Minimum CFM not maintained when MR-VAV-AX goes into un-occupied mode.
As shown on Page 51 of TCON 147, this is part of the design of the VAV.
If you must maintain a minimum CFM.
- Remove any schedules or calculation point extensions that may cause the box to go to unoccupied state.
- Set the Loc Occ (Local Occupancy) to Occupied and disconnect local occupancy sensor
- Set the MCI Occ to on
As stated in TCON 147 page 51. When in any un-occupied Mode, Minimum CFM is not used. The system will toggle between 0 CFM and Cooling High Flow depending on box load. Also note that if Central Plant Heat is not enabled. Then there will be no call for heating when Un-occupied.