10
Pub. No. OM-A-10H REV. 7 — June 2006
At time equal to 5.1 minutes,
the left tower purge
valve opens to commence the regeneration cycle and the
above process is then repeated on the opposite towers.
NOTE:
During the regeneration air flow through the
desiccant bed, the tower pressure gauge should read 0
PSIG. Any higher pressure is an indication of a plugged
muffler, which will retard the regeneration of desiccant.
Shutdown Procedure
Heatless type dryers operate on a standard timer cycle of
10 minutes, 5 minutes drying and 5 minutes regenerating.
This cycle should not be interrupted (except for servicing).
If the dryer needs to be shut down for a certain shift or
weekend, it should be turned off at the end of the 5 minute
regenerating cycle with both towers at line pressure. If
servicing is required, advance the time sequence so the
purge valves close and both towers pressurize. At this time
the dryer can be turned off.
For normal dryer shutdown, wait until both towers are at
line pressure. At this time the purge valves will close.
1. If the compressed air system has been
piped with a bypass around the dryer then
the following should be completed:
a. Open the bypass valve to allow process flow to
continue downstream. Then close the outlet
isolation valve on the dryer bypass piping.
b. Turn the power switch to the OFF position.
c. Close the inlet isolation valve on the dryer bypass
piping. At this time the dryer is isolated and can
be depressurized, for servicing.
2. If the compressed air system has not been
piped with a bypass then the following
should be completed:
a. Turn the power switch to the OFF position.
b. The tower switching valves are normally open
valves; therefore, with the power OFF the inlet
valves to the towers will be open, and the purge
valves will close. This will give you extended
drying time until desiccant chambers are
saturated.
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