E-Tech EH series - Manual (Page 8)

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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.
c Before performing any intervention on the
electric pump make sure that the power supply
is disconnected and it can not be restored
accidentally during maintenance operations.
To protect the electric pump against frost, empty it
completely removing the drain plug and fi lling cap (see
Figure 2 B on page 5) in order to drain any fl uid outside
the pump. When the unit is commissioned again, carefully
close the drain plug and repeat the fi lling sequence from
step 3 onwards.
7. DISPOSAL
The disposal of this product, or part of it should be done
using local, public or private, systems for waste collection.
8. TROUBLESHOOTING TABLE
c Before performing any intervention on the
electric pump make sure that the power supply
is disconnected and it can not be restored
accidentally during maintenance operations.
m If the electric pump is used for liquid that are
hazardous to humans, compulsorily inform the
personnel that will perform the repair. In this
case, clean the pump, to ensure operator safety.
See table on the next page.
● The pump does not work upon start
● The motor starter thermal protection trips upon start
● The motor starter thermal protection trips occasionally
● The fl ow rate is reduced or non-constant
● The electric pump runs but does not deliver water
● The electric pump vibrates
Possible causes attributable to the electric pump Solution
█ Lack of power supply Connect the voltage
█ Blown fuses Change fuses
█ Thermal protection tripped Reset the thermal protection
█ Failure in the motor starter thermal contacts Replace the motor starter contacts
█ Faulty cable connection Fix or replace the cables
█ Mechanical block of the electric pump Remove the electric pump mechanical block
██ Calibration of the thermal relay too low Calibrate the motor starter correctly
█ Low voltage during peaks Check the power supply
█ Suction pressure too low (cavitation) Check the electric pump NPSH
██ Intake manifold / electric pump partially clogged by
impurities Clean the electric pump or the intake manifold
█ The electric pump sucks air Check the suction conditions
█ Bottom valve or check valve stuck in closed position Repair the bottom or check valve
█ Leak in the intake manifold Repair the intake manifold
█ Presence of air in the intake manifold or in the electric
pump Check the suction conditions
█ The electric pump motor rotates in the wrong direction Change the direction of rotation of the motor
█ Anchoring on the plinth defective Check and fi rmly tighten all the nuts of the
bolts of the studs
█ Foreign bodies obstructing the electric pump Have the electric pump disassembled and
clean it
█ Diffi cult rotation of the electric pump Make sure the electric pump rotates freely
without abnormal friction
█ Faulty electrical connection Check the electric pump connections