Air Terminal Unit Operations Report
Overview
This report scores VAV boxes based on their availability to maintain zone temperature and airflow setpoints, along with potential root causes.
Intent of Report
This report intends to focus on how well OR mechanical systems are meeting design requirements with regard to temperature, humidity, pressure, airflow, and ventilation. The report provides a RootCause analysis based on different KPIs and rule outputs to help direct technicians to possible issues within the equipment.
Requirements
The VAV equipment type must include one of the following input points to appear on the report.
- EffCoolSp, EffHeatSp or ZoneTempDev
Primary Metrics
Key metrics in evaluating the operation of the equipment within the report.
- ZoneTemp is less than or greater than ZoneTempSp
- DaFlow is less than or greater than DaFlowSp
- DmprCmd is less than 1% open or greater than 90% open
- Reheat is greater than 5% open
Scored KPIs
- Zone Temperature vs. Zone Temperature setpoint (60% of ROS)
- VAV Box Airflow vs Airflow setpoint (40% of ROS)
Input Points
To appear in a report, each piece of equipment of the appropriate type and with the appropriate equipment tag constraints must have at least one input point. There are two general categories of input points.
Standard Input Points
A standard input point is typically a proxy point with time-series data that is retrieved at regular intervals from a remote data source such as Niagara using a Resolute Connector. Below are the Standard Input Points for the Air Terminal Unit Operations Report.
| Point Template | Positional Requirements | Optionality |
|---|---|---|
| ZoneTemp | The point must be a direct child of the equipment | Mandatory |
| ColdDeckDmprCmd | The point must be a direct child of the equipment | Optional |
| DaFanSts | The point must be a direct child of the parent AHU of the equipment | Optional |
| DaFlow | The point must be a direct child of the equipment | Optional |
| DaFlowSp | The point must be a direct child of the equipment | Optional |
| DaTemp | The point must be a direct child of the equipment | Optional |
| DmprPos | The point must be a direct child of the equipment | Optional |
| EffCoolSp | The point must be a direct child of the equipment | Optional if EffHeatSp or ZoneTempDev is available |
| EffHeatSp | The point must be a direct child of the equipment | Optional if EffCoolSp or ZoneTempDev is available |
| HotDeckDmprCmd | The point must be a direct child of the parent AHU equipment | Optional |
| RhtCmd | The point must be a direct child of the equipment | Optional |
| ZoneTempDev | The point must be a direct child of the equipment | Optional if EffCoolSp or EffHeatSp is available |
| ZoneTempSp | The point must be a direct child of the equipment | Optional |
Rule Input Points
A rule input point is the output of a rule applied to a given piece of equipment. It is a time series representing the presence or absence of a given fault condition. Below are the Rule Input Points for the Air Terminal Unit Operations Report.
| Rule Name | Optionality |
|---|---|
| 3.2.33.1 - Zone Temperature Is Less Than Setpoint | Mandatory |
| 3.2.34.1 - Zone Temperature Is Greater Than Setpoint | Mandatory |
| 3.1.16.1 - Discharge Fan Static Pressure Is Greater Than Setpoint | Optional |
| 3.1.17.1 - Discharge Fan Static Pressure Is Less Than Setpoint | Optional |
| 3.1.20.1 - Fan Status Off When Commanded On | Optional |
| 3.1.21.1 - Fan Status On When Commanded Off | Optional |
| 3.1.33.1 - Discharge Air Temperature Is Greater Than Setpoint | Optional |
| 3.1.34.1 - Discharge Air Temperature Is Less Than Setpoint | Optional |
| 3.2.5.1 - Unexpected Increase in VAV Discharge Temperature | Optional |
| 3.2.6.1 - Cooling Mode with No Flow | Optional |
| 3.2.7.1 - Cooling Mode with Low Flow | Optional |
| 3.2.9.1 - VAV Zone Temperature Sensor Failure | Optional |
| 3.2.9.2 - VAV Discharge Air Temperature Sensor Failure | Optional |
| 3.2.16.1 - Occupied Zone Temperature Heating Setpoint Above High Limit | Optional |
| 3.2.17.1 - Occupied Zone Temperature Cooling Setpoint Below Low Limit | Optional |
| 3.2.18.1 - VAV Discharge Airflow Sensor Failure | Optional |
| 3.2.23.1 - Leaking Damper | Optional |
| 3.2.24.1 - Low Discharge Air Temperature | Optional |
| 3.2.25.1 - Leaking Reheat Valve | Optional |
| 3.2.31.1 - Multi Zone Unexpected Temperature Decrease When Cold Deck Damper Is Closed | Optional |
| 3.2.32.1 - Multi Zone Unexpected Temperature Increase When Hot Deck Damper Is Closed | Optional |
| 3.2.37.1 - Zone Temperature Heating Setpoint Is Higher Than Cooling Setpoint | Optional |
| 3.2.38.1 - Minimum Airflow Setpoint Is Greater Than The Maximum Airflow Setpoint | Optional |
Sample Report
