Heidolph ROTAVAC vario control - 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.: 999223 / 08/07/2009
page 18 of 34
In case of condensable vapors (water vapor, solvents, ...):
☞ Do not pump vapor until the pump has reached its opera-
ting temperature.
☞ Open gas ballast valve.
☞ The gas ballast valve is open if the arrow on the gas bal-
last cap points downwards.
☞ With gas ballast valve open ultimate vacuum will be reduced, pumping speed is
decreased.
☞ Use inert gas at the air inlet to avoid the formation of explosive mixtures.
☞ Close gas ballast valve by turning it 180°.
In case of low boiling solvents when the formation of condensate is unlikely, the use
of gas ballast might be unnecessary.
Operating the pump without gas ballast increases the solvent recovery rate at the
exhaust waste vapor condenser (accessory).
Attention: Notes concerning the operation of the exhaust waste vapor conden-
ser (accessory)
☞ 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.
☞ Connect the exhaust to a suitable treatment plant to prevent the discharge of
dangerous gases and vapors to the surrounding atmosphere.
☞ Ensure that the coolant outlet pipeline is always free and that it cannot get
blocked.
• Check the overpressure safety relief device at the exhaust waste vapor con-
denser regularly, replace if necessary. Check especially for conglutination and
cracks.
• 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 coolant valve).
• Install optional coolant valves always in the supply line of the waste vapor con-
denser only.
• Avoid overpressure in the coolant circuit (e.g. caused by blocked or squeezed
coolant hoses).
• In case of condensation: Check liquid level in the catchpot during operation.
Avoid overflowing of the catchpot.
4.5 Attention: Important notes regarding the use of gas ballast
➨ When using air rather than inert gas, risk of significant damage to equipment and/
or facilities, risk of personal injury or even loss of life exists due to the formation
of hazardous and/or explosive mixtures if air and pumped media react inside or
at the outlet of the pump.
➨ Make sure that air/gas inlet through the gas ballast valve never leads to hazard-
ous, explosive or otherwise dangerous mixtures. If in doubt, use inert gas.
gas
ballast