TENNEY ENVIRONMENTAL
Tenney Junior Test Chambers: Models TJR and TUJR, W942, or WF4
Page 30
Note: Refer to the Installation Instructions Section for supply and connection type specifications.
A Dry Air Purge System may be provided to purge the chamber of moisture or undesirable process vapors. A
heatless desiccant dryer is operated with a compressed air supply to produce a source of dry air.
General Description:
The dryer is a twin tower heatless desiccant type that is self-
regenerating. Each desiccant tower (chamber) contains a
compression packed molecular sieve. As the compressed air
passes through the sieve, moisture is picked up by the desiccant.
The dried air is released through an outlet port and injected into
the test chamber's conditioning airflow through solenoid valve
ASOL. A small portion of the dried air is passed through a sized
orifice to the other tower to purge the desiccant of moisture
collected during the previous cycle. There are four distinct phases
of the heatless dryer where the compressed air is alternately
cycled and dried in each of the two desiccant towers. Integral
timers and solenoid valves within the dryer control this operation.
Operation:
The system is activated by an Event Output from the main
controller (or by a manual switch). To use the system, the Event
must be turned ON. Reference the Event Label on the side of the
chamber or your Test Report for the Event Number assigned to
this feature. When the system is activated, both the dryer and the
Dry Air solenoid valve ASOL will energize.
Note: Your equipment configuration may be slightly different from what is shown.
13.0 DRY AIR PURGE SYSTEM (Optional)
Heatless Desiccant Dryer
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