Maintenance - Wilo Multivert MVI 16 Série Notice De Montage Et De Mise En Service

ENGLISH
For pumps with a star or triangular circuit starting current, the
connections of two coils must be interchanged, e.g. U1 with V1 and
U2 with V2.
– If the fluid temperature is too high, steam may form which may
damage the pump. The pump must therefore not run with the valve
closed for longer than 10 minutes when pumping cold water or for
longer than five minutes when pumping fluid where > 60 °C.
We recommend that the flow rate does not drop to below 10 % of
the nominal flow rate so as to avoid a build up of steam in the pump.
– If there is a build up of steam, this should be allowed to escape by
carefully opening the vent screw.
Both pump and motor can reach operating temperatures
> 100 °C. Therefore exercise caution when touching the
pump.

7 Maintenance

Before carrying out any maintenance work, switch off the
pump and ensure that it cannot be switched on again by
unauthorised people. Never carry out work on a running
pump.
– During the running-in period, there may be some dripping from the
axial face seal. In the event of a serious leak as a result of heavy
wear have the mechanical seal replaced by a specialist.
– Increased bearing noise and unusual vibrations indicate a worn
bearing. In this case, have the bearing replaced by a specialist.
– If the pump is exposed to frost, the pump and pipework must be
emptied in the cold season. Close the isolating valve and open the
drain valve (Fig. 2, 6) and the vent screw (Fig. 2, 5) of the pump.
The isolating valve must be closed before the drain valve is
opened.
– If placed in a frost-free location, the pump does not have to be emp-
tied, even if it is out of service for a long period.
12
On pumps equipped with greaser under bearing box (table below), see
greasing instructions written on sticker put on it:
Type
< 22 kW
MVI 16
MVI 32
MVI 52
MVI 70
MVI 95
For pumps equipped with coupling bush, check it
before reassembling.
22 kW 30 kW 37 kW
✔
✔ ✔
✔ ✔ ✔
✔
✔ ✔
45 kW
✔
✔