Safety instructions
20901334_EN-US_PC3000 VARIO select Serie_V1.4_061022
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2.8 Possible sources of danger
Considering mechanical stability
Observing mechani-
cal stability
Due to the high compression ratio of the pumps, a higher pressure
can build up at the outlet than the mechanical stability of the sys-
tem allows.
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Always ensure that the exhaust line is open and free of pres-
sure. To guarantee an unobstructed emission of gases, the out-
let must remain unblocked.
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Prevent uncontrolled excess pressure, e.g. due to shut-off or
blocked piping system, condensate or clogged exhaust line.
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At the gas connections, the connections for inlet (IN) and outlet
(EX) must never be confused.
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Observe the max. pressure at the inlet and outlet of the pump
as well as the max. permissible differential pressure between
inlet and outlet, in accordance with the technical data.
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The system to be evacuated and all hose connections must be
mechanically stable.
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Attach the coolant hoses to the hose nozzles so that they do not
come loose unintentionally.
Preventing condensate return flow
Preventing backlog
in the exhaust line
Condensate can damage the pump head. Condensate must never
flow back through the hose line into the outlet and into the pump
head. Liquid is not allowed to collect in the exhaust line.
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Prevent condensate return flow by using a separator. Conden-
sate is not allowed to enter the inner housing through the hose
lines.
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If possible, lay the exhaust hose so that it is descending from
the outlet; i.e. running downward, so that no backlog can form.
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Incorrect measurement due to blocked vacuum line, e.g. con-
densate in the vacuum line can distort the measurements of the
vacuum sensor.
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Prevent excess pressure in the suction hose (>/ 1060 mbar
[>/ 795 Torr]).
