ENGLISH
8
5. ELECTRIC CONNECTION
Caution: always follow the safety regulations!
5.1 Single-
phase motors are provided with built-in thermal overload protection and may be connected directly to the mains. N.B. If the motor
is overloaded it stops automatically. Once it has cooled down it starts again automatically without any need for manual intervention.
5.2 Three-phase pumps must be protected with motor protectors suitably calibrated according to the values on the data plate of the pump to
be installed.
5.3 Do not damage or cut the power cable. If this should occur accidentally, have it repaired or replaced by skilled and qualified personnel.
6.
CHECKING THE DIRECTION OF ROTATION (for three-phase motors)
The direction of rotation must be checked each time a new installation is made.
Proceed as follows (Fig.2):
1. Place the pump on a flat surface.
2. Start the pump and stop it immediately.
3. Carefully observe the kick-back on starting, looking at the pump from the motor side. The direction of
rotation is correct, that is clockwise, if the protection cap moves as in the drawing (anti-clockwise).
If it is not possible to check as described above because the pump is already installed, check as follows:
1. Start the pump and observe the water flow rate.
2. Stop the pump, switch off the power and invert two phases on the supply line.
3. Restart the pump and check the water flow rate again.
4. Stop the pump.
The correct direction of rotation will be the one in which the flow rate and electric absorption are LOWER!
7. STARTING UP
Models with a float switch start up automatically when the water level rises; models without a float are started by means of a switch located
upstream from the socket (not supplied).
Adjusting the float switch
Lengthening or shortening the cable between the float and the fixed point (slot provided in the handle - Fig.3)
adjusts the START or STOP level of the pump. Be sure that the float can move freely.
Ensure that the stop level does not uncover the strainer.
8. PRECAUTIONS
8.1 The intake strainer must always be in place during pump operation.
8.2 The pump should not be started more than 20 times in one hour so as not to subject the motor to excessive thermal shock.
8.3 DANGER OF FROST: When the pump remains inactive for a long time at temperatures of less than 0°C, it is necessary to ensure that
there is no water residue which could freeze and cause cracking of the pump components.
8.4 If the pump has been used with substances which tend to form a deposit, rinse it after use with a powerful jet of water so as to avoid the
formation of deposits or scale which would tend to reduce the yield of the pump.
8.5
Connect pumps that are delivered without cable and/or plugs to an
external mains switch with a minimum contact gap of
0.12 " /
3 mm in all poles.
9. MAINTENANCE AND CLEANING
In normal operation, the pump does not require any specific maintenance, thanks to its mechanical seal lubricated in an oil chamber
and to its sealed-for-life bearings. The electropump must not be dismantled unless by skilled personnel in possession of the
qualifications required by the regulations in force. In any case, all repairs and maintenance jobs must be carried out only after having
disconnected the pump from the power mains.
During disassembly, pay attention to any sharp parts which could cause injury.
Checking and changing the sealing oil
To perform this operation you must unscrew the six screws of the flange (45) so as to be able
to remove the flange (105) and the outer jacket (77). Unscrew the three screws of the filter
cover (136) and remove the cover (92) and the filter (42). Unscrew the four screws of the pump
body (52) and remove the pump body (1). Using a suitable wrench, unscrew the nut (18) that
blocks the impeller, holding the impeller (4) still with your hand. Remove the impeller (4), if
necessary with the aid of levers. Recover the tab (17) and the sand protection ring (15),
unscrew and remove the cap (64). Tilt the pump so as to drain the oil out of the hole of the cap
(64)
and pour it into a container. Analyse the oil: if you find any particles of water or abrasive
materials (for example, sand) it is advisable to check the condition of the mechanical seal (16)
and to have it changed if necessary (at a specialized centre). In this case change the oil too,
with about
6 oz /
170 gr of oil type MARCOL 152 ESSO.
18
17
15
92
136
42
4
1
45
52
77
64
16
105
Fig
.
2
Fig.3
Fig.4
