ISTRUZIONI ORIGINALI
TECHNICAL INFORMATION
23/43
87-900-136-01
Suggestions for use
When the room temperature is lower than 10 °C, it
is a good practice to let the pump operate (at
maximum vacuum level) for about 5 minutes. Dur-
ing this period the pump may not reach the stated
pressure limits.
CAUTION
Avoid operating the pump for long periods with in-
let port vented to atmospheric pressure. This will
cause a heavy oil loss.
CAUTION
Avoid frequent stop-start cycles, as this will lead to
premature coupling elastic element wear.
It is advisable not to exceed 10 cycles/hour.
For more frequent cycles, it is recommended to
install a progressive starter (soft starter) or a
star/delta starter.
When using a star/delta starter, the vacuum pump
can start exclusively with the inlet vented to at-
mospheric pressure.
Water vapour suction
In order to pump down any water vapour, it is es-
sential to bring the pump temperature to its operat-
ing value. In case there are other condensates in
the oil, let the pump run for at least thirty minutes
with the gas ballast valves in position “open”, at
the end of the working cycle.
It is advisable to carry out this operation before
stopping the pump for a long time. The gas ballast
valve will allow the elimination of water condensate
from lubricating oil.
NOTE
For repetitive work cycles, with brief time intervals
in between, it is better not to stop the pump.
STOPPING THE PUMP
There are no special procedures for switching the
pump off; it needs only to be disconnected from
the electric power.
When the pump is stopped, the anti-suckback de-
vice makes it possible to maintain vacuum in the
vessel connected on the inlet flange of the pump.
If the pump is expected to be stopped for a lengthy
period, or in any case if it has pumped in large
amounts of vapors, it is good practice to run it with
the gas ballast open and the inlet line closed for a
few minutes before switching off in order to limit
the risk of corrosion or scaling due to pollution of
the oil by condensed vapors.
SAFETY RULES
Personnel responsible for pump operation and
maintenance must be well-trained and must be
aware of the accident prevention rules.
The accident prevention precautions contained in
this section must be respected at all times during
operation and maintenance of the pump to avoid
damage to operators and to the pump.
These precautions are provided in the form of
WARNING and CAUTION notes.
WARNING!
Operating procedures, technical information and
precautions which, if not respected and/or imple-
mented correctly may cause body harm to opera-
tors.
CAUTION
Operating procedures, technical information and
precautions, which, if not respected and/or imple-
mented correctly, may cause damage to the pump.
WARNING NOTES
a. Death may result from contact with high volt-
ages. Always take extreme care and observe
the accident prevention regulations in force.
b. Always disconnect the power supply to the
pump before maintenance work. Place a spe-
cial warning signs over the power supply
breaker switch: MACHINE UNDERGOING
MAINTENANCE - DO NOT POWER ON.
c. If you are performing maintenance after the
pump has been operating for a considerable
time, allow sufficient time for it to cool as the
external surface temperature may be in ex-
cess of 80°C.
d. Failure to provide the pump with an earth con-
nection may cause serious damage to opera-
tors. Always ensure that there is an earth
connection and that it complies with the stan-
dards.
e. When cleaning the pump and its component
parts, avoid the use of flammable or toxic sol-
vents, such as benzin, benzol, ether or alco-
hol. The recommendation is to use a soap and
water solution, preferably in ultrasound wash-
ing machines, taking care to dry all the
cleaned parts at temperatures under 100 °C in
order to eliminate residual moisture.
f. Prolonged overloads or breakdowns may
cause the electric motor to overheat, and to
release noxious smoke; remove the power
immediately as a precaution and do not ap-
