DAB 1CM-G 80-650, Instruction For Installation And Maintenance

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ENGLISH
11
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In systems where twin pumps are fitted, provide separate wiring and switches for each pump so as to ensure continuous service.
8. STARTING UP
As well as being at high temperature and high pressure, the fluid in the system may also be in the form of steam!
DANGER OF BURNING!
It may be dangerous even to touch the pump or parts of the system.
Before starting up you must fill the system with water and bleed the air. Bleed the residual air from the pump body through the bleeding cock
provided until only water comes out (Fig. E) . This ensures that the mechanical seal is well lubricated and that the pump immediately starts to
work regularly. Dry operation, even for brief periods, causes irreparable damage to the mechanical seal.
− Switch on the power and, on three-phase versions, check that the motor is turning in the right direction, that is clockwise when viewed
from the fan side, (Fig. F) . Otherwise invert any two phase leads, after having disconnected the pump from the mains.
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With the pump running, check the supply voltage at the motor terminals, which must not differ from the rated value by +/- 5% ( Fig. G ).
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With the unit at regular running speed, check that the current absorbed by the motor does not exceed the value on the data plate.
9. PRECAUTIONS
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The electropump should not be started an excessive number of times in one hour. The maximum admissible value is as follows:
Maximum number of start per hour
Single-Phase Motors 30
Three-Phase Mot. up to 5.5 HP 20 ÷ 30
Three-Phase Mot. from 7.5 to 60 HP 5 ÷ 10
9.1 Danger of frost: Fig. H
Check that the leakage of liquid does not damage persons or things, especially in plants that use hot water. The system must
be drained only once the fluid temperature has reached environment temperature.
Do not close the drainage cap until the pump is to be used again.
When restarting after long periods of inactivity it is necessary to repeat the operations described above in the paragraphs “WARNINGS” and
“STARTING UP” .
10. MAINTENANCE AND CLEANING
As well as being at high temperature and high pressure, the fluid in the system may also be in the form of steam! DANGER
OF BURNING!
It may be dangerous even to touch the pump or parts of the system .
The electropump can only be dismantled by competent skilled personnel, in possession of the qualifications required by the
legislation in force.
In any case, all repair and maintenance jobs must be carried out only after having disconnected the pump from the power mains. Ensure
that it cannot be switched on accidentally.
If possible, keep to a maintenance schedule: expensive repairs or machine down times can be avoided with a minimum expense. During
maintenance schedule discharge the condensate, if necessary present into the motor, through the hole, removing the exhaust port plug no
(electropumps with IP55 Degree of motor protection only).
Nel If the liquid has to be drained out maintenance, ensure that the liquid coming out cannot harm persons or things, especially
in using hot water.
The legal requirements on the disposal of any harmful fluids must also be complied with.
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In normal operation, the pump does not require any kind of maintenance. However, from time to time
it is advisable to check the plate data, which will enable you to have advance warning of any faults or
wear.
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After any operation involving the removal of the motor head from the pump body, it is advisable
to change the O-ring between the pump body and the support.
10.1 Blanking flanges
For twin-head pumps, a blanking flange with a pump housing gasket is available. See fig. 4
If one pump requires service, the blanking flange is fitted to allow the other pump to continue operating.
Carry out maintenance based on the type of bearing indicated on the technical data plate.
Fig. 4 Fitting the blanking flange
11. TROUBLESHOOTING
Fault Check (possible cause) Remedy
The motor does not start and makes no noise.
− Check the protection fuses.
If they are burnt-out, change them.
− Check the electric connections. If the fault is repeated immediately this means
that the motor is short circuiting.
− Check that the motor is live.
The pump supplies insufficient flow.
− The impeller is worn or blocked.
Change the impeller or remove the obstruction.
− Check that the direction of rotation on three-
phase versions is correct.
Invert the connection of two supply wires.