Sterlco SDAP 90-225 CFM Series Drying and Conveying Systems - Manual (Page 54)

Page 54 SDAP Series PD 2 to PD 4 Drying and Conveying Systems
6-5 Replacing Worn Desiccant
Caution!
Make sure desiccant beds are sufficiently cool
before replacing worn desiccant.
1. Disconnect the electrical and compressed air supply.
2. Remove the rear and side shrouds to expose the desiccant beds.
3. Free the bed covers by removing the hex nuts on the retaining rods and remove the upper
screens from both beds.
4. Remove the desiccant in one of the following ways:
• Vacuum out the desiccant.
• Remove the entire bed from the frame and dump it out. To do this, remove the hose
connections, unclamp the beds, and unbolt from the regen heater assembly.
Make sure the bed interiors are clean.
Important!
You should properly dispose of any discarded desiccant.
Consult local disposal regulations for more information.
Before re-packing the beds, determine the proper amount of desiccant for the dryer being
serviced. See Figure 14 on the following page for more information. Pre-measured
desiccant kits are available from the Sterling Parts Department at AEC, Inc.
Attach the beds to the frame for Steps 6 through 9.
6. Carefully place half of the large bead in the bottom of the beds, in an even layer, on the
bottom screen. Place the small bead on top of it, in an even layer.
Carefully place an even layer of the remaining large beads over the small beads.
7. Install the top screen, making sure that the edge is in contact with the sides of the bed all
the way around. Install the washers and nuts and tighten down.
Gently tap the around the sides of the desiccant canister with a rubber mallet to settle the
desiccant. As settling occurs, re-tighten the nuts.
Repeat the tapping and tightening process until little additional settling occurs.
8. Install the covers and gaskets on the beds, making sure they are tight and sealed. Replace
desiccant bed gasket if necessary.
9. Re-connect any hoses that were disconnected.
10. Re-install the rear and side shrouds. Re-connect the compressed air supply and electrical
power.