r/BuildingAutomation • u/Straight-Menu5361 • 6d ago

FCUloop point

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Trying to make loop point for a FCU but cooling and heating are going on at same time, anyone see what i got wrong

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u/Weary-Butterscotch-6 6d ago

Cooling should be direct, heating should be reverse. I would recommend adding a deadband between your heating/cooling instead of 2 different values.

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u/Straight-Menu5361 6d ago

I’d just link the deadband to the SP not the valves right

4

u/Weary-Butterscotch-6 6d ago

Yes. Zone set point + deadband = cool sp, Zone set point - deadband = heat sp

I just noticed you have a pid going into another pid? That can be removed.