If the pumps are rotating in the wrong direction,
rotation can be reversed by switching any two
main power leads to the panel. Correct rotation
should be con
fi
rmed in the previous manner.
Repeat the process of testing rotation for each
vacuum pump.
3B.3 Initial Operation
Using the “Hand-Purge/O
ff
-Auto” switch, start
pump by switching to “AUTO” (see Figure 3B.1).
WARNING:
Do not allow the vacuum pump to run
backwards.
WARNING:
Pumps that have reached operating
temperature may have a high surface
temperature on the top of the exhaust
mu
ffl
er.
DO NOT TOUCH!
3B.3.1 Testing the Pumps
Run the pump for two minutes in the correct
rotation. Stop the pump and top o
ff
the oil level
utilizing the oil
fi
ller port to the correct level as
shown in the sight glass.
DO NOT OPEN THE
FILLER PORT WHILE THE PUMP IS RUNNING.
After testing each pump, if everything appears
normal, put each pump into the “AUTO” mode
and allow each pump to run until vacuum builds.
Check for any leaks in the piping. Repair leaks, if
needed.
3B.3.2 Automatic Purge Operation
The system inlet piping contains an auto-purge
at each pump consisting of an isolation valve
and a purge valve. The purge system is used to
reduce the e
ff
ect of corrosive gas.
When vacuum demand is satis
fi
ed, the control
panel system begins the purge process. The
vacuum pump continues to operate, the electric
actuator closes the isolation valve, and the purge
solenoid valve opens, allowing fresh air to enter
the vacuum pump. This purge process runs for
7 minutes (default setting). After the set purge
time completes the purge valve will close and
the pump will turn o
ff
.
Figure 3B.2 Emergency Stop
1
2
Figure 3B.3 Cooling Fan Operation
View cooling fan here
Lubricated Rotary Vane Laboratory Vacuum Systems
4107 9021 88.01
3B-3
