Adjusting Expiratory Pressure Relief (EPR) in ResMed S8 Elite 2 Posted on August 23, 2009 by Chris Vasta In order to adjust the Expiratory Pressure Relief of the ResMed S8 Elite 2 CPAP machine, your machine must be set up by your clinician to allow you to make the adjustments. Your ResMed S8 Elite 2 has four adjustment levels for your expiratory pressure relief (EPR). OFF (no EPR) 1 (lowest EPR) 2 3 (highest EPR) To adjust your EPR, enter the programming mode on your ResMed S8 Elite 2 CPAP machine. To change the EPR level, select the left slash to the left of the up and down arrows. Press the up arrow or down arrow until you see the setting that you require. The EPR LEVEL screen appears only if your clinician has enabled access to the EPR settings.