Grundfos CMBE 3-93 Instrucciones De Instalación Y Operación página 23

9. Servicing the product
DANGER
Electric shock
Death or serious personal injury
‐
Switch off the incoming power sup-
ply before you start any work on
the product or connected pumps.
‐
Make sure that the power supply
cannot be switched on accidentally.
9.1 Maintenance
The internal pump parts are maintenance-free.
The motor has maintenance-free, greased-for-life
bearings.
9.2 Motor cleaning
Keep motor cooling fins and fan blades clean to
ensure adequate cooling of the motor and
electronics.
You must keep the motor clean to ensure
sufficient cooling of the motor. If the product is
installed in dusty environments, clean and check
the motor regularly. Take the enclosure class of
the motor into account when cleaning.
9.3 Refilling of the diaphragm tank
We recommend that you refill the tanks
with nitrogen gas once a year.
10. Taking the product out of
operation
10.1 Maintaining the product during
standstill
10.1.1 Frost protection
If the product is not being used during periods of
frost, it must be drained to avoid damage.
Remove the filling and drain plugs. Do not refit the
plugs until the product is put into operation again.
10.1.2 "Standstill heating"
Use this function to avoid condensation in humid
environments.
When you set the function to Active and the
product is in operating mode Stop, a low AC
voltage is applied to the motor windings. The
voltage is not high enough to make the motor
rotate, but ensures that sufficient heat is
generated to avoid condensation in the product,
including the electronic parts in the drive.
Remember to remove the drain plugs
and fit a cover over the product.
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