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10. 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/cover plate and by removing the drain
plug from the pump housing. See fig. 13.
Drain plug
Fig. 13 Location of drain plug
Replace the drain plug. Do not tighten the air vent
screw until the pump is to be used again.
11. 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.
11.1 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.
11.2 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 motor must be cleaned
and checked regularly.
Lubrication
The bearings of motors up to 11 kW are greased for
life.
The bearings of motors of 11 kW and up must be
greased in accordance with the indications on the
motor nameplate.
The motors 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.
12. Technical data
12.1 Mechanical data
See pump nameplate.
12.2 Electrical data
See motor nameplate.
12.3 Weights
See label on the packing.
12.4 Sound pressure level
See page 288.
17
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