Thoreson-McCosh Inc
EDITION 05/07/10
23
IB201001.doc
FOR TD-480 THROUGH TD-2000
Read instructions completely before attempting to remove the beds.
1.
Set Off/Auto/On switch to On, Set key switch to “Adjust Setpoints”.
2. Remove side panels.
3.
Follow the procedure in Section 8.2 “Forcing a Bed Index”. When the manifolds have
pulled away from the beds, remove the 4CR (bed shift relay) fro
m its socket. Place a 1”
block inside of the upper and lower air cylinders. (2 if a single piston air cylinder).
Remove the compressed air from the unit and make sure that the bed seals are far
enough away from the beds to be able to slide the beds out of the turret plate. Remove
power from the dryer.
4. Loosen the rotate motor bracket and remove the rotate chain. If the is not enough
adjustment to remove the chain, use the master link to break the chain.
5. Using a HI-LO, place the forks on both sides of the manifold tube over the process
blower. Lift the forks till just touching the beds. (DO NOT LIFT THE BED) Remove the
bolts that hold the band clamps together and remove the bed by backing the HI-LO out
of the unit.
6. Rotate the beds from left to right by hand so the next bed is in the same position as the
first bed removed.
7. Repeat instructions 5 and 6 for the rest of the beds.
Inspect the center cavity at the top of the bed for any quantity of beads, which may indicate
a damaged inner perforate screen.
Inspect the bottom part of the bed for the presence of any loose beads, which may indicate
a damaged outer screen. If when the beds are refilled and there is evidence of bead
leakage, the bed must be repaired or replaced.
To replace the desiccant:
a) Remove the bed bead plate to gain access to the desiccant.
b) Dump the desiccant beads out and vacuum the remaining beads out.
c) Fill the beds with new desiccant - use 4a type 8 x 12 size (0.080" diameter)
desiccant beads only. Fill beds as full as possible. Rock the beds to promote
settling of the beads. Add more desiccants to fill the beds and pack tight without
breaking beads.
d) Apply high temperature sealant (G.E. silicone RTV-106n sealant is recommended)
and secure bed bead plates to beds.
e) Lift the beds into the dryer with bed bead plates up and positioned outward from the
shaft.
f) Reverse the bed removal procedure to replace the beds. Make sure that the bolts for
the band clamps are not strait out from the shaft. (The bolts can catch on frame
parts and stall the rotate mot
or) and the lid clamp pads on the top of the bed don’t
touch the turret plate alignment bushings.
g) Start the dryer and inspect for leaks at the upper and lower bed seals. Force a shift
to check the seals on all beds in all positions.
