NEVER SWITCH OVER THE CONNECTOR BUTTON WHEN THE PUMP MOTOR IS ALIVE!
6. Bringing pumps into operation
With the pumps of types NC, NCD (NCM, NCDM) the rotor of electric motor is submerged and provided with
water-lubricated bearings. Before putting the pump into operation, it has to be filled with water and deaerated.
Deaerate the pump by unscrewing a screw on the back side of the electric motor (Fig. 1 – Pos. 5). Air will flow
out through the cleft between the motor shaft and bearing. When water starts to flow out, close the valves at
both the suction and pressure side of the pump. Start the pump and check the direction of shaft rotation. It
has to match that indicated on the electric motor nameplate (Fig. 1 – Pos. 6). In case of a wrong direction,
interchange with the three-phase pumps the phases L1 and L2 (Fig. 4). For single-phase pumps the rotation
direction is always correct. When a correct rotation of the pump shaft has been established, tighten the screw
(Fig. 1 – Pos. 5), and open the valves at both the suction and pressure side of the pump.
7. Maintenance of pumps
The pumps are high-quality products. For that reason they can operate in normal conditions several years
without maintenance. If a pump didn't operate for a long period of time, it can be blocked when attempting
to start it. To deblock it proceed as follows: Switch off the pump, unscrew the vent screw, and with a
screwdriver inserted into the shaft slot rotate the shaft until the friction forces have released. Then screw
on the vent screw.
NOTE: DEAERATE AND START UP THE PUMP ONLY WHEN THE CONNECTOR IS SWITCHED TO SPEED (3).
8. Lifetime of the product, provision period for spare parts
This is the time period when the supply of spare parts and serviceability will be ensured in order to ensure
normal operation of the product under normal operating conditions, and under observance of the engineering
instructions. The lifetime of this product is 7 years following the warranty expiration date.
9. Risks encountered during the maintenance and use
- Don't use the pump for pumping inflammable substances.
- Disconnect the pump from the electric mains before any intervention at the switch cabinet.
- During the operation and with high temperatures of the pumping fluid the pump will warm up.
Don't touch it – risk of burns!
- The pumping fluid can be very hot and under high pressure. The risk of scalding is present, therefore empty
the piping system before proceeding to dismantling operations.
- When deaerating the pump very hot fluid can squirt out. Take care not to injure people or damage the
environment.
- If the pump is out of operation during the winter period, take care to prevent the fluid in it from freezing that
could result in damaging the pump.
Changes reserved.
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