For systems over 10,000 CFM, we have to add an optimum start schedule to the system. We're going to quickly show you how to do that.
We start by looking at a system, and we want to find the fan schedule. We notice this is SYS1, PVAPS, and we'll assume that all of these systems are going to have the optimum start schedule. This particular system has two individual day type fan schedules. We'll probably simplify this to one day. You'll see what we mean in a minute.
We start by looking at day one. Here we can see the schedule is zero for the nighttime hours, and the schedule is on from 7 to 8 p.m. Optimum start allows the fan to operate if it needs to. This helps with on-net hours and helps the building ramp up, if you will. To allow the fan to operate if needed, we change this value here to minus 999 and we typically allow for two hours. Instead of the fan being on or off, it's left at an unknown value, and eQUEST gets to decide if the fan is needed. This allows two hours of optimum start. We can sometimes make this three, but usually, two is enough. If you are having some on-net hours, you can try to switch this to the third hour, which would be at 4 to 5 a.m.
We did this for day type one. If we look at the second day type, the fans are off all day. For this one, we would not need to add optimum start because this is for the weekend, and it's not running at all. If we look at the week schedule for the fans, we can see that day one is for the weekdays and day two, since this is an office, the fans are off. We would not add optimum start to those days. The heating design day and the cooling design day should, of course, be the occupied day.
I'm going to make this really simple for you and create this schedule so that you can import it into your other models, and we'll do that moving forward. Attached to this video, you should see an optimum start.inp file that you can download, and when we move forward, we will import that in other videos.