OMEGA AIR A-DRY Series, Installation And Operating Manual, Page: 45 / 65

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13.1 Replacement of the molecular sieve
1. Disconnect the adsorption dryer from the compressed air system and the electrical
power.
2. Make certain that the adsorption dryer is depressurised. You can check this by
inspecting the pressure indicators at the top of the adsorption dryer. Picture (13.3)
3. If you are replacing the molecular sieve in the towers only it is necessary to wear
the respiratory protective equipment. We recommend that you use the anti-dust
mask or better.
If you are replacing the whole towers the protection is not needed.
4. It is recommended to replace molecular sieve in one tower and continue with the
other tower after replacing the first tower.
5. Unscrew the nuts on the top of the upper block. Picture (13.4)
6. Unscrew the upper and lower screws at the sides of the blocks beside the tower you
are servicing. Picture (13.5)
7. Slightly lift the upper block and take the tower out.
8. Replace the O-ring seals on the blocks with the O-rings found in the service kit.
Remove the used O-rings and wipe any residual condensate and particles from the
blocks before replacing the O-rings into the grooves.
9. Use pliers to remove the seeger ring (Picture (13.6)) and the nets and remove the
molecular sieve. (Pictures (13.7)) *
10. Fill the tower with the new molecular sieve and replace the nets and the seeger
ring.*
11. Put the tower with replacement molecular sieve back into its position by lifting the
upper block, screw the side screws in.
12. After the molecular sieve in both towers has been replaced, screw the nuts tightly to
ensure the proper sealing.
* Steps 9 and 10 only apply if you are replacing the molecular sieve in the towers.
(13.4)
(13.5)
Tower 1 pressure indicator
Tower 2 pressure indicator
(13.3)