Lowara LEZ 200-250 UNL 2204 [14/19] Model ler lers lez
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Lowara LEZ 200-250 UNL 2204 [14/19] Model ler lers lez

Lowara LERS 150-200 UNL 4502 [14/19] Model ler lers lez
Installation, Operation and Maintenance Instruction
Model LER, LERS, LEZ
LER 100-english page 11
Revision 01
Article No 771073302
Issue 01/2010
months. All further inspection intervals should be
determined on the basis of the state of the pump.
6.7 Shutting down
Close the valve in discharge pipe right before
(max. 10 seconds) switching off the motor. This is
not necessary if there is a spring-loaded check
valve.
Switch off motor (make sure it runs down quietly).
Close the valve on suction side.
On danger of freezing empty pump and pipes
completely.
6.8 Storage / longer periods of non-
operation
6.8.1 Storage of new pumps
If the putting into operation shall happen a longer
period after the delivery, we recommend the following
measures for the storage of the pump:
Store pump at a dry place.
Rotate pump by hand at least once a month.
6.8.2 Measures for longer putting out of operation
Pump remains installed and in ready for operation:
Test runs of 5 min. duration must be made in
regular intervals. The span between the test runs
is depending on the plant. However, it should be
made once a week, at least.
6.8.3 Longer periods of non-operation
Start-up must be handled like initial start-up (see
chapter 6).
a) Filled pumps
Switch stand-by pumps on and immediately off
again once a week. Possibly use as main pump.
If the stand-by pump is under pressure and
temperature: leave all existing sealing and flushing
systems switched on.
Replace motor bearings after 5 years.
b) Drained pumps
Turn shaft at least 1x week (do not switch on
because of dry running).
Replace motor bearings after 5 years.
7. Servicing, Maintenance
7.1 General remarks
Work should only be carried out on the pump or
pump unit when it is not in operation. You must
observe chapter 2.
Maintenance and servic
ing work must only be
carried out by trained, experienced staff who
are familiar with the contents of these Operating
Instructions, or by the Manufacturer's own
service staff.
7.2 Mechanical seals
Before opening the pump, it is essential that you
note chapter 2 and chapter 8.
If the liquid being handled leaks out at the mechanical
seal, it is damaged and must be replaced.
7.3 Motor bearings
After approx. 5 years the grease in the motor bearings
is so aged, that a replacement of the bearings is
recommended. However, the bearings must be
replaced after 25000 operating hours, at least, resp.
acc. to the Maintenance Instruction of the motor
supplier, if that recommends a shorter maintenance
period.
7.4 Cleaning of pump
Dirt on the outside of the pump has an adverse
effect on transmission of heat. The pump should
therefore be cleaned with water at regular
intervals (depending on the degree of dirt).
The pump must not be cleaned with pressurized
water
- water will get into the motor.
8. Dismantling and repair of pump
8.1 General remarks
Repair to the pump or pump system may only
be carried out by authorised skilled personnel or
by the manufacturer’s specialist staff.
When disassembling the pump pay attention to
chapter 2 and chapter 4.1.
For mounting and repair you can order specialized
personnel if you want.
If dangerous liquids are pumped the appropriate
disposal of the handled liquid is necessary
befo
re the disassembly of the pump. Pay
attention to the fact, that even in drained pumps
t
here are remainders of the handled liquid. If
necessary the pump must be flushed or
decontaminated. Laws must be observed,
otherwise danger to health is existing!
Before the disassembly the pump has to be
secured in such a way, that it cannot be started.
The pump casing must be drained and without
pressure.

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