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Fig. 12: Check direction of rotation
9.3
Activation
70
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.
•
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 situ-
2
ation and the pump's duty point. Accordingly, the minimum pressure must be determined.
•
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.
The mechanical seal ensures that a seal will not leak and requires no special setting. Should
there be a small leakage at the beginning, it will stop when the initial inlet phase of the
gasket is over.
WARNING
There is a risk of burns or freezing upon coming into contact
with the pump/system.
Depending on the pump and system operating conditions (fluid temper-
ature), the entire pump can become very hot or very cold.
• Keep a safe distance during operation!
• Allow the system and pump to cool down to room temperature!
• Always wear protective clothing, safety gloves and safety glasses
when working.
DANGER
Danger of personal injury and material 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.
NOTICE
• Always keep to the minimum pressure!
Installation and operating instructions • Wilo-Atmos GIGA-I/-D/-B • Ed.01/2023-08
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