Installation With Coupling Foot; Dry Installation With Cooling Jacket; Pump Inlet; Connection To The Power Mains And Determination Of The Rotation Direction - Zenit DGN 250/2/G65V A1DM/50 Manuel D'utilisation Et D'entretien

Before placing three-phase electric pumps, check the rotation direction, following the instructions in paragraph 4.3.
The pumps can be set up either for mobile use, fitted to a base plate accessory, or in fixed posts. If free-standing, the electric
pump outlet must be connected by an elbow and union to a flexible hose whose diameter must not be smaller than the electric
pump outlet diameter. The hose should preferably be of the type with a spiral reinforcement in order to ensure a smooth flow of
the liquid around bends or changes in direction. If fixed, the electric pump should be connected to a metal pipe, incorporating a
check valve with free return flow and a gate shutoff valve. In this instance the stability of the electric pump is assured by the rigid
pipe.

4.2.1 INSTALLATION WITH COUPLING FOOT

This type of installation is envisaged for all types of submersible electric pumps with a horizontal inlet.
Electric pumps with an automatic coupling foot are the most suitable for fixed installations as they allow easy maintenance and
cleaning without draining the liquid collection tank or undoing any bolts. For electric pumps where this option is provided (contact
ZENIT for information), proceed as follows:
1. First fasten the coupling foot with coupling base at the bottom of the tank using expansion bolts, making sure the guide pipes
(to be fitted later on, as outlined in point 3) are resting on the free edge of the cover, where the pump will be lowered.
2. install the delivery pipe with the check valve and gate shutoff valve;
3. screw/slot two guide pipes on the coupling foot, fixing them in the upper part using the spacer bracket provided by the
manufacturer; this will ensure they are kept parallel;
The electric pump can now be lowered into place using a galvanised chain or rope hooked around the eyelet or handle on the top of
the motor cover and, thanks to the two guide pipes, it will fit perfectly in place on the foot.
Fig. 1 on page 76 shows the installation diagram for use with the coupling foot.
4.2.2

DRY INSTALLATION WITH COOLING JACKET

If the electric pump is supplied with a cooling jacket, read the booklet enclosed with this manual and follow the instructions.

4.2.3 PUMP INLET

The pump inlet may have a suitably-sized grating fitted on it to ensure no foreign matter larger than the pump's passageway can
enter the unit. Do not remove the grating and make sure it is always kept clear, to prevent damage and reduced pump performance.

4.3 CONNECTION TO THE POWER MAINS AND DETERMINATION OF THE ROTATION DIRECTION

All the operations involved in the connection to the power mains must be carried out by qualified technical staff, as stated in chapter
1.The loose ends of the cable must be connected with a suitable junction box when the connections made in a potentially explosive
area or with a normal casing if the connection is in a safe area. Whatever the case, all connections must comply with the installation
regulations in force.
WARNING: when wiring up the unit, connect the yellow-green earth lead first, then the other leads, as indicated in chapter 8
"ELECTRICAL CONNECTIONS".
Check that the power supply voltage and frequency match the ratings indicated on the electric pump data plate and that the power
absorbed by the electric pump is less than the maximum current available.
When wiring up single-phase pumps, the condenser and the circuit breaker condenser, if fitted, must be connected by the user in an
area where there is no risk of it being triggered.
Before installation, check that the power line is earthed and complies with current regulations and that the electric pump cables are
undamaged.
To protect the electric pump motor, use a suitable overload cut-out for the electrical specifications stated on the data plate.
A diagram illustrating the correct power supply for the electric pump can be found in chapter 8 "ELECTRICAL CONNECTIONS".
Before making the definitive three-phase connection, the electric pump rotation direction must be determined.
To determine the rotation direction, proceed as follows:
- apply the procedures of paragraphs 1.2 and 1.3;
- lay the electric pump on one side in a horizontal position and leave it unrestrained;
- temporarily connect the yellow-green lead to earth and then the live wires to the remote control switch;
- make certain there are no persons or objects within one metre of the electric pump;
- press the run button for a few seconds;
- look through the inlet to check that the rotor is rotating anticlockwise. We recommend you switch off the pump to check the
rotation direction, so that you can observe the rotor when it is coming to a stop.
If the rotation direction is not correct, invert the connection of two of the three leads at the remote control switch and try again. Once
the rotation is correct, MARK the connection sequence of the leads. DISCONNECT the temporary power supply and install the
electric pump in its permanent position.

4.4 INSTALLATION OF FLOATING SWITCHES

If the electric pump is fitted with a float, it operates completely automatically. Check that there are no objects which could impede its
movement. It is very important to fix floating switches, so that their cables cannot interfere with one another, become twisted or
catch on any protrusions inside the well. Floating switches should be installed in such a way that the minimum level is NEVER lower
than:
- the top cover of the electric pump, in case of continuous working (S1)
- the pump body top, in case of discontinuous working (S3); in this case the pump MUST be timed (see percentage S3).
Floating switches are best secured to a rigid rod mounted inside the well. Once the installation of the electric pumps, electric
panels and floating switches is complete, carry out a final inspection to check operation. Check with an ammeter that the power
absorbed by the pumps is within the limits indicated on the data plate and that the floating switches are triggered at the required
level.
15