Notice – VACUUBRAND PC 620 NT User Manual
Page 20
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.: 999188 / 19/05/2009
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 rates at the
exhaust waste vapour condenser.
• Check the overpressure safety relief device at the exhaust waste vapour conden-
ser regularly, replace if necessary. Check especially for sticking and cracks.
• In case of
condensation: Check liquid level in both catchpots during operation.
Avoid overflowing of the catchpots.
Use level sensor if necessary (see ”Accessories”).
Do not overfill the catchpots. Maximum liquid level approx. 80%, to avoid problems
when removing the catchpots.
Check liquid level in both catchpots regularly and drain catchpots in time. In case,
install level sensor (see “Accessories“).
Permissible range of coolant temperature at the exhaust waste vapour condenser:
-15°C to +20°C
Check hose connections prior to starting operation of the cooling system.
Check coolant hoses regularly during operation.
Attention: Notes concerning the operation of the exhaust waste vapour con-
denser
In case of
condensable vapours (water vapour, solvents,
...):
☞
Do not pump vapour until the pump has reached its oper-
ating temperature.
☞
Open gas ballast valve. The gas ballast valve is open if
the arrow on the gas ballast cap shows towards the mark
”GB”.
☞
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, if necessary.
☞
Close gas ballast valve by turning it by180°.
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
NOTICE
Attention: In case of supply voltage below 100V, the lock of the cutout might be
restricted and the pump might restart on its own after sufficient cooling down. Take
suitable precautions, if an automatic restart of the pump may lead to a critical dan-
gerous situation.
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.