Prochem Legend SE AD - Manual (Page 23)

OPERATION
LEGEND SE 980059 06/19/03 3-15
VACUUM SYSTEM
An exhaust diverter valve is located on the engine
exhaust system. This directs the exhaust either to
the heat exchanger for high temperature cleaning or
to the exhaust muffler for low temperature cleaning
or extraction, such as for flood restoration.
When the diverter valve is in the MUFFLER position,
a relay automatically shuts off the water pump. An
override switch on the control panel will enable you
to turn the water pump ON, for low temperature
cleaning.
.
See Figure 16. Vacuum flow is initiated by the
vacuum pump, with air and water being drawn into
the vacuum inlet at the front of the con-sole.
The mixture then flows through a strainer basket into
the waste tank. Air exits the waste tank through a
100-mesh filter, and then flows into the vacuum
pump. A vacuum pump relief valve has been
provided for vacuum pump protection.
The air is discharged from the vacuum pump
through the stage one heat exchanger where the
heated vacuum exhaust blows across a radiator-
type heat exchanger before discharging into the
atmosphere.
A level sensor switch located near the top of the
waste tank will shut the unit down before the waste
tank reaches its full capacity. This protects the
vacuum pump from water damage.
Use of a DEFOAMER will help prevent damage to
the unit by a build-up of foam in the waste tank,
which may be caused by some chemicals (foam
build-up will not activate float switches).
FIGURE 16