AEC WD 350 through WD3000 Dehumidifying Dryers - Manual (Page 40)

350-2100 cfm Dryers Chapter 6: Maintenance 39 of 58
• Noticeable amounts of desiccant in the beds is a medium-brown color, or darker.
If any of these signs are noticed, the desiccant in the desiccant beds should be replaced. Desiccant
replacement kits are available from the Parts Department. If you wish, the desiccant beds can be
repacked at your site by a technician.
WARNING
DESICCANT MATERIAL CAUSES EYE IRRITATION
BREATHING MAY BE HARMFUL/MAY CAUSE SKIN IRRITATION
; Do not get in eyes.
; Avoid prolonged contact with skin.
; Use with adequate ventilation.
; Wash thoroughly after handling.
FIRST AID:
In case of eye contact, immediately flush eyes with plenty of water for at least 15 minutes. If
irritation persists, see a physician.
6-8 Desiccant Replacement Procedure
Follow the procedure below to change the desiccant.
1. Disconnect electrical power to the dryer.
2. Remove the bolts and nuts securing the cover of each desiccant tower. Remove the covers with a
lifting fixture.
3. With a shop vacuum, carefully remove all desiccant from each tower.
4. Inspect each lower desiccant screen for tears or burn-through spots. Replace if necessary.
5. After cleaning each tower, add a level layer of half the large bead desiccant on top of the screen.
Next, carefully add the full amount specified "per bed" of small bead desiccant. Smooth the top
level, and finally add another layer of the remaining large bead desiccant to the top. Make sure this
layer is level and smooth.
6. Repeat the above step for the other bed.
7. Inspect the gasketing on each of the covers. Replace if necessary.
8. Re-install the covers.