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In the OS:Controller:OutdoorAir object of the outside air (DOAS) loop, check the 'Minimum Fraction of Outdoor Air Schedule Name' and 'Maximum Fraction of Outdoor Air Schedule Name'. Make sure they are not following any schedule.

Some other miscellaneous DOAS tips

• At the terminal unit level, set the 'control for outdoor' to 'Yes'
• The top of your DOAS air loop should have 3 tabs. 'Layout', 'Control' and 'Grid'. Go to the 'Control' tab and make sure all the schedules are correctly assigned