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STT40 / STT70
Maintenance 5-8
5.3.2. Replacing Worn Desiccant
• DESICCANT BEDS ARE HOT DURING OPERATION.
To avoid burn hazard, make sure desiccant beds are sufficiently
cool before replacing worn desiccant.
To access the Desiccant Bed:
1. Disconnect electrical power to the dryer.
2. Remove dryer side panels.
3. Remove any internal hoses that may be in the way.
4. Use nut driver to remove clamps at top and bottom of the desiccant tank.
5. Remove the Desiccant Cell leaving valve and Y-pipe attached to the dryer.
6. With a shop vacuum or by dumping, carefully remove all desiccant from each
tower.
Figure 2: Desiccant Bed Location and Disassembly
7. Inspect each lower desiccant screen for tears or holes where desiccant
burned-through. Replace as needed.
8. After cleaning each chamber, add a level layer of half the 8 x 12 bead
desiccant on top of the screen. Next, carefully add the full amount of bead
desiccant specified per bed. Smooth the top level, and finally add another
layer of the remaining bead desiccant to the top. Make sure this layer is level
and smooth. (See following table for correct amount of desiccant required.)
9. Repeat the previous step for the other bed.
10. Inspect the gaskets on the valve assembly. Replace if necessary.
11. Place the desiccant cell assembly back into the dryer and replace clamps.
Remove
Hose Clam
p
s
Remove
Clamp