Notice – VACUUBRAND MZ 2 VARIO-SP User Manual
Page 33
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Operation with silencer at the outlet: Operating the
pump at a high inlet pressure or pumping dusty gas-
es for a long time may cause clogging of the silencer.
Check the silencer regularly and replace if necessary,
or install a hose nozzle (order no. 639758) with clamp-
ing ring (order no. 639729) instead.
• If the pump is installed at an altitude of more than 6500
ft (2000 m) above mean sea level, check compatibility
with applicable safety requirements, and adopt suit-
able measures. There is a risk of the motor overheat-
ing due to insufficient cooling.
• Check compatibility with the
maximally permitted
pressure at outlet and the maximum pressure dif-
ference between inlet and outlet ports.
Do not start the pump if the
pressure difference between
inlet and outlet ports exceeds max. 16.0 psi (1.1 bar).
Attempts to start the pump at higher pressure difference
may cause stalling and damage of the motor.
Prevent internal condensation, transfer of liquids or dust.
The diaphragms and valves will be damaged, if liquids are
pumped in significant amounts.
Check the pump regularly for external soiling and depos-
its. Clean the pump if necessary to avoid an increase of
the pump’s operating temperature.
A temperature sensor at the circuit board protects the mo-
tor: Current limitation in case the temperature at the circuit
board raises above 158°F (70°C). At very high tempera-
tures the pump is switched off.
Note: Only manual reset is possible. Disconnect the pump
from the power source. Identify and eliminate the cause of
failure.
Avoid overheating (e.g., due to hot process gases).
A warm up period (approximately 15 min.) is required to
ensure that the rated ultimate vacuum and pumping speed
are attained.
NOTICE