Call us for help before you try this—seriously.
This is most frequently used for things like stairwell pressurization fans--- where you don’t want too much pressure that would keep the stairwell doors from opening, but enough pressure to keep the fresh air flowing into the stairwell so people can evacuate. You want the VFD to ignore all the internal alarms and keep the air flowing as long as possible.
Set this point to  “trip at all alarms-test” during setup and testing, this will keep you from damaging the VFD or motor during testing
Change to  “trip and reset at critical alarms” ONLY when you are ready to arm the system for tenants
Set to  “fire mode”, a contact closure on this input puts the vfd into fire mode
Set to  “Enabled”
Set this to the value that you want the fan to run—usually the balancer will tell you this value based on pressure measurements from the stairwell
Here is an excerpt from the Programming Guide that describes fire-mode: LINK