Change System Mode on CCU Mully Mulheran July 05, 2019 14:31 Updated Follow 1. Select 'System' in the upper-left. 2. Select either 'Off', 'Auto', 'Cool Only', or 'Heat Only'. Related articles Installer Options Passwords on CCU Changing Schedule on the CCU Connect Tablet to Control Mote (Seating the CCU) Central Control Unit (CCU) Installation Comments 0 comments Please sign in to leave a comment.