- Attributes (static)
- AHU
- Building
- Geo Coordinates
- Area Served (ft2)
- Max Occupants (count)
- Room
- Points
- AHU Supply Air Temp (C/F) AHU.SA.TEMP
- AHU Supply Fan (0/1) AHU.SF.SPEED
- Airflow (cfm) AIRFLOW
- Airflow percent (%) Air.Flow.PERCENT
- Airflow Setpoint (cfm) AIRFLOW.SP
- Airflow Heating Setpoint (C/F) AIRFLOW.Htg.SP
- Damper Command (%) ZN.DAMPER.COMMAND
- Discharge Temp (F) ZN.DISCHARGE.TEMP
- Zone Damper Position (%) ZN.DAMPER.POS
- Occupancy (count or Y/N) ZN.OCC
- Reheat (%) REHEAT.VALVE
- Reheat Value Leak
- Zone Temp (F/C) ZN.TEMP
- Zone Temp Set Point (F/C) Zn.Htg.SP Zn.Clg.SP
OPTIONAL
- zone air humidity
- zone air co2
- zone air temp occupied cooling setpoint
- zone air temp occupied heating setpoint
- zone air temp unoccupied cooling setpoint
- zone air temp unoccupied heating setpoint
- zone air temp standby cooling setpoint
- zone air temp standby heating setpoint
- discharge air fan cmd
- discharge air fan
Unaccounted :
- AHU.SF.SPEED
Fault Detection
Asset
Priority
Category
Name
Formula Description
Formula
VAV
1
Energy
Zone Setpoint Outside of Limits
Setpoints should never exceed campus standards for maximum and
minimum
Are Htg and Clg two diff setpoints?
(ZN.Htg.SP > Campus.Htg.Max.Limit) OR
(ZN.Htg.SP < Campus.Htg.Min.Limit) OR
(ZN.Clg.SP > Campus.Clg.Max.Limit) OR
(ZN.Clg.SP < Campus.Clg.Min.Limit)
VAV
1
Comfort
Zone Humidity Outside of Comfort Limits
Are Humidity Sensors Available?
VAV
1
Maintenance
High Zone CO2 Levels
Are CO2 level Sensors Available?
VAV
1
Energy
Low Zone Temperature
Should this use AHU.SF.SPEED or .STATUS? Either is fine. In UC BMS, they are tied together
[If (AHU.SF.SPEED > 0) and ZN.OCC = 1 and (ZN.Htg.SP - ZN.Temp ) > 4 ] for 30 minutes
VAV
1
Energy
High Zone Temperature
When associated AHU is running and zone is occupied and zone temp is higher than the zone temp cooling setpoint by 4(or 2) degrees or more
[If (AHU.SF.SPEED > 0) and ZN.OCC = 1 and (ZN.TEMP- ZN.Clg.SP ) > 4 ] for 30 minutes
VAV
1
Energy
Damper
Stuck Closed
When associated AHU is running and zone is occupied and zone temp is higher than the zone temp cooling setpoint by 4(or 2) degrees or more and zone damper command is almost fully open
[If (AHU.SF.SPEED > 0) and ZN.OCC = 1 and (ZN.TEMP- ZN.CLG.SP ) > 4 ] and (ZN.DAMPER.COMMAND > 95%) and ABS(ZN.DISCHARGE.TEMP - ZN.CLG.SP < 2 ) for 30 minutes
VAV
1
Energy
Damper
Stuck Open
When associated AHU is running and zone is occupied and zone temp is lower than the zone temp heating setpoint by 4(or 2) degrees or more and zone damper command is almost fully closed
[If (AHU.SF.SPEED > 0) and ZN.OCC = 1 and (ZN.HTG.SP - ZN.TEMP ) > 4 ] and ABS(ZN.Airflow - ZN.HTG.AirFlow) < DEADABND] for 30 minutes
Future: Pass on Low Duct Static Pressure Fault from AHU template to VAV template.
VAV
2
Energy
High Flow
Need help for this
VAV
2
Energy
Low Flow
Need help for this
VAV
2
Maintenance
Insufficient Flow Capacity
When associated AHU is running and zone is occupied and zone temp is higher than the zone temp cooling setpoint by 4(or 2) degrees or more and zone damper command is almost fully open
[If (AHU.SF.SPEED > 0) and ZN.OCC = 1 and (ZN.TEMP- ZN.CLG.SP ) > 4 ] and (ZN.DAMPER.COMMAND > 95%)] for 30 minutes
OR
If (Tag.Avg (ZN.DAMPER.COMMAND) > 90% for 1 week then Insufficient Flow Capacity Error. Use Analysis Tag for conditional average.
OR
If (Zone with Max Damper Position is constant for 80% of the time during a week) then mark zone as driving zone
VAV
2
Maintenance
Insufficient Heating Capacity
When AHU is running and HHW Supply temp is as per design and room is calling for heating and Zone temp sensor is not broken and Zone Temperature is lower than Zone Heating Setpoint by 4 deg.
[If (AHU.SF.SPEED > 0 ) and (REHEAT.VALVE > 95% ) and (ZN.TEMP< ZN.Htg.SP- 4)] for 30 minutes
VAV
2
Maintenance
Exhaust Low Flow
Need help for this
VAV
2
Maintenance
Exhaust High Flow
Need help for this
VAV
2
Maintenance
No Flow Response
Need help for this
VAV
5
Maintenance
Dual Duct Cold Deck Low Flow
VAV
5
Maintenance
Dual Duct Cold Deck High Flow
VAV
5
Maintenance
Dual Duct Cold Deck Insufficient Flow Capacity
VAV
5
Maintenance
Dual Duct Cold Deck No Flow Response
VAV
5
Maintenance
Dual Duct Hot Deck Low Flow
VAV
5
Maintenance
Dual Duct Hot Deck High Flow
VAV
5
Maintenance
Dual Duct Hot Duct Insufficient Flow Capacity
VAV
5
Maintenance
Dual Duct Hot Duct No Flow Response
VAV1EnergyReheat Damper Open when Air flow is not at minimumWhen AHU is running and room is calling for heating and airflow is higher than airflow heating setpoint[If (AHU.SF.SPEED > 0 ) and (REHEAT.VALVE > 2%) and (AIRFLOW> AIRFLOW.Htg.SP*110%) ] for 30 minutes then flag eventVAV1EnergyReheat Valve LeakingWhen AHU is running and Reheat Valve is almost closed and there is significant rise in Zone Discharge Air Temp as compared to AHU Supply Air Temp[If (AHU.SF.SPEED > 0 ) and (REHEAT.VALVE < 2%) and ( ZN.DSICHARGE.TEMP> AHU.SA.TEMP+ 4) ] for 30 min then flag eventVAV1EnergyCFM per SQFT servedCalculating CFM/SQ.FTIf (Airflow>0) then Airflow/AreaServed else NoOutput()VAV1EnergyZone Airflow Setpoint Minumum set HighOver Ventilation of a room as per ASHRAE recommendations when not thermally drivenIf (ZN.OCC = 1 AND Airflow/AreaServed >1 AND Airflow = Airflow.Stpt.Min +- Error) for 15 minutes then mark airflow setpoint minimum is higher than it needs to be.