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4.3 Motor direction of rotation
Never check the motor direction of rotation unless
the pump and motor couplings have been
disconnected and physically separated. Failure to
follow this instruction can result in serious damage to
the pump and the motor if the direction of rotation is
wrong.
After the product has been wired and checked to ensure that all
components in the system, such as disconnect devices, magnetic
starters, pilot devices and motors, are properly connected, check
the motor direction of rotation as follows:
•
For three-phase products only, momentarily start the motor to
ensure that the direction of rotation is correct as indicated by
the arrow cast into the pump housing.
If the direction of rotation is incorrect, interchange two wires at
the motor starters terminals T1 and T2.
•
For Wye-Delta motors rotation must be verified for both wye
and delta connections.
The pumps must not be operated while dry.
Use extreme caution that motors are started only
momentarily to determine proper direction of rotation.
4.4 Starting the pump
DANGER
Moving machine parts
Death or serious personal injury
- Mount an approved coupling guard before
operating the product.
1. Install a coupling guard on coupled products.
2. Fully open the gate valve, if any, in the inlet line, and close the
gate valve in the outlet line.
3. Fill the inlet line with liquid and completely prime the pump.
4. Start the pump.
5. Immediately make a visual check of the pump and inlet pipe
for pressure leaks.
6. Immediately after the pump has reached full operating speed,
slowly open the outlet gate valve until complete system flow is
achieved.
7. Check the outlet pipe for pressure leaks.
8. If the pump is fitted with pressure gauges, open gauge cocks
and note down pressure readings for future reference. Verify
that the pump is performing in accordance with the
parameters specified in the performance curves.
9. Check and note down voltage, amperage per phase and
kilowatts, if a wattmeter is available.
4.5 Voltage and frequency variation
The motor will operate satisfactorily under the following voltage
and frequency variations, but not necessarily in accordance with
the standards established for operation under rated conditions:
•
The voltage variation must not exceed 10 % above or below
the rating specified on the motor nameplate.
•
The frequency variation must not exceed 5 % above or below
the motor rating.
•
The sum of the voltage and frequency variations must not
exceed 10 % above or below the motor rating, provided the
frequency variation does not exceed 5 %.
5. Handing and storing the product
See sections
2.3 Temporary storage after
and
shutdown
8.3 Long-term
shutdown.
6. Product introduction
6.1 Applications
Grundfos CVM and CHM pumps are intended for use in the
following applications:
•
building services
•
water supply.
Building services
Liquid transfer and pressure boosting in the following:
•
Circulation of liquids
•
heating and cooling water in central heating, district heating,
ventilation and air-conditioning systems
•
water supply
•
boosting systems
•
water circulation for swimming pools.
Water supply
Liquid transfer and pressure boosting in the following:
•
Filtration and transfer at waterworks
•
waterworks and substations
•
water-treatment plants
•
dedusting plants
•
recooling systems
•
installations for soil sanitation.
6.2 Pumped liquids
CVM and CHM pumps are suitable for pumping clean, thin,
non-aggressive liquids, not containing solid particles or fibres. Do
not pump liquids that will attack the pump materials chemically.
delivery,
8.2 Short-time
7
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