3.2 Stopping the pump
To stop the pump, turn off the power. A built in anti-suck back valve installed in inlet flange will prevent air
from back flowing into the vacuum chamber after the pump is shutdown.
Caution: Do not use the anti-suck back valve as a check valve. Consult Airtech for
recommendations regarding check valves and other accessories.
Caution: The maximum number of motor starts per hour should not exceed 10 per hour.
Excessive starting of the motor can cause overheating and premature failure of the motor. A
minimum run timer should be used with a control panel to regulate starting and stopping of the
pump.
Caution: In applications, where the quantity of water vapor is moderate, it is recommended to run
the pump for 10 minutes at least with outside air prior to shut down to prevent the vapor from
condensing in the pump.
3.3 Operating Conditions
All VCX units are designed to run at the vacuum levels for continuous operation as stated in Section 6.0
(Technical Data). Operating above the maximum vacuum level may cause severe damage to the
machine. The vacuum regulator installed in inlet flange is set to the maximum allowable vacuum level at
the factory, and a desired vacuum level below the maximum level can be achieved by rotating the
adjustment knob.
Standard VCX units are for use of dry air only, and should not be used for hazardous areas. Handling of
humid air or gases containing aggressive chemicals is possible only with specially configures units.
Consult Airtech for assistance.
Excessive back pressure on the unit may result in excessive current draw. Do not operate the vacuum
pump over 2 psi back pressure.
For operating personnel working near the pump, ear protection is recommended. If noise below the
typical dBA is required, an external sound enclosure can be added to the system, provided adequate
ventilation is provided. Please consult Airtech for recommendations.
The ambient and suction air temperature must be between 41° F (5° C) and 104° F (40° C).
Caution: Failure to ensure proper operating conditions may lead to severe injury to persons and
damage to the pump.
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