Maintenance; Service Kits; Start-Up After A Long Period Of Inactivity; Service - Grundfos MQ Serie Instrucciones De Instalación Y Funcionamiento

10. Maintenance

Under normal operating conditions, the pump
is maintenance-free. However, it is recom-
mended to keep the pump clean.
WARNING
Do not remove the pressure tank
from the pump unless it has been
vented through the air escape
valve.
Never touch the electronics unless
the pump has been switched off
for at least 5 minutes.
If there is any risk of frost damage, drain the
pump through the drain hole and slacken the
union nut on the discharge pipe, see fig. 16.
The pump must be filled with liquid before it is
started up again. See fig. 14.
Fig. 16 Draining the pump

10.1 Service kits

Service kits are available for the MQ pump.
The service kits consist of the following
replaceable parts:
• shaft seal
• motor
• electronic units
• hydraulic components.
10.2 Start-up after a long period of
inactivity
The end cover incorporates a plug which can
be removed by means of a suitable tool.
See fig. 17. It is then possible to free the pump
rotor if it has seized up as a result of inactivity.
If it has been drained, the pump must be filled
with liquid before start-up. See fig. 14.
Fig. 17 Removing the end-cover plug

11. Service

If a pump has been used for a liq-
uid that is injurious to health or
Note
toxic, the pump will be classified
as contaminated.
If Grundfos is requested to service the pump,
Grundfos must be contacted with details about
the pumped liquid, etc. before the pump is
returned for service. Otherwise Grundfos can
refuse to accept the pump for service.
Possible costs of returning the pump are paid
by the customer.
However, any application for service (no mat-
ter to whom it may be made) must include
details about the pumped liquid if the pump
has been used for liquids which are injurious
to health or toxic.
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