VariTrac II Central Control Panel VAV Boxes

Active Max Flow Setpoint

Numeric

The maximum flow setpoint presently in use by the UCM.Units: percent

Active Min Flow Setpoint

Numeric

The minimum flow setpoint presently in use by the UCM.Units: percent

Air Valve Drive Max: Local Ovrd

Binary

Indicates if at least one of the UCM’s thumbwheel inputs has been used to request that the air valve be driven to its maximum position/flow. 0=No, 1=Yes

Air Valve Flow

Numeric

This is the calculated value of the flow in terms of cubic feet per minute (CFM).

Air Valve Max Flow Stpnt: Local

Numeric

This property indicates the UCM-resident value of the maximum flow setpoint. This value is represented in terms of percent of the nominal size rating of the unit.

Air Valve Min Flow Stpnt: Local

Numeric

This property indicates the UCM-resident edited cooling minimum flow setpoint. This value is represented in terms of percent of the nominal size rating of the unit.

Air Valve Override Status

Multi-State

The flow override condition of the UCM.
1=Open
2=Closed
3=Min
4=Max
5=Auto

Air Valve Position

Numeric

Indicates the percent open position of the air valve. Range: 0 to 100%

Air Valve Position Control Used

Binary

Indicates if the UCM is using position control. 0=No (Flow control) 1=Yes (Position control)

Note: Position control is used when the flow sensor has failed or does not exist.

Air Valve Size Index

Numeric

The index value used to determine the nominal CFM rating of the unit.

Air Vlv Min Heat Flow Stpnt: Loc

Numeric

This property indicates the UCM-resident edited heating minimum flow setpoint. This value is represented in terms of percent of the nominal size rating of the unit.

Auxiliary Temperature

Numeric

Indicates the temperature reported by the optional thermistor connected to the auxiliary sensor input on the UCM. Range: 25 to 190°F

Calibration in Effect

Binary

Indicates if the UCM is presently calibrating its air valve (taking a zero flow reading). 0=Normal, 1=Recalibrate

Call Status

Multi-State

This is the heat/cool call status of the UCM.0=" ": The UCM has a vote but is not currently calling for heating or cooling.
1="H": Heat Caller
2="H+": Strong Heat Caller
3="C": Cool Caller
4="C+": Strong Cool Caller
5="Tag": The UCM has had problems reaching its setpoint and has been tagged by the CCP. It does not have a heat/cool vote.
6="N/V": The UCM does not get a heat/cool vote because its zone temp has failed; it is edited to not have a vote; or it has been flow overridden to closed.

Communication State

Binary

This property will be Down if the UCM is not communicating with the Central Control Panel or if the Central Control Panel is not communicating with the BCU. 0=Down, 1=Up

Control Action

Binary

The heat/cool control action is automatically determined by the VariTrac II Central Control Panel for each UCM. The Central Control Panel determines a UCM’s heat/cool control action by comparing the system’s supply air temperature with the UCM’s zone temperature. The control action will indicate if there is warm or cold air in the supply duct. 0=Heating, 1=Cooling

Control Mode

Binary

Indicates if the UCM is occupied. 0=Occupy, 1=Unoccupy

Control Offset Value

Numeric

The value used by the control offset function to adjust the setpoints when the control offset is active.Range: 0 to 5F

Cooling Setpoint Low Limit

Numeric

The active cooling setpoint does not go below this limit regardless of the source of the setpoint. Range: 45 to 100F

Cooling Setpoint: Active

Numeric

The actual cooling setpoint in use by the UCM. Range: 45 to 95F

Diag: Aux Sensor Fail

Binary

Indicates if the auxiliary temperature sensor has failed or does not exist. 0=Normal, 1=Failed

Diag: Flow Sensor Fail

Binary

Indicates if the flow sensor has failed or does not exist.0=Normal, 1=Failed

Diag: Low Battery Exists

Binary

Indicates if any of the wireless zone sensors associated with the UCM are reporting a low battery voltage. 0=No, 1=Yes

Diag: Setpoint Fail Global

Binary

Indicates if all thumbwheel setpoints associated with this UCM have failed. This takes into account wireless thermostats, if used. 0=Normal, 1=Failed

Diag: Zone Sensor Fail Global

Binary

Indicates if all the zone sensors associated with this UCM have failed. This takes into account wireless thermostats, if used. 0=Normal, 1=Failed

Fan Control Method: Local

Binary

Indicates whether the UCM controls the parallel fan based on a temperature or flow setpoint. 0=Temp, 1=Flow

This property only applies to parallel fan-powered VAVs.

Fan Control Offset

Numeric

If "Fan Control Method: Local" is "Temp", this offset determines when the parallel fan is energized. This property is specified as a temperature offset above the zone heating setpoint. Range: 0 to 10°F

This property only applies to parallel fan-powered VAVs.

Fan Control Setpoint: Local

Numeric

If "Fan Control Method: Local" is "Flow", this setpoint determines when the parallel fan is energized. This setpoint is expressed as a percentage of the unit’s nominal size rating. Range: 0 to 100%

This property only applies to parallel fan-powered VAVs.

Fan Exists

Binary

Indicates if the UCM is configured to control a fan.0=No Fan, 1=Fan Present

Fan Output

Binary

The state of the UCM’s fan output. 0=Off, 1=On

Fan Type

Binary

If the unit is configured to have a fan, this property indicates the fan type. 0=Parallel Fan, 1=Serial Fan

Heat Active

Binary

The state of the UCM’s heat output(s). 0=Off, 1=On

Heat Exists

Binary

Indicates if the UCM is configured to control its heat outputs. 0=No Heat Available, 1=Heating Available

Heat Setpoint High Limit

Numeric

The active heating setpoint does not go above this limit regardless of the source of the setpoint. Range: 45 to 100F

Heat Setpoint Offset: Local

Numeric

This value is subtracted from the thumbwheel setpoint to determine the active heating setpoint when the thumbwheel setpoint is enabled. Range: 2 to 10°F

Heat/Cool Vote Enable

Binary

Indicates if the UCM is allowed to have a heat/cool vote and can influence the CCP’s changeover calculations.0=Disabled, 1=Auto

Heating Setpoint: Active

Numeric

The heating setpoint currently being used by the UCM.Range: 45 to 95F

Local Name

Character

This is the name of the UCM. This name differs from the "Object Name" in that it is stored at the VariTrac II Central Control Panel.

Object Identifier

Object ID

Unique hexadecimal identifier of this particular object. This ID is used internally to identify a standard object.

Object Name

Character

This property allows the assignment of a unique printable name to the object for user identification.

Object Type

Object Type

This property designates the object’s type (e.g., VariTrac II CCP VAV UCM).

Occupied Cool Setpoint: Local

Numeric

The UCM-resident edited occupied cooling setpoint.Range: 45 to 95°F

Occupied Heat Setpoint: Local

Numeric

The UCM-resident edited occupied heating setpoint.Range: 45 to 95°F

Occupied OA Required Setpoint

Numeric

Used to calculate the ventilation ratio during occupied operation. Units: CFM. Range: 0 to 100% of the unit’s nominal size rating.

Parent ID

Object ID

Specifies the VariTrac II CCP System object to which this UCM belongs.

Security Class

Numeric

This property identifies the security class to be used for access privileges to the given object.

Software Revision

Numeric

The version of software loaded into the UCM.

Thumbwheel Composite

Numeric

The composite thumbwheel setpoint which takes into account wireless thermostat values. Range: 45 to 95F

Thumbwheel Setpoint Enable

Binary

Indicates if the thumbwheel setpoint is in use. 0=No Thermostat Setpoint,1=Thermostat Setpoint

UCM Number

Numeric

The number (1-16) by which the UCM is known within the CCP.

Unit Type

Binary

Indicates if the UCM is configured to control a VariTrane or VariTrac box. 0=Not VariTrac, 1=VariTrac

This property only applies if "Unit Type is Trane" is Yes.

Unit Type is Trane

Binary

Indicates if the UCM is configured to control a Trane unit (as opposed to a generic unit). 0=No, 1=Yes

Unoccupied Cool Setpoint: Local

Numeric

The UCM-resident, edited, unoccupied cooling setpoint.Range: 45 to 95°F

Unoccupied Heat Setpoint: Local

Numeric

The UCM-resident edited unoccupied heating setpoint. Range: 45 to 95°F

Unoccupied Override: Local

Binary

Indicates if the local thumbwheel override to unoccupied is initiated. 0=No, 1=Yes

Update Tag

Numeric

Object instance update tag. This tag is used to indicate that the nonvolatile memory resident data within the particular instance has changed. The workstation is the primary user of this property.

Ventilation Ratio Calc

Numeric

This ratio is calculated by dividing the outdoor air requirement by the current flow or damper position.

Note: During unoccupied operation, the Unoccupied Outdoor Air Requirement (edited at the CCP) is used in this calculation.

Zone Temp Composite

Numeric

The actual zone temperature being used by the UCM which takes into account wireless thermostat values, if used. Range: 0 to 125F