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STT40 / STT70
Maintenance 5-7
5.3. Corrective Maintenance
This section provides you with the information necessary to correct or repair any issues which
might appear during the normal operation of your dehumidifying dryer. Although we have listed
how to perform these procedures, it is recommended that you call the Service Department to
have any in-depth maintenance performed.
5.3.1. Symptoms of Worn Desiccant
The moisture absorption capacity of the desiccant used in your dehumidifying dryer degrades
after an indefinite period of time. Useful life depends on variables such as material moisture
content, plasticizer vapors in the return air, and number of regeneration cycles.
Your dryer may need new desiccant if it exhibits any of the following symptoms:
• The process air dew point measured with a portable dew point monitor is higher than
-10°F (-23ºC) throughout the process drying cycle.
• Noticeable amounts of desiccant in the beds is a medium-brown color or darker.
If you notice any of these signs, replace the desiccant in the desiccant beds. Desiccant
replacement kits are available from the Parts Department. If you want, a technician can repack
desiccant beds at your site.
• Handling desiccant material is HAZARDOUS.
Wear an N-100 type safety filter mask or equivalent to avoid
prolonged breathing of desiccant dust. Wear safety goggles
and gloves to avoid contact with eyes and skin.
• Handle with adequate ventilation.
• Wash hands thoroughly after handling.
✚ FIRST AID ✚
In case of eye contact, immediately flush eyes
with plenty of water for at least 15 minutes.
SEE A PHYSICIAN IMMEDIATELY IF IRRITATION PERSISTS.