DAP system control and related devices and methods

A method for controlling a DAP system is provided that includes calculating a user seal interface height based on an estimated user height, and based thereon determining an attachment carriage height and a usage carriage height different than the user seal interface height. The method also includes driving powered vertical lifts to raise each carriage to an attachment position at the attachment carriage height while the user is in the DAP system through the top opening including raising about the user the seal frame attached to the carriages and thereby raising the top opening attached to the seal frame, and also controlling the lifts to retain the attachment position during user seal attachment and confirming the attachment. Responsive to confirming, the method includes driving the lifts to move each carriage to a usage position at the usage carriage height and inflating the enclosure to an unweighting.