Frequency Converter Operation; Start-Up; Priming; Checking Of Direction Of Rotation - Grundfos CHI Serie Instrucciones De Instalación Y Funcionamiento

4.1 Frequency converter operation

All three-phase motors can be connected to a fre-
quency converter.
Depending on the frequency converter type, this may
cause increased acoustic noise from the motor. Fur-
thermore, it may cause the motor to be exposed to
detrimental voltage peaks.
Note: The motors must be protected against voltage
peaks higher than 650 V (peak value) between the
supply terminals.
The above disturbances, i.e. both increased acoustic
noise and detrimental voltage peaks, can be elimin-
ated by fitting an LC filter between the frequency
converter and the motor.
For further information, please contact the frequency
converter supplier or Grundfos.

5. Start-up

At high system temperatures, the pump
may be burning hot. Do not touch it.

5.1 Priming

Before start-up, or if the pump has been drained, the
pump must be filled with liquid and vented.
Proceed as follows:
In closed systems or open systems where the liquid
level is above the pump inlet:
1. Close the discharge isolating valve.
2. Remove the priming plug in the pump sleeve, see
fig. 7.
3. Slowly open the isolating valve in the suction
pipe until a steady stream of liquid runs out of the
priming port.
The escaping liquid may be scalding hot.
Therefore, care must be taken to ensure
that the liquid does not cause personal
injury or damage to other components.
4. Replace the priming plug and tighten securely.
5. Completely open the isolating valve(s).
Priming plug G 3/8 /
vent screw (accessory)
Drain plug G 3/8
Fig. 7 Plugs in pump sleeve
In open systems where the liquid level is below the
pump inlet, the suction pipe must also be filled with
liquid and vented before the pump is started:
1. Close the discharge isolating valve.
2. Remove the priming plug in the pump sleeve.
3. Pour liquid through the priming hole until the suc-
tion pipe and the pump are completely filled with
liquid.
- If the suction pipe does not slope downwards
away from the pump, air must be purged from
the suction pipe while the pump is being filled.
- Filling may take place at the highest point of the
suction pipe if this is above the priming plug of
the pump.
4. Replace the priming plug and tighten securely.

5.2 Checking of direction of rotation

Arrows on the fan cover indicate the correct direction
of rotation. The pump should rotate counter-clock-
wise when seen from the motor fan.

6. Operation and maintenance

6.1 Frequency of starts and stops

Maximum 100 starts per hour.

6.2 Maintenance

Pum and motor are maintenance-free.

6.3 Frost protection

Pumps which are not being used during periods of
frost should be drained to avoid damage.
Remove the priming and drain plugs and allow the
pump to drain. Do not replace the plugs until the
pump is to be used again.
The escaping liquid may be scalding hot.
Therefore, care must be taken to ensure
that the liquid does not cause personal
injury or damage to other components.

6.4 Cleaning

If the pump has been used for pumping aggressive
or polluted liquids, it should be flushed through with
clean water to avoid corrosion or sediment in case
the pump is not being used for some time.

6.5 Service

If a pump has been used for a liquid which
is injurious to health or toxic, the pump will
be classified as contaminated.
If Grundfos is requested to service the pump,
Grundfos must be contacted with details about the
pumped liquid, etc. before the pump is returned for
service. Otherwise Grundfos can refuse to accept
the pump for service.
Possible costs of returning the pump are paid by the
customer.
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