VACUUBRAND RZ 8 - Manual (Page 11)

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.: 99 90 77 / 17/04/2008
page 11 of 20
Use and operation
Installing in a vacuum system:
☞ Avoid throttling losses by using connecting pipes with large diameter and keeping
them as short as possible.
☞ Reduce the transmission of vibration and prevent loading due to rigid pipelines.
Insert elastic hoses or flexible elements as couplings between the pump and rigid
pipes. Attention: Flexible elements tend to shrink if evacuated.
☞ Use a suitable valve to isolate the pump from the vacuum system if you need to
allow the pump to warm up before you pump condensable vapours or if you clean
the pump before it is switched off.
☞ Connect the exhaust to a suitable treatment plant to prevent the discharge of dan-
gerous gases and vapours to the surrounding atmosphere. Use a catchpot to pre-
vent the drainage of contaminated condensate back into the pump.
Prior to use:
☞ Max. ambient temperature: 40 °C.
☞ Ambient temperature should be at least 12 °C, because otherwise the pump possi-
bly does not start because of the high oil viscosity at low temperature.
☞ Check oil level of the rotary vane pump every time before starting the pump, how-
ever at least one a week. Check oil level more frequently if high gas or vapour
quantities are pumped.
☞ Make sure ventilation is adequate if pump is installed in a housing or if ambient
temperature is elevated. Keep a distance of min. 20 cm between fans and ambient
parts.
☞ If pump is installed in altitudes of more than 1000 m above mean sea level check
compatibility with applicable safety requirements, e. g. DIN VDE 0530 (motor may
overheat due to insufficient cooling).
☞ If the gas ballast valve is open, a power failure may cause unintentional ventilation
of the pump. In case this constitutes a potential source of danger, take appropriate
safety measures (e. g. install a electromagnetic operated gas ballast valve).
☞ Pumps with three phase motor: Check direction of rotation of the motor! Watch
the fan through the fan cover. Let the pump run for a few seconds and check if the
fan rotates in the indicated direction. If the direction of rotation is not correct, switch
off the pump immediately. Contact your local distributor for further information.
☞ When assembling, ensure vacuum-tightness. After assembly, check the complete
system for leaks.
During operation:
☞ The pump achieves its pumping speed, ultimate total vacuum and vapour pumping
rate only at operating temperature (after approx. 30 minutes).
☞ Operate the pump without gas ballast only with clean systems and without conden-
sable vapours.
☞ Let the pump run with gas ballast to reduce condensation of pumped substances
(water vapour, solvents, ....) in the pump or to decontaminate the pump oil from
volatile substances. The manual gas ballast valve is open if the arrow on the gas
ballast cap shows to the pump.
☞ Pumping down can be started at any pressure, max. at atmospheric pressure.
☞ Continuous operation is possible at any pressure below atmospheric pressure.
☞ Oil consumption increases at inlet pressures above 100 mbar. Check oil level at
shorter intervals.
☞ In case of pumping aggressive, corrosive or otherwise dangerous gases and va-
pours, take appropriate measures to protect pump and environment by using appro-
priate equipment such as cold trap, separator, oil separator, full flow oil filter, shut-
off valve as well as special oil.