.
When replacing the motor assembly with the
impeller be careful to insert the locating lug inside
the pump casing (14.00) into the locating slot on
the diffuser cover (27.00) (fig. 6).
4.93.149
14.00
14.20
32.00
27.00
14.00
27.00
Fig. 6 Locating lug/slot for assembling pump casing
(14.00) - diffuser cover (27.00).
ATTENTION: to avoid leakage or failure due to
misalignment and localized overstressing, the screws
