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Minimum CFM not maintained when MR-VAV-AX goes into un-occupied mode.

Issue

Minimum CFM not maintained when MR-VAV-AX goes into un-occupied mode.

Environment

I/NET

MR-VAV-AX

Cause

As shown on Page 51 of TCON 147, this is part of the design of the VAV. 

Resolution

If you must maintain a minimum CFM.

  1. Remove any schedules or calculation point extensions that may cause the box to go to unoccupied state.
  2. Set the Loc Occ (Local Occupancy) to Occupied and disconnect local occupancy sensor
  3. 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.

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Last update:
3 weeks ago
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