Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
Not sure if this does exactly what you want, but my first thought is to go to the "Control" tab for the air loop and set "Use Night Cycle" to "Cycle on Full System if Heating or Cooling Required". Then instead of using "Always On Discrete" as shown on my screenshot below, create a schedule that you want for your operation (9 to 18).
Then enable demand controlled ventilation (so you don't over ventilate at night) and also turn on the economizer, so you do bring in outdoor air when beneficial for heating or cooling.
