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 ‘SCL K’ blowers - exhausters are already supplied as standard
with silencers in the suction and exhaust ports (the noise levels Lp /
Lw, with piped inlet and outlet flow, are detailed in PERFORMANCE
TABLE - page 3).
For operation into free air (either suction or discharge) the free flow
noise can be muffled with additional silencers.
In every installation, avoid mounting the unit on structures that could
transmit or amplify sound (such as tanks, sheet metal plating, 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 ‘SCL K’ 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
Any maintenance, installation, moving or re-positioning of the intake /
exhaust manifolds needs to take place with the machine turned off and
the electrics disconnected.
Even with the unit turned off, the impeller is able to spin manually-use
caution to avoid any pinching / cutting. Utilize appropriate work
clothes/protection devices.
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.
See paragraph 5 - TROUBLESHOOTING to be dealt with and/or
avoiding possible breakage or faults.
Under normal working conditions (refers to PERFORMANCE TABLE -
page 3) the machine’s bearings should be replaced by qualified
personnel after 25,000 working hours max or 4 years.
In the event of difficulties please contact F.P.Z. 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.
GB - 13/38
