
In some cases, it will not be possible to use the wand assembly because it will be too
long to fit into the area to be pumped. In these cases, pumping vacuum can be
achieved in the tank by turning off the 2” ball valve located at the back of the tank.
Then, simply put the 2” hose, less the wand assembly, into the liquid to be pumped
and open the suction line ball valve at the tank. When pumping is complete, turn the
ball valve at the tank to the “off” position, and turn the controller off.
Sometimes, to be able to pump only small amounts of liquid that remain on the bottom
of a tank, it is necessary to increase the velocity of air flow to pump these small
amounts of liquid out. In these circumstances, the unit is pumping both air and liquid.
In most instances, it is important to keep the wand submerged in the liquid at all times
to maintain tank vacuum at 20” Hg for maximum speed pumping. However, for small
amounts of liquid, air velocity can be increased by closing the wand ball valve to about
half way to three quarters. This will increase air flow so that air and water can be
pumped at the same time.
Pressure or Off-Load Mode
The Conde ProVac is equipped with pressure off-loading capacity. For safety consid-
erations, the Conde ProVac is factory set to off-load at a maximum of 5 psi. This will
lift waste approximately 10 feet high. Higher off load capabilities are possible by ad-
justing the pressure relief valve (item #2). The pressure relief valve should never be
adjusted to over 10 psi.
Before attempting to run the Conde ProVac in the Pressure or Off-Load Mode,
make sure all fittings and valves are secure. Severe injury may result if fittings
are not secure when the ProVac is in the Pressure Mode.
To off-load the Conde ProVac, detach the suction line from the quick disconnect at the
suction line ball valve (item #4). First make sure that the suction line 2” ball valve is
closed as is the discharge 2” ball valve (item #3). Reattach the 2” suction line to the
discharge ball valve, attach or move the hose to the vessel to receive the contents of
the ProVac, and open the discharge ball valve. Now, turn the controller to “Pressure”.
It is possible to verify that the ProVac is in the pressure mode by observing the gauge
located on the front of the unit. The gauge should now show pressure building in the
tank and the needle should read pressure or “PSIG”. The ProVac will build only
enough pressure to completely off load the unit. If, on the other hand, the unit is turned
on to the pressure mode first before opening the discharge ball valve, the unit will be-
gin to build pressure until the pressure relief valve (item #2) on top of the tanks opens
and begins to relieve air to atmosphere.
The unit can also be off-loaded by attaching a suction line to the discharge pipe from
another vacuum pumping source, such as a vacuum truck. Before pumping out the
Unit, make sure that the suction line ball valve is open to provide a vent for pumping.
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