Heidolph ROTAVAC 20 - Manual (Page 18)

Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check carefully
the validity of this document with respect to his product. Manual-no.: 01-005-005-36-1
page 18 of 35 Translation of the original instructions
4.3 During operation
➨ Potentially dangerous gases or vapors at the outlet of the pump have to be
drained and disposed appropriately.
+ Due to the high compression ratio of the pumps, pressure at the outlet port might
be generated being higher than the maximum permissible pressure compatible
with the mechanical stability of the system. Ensure that the pump outlet cannot
become blocked or restricted.
+ Maximum ambient temperature: 40 °C
Make sure ventilation is adequate if pump is installed in a housing or if ambient
temperature is elevated.
• If pump is installed in altitudes of more than 1000 m above mean sea level check
compatibility with applicable safety requirements, e. g. IEC 60034 (motor may
overheat due to insufficient cooling).
• Check compatibility with maximally permitted pressures at inlet and outlet.
Do not start the pump if the pressure at outlet port exceeds maximum 1.1 bar
(absolute). Attempts to start the pump at higher pressures may cause blockade and
damage of the motor.
If pumping condensable vapors (water vapor, solvents, etc.), let the pump run with
gas ballast to help purge any condensation in the pump.
Prevent internal condensation, transfer of liquids or dust. The diaphragm and valves
will be damaged, if liquids are pumped in significant amounts.
Check the pump regularly for external soiling and deposits, clean if necessary to
avoid an increase of the pump‘s operating temperature.
In case of overload, the motor is shut down by a self-hold thermal circuit breaker
in the winding.
Note
: Only a manual reset is possible. Switch off the pump and disconnect the elec-
trical power cord. Identify and eliminate the cause of failure. Wait approximately five
minutes before restarting the pump.
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
NOTICE
• Attention: Install hoses of the cooling system in a way to avoid flow / dropping of
condensed water onto the pumping unit (especially cables and electronic parts)
(see degree of protection IP).
• Ensure that the coolant outlet pipeline is always free and that it cannot get
blocked.
• Maximum permissible coolant pressure at the exhaust waste vapor condenser:
6 bar (absolute)
• Comply with the maximum permissible coolant pressures of additional compo-
nents in the coolant circuit (e.g cooling water valve).
• Avoid overpressure in the coolant circuit (e.g. caused by blocked or squeezed
coolant hoses).
• Only install an optional coolant valve in the supply line of the exhaust waste vapor
condenser.