Zenit GRS Manuel De Première Installation page 7

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water solutions
5. INSTALLATION
• The pump must be lowered completely into the liquid by means of a rope or a
chain anchored to the handle.
• If the pump is installed inside a well, this must have dimensions such as to
allow the float switch, if present, to move freely.
• The dimensions of the wells must be such as to avoid an excessive number of
on/off cycles of the pump and, in any case, no more than those indicated on
the specific technical data sheet of each model.
• To avoid cavitation problems caused by air suction, ensure that the entry of
fluids in the tank does not take place in close proximity of the pump and that
it is not directed towards it. Also be sure that the difference between the input
level of the fluids and the minimum allowed inside the tank is not excessive.
• The minimum level of fluid within the tank must never fall below the top cover
of the pump in order to ensure adequate cooling of the motor.
• In case of installation of models with cooling jacket or for which it is allowed
to run dry, the minimum level of fluid can fall below the top cover of the pump
but must always be above the pump body in order to avoid the formation of
vortices with a consequent entry of air.
• Check that minimum level of fluid is correct also in relation to the working point
in order to obtain a smooth operation of the pump.
• Ensure the pump does not work outside of its characteristic curve.
WARNING Pollution of the liquid could occur due to leakage of lubricants.
5.1 Free installation (Fig. 2 page 74) and fixed (Fig. 3 page 74)
Place the pump on the bottom of the tank.
If the model does not come with integrated foot supports, use the specific base
that ensures perfect stability of the pump and the correct height of the inlet.
5.1.1 Free installation (fig. 2 page 74)
By means of a hose connection connect the outlet of the pump to a flexible tube
of internal diameter of not less than that of the outlet. It is preferable to use a
pipe with reinforcing spiraling or semi-rigid type to ensure that the free passage
remains constant even in at curves or changes of direction. Secure the pipe to
the connection by means of a metal clamp.
5.1.2 Free installation (fig. 3 page 74)
Connect the pump to a metal or rigid piping. It is also possible to connect to
polyethylene pipes using a suitable fitting.
It is advisable to install a gate valve and check valve ball with integral free pas-
sage by using a connecting tube of length L> 5 Di (di = inside diameter of the
connecting tube)
5.2 Installation using external coupling device (Fig. 4 page 74)
The vertical outlet models can be installed with an external coupling device com-
posed of a fixed part and a mobile part.
The fixed part is connected to the plant tubing via the standard DN50 flange or
2" GAS thread.
The mobile part is coupled to the outlet of the electric pump via a tube section
of appropriate length.
This device enables easy separation of the electric pump from the plant and,
since no intervention is necessary on the bottom of the tank, it can also be as-
sembled without having to empty the tank.
5.3 Installation with base coupling device (Fig. 5A – 5B page 74)
This type of installation permitted for pumps with a horizontal outlet, allows you
to remove the pump from the tank and reposition it quickly without the need for
intervention on the installation.
Proceed in the following manner:
1. Secure the sliding flange to the outlet of the pump with the screws provided
with the coupling device;
2. Connect the delivery pipe of the installation to coupling device. It is advisable
to install a gate valve and check valve ball with integral free passage by using
a connecting tube of length L > 5 Di (di = inside diameter of the connecting
tube);
3. Affix the coupling device securely to bottom of the tank;
4. Insert the guide tubes into the coupling device and fix the upper end to the wall
of the tank by means of the spacer bracket supplied to ensure their parallelism
and to ensure the necessary rigidity of the system;
5. The pump must be lowered by means of a rope or chain attached to the
handle on top of the motor cover, sliding the flange coupled to the outlet of
the pump along the guide tubes until complete union with the coupling device
5.4 Dry or semi-submerged installation (fig. 6 page 74)
Installation of dry or semi-submersible pumps without a cooling jacket is
permitted only with regular intermittent operation (S3 mode) according to the
percentage specified in the label.
For installation in dry chambers, the pump is provided with the inlet flange
designed for attachment to a curved base.
5.5 Dry or semi-submerged installation with cooling jacket (fig. 7 page 74)
The cooling jacket allows continuous operation (S1) of submersible pumps, even
if partially submerged or installed in a dry chamber.
This type of application can use, as cooling fluid, the fluid from the tank if it is
sufficiently clean and free of solid bodies.
Otherwise water from an external circuit must be used.
For installation in dry chambers, the pump is provided with the inlet flange
designed for attachment to a curved base.
First installation manual – Translation of original instructions
5.5.1 Closed system cooling jacket (CC) (fig. 7A page 74)
The liquid in which the pump is immersed, thanks to the particular shape of the
rear part of the impelleris channeled into the gap between the casing and jacket,
ensuring the cooling of the engine.
Once you have filled the gap, the liquid is sucked into the pump body via a tube
and finally ejected.
WARNING This system can be used only with clean liquids that are free of solid
particles or fibrous particles.
5.5.2 Open system cooling jacket (CC) (fig. 7B page 74)
The cooling liquid which is channeled into the gap between the casing and jacket
comes from an external pressure source.
The pump has two hose connections for "Rilsan".
The attachment marked by the label "ENTRATA - IN" must be connected to the
inlet hose.
On the one labeled "USCITA - OUT", you must connect the discharge circuit.
The temperature of the coolant should not exceed 40 ° C at the entrance of the
jacket.
The capacity of the system must be 2-3 l/min and the maximum pressure must
not exceed 0.2 bar.
The cooling system must be activated at least 10 seconds before switching on
the pump and not switched off before the complete stop of the same.
6. SUCTION INLET
The suction pipe of the pump can have a grill which prevents foreign bodies
larger than the size of the free passage of the pump from entering.
It is not recommended to remove the suction grill except in cases where it is
expressly permitted.
Periodically check that the suction pipe or the grill remain free, with the aim of
preventing the clogging or blockage of the impeller.
GR models have a rotating knife with three blades that cut fine solids and fila-
ments and prevents the blockage of the impeller.
Periodically check that the knife and the plate of the shredding system are free
from residues.
During cleaning operations and maintenance, always unplug the pump from
power supply.
Work with recommended personal protective equipment and pay the utmost at-
tention.
7. INSTALLATION OF THE FLOATING SWITCHES
The electric pump can be supplied with a floating switch and its functioning is
completely automatic (fig. 8 page 74).
Make sure that there is nothing around that could obstruct the movement.
It is important that the cables do not get in each other's way, twisted up or stuck
in any jutting parts or grips inside the tank (fig. 9 A-B page 74).
If the pump does not have a start/stop floating switch, one or more start/stop
floating switches should be installed inside the tank to control starting and stop-
ping and for any alarms.
In the event of strong turbulence, floating switches should be installed on a rigid
rod mounted inside the tank (fig. 10 page 74).
The floats must be installed in such a way that the minimum level of the liquid
always remains above:
• of the upper cover when operating the pump continuous (S1);
• body pump in case of intermittent periodic operation (S3) or models with cool-
ing jacket.
After installation it is appropriate to conduct a system test to ensure its perfect
functionality.
8. ELECTRICAL CONNECTIONS (FIG. 11 – 12A/B page 75-77)
• All operations connected to the mains must be performed by qualified person-
nel, in compliance with the local regulations. Before starting work on the unit,
make sure that the unit and the control panel are isolated from the power
supply and cannot be energized. This applies to the control circuit as well.
• The electrical cable must be secured so as not to be subjected to torsion,
tearing and / or compression.
• The free ends of the cable must be connected inside an appropriate junction
box which is approved and with a degree of isolation suitable for environment
in which it is installed.
• Before installation make sure that the power line is grounded and equipped
with differential breaker in accordance with current regulations and that the
wires are not damaged in any way.
• The pump motor must be protected from overload by installing in the main
control circuit or power line of pump an overload protection (motor protection
breaker). The protection must be adequately dimensioned according to the
rated pump data. The starting current in direct-on-line start can be up to six
times higher than the rated current.
• To ensure safety the pump is to be supplied through a residual current device
(RCD) having a rated residual operating current not exceeding 30 mA.
• Appliances without plug are intended to be permanently connected to fixed
wiring; a switch that ensure the all-pole disconnection incorporated in the fixed
wiring is to be provided. The switch shall be directly connected to the supply
terminals and shall have a contact separation in all poles, providing full dis-
connection under overvoltage category III (4000V).
• Check with an ammeter that the absorption of the pumps installed is within the
limits indicated on the plate.
• The functionality and electrical safety of ZENIT pumps are guaranteed for the
configuration provided by the factory.
EN
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