Maintenance - Calpeda MXV-B Instructions Pour L'utilisation

ATTENTION: when the pump is located above the
water level (suction lift operation,fig. 3A), after a
long idle period, before restarting the unit, check
that the pump is still filled with liquid and vented.
Otherwise, check for proper operation (opening and
closing) of the foot valve and fill the pump with liquid
GB
(see section 7.2.).
Never run the pump for more than five minutes
with a closed gate valve.
Prolonged operation without a change of
water in the pump causes dangerous increases of
temperature and pressure.
In systems in which it may be possible to operate with
a closed delivery gate valve, install a bypass valve (fig.
3) to ensure a minimum flow of about:
0,3 m /h for MXV(B) 25, MXV(L) 25, MXV(L)4 25,
3
0,4 m /h for MXV(B) 32, MXV(L) 32, MXV(L)4 32,
3
0,5 m /h for MXV(B) 40, MXV(L) 40, MXV(L)4 40,
3
1,0 m /h for MXV-B 50, MXV(L) 50, MXV(L)4 50
3
1,5 m /h for MXV(L) 65, MXV(L)4 65
3
2,6 m /h for MXV(L) 80, MXV(L)4 80
3
2,9 m /h for MXV(L) 100
3
When the water is overheated due to prolonged
operation with a closed port, stop the pump before
opening the gate valve.
To avoid any risk of danger to users and the creation of
harmful thermal stress in the pump and system due to
large temperature differentials, wait until the water has
cooled inside the pump before starting again or before
opening the drainage and filling plugs.
Care must be taken when the pumped fluid
has a high temperature. Do not touch the fluid
when its temperature is higher than 60 ˚C.
Do not touch the pump or motor when their
surface temperature is higher than 80 ˚C.
7.4. Switch off of the pump
ON
The appliance must be switch off every time
there are faults. (see troubleshooting).
The product is designed for a continuous duty, the
switch off is performed by disconnecting the power
supply by means the expected disconnecting devices.
(see paragraph "6.5 Electrical connection").

8. MAINTENANCE

Before any operations it's necessary to disconnect the
power supply.
If required ask to an electrician or to an expert
technician.
Every maintenance operations, cleaning or
reparation executed with the electrical system
under voltage, it could cause serious injuries
to people.
In case of extraordinary maintenance, or maintenance
operations that require part-removing, the operator
must be a qualified technician able to read schemes
and drawings.
It is suggest to register all maintenance operation
executed.
During maintenance keep particular attention in
i
order to avoid the introduction of small external
parts, that could compromise the device safety.
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It is forbidden to execute any operations with
the direct use of hands. Use water-resistant,
anti-cut gloves to disassemble and clean the
filter or in other particular cases.
During maintenance
i
personnel is not allowed.
Maintenance operations that are not described in
this manual must be made only by special personnel
authorized by Calpeda S.p.A.
For further technical information regarding the use or
the maintenance of the device, contact Calpeda S.p.A.
8.1. Routine maintenance
OFF
Before every
disconnect the power supply and make sure
that the device could not accidentally operate.
Under normal operating conditions the pump-motor
unit will not require maintenance.
Conduct routine inspection on the pump and connected
parts to check for a perfect seal.
Check the seal on the shaft from the outside through
the coupling guard.
The special funnel-shaped upper cover is designed to
contain any small initial leaks.
Keep the pump and surrounding part clean so as to be
able to immediately detect any outward leakage.
Clean the filter in the suction pipe and/or foot valve
at regular intervals; check performance and absorbed
current.
The ball bearings in the motor and the ball bearing in
the pump (66.00 - see section 8.5) have permanent
lubrication.
No regreasing is necessary.
See the operating instructions of the motor (if supplied).
Remove any excess grease expelled from the ball-
bearing (66.00) after the first period of operation.
In the case of water containing chloride (chlorine or
sea water) the risk of corrosion increases in stagnant
water conditions (also with an increase in temperature
and decrease of pH value). In these cases, if the pump
remains inactive for long periods, it must be emptied
completely.
For good measure, as for temporary operation with
dirty liquids, run the pump briefly with clean water to
remove deposits.
Or, after draining, perform the washing operation,
inserting clean water (at least 40 litres) into the filling
hole (1) on the delivery side and allowing it to come
out of the draining hole (3) on the suction side (fig.4).
When the pump remains inactive it must be
emptied completely if there is a risk of freezing.
Before starting the motor again fill the pump completely
with liquid (see section 7.2.) and make sure the shaft
is not jammed by encrustation, sticking of the faces of
the mechanical seal or other causes. In the event that
the shaft cannot be moved by hand, the pump has to
be dismantled and cleaned.
Disconnect electrical power before any
servicing operation and make sure the
pump cannot be accidentally switched on.
MXV, MXV-B Rev4 - Operating Instructions
operations external
maintenance operations