Activation; Switching Off - Wilo Atmos GIGA-I Einbau- Und Betriebsanleitung

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9.3

Activation

9.4

Switching off

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DANGER
Danger of personal injury and property damage due to ex-
tremely hot or extremely cold pressurised fluid!
Depending on the temperature of the fluid, when the venting device is
opened completely, extremely hot or extremely cold fluid may escape in
liquid or vapour form. Fluid may shoot out at high pressure depending on
the system pressure.
• Always exercise caution when opening the venting device.
Fill and vent the system correctly.
1. To do this, loosen the air vent valves and vent the pump.
2. After venting the pump, tighten the air vent valves again so that no more water can
escape.
NOTICE
• Always keep to the minimum pressure!
• To avoid cavitation noises and damage, a minimum inlet pressure must be guaranteed at
the suction port of the pump. The minimum inlet pressure depends on the operating
situation and the pump's duty point. Accordingly, the minimum pressure must be de-
termined.
• The main parameters for defining the minimum inlet pressure are the NPSH value of the
pump at its duty point and the vapour pressure of the fluid. The NPSH value can be
found in the technical documentation of the respective pump type.
1. By briefly switching on, check whether the direction of rotation agrees with the arrow
on the fan cover. If the direction of rotation is incorrect, proceed as follows:
• For direct starting: Swap two phases on the motor terminal board (e.g. L1 for L2).
• For Y-Δ starting:
Swap the thread start and thread end of two windings on the motor terminal board (e.g.
V1 for V2 and W1 for W2).
• The unit may only be switched on when the shut-off device on the discharge side is
closed! Only after full speed has been reached may the shut-off device be slowly
opened and be adjusted to the duty point.
The unit must run smoothly and free of vibration.
During the running-in period and normal operation of the pump, a small amount of leakage,
i.e. a few drops, is normal. A visual inspection is required from time to time. If there is clearly
detectable leakage, the gasket must be replaced.
DANGER
Risk of fatal injury due to lack of protective devices!
Due to missing protective devices of the terminal box or in the range of
the coupling/motor, electric shock or contact with rotating parts can lead
to life-threatening injuries.
• Immediately after the conclusion of all work, all the provided safety
and protection equipment items must be properly installed and put
into operation!
• Close the shut-off device in the pressure pipe.
NOTICE
If a non-return valve is installed in the pressure pipe, and there is coun-
terpressure, the shut-off device can remain open.
Installation and operating instructions • Wilo-Atmos GIGA-I/-D/-B • Ed.01/2023-06