3.4 Unit Ventilator
3.4.1.1 - Unit Ventilator Simultaneous Heating and Cooling
Summary
The Unit Ventilator is heating and cooling at the same time, which wastes energy.
| Equipment Type | Equipment Tag Constraints | Tuple Constraints |
|---|---|---|
| uv | -- | -- |
Input Points
| Name | Point Template | Positional Requirements | Optionality | Multiplicity |
|---|---|---|---|---|
| Cooling Command | ClgCmd | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Heating Command | HtgCmd | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| DA Fan Status (single or common) | DaFanSts | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
Input Constants
| Name | Data Type | Default Value | Description |
|---|---|---|---|
| Delay (minutes) | Numeric | 0 | The delay represents a span of time in minutes during which the vav must be in a fault state before the rule starts to actually report that is is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time. |
| Cooling Command | Numeric | 0 | The cooling command threshold. |
| Heating Command | Numeric | 0 | The heating command threshold. |
3.4.2.1 - Outside Air Flow Damper Position is Greater Than Minimum Setpoint During Heating Mode
Summary
Excess outside air is being brought into the building. The outside air damper is opened greater than the minimum position setpoint during heating mode, except when CO2 levels are higher than CO2 level setpoint when CO2 sensor exists.
| Equipment Type | Equipment Tag Constraints | Tuple Constraints |
|---|---|---|
| uv | -- | -- |
Input Points
| Name | Point Template | Positional Requirements | Optionality | Multiplicity |
|---|---|---|---|---|
| Outside Air Damper Command (open/closed) | OaDmprCmd | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| DA Fan Status (single or common) | DaFanSts | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Cooling Command | ClgCmd | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Heating Command | HtgCmd | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Outside Air Damper Minimum Position Setpoint | OaDmprMinPosSp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Zone CO2 | ZoneCO2 | This point must be a direct child of the equipment that the rule is attached to. | Optional | Scalar |
| Zone CO2 Setpoint | ZoneCO2Sp | This point must be a direct child of the equipment that the rule is attached to. | Optional | Scalar |
Input Constants
| Name | Data Type | Default Value | Description |
|---|---|---|---|
| Delay (minutes) | Numeric | 15 | The delay represents a span of time in minutes during which the vav must be in a fault state before the rule starts to actually report that is is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time. |
| Cooling Command | Numeric | 0 | The cooling command threshold. |
| Heating Command | Numeric | 0 | The heating command threshold. |
| Outside Air Damper Position Error | Numeric | 0 | The outside air damper position error threshold. |
| CO2 Error | Numeric | 10 | The carbon dioxide error threshold. |
3.4.3.1 - Outside Air Damper Position is Greater Than Minimum Setpoint During Mechanical Cooling Mode
Summary
Excess outside air is being brought into the building. The Outside Air Damper is greater than the minimum position setpoint during mechanical cooling mode, except when CO2 levels are higher than Co2 level setpoint when Co2 sensor exists or outside air temperatures are lower than the economizer outside air temperature setpoint.
| Equipment Type | Equipment Tag Constraints | Tuple Constraints |
|---|---|---|
| uv | -- | -- |
Input Points
| Name | Point Template | Positional Requirements | Optionality | Multiplicity |
|---|---|---|---|---|
| DA Fan Status (single or common) | DaFanSts | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Outside Air Damper Command (open/closed) | OaDmprCmd | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Outside Air Damper Minimum Position Setpoint | OaDmprMinPosSp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Cooling Command | ClgCmd | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Heating Command | HtgCmd | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Outside Air Temp | OaTemp | This point must be a descendant of on_prem_weather_station of this rules equipment ancestor. | Optional | Scalar |
| Outside Air Temp On Prem Weather Station | OaTempOnPremWS | This point must be a direct child of an off_prem_weather_station attached to this rules equipment ancestor. | Optional | Scalar |
| Outside Air Temperature | OaTempOffPremWS | This point must be a direct child of the equipment that the rule is attached to. | Optional | Scalar |
| Zone CO2 | ZoneCO2 | This point must be a direct child of the equipment that the rule is attached to. | Optional | Scalar |
| Zone CO2 Setpoint | ZoneCO2SP | This point must be a direct child of the equipment that the rule is attached to. | Optional | Scalar |
Input Constants
| Name | Data Type | Default Value | Description |
|---|---|---|---|
| Delay (minutes) | Numeric | 15 | The delay represents a span of time in minutes during which the vav must be in a fault state before the rule starts to actually report that is is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time. |
| Cooling Command | Numeric | 0 | The cooling command limit. |
| Heating Command | Numeric | 0 | The heating command limit. |
| Economizer Outside Air Temperature | Numeric | 70 | The economizer outside air temperature setpoint |
| Outside Air Damper Position Error | Numeric | 0 | The outside air damper position error threshold. |
| CO2 Error | Numeric | 10 | The carbon dioxide error threshold. |
3.4.4.1 - Outside Air Damper is Less Than the Minimum Position Setpoint
Summary
The outside air damper is less than the minimum position setpoint and sufficient ventilation may not be provided.
| Equipment Type | Equipment Tag Constraints | Tuple Constraints |
|---|---|---|
| uv | -- | -- |
Input Points
| Name | Point Template | Positional Requirements | Optionality | Multiplicity |
|---|---|---|---|---|
| Outside Air Damper Command (open/closed) | OaDmprCmd | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| DA Fan Status (single or common) | DaFanSts | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Outside Air Damper Minimum Position Setpoint | OaDmprMinPosSp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Mixed Air Temp | MaTemp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
Input Constants
| Name | Data Type | Default Value | Description |
|---|---|---|---|
| Delay (minutes) | Numeric | 60 | The delay represents a span of time in minutes during which the vav must be in a fault state before the rule starts to actually report that is is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time. |
| Low Limit | Numeric | 40 | The mixed air temperature low limit setpoint. |
3.4.5.1 - Operating Outside of Schedule
Summary
The Unit Ventilator (UV) is operating outside the defined Occupied Schedule and zone temperature is in-between unoccupied heat and cool setpoints.
| Equipment Type | Equipment Tag Constraints | Tuple Constraints |
|---|---|---|
| uv | -- | -- |
Input Points
| Name | Point Template | Positional Requirements | Optionality | Multiplicity |
|---|---|---|---|---|
| Zone Temperature | ZoneTemp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| DA Fan Status (single or common) | DaFanSts | This point must be a direct child of the equipment that the rule is attached to. | Optional | Scalar |
| Unoccupied Cooling Setpoint | UnoccCoolSp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Unoccupied Heating Setpoint | UnoccHeatSp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Occupied Mode | Occ | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Da Fan Command (single or common) | DaFanCmd | This point must be a direct child of the equipment that the rule is attached to. | Optional | Scalar |
Input Constants
| Name | Data Type | Default Value | Description |
|---|---|---|---|
| Delay (minutes) | Numeric | 15 | The delay represents a span of time in minutes during which the vav must be in a fault state before the rule starts to actually report that is is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time. |
3.4.6.1 - Discharge Air Temperature Sensor Failure
Summary
The temperature sensor point does not change by more than a tolerance of (0.01) or is outside the range (-40 to 250ºF)
| Equipment Type | Equipment Tag Constraints | Tuple Constraints |
|---|---|---|
| uv | -- | -- |
Input Points
| Name | Point Templates | Positional Requirements | Optionality | Multiplicity |
|---|---|---|---|---|
| Discharge Air Temperature | DaTemp | This point must be direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
Input Constants
| Name | Data Type | Default Value | Description |
|---|---|---|---|
| Delay (minutes) | Numeric | 120 | The delay represents a span of time in minutes during which the vav must be in a fault state before the rule starts to actually report that is is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time. |
| Maximum Value | Numeric | 250 | The high threshold |
| Minimum Value | Numeric | -40 | The low threshold |
| Variance | Numeric | 0.01 | The variance threshold. |
3.4.7.1 - Zone Temperature Sensor Failure
Summary
The zone temperature sensor has failed. The temperature sensor is invariant or is outside the expected range.
| Equipment Type | Equipment Tag Constraints | Tuple Constraints |
|---|---|---|
| uv | -- | -- |
Input Points
| Name | Point Templates | Positional Requirements | Optionality | Multiplicity |
|---|---|---|---|---|
| Zone Temperature | ZoneTemp | This point must be direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
Input Constants
| Name | Data Type | Default Value | Description |
|---|---|---|---|
| Delay (minutes) | Numeric | 120 | The delay represents a span of time in minutes during which the vav must be in a fault state before the rule starts to actually report that is is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time. |
| Maximum Value | Numeric | 150 | The high threshold |
| Minimum Value | Numeric | 30 | The low threshold |
| Variance | Numeric | 0.01 | The variance threshold. |
3.4.8.1 - Outside Damper Open When Unit is Off
Summary
The Outside Air Damper is open and the supply fan is off, allowing air infiltration. The damper should be shut when the unit is off.
| Equipment Type | Equipment Tag Constraints | Tuple Constraints |
|---|---|---|
| uv | -- | -- |
Input Points
| Name | Point Templates | Positional Requirements | Optionality | Multiplicity |
|---|---|---|---|---|
| DA Fan Status (single or common) | DaFanSts | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Outside Air Damper Position | OaDmprPos | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
Input Constants
| Name | Data Type | Default Value | Description |
|---|---|---|---|
| Delay (minutes) | Numeric | 120 | The delay represents a span of time in minutes during which the vav must be in a fault state before the rule starts to actually report that is is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time. |
3.4.9.1 - Fan Status Off When Commanded On
Summary
The fan status os "Off" but the fan is commanded "On".
| Equipment Type | Equipment Tag Constraints | Tuple Constraints |
|---|---|---|
| uv | -- | -- |
Input Points
| Name | Point Templates | Positional Requirements | Optionality | Multiplicity |
|---|---|---|---|---|
| DA Fan Status (single or common) | DaFanSts | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| DA Fan Command (single or common) | DaFanCmd | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
Input Constants
| Name | Data Type | Default Value | Description |
|---|---|---|---|
| Delay (minutes) | Numeric | 15 | The delay represents a span of time in minutes during which the vav must be in a fault state before the rule starts to actually report that is is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time. |
3.4.10.1 - Fan Status On When Commanded Off
Summary
The fan status is "on" but is commanded "off".
| Equipment Type | Equipment Tag Constraints | Tuple Constraints |
|---|---|---|
| uv | -- | -- |
Input Points
| Name | Point Templates | Positional Requirements | Optionality | Multiplicity |
|---|---|---|---|---|
| DA Fan Status (single or common) | DaFanSts | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| DA Fan Command (single or common) | DaFanCmd | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
Input Constants
| Name | Data Type | Default Value | Description |
|---|---|---|---|
| Delay (minutes) | Numeric | 15 | The delay represents a span of time in minutes during which the vav must be in a fault state before the rule starts to actually report that is is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time. |
3.4.12.1 - Zone Temperature Setpoint Dead Band is Too Low
Summary
The Zone temperature setpoint dead band is too low. A minimum difference if 5ºF between cooling and heating setpoint is required by ASHRAE Standard 90.1 2016 - Section 6.4.3.1.2. Dead Band.
| Equipment Type | Equipment Tag Constraints | Tuple Constraints |
|---|---|---|
| uv | -- | EffCoolSp & EffHeatSp || OccCoolSp & OccHeatSp |
Input Points
| Name | Point Templates | Positional Requirements | Optionality | Multiplicity |
|---|---|---|---|---|
| Occupied Cooling Setpoint | OccCoolSp | This point must be a direct child of the equipment that the rule is attached to. | Optional | Scalar |
| Occupied Heating Setpoint | OccHeatSp | This point must be a direct child of the equipment that the rule is attached to. | Optional | Scalar |
| Effective Cooling Setpoint | EffCoolSp | This point must be a direct child of the equipment that the rule is attached to. | Optional | Scalar |
| Effective Heating Setpoint | EffHeatSp | This point must be a direct child of the equipment that the rule is attached to. | Optional | Scalar |
Input Constants
| Name | Data Type | Default Value | Description |
|---|---|---|---|
| Delay (minutes) | Numeric | 30 | The delay represents a span of time in minutes during which the vav must be in a fault state before the rule starts to actually report that is is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time. |
| Deadband | Numeric | 5 | The minimum temperature dead band allowed. |
3.4.13.1 - Unexpected Temperature Decrease Across Cooling Coil
Summary
There is a decrease in temperature across the cooling coil with valve closed, indicating the cooling valve may be leaking. This will lead to increased operating costs and comfort complaints.
| Equipment Type | Equipment Tag Constraints | Tuple Constraints |
|---|---|---|
| uv | -- | -- |
Input Points
| Name | Point Templates | Positional Requirements | Optionality | Multiplicity |
|---|---|---|---|---|
| DA Fan Status (single or common) | DaFanSts | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Discharge Air Temperature | DaTemp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Mixed Air Temp | MaTemp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Cooling Command | ClgCmd | This point must be a direct child fo the equipment that the rule is attached to. | Mandatory | Scalar |
Input Constants
| Name | Data Type | Default Value | Description |
|---|---|---|---|
| Delay (minutes) | Numeric | 30 | The delay represents a span of time in minutes during which the vav must be in a fault state before the rule starts to actually report that is is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time. |
| Valve Threshold | Numeric | 1 | The valve command threshold. |
| Delta T | Numeric | 3 | The max temperature decrease allowed across coil. |
3.4.14.1- Unexpected Temperature Increase Across Heating Coil
Summary
There is an increase in temperature across the heating coil with valve closed, indicating the heating valve may be leaking or sensor(s) is out of calibration. This will lead tp increased operating cost and comfort complaints.
| Equipment Type | Equipment Tag Constraints | Tuple Constraints |
|---|---|---|
| uv | -- | -- |
Input Points
| Name | Point Templates | Positional Requirements | Optionality | Multiplicity |
|---|---|---|---|---|
| DA Fan Status (single or common) | DaFanSts | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Discharge Air Temperature | DaTemp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Mixed Air Temp | MaTemp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Heating Command | HtgCmd | This point must be a direct child fo the equipment that the rule is attached to. | Mandatory | Scalar |
Input Constants
| Name | Data Type | Default Value | Description |
|---|---|---|---|
| Delay (minutes) | Numeric | 30 | The delay represents a span of time in minutes during which the vav must be in a fault state before the rule starts to actually report that is is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time. |
| Valve Threshold | Numeric | 1 | The valve command threshold. |
| Delta T | Numeric | 3 | The max temperature decrease allowed across coil. |
3.4.15.1 - Freezestat Has Tripped
Summary
The Freezestat has sensed a potential freezing condition and has shutdown the unit to prevent damage to the unit.
| Equipment Type | Equipment Tag Constraints | Tuple Constraints |
|---|---|---|
| uv | -- | -- |
Input Points
| Name | Point Templates | Positional Requirements | Optionality | Multiplicity |
|---|---|---|---|---|
| Freeze Status | FreezeStat | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
Input Constants
| Name | Data Type | Default Value | Description |
|---|---|---|---|
| Delay (minutes) | Numeric | 0 | The delay represents a span of time in minutes during which the vav must be in a fault state before the rule starts to actually report that is is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time. |
3.4.17.1 - Leaving Preheat Coil Temperature is Falling Below Low Limit Temperature Setpoint
Summary
The temperature leaving the preheat coil is below low limit temperature setpoint, which could lead to freezestat trips or freezing coil.
| Equipment Type | Equipment Tag Constraints | Tuple Constraints |
|---|---|---|
| uv | -- | -- |
Input Points
| Name | Point Templates | Positional Requirements | Optionality | Multiplicity |
|---|---|---|---|---|
| Mixed Air Temperature Low Limit Setpoint | MaTempLoLmtSp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| PreHeat Coil Air Leaving Temp | PreHCALTemp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
Input Constants
| Name | Data Type | Default Value | Description |
|---|---|---|---|
| Delay (minutes) | Numeric | 0 | The delay represents a span of time in minutes during which the vav must be in a fault state before the rule starts to actually report that is is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time. |
| Threshold | Numeric | 0.5 | The preaheat coil leaving air temperature error threshold. |
3.4.18.1 - Mixed Air Dampers Unable to Meet Discharge Air Temperature Setpoint When Outside Air Temperature is Low Enough
Summary
When mixed air dampers are 100% and outside air temperature is low enough to meet discharge air temperature setpoint, but cannot meet setpoint.
| Equipment Type | Equipment Tag Constraints | Tuple Constraints |
|---|---|---|
| uv | -- | OaTemp || OaTempOnPremWS || OaTempOffPremWS |
Input Points
| Name | Point Templates | Positional Requirements | Optionality | Multiplicity |
|---|---|---|---|---|
| DA Temp Setpoint | DaTempSp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Da Fan Status (single or common) | DaFanSts | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Discharge Air Temperature | DaTemp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Outside Air Temperature | OaTemp | This point must be a direct child of the equipment that the rule is attached to. | Optional | Scalar |
| Outside Air Temperature Off Prem Weather Station | OaTempOffPremWS | This point must be a direct child of the this rules equipment ancestors child off prem weather station. | Optional | Scalar |
| Outside Air Temperature On Prem Weatherstation | OaTempOnPremWS | This point must be a direct child of this rules equipment ancestors child on prem weather station. | Optional | Scalar |
Input Constants
| Name | Data Type | Default Value | Description |
|---|---|---|---|
| Delay (minutes) | Numeric | 15 | The delay represents a span of time in minutes during which the vav must be in a fault state before the rule starts to actually report that is is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time. |
| Threshold | Numeric | 5 | The preaheat coil leaving air temperature error threshold. |
3.4.19.1 - Outside Air Temperature Too High For Free Cooling Only
Summary
Outside air temperature too high for free cooling without additional mechanical cooling.
| Equipment Type | Equipment Tag Constraints | Tuple Constraints |
|---|---|---|
| uv | -- | OaTemp || OaTempOnPremWS || OaTempOffPremWS & EffCoolSp || OccCoolSp || ZoneTempSp |
Input Points
| Name | Point Templates | Positional Requirements | Optionality | Multiplicity |
|---|---|---|---|---|
| Da Fan Status (single or common) | DaFanSts | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Heating Command | HtgCmd | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Cooling Command | ClgCmd | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Outside Air Damper Position | OaDmprPos | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Outside Air Temperature | OaTemp | This point must be a direct child of the this rules equipment ancestors child off prem weather station. | Mandatory | Scalar |
| Effective Cooling Setpoint | EffCoolSp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Zone Temperature | ZoneTemp | This point must be a direct child of the equipment that the rule is attached to. | Optional | Scalar |
| Outside Air Temperature On Prem Weatherstation | OaTempOnPremWS | This point must be a descendant of this rules equipment ancestor | Optional | Scalar |
| Occupied Cooling Setpoint | OccCoolSp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Zone Temperature Setpoint (effective) | ZoneTempSp | This point must be a direct child of the equipment that the rule is attached to. | Optional | Scalar |
| Outside Air Temperature Off Prem Weather Station | OaTempOffPremWS | This point must be a ddescendant of this rules equipment ancestor. | Optional | Scalar |
Input Constants
| Name | Data Type | Default Value | Description |
|---|---|---|---|
| Delay (minutes) | Numeric | 15 | The delay represents a span of time in minutes during which the vav must be in a fault state before the rule starts to actually report that is is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time. |
| Heating Command | Numeric | 0 | The heating command threshold. |
| Cooling Command | Numeric | 0 | The cooling command threshold. |
| Outside Air Temperature Limit | Numeric | 70 | The outside air temperature limit threshold. |
| Outside Air Damper Position | Numeric | 100 | The outside air damper position threshold. |
3.4.20.1 - Outside and Mixed Temperature Should be Approximately Equal During Mechanical and Free Cooling Mode
Summary
Outside and mixed air temperature should be approximately equal during mechanical and free cooling mode.
| Equipment Type | Equipment Tag Constraints | Tuple Constraints |
|---|---|---|
| uv | -- | OaTemp || OaTempOnPremWS || OaTempOffPremWS |
Input Points
| Name | Point Templates | Positional Requirements | Optionality | Multiplicity |
|---|---|---|---|---|
| Mixed Air Temp | MaTemp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Da Fan Status (single or common) | DaFanSts | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Heating Command | HtgCmd | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Cooling Command | ClgCmd | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Outside Air Damper Position | OaDmprPos | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Outside Air Temperature On Prem Weather Station | OaTempOnPremWS | This point must be a descendant of this rule's ancestor. | Optional | Scalar |
| Outside Air Temperature | OaTemp | This point must be a direct child of the equipment that the rule is attached to. | Optional | Scalar |
| Outside Air Temperature Off Prem Weather Station | OaTempOffPremWS | This point must be a child of this rules ancestor. | Optional | Scalar |
Input Constants
| Name | Data Type | Default Value | Description |
|---|---|---|---|
| Delay (minutes) | Numeric | 15 | The delay represents a span of time in minutes during which the vav must be in a fault state before the rule starts to actually report that is is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time. |
| Mixed Air Temperature Error | Numeric | 5 | The mixed air temperature error threshold. |
| Outside Air Temperature Error | Numeric | 2 | The outside air temperature error threshold. |
| Heating Command | Numeric | 0 | The heating command threshold. |
| Cooling Command | Numeric | 0 | The cooling command threshold. |
| Outside Air Damper Position | Numeric | 100 | The outside air damper position threshold. |
3.4.21.1 - Outside Air Temperature Too Low for 100% Outside Air Cooling During Mechanical and Free Cooling Mode
Summary
Outside air temperature is too low for 100% outside air cooling during mechanical and free cooling mode.
| Equipment Type | Equipment Tag Constraints | Tuple Constraints |
|---|---|---|
| uv | -- | OaTemp || OaTempOnPremWS || OaTempOffPremWS |
Input Points
| Name | Point Templates | Positional Requirements | Optionality | Multiplicity |
|---|---|---|---|---|
| Mixed Air Temperature Low Limit Setpoint | MaTempLoLmtSp | Mandatory | Scalar | |
| Da Fan Status (single or common) | DaFanSts | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Heating Command | HtgCmd | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Cooling Command | ClgCmd | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Outside Air Damper Position | OaDmprPos | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Outside Air Temperature On Prem Weather Station | OaTempOnPremWS | This point must be a descendant of this rule's ancestor. | Optional | Scalar |
| Outside Air Temperature | OaTemp | This point must be a direct child of the equipment that the rule is attached to. | Optional | Scalar |
| Outside Air Temperature Off Prem Weather Station | OaTempOffPremWS | This point must be a child of this rules ancestor. | Optional | Scalar |
Input Constants
| Name | Data Type | Default Value | Description |
|---|---|---|---|
| Delay (minutes) | Numeric | 15 | The delay represents a span of time in minutes during which the vav must be in a fault state before the rule starts to actually report that is is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time. |
| Discharge Air Temperature Error | Numeric | 5 | The discharge air temperature error threshold. |
| Outside Air Temperature Error | Numeric | 2 | The outside air temperature error threshold. |
| Heating Command | Numeric | 0 | The heating command threshold. |
| Cooling Command | Numeric | 0 | The cooling command threshold. |
| Outside Air Damper Position | Numeric | 100 | The outside air damper position threshold. |
| Discharge Air Fan Temperature | Numeric | 2 | The discharge air fan temperature rise threshold. |
3.4.22.1 - Discharge Air Temperature Too High During Mechanical and/or Free Cooling
Summary
Discharge air temperature too high during mechanical and/or free cooling; should be less than mixed air temperature.
| Equipment Type | Equipment Tag Constraints | Tuple Constraints |
|---|---|---|
| uv | -- | -- |
Input Points
| Name | Point Templates | Positional Requirements | Optionality | Multiplicity |
|---|---|---|---|---|
| Da Fan Status (single or common) | DaFanSts | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Discharge Air Temperature | DaTemp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Mixed Air Temp | MaTemp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Heating Command | HtgCmd | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Cooling Command | ClgCmd | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Outside Air Damper Position | OaDmprPos | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Outside Air Damper Minimum Position Setpoint | OaDmprMinPosSp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
Input Constants
| Name | Data Type | Default Value | Description |
|---|---|---|---|
| Delay (minutes) | Numeric | 15 | The delay represents a span of time in minutes during which the vav must be in a fault state before the rule starts to actually report that is is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time. |
| Discharge Air Fan Temperature | Numeric | 2 | The discharge air fan temperature threshold. |
| Mixed Air Temperature Error | Numeric | 5 | The mixed air temperature error threshold. |
| Heating Command | Numeric | 0 | The heating command threshold. |
| Outside Air Damper Position | Numeric | 100 | The outside air damper position threshold. |
| Discharge Air Temperature Error | Numeric | 2 | The discharge air temperature error threshold. |
| Cooling Command | Numeric | 0 | The cooling command threshold. |
3.4.23.1 - Discharge Air Temperature Too High in Full Cooling
Summary
Discharge air temperature too high in full cooling during full mechanical cooling.
| Equipment Type | Equipment Tag Constraints | Tuple Constraints |
|---|---|---|
| uv | -- | -- |
Input Points
| Name | Point Templates | Positional Requirements | Optionality | Multiplicity |
|---|---|---|---|---|
| Da Fan Status (single or common) | DaFanSts | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Discharge Air Temperature | DaTemp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Mixed Air Temp | MaTemp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Heating Command | HtgCmd | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Cooling Command | ClgCmd | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Outside Air Damper Position | OaDmprPos | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Outside Air Damper Minimum Position Setpoint | OaDmprMinPosSp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Effective Cooling Setpoint | EffCoolSp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Occupied Cooling Setpoint | OccCoolSp | This point must be a direct child of the equipment that the rule is attached to. | Mandatory | Scalar |
| Zone Temperature Setpoint (effective) | ZoneTempSp | This point must be a direct child of the equipment tat the rule is attached to. | Mandatory | Scalar |
Input Constants
| Name | Data Type | Default Value | Description |
|---|---|---|---|
| Delay (minutes) | Numeric | 15 | The delay represents a span of time in minutes during which the vav must be in a fault state before the rule starts to actually report that is is in a fault state. The intent of the delay is to reduce the level of alert noise by ensuring that the system does not alert until the fault condition has been in effect for some minimal interval of time. |
| Discharge Air Temperature | Numeric | 2 | The discharge air temperature error threshold. |
| Maximum Cooling Command | Numeric | 99 | The maximum cooling command threshold. |
| Heating Command | Numeric | 0 | The heating command threshold. |