Insulation Resistance; Maintenance; Pumps; Motors - Grundfos Hydro Multi-E Series Installation And Operating Instructions Manual

14. Insulation resistance

Do not measure the insulation resistance of
motor windings or an installation incorporating
Caution motors with integrated frequency converters
using high-voltage megging equipment, as this
may damage the built-in electronics.

15. Maintenance

Warning
Before starting work on the product, switch off
the power supply for at least 5 minutes.
Make sure that the power supply cannot be
accidentally switched on.

15.1 Pumps

Pump bearings and shaft seals are maintenance-free.
If CRE or CRIE pumps are to be drained for a long period of
inactivity, remove one of the coupling guards to inject a few drops
of silicone oil on the shaft between the pump head and the
coupling. This will prevent the shaft seal faces from sticking.

15.2 Motors

Keep motor cooling fins and fan blades clean to ensure sufficient
cooling of the motor and electronics.
15.2.1 Motor bearings
Motors up to and including 5.5 kW are maintenance-free.
CRE and CRIE pumps: In the case of seasonal operation (motor
is idle for more than six months of the year), we recommend to
grease the motor when you take the Hydro Multi-E out of
operation.

15.3 Breaker cabinet

The breaker cabinet is maintenance-free. Keep it clean and dry.

16. Shutdown

Shut down the system with the main switch in the breaker
cabinet.
Warning
The wires in front of the main switch are still
energised.
To shut down a pump, switch off the circuit breaker of the pump.

16.1 Frost protection

If pumps are not used during periods of frost, they must be
drained to avoid damage.
Drain the pump by loosing the air vent screw in the pump head
and remove the drain plug from the base.
Do not tighten the air vent screw and replace the drain plug until
the system is to be used again.

16.2 Service kits

See www.grundfos.com (WebCAPS) or WinCAPS.
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