Noise Level; Installation; Shipping; Placement - Zenit DRO 50/2/G32V A0CM-E Manuel D'utilisation Et D'entretien

Wells and collection tanks: the dimensions of wells and tanks should be such as to avoid an excessive number of start-ups
per hour .
To safeguard the motor, the level of the liquid must never be allowed to fall below the cover of the motor pump's motor.
- Protection category IP 68
- Field of application: drainage and/or transfer of sewage.
- Service factor: S1 (CEI 2-3).
Make sure that the motor pump is not operated outside its characteristic curve.
These motor pumps are not suitable for manipulating liquids for nutritional use.
These motor pumps may not be used in tanks or other locations in which the machine may come into contact with parts of the
body.

3.2 NOISE LEVEL

Submergible motor pumps present acoustic pressure levels of less than 70 dB(A) when immersed and in any case less than
80 dB if installed dry.

4. INSTALLATION

4.1 SHIPPING

Before installation read and apply the safety procedures in paragraphs 1.2 and 1.3 carefully.
Mass according to table 1 - 1/a - 1/b - 1/c on page 75 - 76 - 77.
For motor pumps weighing 30 kg or less moving and lifting may be performed manually using the handle fitted on the
upper part of the motor pump. For motor pumps weighing more than 30 kg moving and lifting must be done using a
suitable mechanical device according to the weight of the motor pump.
NEVER use the power cable or the float cable to lift and move the unit. Use the appropriate handle or lifting hook.
Make a visual inspection of the packing and its contents to ensure that no damage has occurred. If there is any sign of
significant damage, contact Zenit without delay.
Check that the specifications indicated on the data plate are as required.
Before making any power connections or installing the motor pump, turn the shaft with the box wrench to ensure that it
rotates freely.

4.2 PLACEMENT

Before installation read and apply the safety procedures in paragraphs 1.2 and 1.3 carefully.
The operations of installing motor pumps and making connections to the electrical power supply must be carried out by a
skilled technician.
Always check that the motor pump is not connected to the electricity supply before performing any operations on it.
Before placing the motor pump, for three-phase motors check the sens of rotation following the instructions in paragraph 4.3
Motor pumps can be free-standing or fixed. If free-standing, the motor pump outlet must be connected by an elbow and
union to a flexible hose the diameter of which must not be smaller than the motor pump outlet. Preferably, the hose should
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 motor 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 motor pump is assured by the rigid pipe.

4.2.1 INSTALLATION WITH COUPLING PEDESTAL

This type of installation is envisaged for all types of submersible motor pumps with a horizontal inlet.
Motor pumps with automatic coupling pedestal 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 motor pumps where this option is provided (contact Zenit for information), proceed as follows:
- secure the pedestal and bend to the bottom of the tank with bolts and expanding plugs.
- install the delivery pipeline with the check valve and gate valve;
- screw/slot two guide tubes into the pedestal, securing them at the top with the spacer bracket (supplied by the
manufacturer) which serves to ensure their correct parallel alignment.
The motor pump can now be lowered into place using a galvanised chain or rope attached to the eyebolt on the top of the
motor, using the tubes as a guide, and coupled faultlessly with the pedestal.
Fig. 1 on page 83 illustrates the method of installation with coupling pedestal.

4.2.2 INSTALLATION WITH EXTERNAL COUPLING DEVICE

For fixed installations, motor pumps with a vertical outlet can be fitted with an external coupling device comprising a fixed
part, fitted to the outlet using either a standard DN 50 flange or BSP 2" thread, and a movable part which is screwed onto the
delivery pipeline (having first established the length). This device does not require any anchorages at the bottom of the tank,
and can therefore be fitted even when the tank is full.
Fig. 1/a on page 83 illustrates the method of installation with external coupling device.
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