I have found the English manual and useful info I thought in sharing.

So find attached manual , though I’m not exactly sure of Models for other than D units so check your one against this . 

Also my reading of the maintenance is that by 2-3 month we should be at least cleaning the filters in the main unit , and replacing them in month , though an indicator should pop in the control if they need either clean or replacing (I guess mainly replacing ) saying “fil + ter” blinking alternatively.

Tim : could you let us know when and how much and how are we getting those filters ? 

Have a great week everyone and good hard yaka! Today !