Attention: Important Notes Regarding The Use Of Gas Ballast - vacuubrand ME 4C NT VARIO Instructions For Use Manual

If pumping condensable vapours (water vapour, solvents, ....), let the pump run with
gas ballast to reduce condensation in the pump.
Operation with silencer at the outlet: Operating the pump at high inlet pressure or
pumping dusty gases for a long time may cause clogging of the silencer. Check the
silencer regularly and replace if necessary.
In case of excess temperature, the motor is shut down by a thermal cutout in the
winding. Attention: Reset possible only manually. Confirm error message at control-
ler by pressing key START/STOP or switch off the pump or isolate the equipment
from mains. Determine and eliminate the cause of failure. Wait approx. five minutes
before restarting the pump.
Check fan (underside the pump) regularly for dust/dirt. Clean if necessary.
A warm up period (approx. 15 min.) is required to ensure that the rated ultimate
vacuum and pumping speed are attained.

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.
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 vapour condenser.
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.: 999164 / 19/05/2009
page 23 of 75
In case of condensable vapours (water vapour, solvents, ...):
☞ Do not pump vapour until the pump has reached its oper-
ating temperature.
gas
☞ Open gas ballast valve. The gas ballast valve is open if the ar-
ballast
row on the gas ballast cap shows towards the marking "GB".
(open)
☞ With gas ballast valve open ultimate vacuum will be re-
duced, pumping speed is decreased.
☞ Use inert gas at the air inlet to avoid the formation of explo-
sive mixtures.
☞ Close gas ballast valve by turning it 180°.