ddctCommunity-rt (ddc-talk Community Module) Greetings, ddc-talk Community! :memo: This module is currently in development and not yet available for use. This topic will be actively maintained and updated as the project progresses. I am thrilled to announce the first addition to our open-sourc…

Hi. For the setpoint reset there should also be an option to reverse the action. Ex. When you use it for temperature control. When the Input raises above the max critical zone it should lower the out because needed to the discharge temperature to maintain the roomtemperature between the critical z…

@fvdb1981 This is a good idea, I’ve created the issue card on YouTrack. Currently I’m working up on finishing the history API. When done i’ll move onto this if someone else hasn’t already. Appreciate the feedback :slight_smile:

Setpoint Reset - i assume there is a time aspect? It increments when above every X seconds? Hysteresis - more of a question than a request. Do you see any value to add functionality to switch 0r invert the output if it is within deadband for an extended period of time. Ive used Tstat blocks to stag…

For the setpoint reset, that’s going to depend. A trim and respond where a setpoint is reset based on something like terminal load, then yes you will have an increment/decrement of X time (usually minutes). If it’s based off return and such? No time step at all. That’ll be just a ratio. Supposedly…

Charles. Thank you for the reply and apologies for not completely understanding. In your reply, “based off return and such”, what are the increment and decrement slot variables doing in this setpoint reset object? Thx

In this example they are doing a static pressure reset based upon the most open VAV. This is reading in pascals vs "WC. This is saying that when the max damper position of a VAV is above 90, it will start to increment the setpoint upward by .50 pascals. If the damper position were to go below 80, it…

I am asking spifically about the setpoint reset object in this post. I am certain there is time aspect. Is that time (specifically in this objective) adjustable or hard coded? Thx

It appears to be an adjustable time. I assume that it’s just not a summary slot but if you were bring this object into the wiresheet and go to its property sheet, it would be there.

@Charles_Johnson is correct in his response. The interval is indeed adjustable, and while I referred to it as a “setpoint reset,” it is more accurately described as a “trim and respond” mechanism. I developed this approach specifically for managing the supply air pressure reset of an Air Handling …

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