Maintenance And Service - Grundfos Multilift MD Serie Instrucciones De Instalación Y Funcionamiento

9. Startup
Warning
Before starting any work on a pump used for
pumping liquids which could be hazardous to health,
clean and vent the pump, pit, etc., thoroughly
according to local regulations.
Warning
Before making any connections in LC 221 or working
on pump, pit, etc., make sure that the power supply
has been switched off and that it cannot be
accidentally switched on.
Prior to start-up, the connection and settings must have been
carried out according to sections
8.4 Setting of LC 221.
Start-up must be carried out by authorised personnel.
Proceed as follows:
1. Check all connections.
2. Connect the plug to the power supply and follow the controller
start-up sequence.
Note: It will take up to 45 seconds to boot the controller.
This time can be reduced to 5 seconds by pressing the OK
button. When the power supply is connected for the first time,
three values for the start level can be chosen (180, 250 or
315 mm above floor level) according to the inlet height to the
collecting tank. If the inlet height is between two levels,
choose the lower level for start in the display. All other
settings are preset. Some settings can be changed.
See section 8.4 Setting of LC
for automatic mode (selector switch in pos. AUTO).
3. Open the isolating valves in discharge and inlet lines.
4. Activate a sanitary appliance connected to the inflow of the
Multilift MD or MLD and monitor the increasing liquid level in
the tank up to the start level. Check the starts and stops at
least twice.
If the pump cable was disconnected from the
controller, for instance to lead the cable through an
Note
empty cable conduit, check the direction of rotation
of the pump. See section
8.3 Electrical connection and
221. Now the controller is ready
10.2 Motor.

10. Maintenance and service

The Multilift MD and MLD require a minimum of maintenance.
Warning
Before carrying out maintenance and service on
lifting stations used for pumping liquids which might
be hazardous to health, make sure that the lifting
station has been thoroughly flushed with clean water
and that the discharge pipe has been drained. Rinse
the parts in water after dismantling. Make sure that
the isolating valves have been closed. The work
must be carried out in accordance with local
regulations.
Warning
Before making any connections in LC 221 or working
on lifting stations, make sure that the power supply
has been switched off and that it cannot be
accidentally switched on.
According to EN 12056-4 lifting stations must be checked at the
following regular intervals:
• every 12 months in single-family houses
• every 6 months in multi-family dwellings
• every 3 months in commercial and industrial applications.
During the check, local regulations must be observed.
The periodic checks of the lifting station must be carried out by
authorised personnel and must comprise electrical and
mechanical maintenance.
Check the following points:
• Discharge and inlet connections
Check all connections to the lifting station for tightness and
leakages. Make sure that weight from the inlet, discharge and
venting pipes does not rest on the tank. Long pipe sections,
valves, etc. must be supported.
• Power consumption
See nameplate.
• Cable entry
Make sure that the cable entry is watertight and that the
cables are not bent sharply and/or pinched.
• Pump parts
Remove eight screws and dismantle the pump from the tank
and check that the vent hole of the pump housing is clear.
When the pumps is mounted again, we recommend to replace
the O-ring between pump and tank. Make a test run with clean
water. In case of noise, vibration or abnormal running, contact
Grundfos.
• Ball bearings
Check the shaft for noisy or heavy operation. Replace defective
ball bearings. A general overhaul of the pump is usually
required in case of defective ball bearings or poor motor
function. This work must be carried out by the manufacturer or
an authorised service workshop.
Cleaning the non-return valve (if required)
Proceed as follows:
1. Close the isolating valves in the discharge pipe and in the
inlet pipe (if fitted) or drain the discharge pipe by tightening
the drain screw on the side of the non-return valve. See fig. 5.
2. Clean the non-return valve via its inspection cover.
Replace the gasket of the inspection cover when
reassembling the non-return valve.
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