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EMS script for Fan Coil Units

asked 2018-12-06 12:58:36 -0500

EnergyModeler's avatar

updated 2018-12-06 20:22:10 -0500


I am new to EMS (through Design Builder) and I am trying to make a script that keeps the fan coil supply fan on during occupied periods (6AM to 9PM) for all zones in my building. The availability is already set to 247 in the building so it wouldn't be the availability variable that I would need to use.

I am having trouble finding the correct variable to use to keep the fan coil supply fans on. I've attached my script below. Thank you.


, InsideHVACSystemIterationLoop, ;



! add program code

IF CurrentTime >= 6 && CurrentTime <=18


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answered 2018-12-06 16:14:55 -0500

You do not have to create an EMS routine. You can create a new fractional schedule that has a value of 1 from 6 AM to 9 PM and 0 for the rest of the day (9 PM to 6 AM). Then you can assign the schedule you just created to the fan as the Availability Schedule. This means that the fan will only be allowed to run from 6 AM to 9 PM (which is what you want) and it will be forced to be off for the rest of the day (9 PM to 6 AM).

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Right. I should be more clear. The fan coil supply power dips in some zones during occupied times (all the way to zero watts). I am trying to write an EMS script that will force the fan coil supply power to be 100% during occupied hours regardless if the load is met or not. One way to solve this is have the flow rate to be a minimum of 1 CFM during occupied hours but I am also not sure how to write a script for that.

EnergyModeler's avatar EnergyModeler  ( 2018-12-07 06:34:59 -0500 )edit

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Asked: 2018-12-06 12:58:36 -0500

Seen: 170 times

Last updated: Dec 06 '18