Assortment / System Description

Room pressurization and fume hood control
Fume hood
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The fume hood minimum and maximum airflow provided signals are collected
by the room.
Variables distributed from room:
● Occupancy
● Fume hood exhaust air flow request from room
The exhaust airflow request from the room will only change the exhaust airflow
setpoint when the exhaust setpoint selection is set to auto.
When the occupied exhaust airflow setpoint is higher than minimum, the
exhaust airflow request from the room will be evaluated against the maximum
airflow setpoint.
When the occupied exhaust airflow setpoint is equal to minimum setpoint, the
exhaust airflow request from the room will be evaluated against minimum
airflow setpoint.
When the unoccupied exhaust airflow setpoint is higher than minimum setpoint,
the room exhaust airflow request from the room will be evaluated against the
max airflow setpoint. If the exhaust request is higher than the unoccupied
exhaust airflow setpoint, the exhaust airflow setpoint will be set equal to the
exhaust request.
When the unoccupied exhaust setpoint is less than or equal to minimum
setpoint, the exhaust airflow request from the room will be evaluated against
the minimum airflow setpoint. If the exhaust request is higher than minimum
airflow setpoint and higher than the unoccupied exhaust airflow setpoint, the
exhaust airflow setpoint will be set equal to the exhaust request.
Interface Description Type Ref. Owned by
FhVFace Fume hood face velocity AI
●
Room
segment /
Field device
FhSpAirFlEh Fume hood exhaust air volume flow
setpoint
APrcVal
● -
FhSpAirFlRelEh Fume hood exhaust setpoint for relative
air volume flow
ACalcVal
● -
FhVFaceEff Fume hood effective face velocity ACalcVal
● -
FhAirFlReqEh Fume hood exhaust air volume flow
request from room
ACalcVal
● -
FhAflMinEffEh Fume hood exhaust effective minimum air
volume flow
ACalcVal
● -
FhAflMaxPvdEh Fume hood maximum provided air volume
flow for exhaust
ACalcVal
● -
FhAflMinPvdEh Fume hood minimum provided air volume
flow for exhaust
ACalcVal
● -
FhSpVFace Fume hood face velocity setpoint ACalcVal
● -
FhSpAirFlManEh Fume hood exhaust manual air volume
flow setpoint
ACnfVal
● -
FhUcdSpVFace Fume hood unoccupied face velocity
setpoint
ACnfVal
● -
FhOcdSpVFace Fume hood occupied face velocity
setpoint
ACnfVal
● -
Exhaust setpoint
determination