E-Tech ES series 5" close-coupled pumps - Manual (Page 7)

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The pump must supplied through a residual current
device (RCD) with a rated residual operating current ≤30
mA.
4.2 Checking the direction of rotation
After connecting the power supply, the direction of
rotation can be inverted in the 3-phase versions; in this
case, performance will be signifi cantly lower than the
nominal values. To verify a correct connection, proceed
as follows:
1) Start the electrical pump before it is installed. By
reaction, it must tend to rotate in a counter-clockwise
direction as viewed from above. Caution! This operation
will be performed dry and must not last more than a few
seconds.
2) With the electrical pump operating, installed and
submerged in the fl uid to be pumped, use a clamp
meter to measure the current absorbed. If the rotation
is incorrect, you will see values about double those
indicated on the name plate. To correct the problem, just
reverse two of the phases.
5. INSTALLING THE ELECTRICAL PUMP
m Before beginning to work on the electrical
pump, make sure that you have disconnected
the power supply from the power supply mains
and that it cannot be accidentally reconnected.
The installation of the electrical pump can involve a
certain amount of complexity. For this reason, it must be
performed by competent and authorized installers.
5.1 Delivery Pipe
The diameter of the delivery pipe depends on the fl ow
rate and pressure available at the points of use. For
installations with long lengths of delivery pipe, friction loss
can be reduced by using a pipe diameter larger than the
discharge outlet on the pump. It is advisable to install a
check valve after the discharge outlet to avoid dangerous
water hammers in the event the electrical pump should
stop suddenly. Do not use excessive force when screwing
the pipe to the discharge outlet in order to avoid damage.
The electrical pump can be installed for use with either
a metal pipe (which can be used to support it) or fl exible
tubing. In the latter case, the electrical pump must be
supported by a cable made of material with long-lasting
resistance, passing through the eyelet at its head. Fix the
power cable to the delivery pipe using suitable strap.
Caution! Do not underestimate the risk of drowning if the
installation must be performed in a well of a certain depth.
Make sure there is no danger of toxic vapours or harmful
gases in the work atmosphere.
5.2 Inserting the Electrical pump in the Well
We recommend verifying that the well is not obstructed
for its entire length.
Lower the electrical pump into the well, avoiding damage
to the electrical cable.
m Do not use the power cable to lower or support
the pump in the well.
6. MAINTENANCE AND SERVICE
The electrical pump requires no particular maintenance.
Having the electrical pump repaired by personnel who
are not authorized by the manufacturer will void the
guarantee and leave you working with equipment
that is unsafe and potentially dangerous.
m Before beginning to work on the electrical
pump, make sure that you have disconnected
the power supply from the power supply mains
and that it cannot be accidentally reconnected.
Should the cable be damaged, it is necessary to have it
replaced by the manufacturer or by authorized people.
Moreover, it is suggested to verify periodically the status
of cables and fairleads, especially on the connection
points, as well as the cleaning of the suction grate.