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Fig. 13: Installed coupling guard
10
Maintenance
72
The pump can be switched on and off in different ways. This depends on the different oper-
ating conditions and the degree of automation of the installation. Observe the following
points:
Stop procedure:
•
Prevent return flow to the pump.
•
Do not work too long with too low a volume flow.
Start procedure:
•
Make sure that the pump is completely filled up.
3
•
Do not work too long with too low a volume flow.
•
Larger pumps require a minimum flow rate amount to operate properly.
•
Operating against a closed shut-off device can lead to overheating in the centrifugal
chamber and to damage of the shaft seal.
•
Ensure a continual flow to the pump with a sufficiently large NPSH.
•
Prevent insufficient counter pressure leading to a motor overload.
•
To avoid significant increases in motor temperature and excessive load on the pump,
coupling, motor, gaskets and bearings, perform no more than 10 switch-on procedures
per hour.
•
Maintenance work: The technician must be familiar with the use of operating fluids and
their disposal.
•
Electrical work: a qualified electrician must carry out the electrical work.
•
Installation/dismantling: The technician must be trained in the use of the necessary
tools and fixation materials.
It is recommended to have the pump serviced and checked by the Wilo customer service.
DANGER
Danger of death due to electrical current!
Improper conduct when carrying out electrical work can lead to death
due to electric shock!
• Any work on electrical devices may only be carried out by a qualified
electrician.
• Before carrying out any work, disconnect the unit from the power
supply and secure it against accidental switch-on.
• Any damage to the pump connection cable should only ever be recti-
fied by a qualified electrician.
• Follow the installation and operating instructions for the pump, level
control device and other accessories.
• Never poke around in the motor openings or insert anything into
them.
• After completing the work, refit previously dismantled protective
devices, for example, terminal box covers or coupling covers.
DANGER
Danger of death from falling parts!
The pump itself and pump parts can have a very high net weight. Falling
parts pose a risk of cuts, crush injuries, bruises or impacts, which can be
fatal.
• Always use suitable lifting accessories and secure parts against falling.
• Never stand below a suspended load.
• During storage and transport, as well as before all installation and as-
sembly work, ensure that the pump is in a safe position and standing
securely.
Installation and operating instructions • Wilo-Atmos GIGA-I/-D/-B • Ed.01/2023-08
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