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7 Servicing/Maintenance
CAUTION
Increased wear due to dry running
Damage to the pump set!
▷ Never operate the pump set without liquid fill.
▷ Never close the shut-off element in the suction line and/or supply line during
pump operation.
CAUTION
Impermissibly high temperature of fluid handled
Damage to the pump!
▷ Prolonged operation against a closed shut-off element is not permitted
(heating up of the fluid).
▷ Observe the temperature limits in the data sheet and in the section on
operating limits.
While the pump is in operation, observe and check the following:
▪ The pump must run quietly and free from vibrations at all times.
▪ Check the shaft seal.
▪ Check the static sealing elements for leakage.
▪ Check the rolling element bearings for running noises.
Vibrations, noise and an increase in current input occurring during unchanged
operating conditions indicate wear.
▪ Monitor the correct functioning of any auxiliary connections.
▪ Monitor the bearing temperature.
The bearing temperature must not exceed 90 °C (measured on the outside of the
bearing bracket).
CAUTION
Operation outside the permissible bearing temperature
Damage to the pump!
▷ The bearing temperature of the pump (set) must never exceed 90 °C (measured
on the outside of the bearing bracket).
NOTE
After commissioning, increased temperatures may occur at grease-lubricated rolling
element bearings due to the running-in process. The final bearing temperature is
only reached after a certain period of operation (up to 48 hours depending on the
conditions).
False alarm pump operation
If the pump is started up due to false alarm with no fire-fighting water being drawn,
it can be operated for a maximum of 48 hours. However, proper functioning of a by-
pass line must be ensured through which a minimum flow is pumped in order to
dissipate any excessive temperature rise.
After prolonged false-alarm operation, always dismantle the pump and inspect it for
any signs of wear or damage; if necessary, repair it by replacing any affected
components.
Etanorm FXV
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