Maintenance; Replacing The Motor - FLYGT PX SERIE Instrucciones De Instalacion Y Uso

en
WARNING
WARNING
If the pump is exposed to freezing temperatures, drain it when not in use, unless a suitable anti-freeze
has been added to the liquid.

7. Maintenance

The pump does not require specific inspections at regular intervals.
As a precaution, however, we recommend that you carry out some or all of the following checks at vary-
ing intervals depending on the operating conditions:
Leaks
Operating pressure
Thermal protector activation
No. of starts per hour
Noisy operation
If any malfunctions are found, refer to section 8 for possible causes and remedies.
The pump does not require any scheduled routine maintenance. It may require extraordinary mainte-
nance which generally involves cleaning the liquid end or replacing the mechanical seal or other worn
parts. In this case, please refer to our maintenance manual.
To facilitate connection or motor replacement, use the fork-shaped fitting plate supplied both with the
pump and electric pump (see sections 7.1 and 7.2).
7.1 Pump-motor coupling
If only the pump is purchased, it is supplied with the fork-shaped fitting plate (fig. 8, page 110) positioned
between the adapter and drive coupling to keep the impeller pack correctly aligned.
WARNING
To avoid damage during shipping, the pump shaft is locked in position by a strip of polyurethane and two
plastic straps.
For coupling to the motor, follow the instructions below:
1 - Remove the coupling protections using a screwdriver and a pair of long-nose pliers, exerting a slight
pressure towards one side of the coupling.
2 - Remove the polyurethane strip.
3 - Loosen the 4 coupling screws.
4 - Ensure that the fork-shaped fitting plate is positioned between the coupling and the adapter (Fig. 8 page
110).
5 - Fit the motor with the terminal board box facing whichever side makes it easiest to connect the power
supply cables; first tighten the screws on the flange and then those on the coupling. The recommended
torque wrench setting is given in table 1, page 106.
6 - Remove the fitting plate and replace the coupling protections.

7.2 Replacing the motor

After removing the coupling protections, position the fork-shaped fitting plate between the coupling and
the adapter (fig. 8, page 110) before loosening the coupling screws. Then replace the motor. If you do
not have the fork-shaped fitting plate, use a 5 ± 0.1 mm shim.
22
Avoid prolonged operation with the delivery on-off valve closed unless the sys-
tem is provided with a suitable by-pass. Prolonged operation with the delivery
on-off valve closed will cause the liquid to overheat.
On pressure boosting systems in particular, it is necessary to regulate the con-
trol equipment to avoid too many start-ups per hour. The maximum number per-
mitted is indicated in section 4.
In this case use standard balanced motors without tongue according to ISO
8821 ("N" letter on the shaft end).