Heidolph ROTAVAC Vario pumping unit - Manual (Page 20)

page 20 of 61
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.: 999248 / 28/04/2011
4.4 During operation
• Maximum ambient temperature: 40 °C
• Make sure ventilation is adequate if pump is installed in a housing or if ambient
temperature is elevated.
• Potentially dangerous gases or vapours 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.
If pumping condensable vapours (water vapour, solvents, ....), let the pump run with
gas ballast to reduce condensation in the pump.
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 over-
heat due to insufficient cooling).
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.
Check compatibility with maximally permitted pressure at inlet and outlet.
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.
The motor is protected by a temperature sensor at the circuit board: Current
limitation if the temperature at the circuit board is higher than 70°C, switching off the
pump if the temperature is higher than 85°C. In case of blockade of the motor (after
10 attempts to start-up) the pump is switched off.
If the pump is switched off due to safety measures, manual reset is necessary. Iso-
late the pump from mains. Eliminate cause of failure before restarting the pump.
Avoid high heat supply (e. g. due to hot process gases).
A warm up period (approx. 15 min.) is required to ensure that rated ultimate vacuum
and pumping speed are attained.
NOTICE
• The gas outlet (hose nozzle 10 mm) must not be blocked. The exhaust pipeline
has always to be free and pressureless to enable an unhindered discharge of
gases.
• If necessary connect the exhaust to a suitable treatment plant to prevent the dis-
charge of dangerous gases and vapors to the surrounding atmosphere.
• 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).
• Ensure that the coolant outlet pipeline is always free and that it cannot get
blocked.
• Maximum permissible coolant pressure at the condensate cooler: 6 bar (abso-
lute)
• Install coolant valves always in the supply line of the waste vapor condenser only.
• 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).