Maintenance; Pump; Motor; Frost Protection - Grundfos TP 150-310/4 Montage- Und Betriebsanleitung

10. Maintenance

Warning
Before starting work on the pump,
make sure that the electricity supply
has been switched off and that it
cannot be accidentally switched on.

10.1 Pump

The pump is maintenance-free.
If the pump is to be drained for a long period of
inactivity, inject a few drops of silicone oil on the
shaft between the motor stool and the coupling.
This will prevent the shaft seal faces from sticking.

10.2 Motor

The motor should be checked at regular intervals.
It is important to keep the motor clean in order to
ensure adequate ventilation. If the pump is installed
in a dusty environment, the pump must he cleaned
and checked regularly.
Lubrication:
The bearings of motors up to 11 kW are greased for
life and require no lubrication.
The bearings of motors of 11 kW and up must be
greased in accordance with the indications on the
motor nameplate.
The motor should be lubricated with a lithium-based
grease meeting the following specifications:
• NLGI grade 2 or 3.
• Viscosity of basic oil: 70 to 150 cSt at +40 °C
(~ +104 °F).
• Temperature range: -30 °C (~ -22 °F) to +140 °C
(~ +284 °F) during continuous operation.
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11. Frost protection

Pumps which are not being used during periods of
frost should be drained to avoid damage.
Drain the pump by loosening the air vent screw in the
motor stool and by removing the drain plug from the
pump housing, see fig. 5.
Warning
Care must be taken to ensure that the
escaping water does not cause injury
to persons or damage to the motor or
other components.
In hot water installations, special
attention should be paid to the risk of
injury caused by scalding hot water.
Drain plug
Fig. 5 Drain plug
Do not tighten the air vent screw and replace the
drain plug until the pump is to be used again.