HERZ
GmbH
BA HD240 02/2010 V.3.0 Rev. 2.0
11
Select the tube size and the couplings to minimize the pressure
drop, in particular:
•
Do not use tubing of a smaller diameter than the ports of the
unit; When installing units in parallel, size the manifold and
main conduit accordingly;
•
Utilise large radius bends and avoid using elbows;
•
Avoid using valves which have a reduced orifice relative to
the general system; Use swing check valves (utilising
lightweight discs) which have the lowest pressure drop,
rather than spring loaded check valves;
•
For oxygenation select low loss diffusers (lowest pressure
drop) and note that the pressure drop across plugs and
porous membranes will increase over time due to
progressive clogging.
A safety relief valve should be installed to avoid overloading the
unit as a result of pressure differential variations.
Make the electrical connections to the motor and check the
direction of rotation before connecting the conduit.
The ‘FJET’ blowers - exhausters are already supplied as
standard with silencers in the suction and exhaust ports (the
noise levels Lp and Lw, with piped inlet and outlet flow, are
detailed in SN 1867).
For operation into free air (either suction or discharge) the free
flow noise can be muffled with additional silencers.
In every situation avoid installing the unit on a structure, which
can transmit or amplify any noise (tanks, sheet metal etc.).
Installation sketches - please refer to next page.
Further information should be requested regarding additional
noise reduction by installing the unit in soundproof enclosures.
1.3.2
ELECTRIC MOTOR
WARNING
BEFORE UNDERTAKING ANY OPERATION ENSURE THAT
THE UNIT IS DISCONNECTED FROM THE ELECTRICITY
SUPPLY.
The electric motor has been selected for service in an ambient
temperature between -15°C and +40°C at an altitude no higher
than 1000 m. Ensure that the information on the nameplate is
consistent with the supply voltage and frequency.
Variations in the supply voltage up to ± 10% are acceptable.
Outside the normal operating conditions the motor cannot deliver
full power and problems can arise with starting, especially for
single-phase motors.
Make the electrical connections referring to the wiring diagram in
the terminal box, connecting an earth cable of adequate capacity
to the earth terminal.
The fuses are designed only for short circuit protection and not
to safeguard the motor. Therefore overload cut-outs
(temperature or current) are essential to guard against the risk of
overloads on the motor --- for example failure of one line in a
three phase supply, an excessively high start up frequency,
unacceptable variations in the supply voltage, stalled rotor, etc..
Set the overload cutouts at the nominal current specified on the
nameplate.
The fuses should be rated for the peak currents or use “slow
blow” fuses especially in applications of direct starting.
THE ENTIRE GUARANTEE SHALL CEASE TO APPLY WHEN
INADEQUATE PROTECTION IS PROVIDED.
1.3.2.1 CURRENT MEASUREMENT
The current drawn refers to normal operating conditions.
Departures from the nominal operating conditions can result in
variations of 10%.
There can be small differences in the measured value of each
phase. These are tolerable up to a maximum deviation of 9%
(ref. IEC 34-1).
1.4
COMMISSIONING
To commission the unit:
•
Set the operating pressure or vacuum using a suitable
gauge.
•
Check the relieving pressure of the safety valve.
•
Measure the current drawn by the motor and verify that it is
within the limit stated on the name plate (refer to Para.
1.3.2.1).
•
Adjust the overload cutouts accordingly.
•
After one hour's operation, repeat the current
measurements and verify that they are still within the stated
limits.
1.5
OPERATING ADJUSTMENTS
The ‘FJET’ blowers - exhausters will automatically generate the
driving pressure required at the point of use.
Since the power absorbed and the operating temperature is
primarily a function of the driving pressure, it is possible that
these can exceed the permitted operating conditions for the unit.
Frequently the pressure losses of the tubing are overlooked as
the major factor determining the driving pressure.
The driving pressure can be reduced by eliminating all possible
obstructions and restrictions in the flow path. If it is still too high,
the flow can be reduced by installing a bypass valve.
Never choke the flow by throttling the suction or the discharge.
1.6
MAINTENANCE
After every 10-15 days of use clean the cartridge filter. Replace
the cartridge frequently in dusty environments.
A dirty filter will create a strong suction resistance and
consequently a higher driving pressure, a higher operating
temperature and an increase in the absorbed power.
Check that the driving pressure does not change over time.
It is important that a unit in service is subjected to periodic
inspections by qualified personnel to insure against failures,
which, directly or indirectly, could cause damage.
Departures from the normal operating conditions (e.g. a rise in
the absorbed power, unusual operating noises, vibrations, etc.)
are a sign of abnormal operation, which can lead to failure.
In the event of difficulties please contact CBI or the relevant
sales agent.
Please note that repairs undertaken by a third party will
invalidate the guarantee.
Periodically remove any surface deposits which otherwise can
cause the operating temperature to rise.
Commitments, agreements or legal relationships are
governed by the corresponding sales contract. The above
items are in no way limited by the contents of this manual.
The quality of the materials and of the workmanship is
guaranteed as set out by the standard conditions of sales.
The guarantee is not valid for the following: damage
incurred during transport; inadequate storage; faulty
installation; incorrect use; exceeding performance limits;
electrical or mechanical miss-use.
Store the packaging for possible future use.