Elmo Rietschle V-VC 202/303 - Manual (Page 13)

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4.1.1 Data plate
Fig. 3 Data plate
4.2 Description
V-VC 202 and V-VC 303 have a micro fi lter on the intake side and an oil and oil mist separator for the return
of the oil to the oil system on the outlet side. The vacuum pump is housed in a sound cover. A fan between
the pump housing and the motor cools the air in the pump housing and cools the circulating oil.
An integral non-return valve prevents the evacuated system from being ventilated after the pump has
stopped. If the machine has been idle for more than two minutes the connected pipe should be ventilated to
atmospheric pressure.
A gas ballast valve fi tted as standard (Fig. 2/U) prevents condensation of water vapour in the inside of the
pump when low amounts of steam are sucked in when the pump is at operating temperature. A reinforced
gas ballast (optional) can be used if there is a higher amount of water vapour.
The pumps are driven by standard fl anged three-phase motors using a coupling.
4.3 Areas of application
These oil-fl ooded rotary vane vacuum pumps V-VC 202 and V-VC 303 are suitable for producing vacuum.
The nominal pumping capacity with free suction is 200 and 300 m
3 /h at 50 Hz. Data sheet D 232/20 shows
the dependency of the pumping capacity on the intake pressure.
These types are suitable for the evacuation of closed systems or for a continuous vacuum within the follow-
ing intake pressure ranges: 0.5 to 500 mbar (abs.).
If the machine is operated continuously outside these ranges there is the risk of oil leaking through the outlet
opening. When evacuating closed systems the volume to be evacuated must be no more than 2% of the
nominal pumping capacity of the vacuum pump.
For permanent operation of > 100 mbar (abs.) the next larger motor output must be used.
If the unit is switched on more frequently (at regular intervals of about 10 times an hour) or at
higher ambient temperatures and intake temperatures, the excess temperature limit of the motor
winding and the bearings may be exceeded.
Please contact the manufacturer should the unit be used under such conditions
If it is installed in the open air the unit must be protected from environmental infl uences, (e.g. by a
protective roof).
1 Type/ Size (mechanical version)
2 Serial number
3 Year of construction
4 Item no.
5 Ultimate vacuum (abs.)
6 Suction capacity 50 Hz / 60 Hz
7 Speed 50 Hz / 60 Hz
8 Motor output 50 Hz / 60 Hz
9 Operating mode