Grundfos SE - Page 8

The pump must not be used to pump
explosive, flammable or combustible
liquids.
The classification of the installation site
must comply with the local regulations.
Specific conditions for safe use of
explosion-proof pumps:
1. Make sure the moisture- and thermal
switches are connected in two
separate circuits and have separate
alarm outputs (motor stop) in case of
high humidity or high temperature in
the motor.
2. Bolts used for replacement must be
class A4-80 or A2-80 according to
EN/ISO 3506-1.
3. Contact the manufacturer if
dimensional information on the
flameproof joints is necessary.
4. During operation, the cooling jacket, if
fitted, must be filled with cooling liquid.
5. The level of the pumped liquid must be
controlled by level switches connected
to the motor control circuit. Install an
additional level switch to ensure that
the pump is stopped in case the stop
level switch is not working.
6. Dry running is not allowed.
7. Make sure the cable is mechanically
protected, attached to the switchboard
and the cable bonding cannot slip out.
8. The sewage pumps have an ambient
temperature range of -20 to +40 °C
and a maximum operating temperature
of +40 °C.
9. Avoid exposing the ethylene-propylene
rubber insulated cables to direct
sunlight.
10. Dry-installed pumps often have a
higher temperature in the cable entries
than submerged pumps. This may
reduce the lifetime of the Ex-protection.
According to IEC/EN 60079-14, it is a
user responsibility to regularly inspect
the condition of the permanently
attached cables and cable entries for
any visual damage, cracks or
embrittlement caused by rubber aging.
11. The thermal protector in the stator
windings must have a rated switch
temperature of 150 °C and it
ensures the disconnection of the power
supply. Resetting must be carried out
manually.
12. To avoid electrostatic discharge, clean
the cables and the painted parts of the
pump with a wet fabric.
13. When the pump is operated by a
frequency converter, the installation
must be rated up to T3 temperature
class. When the pump is operated
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English (GB)