DAB CP-G Series, Instruction For Installation And Maintenance

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ENGLISH
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4.2 New systems
Before running new systems the valves, pipes, tanks and couplings must be cleaned accurately. Often welding waste, flakes of oxide or
other impurities fall off after only a certain period of time. To prevent them from getting into the pump they must be caught by suitable
filters. The free surface of the filter must have a section at least 3 times larger than the section of the pipe on which the filter is fitted, so
as not to create excessive load losses. We recommend the use of TRUNCATED CONICAL filters made of corrosion-resistant materials
(SEE DIN 4181):
1- Filter body
2- Narrow mesh filter
3- Differential pressure gauge
4- Perforated sheet
5 Pump intake aperture
5. PROTECTIONS
5.1 Moving parts
In accordance with accident-prevention regulations, all moving parts (fans, couplings, etc.) must be accurately protected with special devices (fan
covers,ecc.) before operating the pump.
During pump operation, keep well away from the moving parts (shaft, fan, etc.)
unless it is absolutely necessary, and only then wearing suitable clothing as required by law, to avoid being caught.
5.2 Noise level
The noise levels of pumps with standard supply motors are indicated in table A on page 73.
Remember that, in cases where the LpA noise levels exceed 85 Db(A), suitable HEARING PROTECTION must be used in the place of installation,
as required by the regulations in force .
5.3 Hot and cold parts
DANGER OF BURNING!!
As well as being at high temperature and high pressure, the fluid in the system may also be in the form of steam!
It may be dangerous even to touch the pump or parts of the system.
If the hot or cold parts are a source of danger, they must be accurately protected to avoid contact with them.
6. INSTALLATION
−
To protect the pump against deposits, it is advisable to install it in the lowest point of the system. Fit the pump in the plant only after
having completed the welding works and checked that the plant is quite clean.
−
The electropump must be fitted in a well ventilated place, protected from unfavourable weather conditions and with an environment
temperature not exceeding 40°C.( Fig.B ). Electropumps with degree of protection IP55 may be installed in dusty and damp
environments. If installed in the open, generally it is not necessary to take any particular steps to protect them against unfavourable
weather conditions.
−
The pump may be fitted either on the delivery or on the return pipe, with the motor axis in horizontal or vertical position, as long as the
terminal board box is never facing downwards (Fig.C) so as to avoid dangerous water infiltrations in the case of leaks.
−
It is possible to install the pump with the standard brackets (fig. 8)
− To facilitate checking and replacement operations, install the pump in a position with easy access.
− The arrows on the pump body indicate the direction of flow. It is recommended to use interception gate valves on the intake and delivery
pipes, to prevent drainage of the system when it is to be repaired. Fit also a by-pass circuit between delivery and intake to guarantee
minimum recycling if electrovalves are used in the pipes, so as to avoid the creation of dangerous temperature rises.
− Ensure that the plant is provided with an air bleeding system and that the expansion chamber (if provided) is installed before the intake
aperture. If the pump is installed on the delivery of an open vessel circuit, ensure that the safety pipe is connected before the pump.
−
When fitting the pump on the system, ensure that the metal pipes do not weigh down on the pump body, transmitting excess forces or
stress that could cause cracks or breakages.
−
To avoid transmitting noise and vibrations, fit vibration-damping couplings on the intake and delivery apertures .
7. ELECTRICAL CONNECTION
Scrupulously follow the wiring diagrams inside the terminal board box and those on page 74 of this manual.
The electrical connections must be made exclusively by skilled personnel as required by the safety regulations in
force.
The requirements of the electric energy supply company must be scrupulously complied with. In the case of three-
phase motors with star-delta start, ensure that the switch-over time from star to delta is as short as possible and that it falls
within table B on page 73.
−
Before opening the terminal board and working on the pump, ensure that the power has been switched off.
− Check the mains voltage before making any connection. If it is the same as the voltage on the data plate, proceed to connect
the wires to the terminal board, giving priority to the earth lead. (Fig. D ).
−
The pumps must always be connected to an external switch .
−
Single-phase motors are provided with thermal overload protection and may be connected directly to the mains.
−
Three-phase motors must be protected with special remote-control motor-protectors calibrated for the current shown on the
plate.
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