Pump Stop; Maintenance; Service Kits; Start-Up After A Long Period Of Inactivity - Grundfos MQ Serie Notice D'installation Et D'entretien

9.2 Pump stop

The pump incorporates an electronic protective
function that will stop the pump in case of
• dry running
• overtemperature
• overloaded motor
• seized-up motor/pump.
The pump will restart automatically after 30 minutes
(for 24 hours) in case of any type of fault if the auto-
reset function is activated (the green indicator light
on the control panel is on, see point 5 in the table of
section 9.1 Control panel).
The pump settings are stored. After
supply failure, the pump will
automatically revert to its previous
Note
operating condition when the electricity
supply is reconnected.

10. Maintenance

Under normal operating conditions, the pump is
maintenance-free. However, it is recommended 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 liquid
that is injurious to health or toxic,
Note
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 matter 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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