Parker Zander WVM 1080, Operating Manual

Page: 17 / 56

EN | Operating manual Technical product description
WVM 40 -1450 17
Cooling phase (duration: approx. one hour)
The hot, dried desiccant must now be cooled
and is then ready for absorption. The heater is
switched off so that the vacuum pump feeds
cold ambient air through the vessel.
If the “loop regeneration” option has been
installed, the regeneration air fl ows in a closed
circuit. Heat dissipation occurs via a water
cooled heat exchanger.
Advantage: No desiccant preloading with
ambient moisture.
Cooling phase
Pressure build-up phase (duration: several minutes)
After completion of the cooling phase, the
pressure in the vessel is raised to operating
pressure via the pressure build-up line.The
vessel can now be switched from regeneration
to absorption operation.
Pressure build-up
Stand-by-phase (for dewpoint measurement
option)
The regenerated vessel remains in the stand-
by phase as long as the pressure dewpoint is
better than the set switch over value. Switch
over only occurs when the switch over value is
reached or after a maximum cycle duration of
48 hours.
Switching over
In the fi xed cycle
A switch-over between the vessels occurs after 6 hours. After switching over, the process
described above is repeated whereby adsorption and regeneration is performed in the other
vessel respectively.
In the variable cycle
The pressure dewpoint-dependent controller lets you operate the dryer in the fi xed or varia-
ble cycle.
In the variable cycle, switchover occurs in dependence of the measured pressure dewpoint.