Checking Parts Subject To Wear; Minor Problems: Causes And Solutions; Disposing Of Motor Pumps; Electrical Connection - Zenit DRO Serie Manual De Uso

- If a very small quantity of water is detected at the bottom of the mechanical seal chamber, this will be due to
condensation and is normal, not a sign of any fault with the mechanical seal.
- If a substantial quantity of water has entered the oil chamber and contaminated the oil, this indicates that the
mechanical seal needs inspecting, and perhaps replacing
- Fill the chamber completely with biodegradable oil, CASTROL HYDROIL P46 or similar, and once full remove
20-25 cc to ensure a sufficient air cushion in the chamber;
- When finished tighten the plug and re-install the motor pump.
If none of the above is available, exceptionally, common vaseline oil can be used. For maintenance, contact our
nearest service centre.
Any repairs to the motor pump must be carried out by the manufacturer or by specialist personnel. If this is not
respected, the guarantee will be invalidated and the machine may become unsafe.

5.2 CHECKING PARTS SUBJECT TO WEAR

Before inspection and maintenance operations carefully read and apply the safety procedures indicated in
paragraphs 1.2 and 1.3
During programmed maintenance or at any time in which the performance of the motor pump should be reduced or
if vibrations and noise should increase, the hydraulic parts subject to wear must be checked. Original spare parts
only should be used. If the hydraulic part should be partially or totally blocked it should be cleaned thoroughly with
a jet of high pressure water. If necessary dismantle the hydraulic part referring to the exploded view in fig. 2 - 2/a.

6. MINOR PROBLEMS: CAUSES AND SOLUTIONS

FAULTS
motor does not turn
motor functions normally but
no water is pumped
pump has reduced flow rate
thermal protector has cut in

7. DISPOSING OF MOTOR PUMPS

In the event that is not considered economically viable to repair a worn or damaged motor pump, the motor pump
and motor must be disposed of in full compliance with local regulations.
To dispose of a motor pump proceed as follows:
- remove any oil in the chamber and dispose of in a specialised collection centre;
- separate the parts in plastic and rubber and dispose of in a specialised collection centre;
- arrange for the break-up of the metal parts.
Do not dispose of any motor pump component in the environment.

8. ELECTRICAL CONNECTION

8.1 SINGLE PHASE ELECTRIC MOTOR CONNECTION

Single phase motor pumps equipped with NOLTA plugs are connected by inserting the plug int a suitable electrical
socketFor single phase motor pumps with capacitor boxes connect the yellow-green lead to earth and supply the
capacitor box output leads. If the leads from the capacitor/thermal switch box should be disconnected, reconnect
the motor pump output leads as follows:BLACK lead to a thermal switch connector, the other line connector to the
BLUE lead and one connector of the capacitor, the other connector of the capacitor to the BROWN lead. For single
phase motor pumps not fitted with a capacitor box connect the motor pump output leads as follows: BLACK lead to one
line connector, BLUE lead to the other line connector and to one connector of a capacitor of adequate capacity (see
table 5); BROWN lead to the other capacitor connector.
SINGLE-PHASE electrical connection fig. 3.
POSSIBLE CAUSE
no voltage
automatic switch tripped
impeller jammed
thermal protection cut in
check valve jammed
blocked pipeline
impeller, valve or pipelines obstructed
liquid level too low
incorrect supply voltage
wrong direction of rotation (three phase
motor)
impeller jammed
temperature of liquid too high
12
SOLUTION
check the power supply line
reset the switch and establish the
cause
establish the cause of the trouble
and remove it
resets automatically
clean the valve and check its
operation
identify the obstruction and remove it
identify the obstruction and remove it
turn the pump off immediately
match the voltage to the values
indicated on the data plate
invert any two phases
identify the cause of the trouble and
remove it
contact your nearest zenit dealer