NAKAYAMA NP 2000 Series Water Pumps Owner’s Manual

NAKAYAMA NP 2000 Series Water Pumps

Technical Data

Handling

The product must be lifted and handled with care.
Applications
Designed to handle clean non-aggressive water free of gases. Typical applications. Domestic water supply irrigation, pressure boosting, liquid transfer

Working Limits
NOTE: All pump models are suitable for domestic use provided the water temperature does not exceed 35°C.

• Max. Ambient Temperature: 40° C
• Max. Number of starts per hour: 40

Proper installation

• A. Eccentric adapters
• B. Positive lift
• C. Good immersion
• D. Wide bends
• E. Suction pipe >= pump port diameter
• F. Suction lift
• G. Pipes must not exert stress on pump but on independent supports
• H. Foot valve

Improper installation

1. Light bends: high flow resistance
2. Insufficient immersion: air suction
3. Negative lift: air pockets
4. Pipe diameter pump < port diameter: high flow resistance

Electrical Connection

To connect, proceed as shown on the back of the terminal board cover and in Fig.4 for single-phase versions, and Fig.5 for three-phase versions. Use standard 3-wire cables (2+ground) for single-phase versions, and 4-wire cables (3+ground) for three-phase versions. The reference characteristics (voltage, frequency, and input current) are on the pump rating plate. The single-phase pumps have built-in, automatic reset thermo-amperometric protection; the three-phase pumps must always be supplied through a magneto-thermal overload cut-out set to the rated current. For ambient temperatures of 400C to 450C, supply cables with temperature characteristics of at least 950C and a minimum wire gauge of 1.5mm2 must be used.
Check the direction of rotation (three-phase models only)
Counter-clockwise rotation when looking at the pump from being motor side. Check by looking at the fan or by observing the pump’s performance, the correct direction of rotation is the one that generates the highest Q/h performance. In the event of incorrect rotation, switch two supply wires.

Priming

Fill the pump body and suction pipe through the fill plug, bleeding off the air. For the pumps which are equipped with a foot valve, a self-priming without the foot valve may require up to 3-4 minutes. We, therefore, recommend that you always use a foot valve.

Maintenance
The pump should be serviced by qualified personnel only, after having been disconnected from the power mains. No routine maintenance is required.

Safety Instructions

• Pay attention to the working limits (Par. 3). Improper use may damage the pump and other property, and injure people.
• The pump is not suitable for use with flammable or dangerous liquids.
• Make sure that the rated voltage and the mains voltage are compatible.
• The connections to the mains and grounding must be executed by qualified personnel (authorized electrician) in compliance with local installation standards.
• Connect to the power mains using a multi-pole power switch with a switch-contact gap of at least 3 mm. As additional protection from lethal electrical shock, install a high-sensitivity differential switch (0.03A).
• Make sure that unauthorized people do not have access to the pump.
• Disconnect the power supply to the electric pump or unplug the machine before carrying out any maintenance, cleaning or handling operations. If the power cord is damaged it rust be replaced by qualified personnel to ensure against hazards.
• Use the pump only within the limits specified on the rating plate.
• Do not run the pump with the port closed.
• Be alert to hazardous situations by power failure.
• Protect the pump from the weather.
• Caution! Avoid icing.
• Make sure the motor is properly ventilated. Warning: the motor can reach a temperature of 700C.

Troubleshooting

The Pump Does Not Start:

• Check the power supply.
  Reset the ground fault interrupter or circuit breaker if it has triggered. The thermo-amperometric protection incorporated in the single-phase versions may have activated: It will reset automatically once the motor has cooled.

The Motor Starts But The Pump Does Not Deliver:

• The pump is sucking in the air:
  Check the liquid level, the tightness of the suction pipe, and the operation of the foot valve.

The Pump’s Delivery Is Reduced:

• Check for throttling and direction of rotation in three-phase models.

The Pump Stops Occasionally:

• Triggering of thermo-amperometric protection(single-phase version)or of temperature relay due to excessive current input: Contact an Authorized Service Centre.

The manufacturer reserves the right to make minor changes to product design and technical specifications without prior notice unless these changes significantly affect the performance and safety of the products. The parts described/illustrated in the pages of the manual that you hold in your hands may also concern other models of the manufacturer’s product line with similar features and may not be included in the product you just acquired.
Please note that our equipment has not been designed for use in commercial, trade, or industrial applications. Our warranty will be voided if the machine is used in commercial, trade or industrial businesses or for equivalent purposes.
To ensure the safety and reliability of the product and the warranty validity, all repair, inspection, repair, or replacement work, including maintenance and special adjustments, must only be carried out by technicians of the authorized service department of the manufacturer.

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