Disable (turning off) of the validation is not a right strategy.
The right paradigm when you use RichFaces is limiting of the processing for the components that should be processed and bypass processing for the rest components.
Read the doc and see the examples how to do so. For example,
http://livedemo.exadel.com/richfaces-demo/richfaces/ajaxAttributes.jsf?c=ajaxattributes (Data Processing Options)