How to clean a rotor?

Periodically, the rotor may need cleaning from accumulated dust and debris. The rotor should be cleaned by the following methods:

1. If there is dust on the rotor surface, Use a strong vacuum cleaner with a brush to suck up the dust.
2. If there is dust inside the rotor channels. Blow with compressed air through the channels.
3. If there is dirt sticking to the channel walls inside the rotor:
   1. Saturate the rotor by blowing humid air (higher than 60%RH) through the rotor without having any reactivation on. This can be done by just turning the reactivation heater off and still have the process fan and drive motor running if the process air has high humidity. If the process air is too dry, try to put a humidifier in the air stream. Do this for one hour.
   2. Depending on what the dirt is, sink the rotor into water, liquid solvent like xylene if dirt is greasy or into a detergent solution with pH 7 or lower. High pH will destroy the silica gel. Move the rotor up and down for about 15 minutes.
   3. Take the rotor out of the liquid and let it rest with the channels vertically for 5 minutes so the liquid can run out.
   4. Blow down the channels with compressed air to get rid of more liquid.
   5. Put the rotor back in the dehumidifier and run the unit with reactivation on for at least one hour. Note that in the dry air and wet air outlets there will be high concentrations of the liquid for some time. If a solvent has been used there can be a smell from the air streams for many days.
      
      

Note that some dirt, like oil mist or other types of sticky mist, is almost impossible to clean out so the rotor has to be replaced. Also note that by cleaning the rotor some of the initial capacity will come back but usually not all.