Space Comfort Controller

Property

Type

Description

Active Circuit[1-8]

Enumerated

This is the status of the condenser circuits reported by the controller. This indicates if each stage 1-8 is present or not, and if it is on or off:
0 = Off
1 = On
2 = Not Present

Air Flow Override: Tracer

Multi-State

Used to communicate override commands for air valve. In Tracer Summit version 15 and newer this property can not be read (you'll see '???' displayed) because it only initiates an air flow override.
0 = Normal
3 = All valves to percent of Maximum Flow (Enum is actually set by VAS editor, not SCC editor.)
4 = Open all valves
5 = Close all valves
6 = All valves to minimum
7 = All valves to maximum

Air Flow Stpnt: Active Min

Float

This property represents the active minimum flow setpoint read from the VAV. This property only applies to a Trane VAV box with its cabinet style configured as Space Temperature Controller or Ventilation Flow Controller.

Valid Range: 0-65,534 L/s

Air Flow Stpnt: Active Min Sourc

Enumerated

This property indicates which minimum is enforcing the “Air Flow Stpnt: Active Min” property. This property only applies to a Trane VAV box with its cabinet style configured as Space Temperature Controller or Ventilation Flow Controller. Valid Range:
0 = None (no min enforced)
1 = Cooling Minimum
2 = Heating Minimum
3 = Local Heating Minimum
4 = Standby Cooling Minimum
5 = Standby Heating Minimum
6 = Derived from Ventilation Requirements
7 = Pressure Dependent Mode Min
255 = Invalid

Air Flow Stpnt: Min Local Heat

Float

Defines the minimum flow through the VAV that is necessary to safely operate the reheat capability of a VAV with reheat. This value must be less than or equal to the “Heating Maximum Flow” property.

If the controller is a Trane VAV box then this property only affects the operation of the controller if its cabinet style is configured as Space Temperature Controller or Ventilation Flow Controller.

Valid Range: 0 – 10, 000 L/s (0 – 21,189 cfm)

Air Flow Stpnt: Min Standby Heat

Float

Defines the minimum flow setpoint while in the occupied standby heating mode. This value must be less than or equal to the “Heating Maximum Flow” property.

If the controller is a Trane VAV box then this property only affects the operation of the controller if its cabinet style is configured as Space Temperature Controller.

Valid Range: 0 – 10, 000 L/s (0 – 21,189 cfm)

Air Flow Stpnt: Tracer

Float

This is the measured supply airflow, typically provided by a flow sensor.

If the controller is a Trane VAV box then this property only affects the operation of the controller if its cabinet style is configured as Ventilation Flow Controller or Flow Tracking Controller.

Valid Range: 0 – 65,000 L/s (0 – 137,728 cfm)

Air Valve Position

Float

This property represents the cool output valve position (if valid) or the primary heat output valve position (if valid) of the VAV. If both cooling position and primary heating position values are reported from the VAV the BCU will report the greater of the two values.

Valid Range: 0 – 100%

Air Valve Drive Closed: Ref

Property Reference

This property only applies to sites that use a v14.XXX BCU image or older.

This property indicates the value to be used by the BCU to communicate override commands for the Air Flow Override.

0 = Auto
1 = Close all valves

Air Valve Drive Max: Ref

Property Reference

This property only applies to sites that use a v14.XXX BCU image or older.

This property indicates the value to be used by the BCU to communicate override commands for the Air Flow Override.

0 = Auto
1 = All valves to maximum

Air Valve Drive Min: Ref

Property Reference

This property only applies to sites that use a v14.XXX BCU image or older.

This property indicates the value to be used by the BCU to communicate override commands for the Air Flow Override.

0 = Auto
1 = All valves to minimum

Air Valve Drive Open: Ref

Property Reference

This property only applies to sites that use a v14.XXX BCU image or older.

This property indicates the value to be used by the BCU to communicate override commands for the Air Flow Override.

0 = Auto
1 = Open all valves

Airflow: Active

Numeric

This property indicates the active airflow, if the UCM has a local or communicated airflow value.

Alarm Event Class

Numeric

This arrayed property specifies the event classes to which Informational Message and Service Required alarm messages are routed. The event class has a set of receivers as determined in Site Configuration that will receive the alarm messages.

Alarm Present

Binary

This indicates that the unit has a diagnostic

0 = No diagnostics
1 = One or more diagnostics

Alarm Reset

Binary

Used to directly set nviRequest, enumeration 10 (clear alarm). The alarm state of the object is cleared, but the state of the object itself may remain unchanged. Persistent alarms will be reported, as they are re-detected. '???' will be displayed because this is handled as a momentary command state, so there is no real value that can be read. The range below is more for an object like a binary output that is used to reference the Alarm Reset property.

Valid Range:

0 = reset disabled (default value)
1 = clear/reset alarm

Alarms Locked

Binary

The value of this property is TRUE when clearing alarms remotely is not supported by the UCM.

0 = (False) Clear alarm request is supported
1 = (True) Clear alarm request is not supported

Application Mode: Tracer

Multi-State

Used to communicate the application mode of the unit.

Valid Range:

1 = Heat
2 = Morning Warm-up
3 = Cool
4 = Night Purge
5 = Pre Cool
6 = Off
7 = Test
8 = Emergency Heat
9 = Fan Only
10= Free Cool
11= Ice-Making
12= Max Heat
13= Economy Mode
14= Dehumidifying
15= Calibrate

Autocommissioning Cmd: Tracer

Enumerated

This property is used by the BCU to command the VAV to execute its autocommissioning sequence. Full use of this function requires the presence of an auxiliary temperature sensor in the discharge air stream (without it the fan and reheat operation cannot be tested). This property can not be read (you'll see '???' displayed) because it only initiates the autocommissioning command. This property applies only to a Trane VAV box.

Valid Range:

0 = Begin After Staggered Delay
1 = Begin Immediately
2 = Abort

Autocommissioning Air Valve Pos[1-2]

Float

This property is used to report the air valve positions measured during the last autocommissioning sequence. The VAV keeps the results until another autocommissioning sequence is run. This property applies only to Trane VAV boxes.

Array element definitions:
[1] = 40% flow position (i.e. valve position to achieve 40% of the 'Maximum Flow' property)
[2] = 100% flow position. position (i.e. valve position to achieve 100% of the 'Maximum Flow' property)

Valid range for each array element:
0-100%,
0x7FFF(NAN) = Either means that no autocommissioning process has occurred since the UCM was last reset or that the property is not valid.

Autocommissioning Disch Air Temp[1-7]

Float

This property is used to report the discharge air temperatures measured during the last autocommissioning sequence. The VAV keeps the results until another autocommissioning sequence is run. This property applies only to Trane VAV boxes.

Array element definitions:

[1] = fan flow initial temperature (i.e. temperature while fan in VAV is off and air valve is open to cooling max),
[2] = fan flow final temperature (i.e. temperature while fan in VAV is on and air valve is closed),
[3] = reheat initial temperature (i.e. temperature while reheat is off)
[4] = hot water final temperature,
[5] = electric stage 1 temperature,
[6] = electric stage 2 temperature,
[7] = electric stage 3 temperature.

Typical range for each array element:
32.0-122.0 deg F (0-50 deg C),
0x7FFF(NAN) = Either means that no autocommissioning process has occurred since the UCM was last reset, the array element does not apply to the Trane VAV box, or that the property is not valid.

Autocommissioning State

Enumerated

This property is used to indicate the status of an auto commission sequence. This property applies only to a Trane VAV box.

Valid Range:

0 = Waiting
1 = Calibrating
2 = Flow Test
3 = Fan Test
4 = Reheat Test
5 = Finished
6 = Aborted
0xFF(255) = Default. (Either means that no autocommissioning process has occurred since the UCM was last reset or that the property is not valid.)

Autocommissioning Time Stamp

Date/Time Numeric

This property is used to report the date and time of the last autocommissioning sequence. The VAV stores the results until another autocommissioning sequence is run. This property applies only to Trane VAV boxes.

Auxiliary Heat Control: Ref

Property Reference

This property indicates the value to be used by the BCU to determine which value to communicate as the Auxiliary Heat Enable Input.

If the controller is a Trane VAV box then this property only affects the operation of the controller if its cabinet style is configured as Space Temperature Controller or Ventilation Flow Controller.

0 = Disable all stages
1 = Enable all stages

Auxiliary Heat Control: Tracer

Binary

Used to enable/disable all stages of auxiliary heat in the controller.

If the controller is a Trane VAV box then this property only affects the operation of the controller if its cabinet style is configured as Space Temperature Controller or Ventilation Flow Controller.

0 = Disable all stages
1 = Enable all stages

Cabinet Style

Multi-State

Defines the cabinet style based on the Unit Type.

Comm5 Communication State

Numeric

Obsolete name as of v16SP2. Refer to LonTalk Communication State property for a description.

Comm5 Device NID

Bytestring

Obsolete name as of v16SP2. Refer to LonTalk Device NID property for a description.

Comm5 DSN

Unsignedlongword

Obsolete name as of v16SP2. Refer to LonTalk DSN property for a description.

Comm5 Program ID

Numeric

Obsolete name as of v16SP2. Refer to LonTalk Program ID property for a description.

Communication Channel

Numeric

This property provides access to the assigned communications channel value of the UCM being represented.

Compressor Control: Loop Control

Binary

Used to propagate an immediate and latched compressor disable to the controller. If its' value is "disable," this sets Compressor Control: Tracer and the VM-based value to disable. Auto only causes the VM-based value to be set to auto. (The BCU will evaluate the VM-based value along with other factors to set the Compressor Control: Tracer to auto.)

Valid Range:

0 = Disable,
1 = Auto (default)

Compressor Control: Ref

Property Reference

This property indicates the value to be used by the BCU to determine which value to communicate as the Compressor Enable Input.

0 = Disable
1 = Auto

Compressor Control: Tracer

 Binary

Used to communicate the compressor enable input to the controller.

0 = Disable
1 = Auto

Condenser Type

Enumerated

Condenser type. Valid range:

0 = none
1 = air-cooled condenser
2 = water-cooled condenser
0xFF = invalid (default) ignore other nvoCondStatus properties.

Condenser Water Flow Status

Boolean

The local or communicated condenser water flow. Valid Range:

0 = no flow,
non-0 = Flow.

Condenser Water Pump Output

Boolean

The hardwired condenser water pump status.

Valid Range:
0 = Off,
non-0 = On.

Condenser Water Temp Entering

Float

The local temperature of the water entering the condenser.

Condenser Water Temp Leaving

Float

The local temperature of the water leaving the condenser.

Configuration: Unit Type Profile

Multi-State

Defines the type of unit. All devices that meet the SCC Profile use this property.

0 = Generic
1 = Fan Coil – Generic
2 = VAV
3 = Heat Pump
4 = Rooftop
5 = Unit Ventilator
6 = Chilled Ceiling
7 = Radiator
8 = AHU
9 = Self-Contained

Configuration: Unit Type Trane

Multi-State

Defines the type of unit. This property is used for Trane products only.

0 = 1 Heat/1 Cool
1 = Heat Pump
2 = Blower Coil
3 = Unit Ventilator
4 = Fan Coil
5 = Rooftop
6 = Air Handler
7 = Vertical Self Contained
8 = Unitary
9 = VAV Box
10= Fan Coil (applies to the ZN523)

Control Event Class

Numeric

This property determines where control messages are routed when the object's present value is controlled.

Cool Output

Numeric

Status of the unit's cool capacity (if hydronic, report valve position of cool valve). Range: 0 to 100%

Cool Setpoint High Limit

Numeric

The local or communicated occupied cooling setpoint high limit. If both exist, the communicated value has priority. Range: 40.00 to 115.00°F (4.44 to 46.11°C)

Cool Setpoint Occupied

Numeric

This property defines the occupied cooling setpoint.

If the controller is a Trane VAV box then this property only affects the operation of the controller if its cabinet style is configured as Space Temperature Controller.

Range: 40.00 to 115.00°F (4.44 to 46.11°C)

Cool Setpoint Occupied Standby

Numeric

This property defines the occupied standby cooling setpoint.

If the controller is a Trane VAV box then this property only affects the operation of the controller if its cabinet style is configured as Space Temperature Controller.

Range: 40.00 to 115.00°F (4.44 to 46.11°C)

Cool Setpoint Unoccupied

Numeric

This property defines the unoccupied cooling setpoint.

If the controller is a Trane VAV box then this property only affects the operation of the controller if its cabinet style is configured as Space Temperature Controller.

Range: 40.00 to 115.00°F (4.44 to 46.11°C)

Cool Stage Status[1-8]

Multi-State

Indicates if cool stage 1-8 is present or not, and if it is on or off. 0 = Off 1 = On 2 = Not Present

Cool Type

Multi-State

Defines the cool type of the unit.

0 = None
1 = Modulating Cold Water
2 = Binary Cold Water
5 = Modulating DX
6 = 1 Stage DX
7 = 2 Stage DX
8 = 3 Stage DX
9 = 4 Stage DX
10= 5 Stage DX
11= 6 Stage DX
17 = Modulating Air
22 = Wild Coil
23 = Face Bypass Wild Cold Water
25 = Face Bypass Modulating Cold Water
27 = Face Bypass Binary Cold Water
32 = 2 Stage Air-Cooled DX 1 circuit 2 compr relays
33 = 2 Stage Air-Cooled DX 2 circuit 2 compr relays
34 = 3 Stage Air-Cooled DX 1 circuit 2 compr relays
35 = 3 Stage Air-Cooled DX 2 circuit 2 compr relays
36 = 2 Stage Water-Cooled DX 1 circuit 2 compr relays
37 = 2 Stage Water-Cooled DX 2 circuit 2 compr relays
38 = 3 Stage Water-Cooled DX 1 circuit 2 compr relays
39 = 3 Stage Water-Cooled DX 2 circuit 2 compr relays
40 = 3 Stage Air-Cooled DX 2 circuit 3 compr relays
41 = 4 Stage Air-Cooled DX 2 circuit 3 compr relays
42 = 3 Stage Water-Cooled DX 2 circuit 3 compr relays
43 = 4 Stage Water-Cooled DX 2 circuit 3 compr relays
44 = 3 Stage Water-Cooled DX 3 circuit 3 compr relays
45 = 4 Stage Water-Cooled DX 3 circuit 3 compr relays
46 = 4 Stage Air-Cooled DX 2 circuit 4 compr relays
47 = 4 Stage Water-Cooled DX 2 circuit 4 compr relays
48 = 4 Stage Water-Cooled DX 4 circuit 4 compr relays

Cooling Setpoint Low Limit

Numeric

The local or communicated occupied cooling setpoint low limit If both exist, the communicated value has priority.

Range: 40.00 to 115.00°F (4.44 to 46.11°C)

Cooling Setpoint Shift: Ref

Property Reference

This property indicates the value to be used by the BCU to shift the occupied and occupied standby cooling setpoints. Unoccupied cooling setpoints are not shifted.

Range: -18.0 to 18.0°F (-10.0 to 10.0°C degrees)

Cooling Setpoint Shift: Tracer

Numeric

Used to shift the occupied and occupied standby cooling setpoints. Unoccupied cooling setpoints are not shifted.

Range: -180 to 180 F degrees (-10.0 to 10.0°C degrees)

Critical Application Alarming

 Binary

This property changes a select group of priority 2 alarms (service request) to priority 3 alarms (critical). This pre- defined group of alarms may vary for each UCM.

0 = Disabled (default)
1 = Enabled

Default Cooling Fan Cycling

 Binary

Defines the default fan cycling operation of the unit in cooling modes.

0 = Cycling Fan in Cooling
1 = Continuous Fan in Cooling

Default Cooling Fan Speed

Multi-State

Defines the default fan speed operation of the unit in cooling modes.

0 = Not Used
1 = Default Cooling Fan Speed Off
2 = Default Cooling Fan Speed Low
4 = Default Cooling Fan Speed Medium
8 = Default Cooling Fan Speed High
16 = Default Cooling Fan Speed Auto

Default Heating Fan Cycling

 Binary

Defines the default fan cycling operation of the unit in heating modes.

0 = Cycling Fan in Heating
1 = Continuous Fan in Heating

Default Heating Fan Speed

Multi-State

Defines the default fan speed operation of the unit in heating modes.

0 = Not Used
1 = Default Heating Fan Speed Off
2 = Default Heating Fan Speed Low
4 = Default Heating Fan Speed Medium
8 = Default Heating Fan Speed High
16 = Default Heating Fan Speed Auto

Defrost Status

Enumerated

This property is used to report when the unit is in defrost mode.

Valid Range: 0 = Not defrosting 1 = Defrosting 2 = Not present

Dehumidification Control Status

Multi-State

Indicates if dehumidification (for 1 state only – the 1st stage) is present or not present, and if it is on or off.

Valid Range: 0 = Off 1 = On 2 = Not Present

Device Major Revision

UnsignedByte

This defines the major revision number for the device. The major revision of the device is updated whenever the network interface of the device changes.

Device Minor Revision

UnsignedByte

This defines the minor revision number for the device. The minor revision of the device is updated whenever the software is changed for any reason.

Diagnostic Alarm Status

Text String

Communicates the diagnostic messages of the controller as they occur.

Discharge Air Temp

Numeric

Status of the hardwired sensor on the unit.

Range: -40.00 to 212.00°F (-40.00 to 100.00 °C)

Display Active Setpoint

Binary

Allows the active space temperature setpoint in the UCM to be displayed at the zone sensor. This property only applies to Trane controllers (e.g., the ZN523).

Valid Range: 0 = “No” (Do Not Display) 1 = “Yes” (Display)

Display Active Space Temp

Binary

Allows the active space temperature in the UCM to be displayed at the zone sensor. This property only applies to Trane controllers (e.g., the ZN523).

Valid Range: 0 = “No” (Do Not Display) 1 = “Yes” (Display)

Economizer Control: Ref

Property Reference

This property indicates the value to be used by the BCU to determine which value to communicate as the Economizer Enable Input.

0 = Disabled
1 = Enabled
2 = Auto

Economizer Control: Tracer

Multi-State

This property indicates the value that will be communicated by the system to the UCM and used enable and disable the economizer control.

0 = Disabled
1 = Enabled
2 = Auto

Economizer Damper Position

Numeric

Status of unit's economizer damper position. (Not used if unit has 2-position OA damper)

Range: 0-100%

Economizer Enable: Active

Multi-State

This property reports whether it is even possible for the unit to economize, if one is present. (See 'Economizer Status' property for its on/off status).

0 = Disabled
1 = Enabled
2 = Not Present

Economizer Min Position: Ref

Property Reference

This property indicates the value to be used by the BCU to determine which value to communicate as the Economizer Minimum Position Input.

Range: 0 to 100 %

Economizer Min Position: Tracer

Numeric

This property indicates the value that will be communicated by the system to the UCM and used as the minimum position of the outdoor air damper.

Range = 0 to 100%

Economizer Minimum Position Occupied

Numeric

Indicates the outdoor air damper occupied minimum position:

Range: 0 to 100%

Economizer Minimum Position Occupied Standby

Numeric

Indicates the outdoor air damper occupied standby minimum position.

Range: 0 to 100%

Economizer Status

Multi-State

Used to display the status of the economizer, if present. The state of this property is dependent upon the state of the 'Economizer Enable: Active' property.

0 = Closed (disabled)
1 = Open (enabled)
2 = Not Present

Economizer/Ventilation Type

Multi-State

Defines the economizer/ventilation type of the unit.

0 = None
1 = 2-Position Ventilation
2 = Modulation Economizer
3 = 2-Position Ventilation/Waterside Economizer
4 = Waterside Economizer
5 = Airside/Waterside Economizer
6 = TRAQ Damper
7 = Airside Economizer & TRAQ Damper/Sensor
8 = TRAQ Damper/Sensor & Waterside Economizer
9 = Airside Economizer, TRAQ Damper/Sensor &  Waterside Economizer

Electric Heat Run Hours

Numeric

Number of electric heat run hours elapsed since the "Electric Heat Counter" has been cleared. This property only applies to Trane controllers.

Range: 0 to 65535 hours.

Emergency Override: Request

Multi-State

This property is used to override the UCM's Present Value, when an emergency signal dictates the need for the following functions.

0 = Normal
1 = Pressurize
2 = Depressurize
3 = Purge
4 = Shutdown

Emergency Override: Tracer

Multi-State

Used to communicate the emergency override request to the controller.

Note: If Emergency Override: Request is Normal, the communicated request will come from the Present Value. The communicated request will come from Emergency Override: Request if it is anything other than Normal

0 = Normal
1 = Pressurize
2 = Depressurize
3 = Purge
4 = Shutdown

Energy Hold Off: Active

Binary

Used to report the status of the energy hold off in the controller.

0 = Normal
1 = Energy Hold Off Active

Entering Water Temp: Tracer (Name obsoleted in v14)

Numeric

See 'Source Temperature: Tracer'

Entering Water Temperature: Active

Numeric

The local or communicated entering water temperature. When both exist, the communicated value has priority.

Range: 32.00 to 212.00°F (0.00 to 100.00°C)

Entering Water Temperature: Ref (Name obsoleted in v14)

Property Reference

See 'Source Temperature: Ref'

Exhaust Status

Real

This property indicates active status of the binary output controlling the exhaust fan

Range: 0 – 100%

Exhaust/Return Type

Multi-State

Defines the exhaust/return type of the unit.

0 = None
1 = 1-Speed Exhaust Fan
2 = 2-Speed Exhaust Fan
3 = 3-Speed Exhaust Fan
4 = Modulating Inlet Guide Vanes Exhaust Fan
5 = Variable Speed Exhaust Fan
6 = 1-Speed Exhaust Fan w/Modulating Exhaust Damper
7 = 2-Speed Exhaust Fan w/Modulating Exhaust Damper
8 = 3-Speed Exhaust Fan w/Modulating Exhaust Damper
11 = 1-Speed Return Fan
12 = 2-Speed Return Fan
13 = 3-Speed Return Fan
14 = Modulating Inlet Guide Vanes Return Fan
15 = Variable Speed Return Fan
21 = 1-Speed Return Fan With Modulating Exhaust Damper
22 = 2-Speed Return Fan With Modulating Exhaust Damper
23 = 3-Speed Return Fan With Modulating Exhaust Damper
24 = Modulating Inlet Guide Vanes Return Fan With Modulating Exhaust Damper
25 = Variable Speed Return Fan With Modulating Exhaust Damper
26 = 1-Speed Return Fan With Binary Exhaust Damper
27 = 2-Speed Return Fan With Binary Exhaust Damper
28 = 3-Speed Return Fan With Binary Exhaust Damper
29 = Modulating Inlet Guide Vanes Return Fan With Binary Exhaust Damper
30 = Variable Speed Return Fan With Binary Exhaust Damper
31 = 2 Position Exhaust Damper
32 = Modulating Exhaust Damper

External Interface File (XIF)

Text

The logical interface to a device, which contains the Program Interface. A device's external interface specifies the number and types of LonMark objects; the number, types, directions and connection attributes of network variables; and the number of message tags. The program ID field is used as the key to identify each external interface.

Face And Bypass: Active

Numeric

Status of the unit's face and bypass damper.

Range: 0 to 100%

0% = Full Bypass

Fan Speed: Ref

Numeric

This property indicates the value to be used by the BCU to determine which value to communicate to the UCM as the fan speed. The fan being controlled may be a 1, 2, 3, or variable speed fan. This property is valid for non-VAV devices only.

Valid Range: 0 – 100%.

A state of “Not Used” (0xFF) specifies that the associated network variable is in “auto”.

Fan Speed: Tracer

Numeric

Used to communicate the fan speed to the UCM. The fan being controlled may be a 1, 2, 3, or variable speed fan. This property is valid for non-VAV devices only.

Valid Range: 0 – 100%.

A state of 0xFF specifies that the associated network variable is in “auto”.

Flow Gain

Numeric

Indicates the air flow measurement gain.

Range: 0 to 327,675

Flow Setpoint: Active

Numeric

This property indicates the active flow setpoint, if the UCM has a local or communicated flow setpoint value.

Range: 0 – 138,840 CFM (0 to 65,534L/s)

Generic Analog Input

Numeric

The state of generic analog input. This property only applies to Trane controllers.

Range: 0 – 100

Generic Binary Input

Multi-State

The state of generic binary input 1.

0 = Off
1 = On
2 = Not Present

Generic Binary Output

Multi-State

The state of generic binary output 1.

0 = Off
1 = On
2 = Not Present

Generic Binary Output: Tracer

Binary

Used to control the generic binary output. (when present)

0 = Off 1 = On

Generic Temperature

Numeric

Status of the local generic temperature input.

Range: -40.00 to 158.00°F (-40.00 to 70.00°C)

Heat Output

Numeric

Status of the unit's primary heat capacity (if hydronic, reports valve position of primary heat valve).

Range: 0 to 100%

Heat Output Secondary

Numeric

Status of the unit's secondary heat capacity (if hydronic, report valve position of secondary heat valve). For a Trane VAV box this represents the reheat output in the controller (electric or hydronic).

Range: 0 to 100%

Heat Setpoint High Limit

Numeric

The local or communicated occupied heating setpoint high limit If both exist, the communicated value has priority

Range: 40.00 to 115.00°F (44.4 to 46.11°C)

Heat Setpoint Low Limit

Numeric

The local or communicated occupied heating setpoint low limit If both exist, the communicated value has priority

Range: 40.00 to 115.00°F (44.4 to 46.11°C)

Heat Setpoint Occupied

Numeric

This property defines the occupied heating setpoint.

If the controller is a Trane VAV box then this property only affects the operation of the controller if its cabinet style is configured as Space Temperature Controller.

Range: 40.00 to 115.00 deg F (44.4 to 46.11 °C)

Heat Setpoint Occupied Standby

Numeric

This property defines the occupied standby heating setpoint.

If the controller is a Trane VAV box then this property only affects the operation of the controller if its cabinet style is configured as Space Temperature Controller.

Range: 40.00 to 115.00°F (44.4 to 46.11°C)

Heat Setpoint Unoccupied

Numeric

This property defines the unoccupied heating setpoint.

If the controller is a Trane VAV box then this property only affects the operation of the controller if its cabinet style is configured as Space Temperature Controller.

Range: 40.00 to 115.00°F (44.4 to 46.11°C)

Heat Stage Status[1-8]

Multi-State

Indicates if heat stage 1-8 is present or not, and if it is on or off.

0 = Off
1 = On
2 = Not Present

Heat/Cool Mode: Active

Binary

Used to display the current heat/cool mode of the SCC UCM. This is an interpretation made by the BCU based on the value shown for the 'Mode: Heat/Cool' property

Valid Range: 0 = Heating, 1 = Cooling.

Mode: Heat/Cool (Display Text):

0 = Auto (Cooling)
1 = Heat (Heating)
2 = Morning Warm-up (Heating)
3 = Cool (Cooling)
4 = Night Purge (Cooling)

5 = Pre Cool (Cooling)
6 = Off (Heating)
7 = Test (Heating)
8 = Emergency Heat (Heating)
9 = Fan Only (Cooling)
10= Free Cool (Cooling)
11= Ice-Making (Cooling)
12= Max Heat (Heating)
13= Economy Mode (Cooling)
14= Dehumidifying (Cooling)
15= Calibrate (Cooling)
0xFF = Invalid (Heating)
Anything else (Heating)

Heat/Cool Mode: Ref

Property Reference

This property indicates the value to be used by the BCU to determine which value to communicate to the UCM as the heat/cool mode.

Heating Maximum Flow

Numeric

Indicates the heating maximum air flow.

If the controller is a Trane VAV box then this property only affects the operation of the controller if its cabinet style is configured as Space Temperature Controller.

Range: 0 to 138,840 CFM (0 to 65534 L/s)

Heating Minimum Flow

Numeric

Indicates the heating minimum air flow.

If the controller is a Trane VAV box then this property only affects the operation of the controller if its cabinet style is configured as Space Temperature Controller.

Range: 0 to 138,840 CFM (0 to 65534 L/s)

Heating Setpoint Shift: Ref

Property Reference

This property indicates the value to be used by the BCU to shift the occupied and occupied standby heating setpoints. Unoccupied heating setpoints are not shifted.

Range: -18.0 to +18.0 F degrees (-100 to 100°C)

Heating Setpoint Shift: Tracer

Numeric

Used to shift the occupied and occupied standby heating setpoints. Unoccupied heating setpoints are not shifted.

Range: -18.0 to +18.0°F (-10.0 to 10.0°C)

Humidifier: Active

Numeric

Status of unit's humidifier output.

Range: 0-100% 0% = Off

Language Identifier

Multi-State

Defines which language is currently being used. It defines for the UCM what language to present alarm messages in.

0 = English
1 = French
2 = German
3 = Spanish
4 = Portuguese
5 = Dutch
6 = Italian
Note: Only English is supported at this time.

Last Control Date Time

Date/Time Numeric

This indicates the date and time when the present value property of this object was last controlled.

Leaving Water Temperature: Active

Numeric

The local leaving water temperature.

Range: -40.00 to 212.00°F (-40.00 to 100.00°C

Light 1 Command: Local

Binary

Reports how light circuit #1 is being commanded from the zone sensor. This property only applies to Trane controllers (e.g., the ZN523). Valid

Range: 0 = Off 1 = On

Light 1 Command: Tracer

Binary

Used to communicate override commands to light circuit #1. This property can not be read, it only controls an override for light #1. This property only applies to Trane controllers (e.g., the ZN523)

Valid Range:

0 = Off
1 = On
Invalid value = 0xFF

Light 1 Status

Binary

Reports the status of light circuit #1. This property only applies to Trane controllers (e.g., the ZN523).

Valid Range:
0 = Off
1 = On

Light 2 Command: Local

Binary

Reports how light circuit #2 is being commanded from the zone sensor. This property only applies to Trane controllers (e.g., the ZN523).

Valid Range: 0 = Off 1 = On

Light 2 Command: Tracer

Binary

Used to communicate override commands to light circuit #2. This property can not be read, it only controls an override for light #2. This property only applies to Trane controllers (e.g., the ZN523)

Valid Range: 0 = Off 1 = On Invalid value = 0xFF

Light 2 Status

Binary

Reports the status of light circuit #2. This property only applies to Trane controllers (e.g., the ZN523).

Valid Range: 0 = Off 1 = On

Load: Absolute

Numeric

Used by heat pumps to indicate the current energy consumed by the unit.

Range: 0 to 1,865 tons (0 to 6553.4 KW)

Load: Terminal

Numeric

Used by Heat Pumps to indicate the current heat/cool energy demand of the unit.

Range:

-150% = (Screaming for heat)
+150% = (Screaming for Cooling)
-100% = (Heating) to 100% = (Cooling)

Location Label

Text String

Used to provide descriptive location information.

LonTalk Communication State

Numeric

This property indicates the status of communications between the BCU and the SCC. 0 = Down 1 = Up 2 = No neuron ID assigned 3 = Installation in progress 4 = Incomplete bindings

LonTalk Device NID

Bytestring

The Neuron ID (NID) of the UCM. This is a unique, 12 digit, non-adjustable serial number found on every Neuron chip.

LonTalk DSN

Unsignedlongword

A comma-separated value representing the domain, subnet, and node ID (DSN) of the UCM.

LonTalk Program ID

Numeric

An identifier stored in the device (in the Neuron Chip's EEPROM) that identifies the application program running on the node. All nodes with the same program ID must have the same external interface.

Maintenance Requested

Multi-State

This property is used to report whether a service ping has been received by the UCM (e.g a zone sensor initiated a service ping on a ZN523). This property only applies to Trane controllers. Valid Range: 0 = No 1 = Yes 2 = Not Present

Manual Control

Binary

If the UCM supports this property this will indicate if the source of the control parameters used by the device is local (manual). Valid Range: FALSE (0) = device is under building management control (default). TRUE (non-0) = device is under manual control.

Maximum Flow

Numeric

Indicates the maximum air flow.

If the controller is a Trane VAV box then this property only affects the operation of the controller if its cabinet style is configured as Space Temperature Controller.

Range: 0 to 138,840 CFM (0 to 65534 L/s)

Minimum Flow

Numeric

Indicates the minimum air flow.

If the controller is a Trane VAV box then this property only affects the operation of the controller if its cabinet style is configured as Space Temperature Controller.

Range: 0 to 138,840 CFM (0 to 65534 L/s)

Minimum Off Time

Numeric

This property provides access to the minimum off time assigned to the UCM being represented. This value serves to protect the hardware from cycle times that might harm the hardware.

Minimum On Time

Numeric

This property provides access to the minimum on time assigned to the UCM being represented. This value serves to protect the hardware from cycle times that might harm the hardware.

Minimum Send Time

Numeric

This defines the minimum period of time between automatic network variable output transmissions. Although this configuration property is optional, it must be provided if the minimum send time function is used in the controller. Setting this property to 0.0 disables the Minimum Send Time mechanism.

Valid Range: 0.0 sec to 6,553.4 sec.

Minimum Time Remaining

Numeric

This property provides access to the minimum time remaining (if any) of a minimum On/Off time control action for the represented UCM device. PUTS are also allowed so that an operator can intervene on a Minimum On/Off control action that is in progress.

Mixed Air Temperature

NUMERIC

Controller property that displays the unit's current mixed air temperature.

Typical Range: 4.0 to 122.0 deg. F (-20.00 to 50.00 deg C).

Invalid: 327.67

Mode: Active

Multi-State

Actual mode of the unit.

Valid Range:

1 = Heat
2 = Morning Warm-up
3 = Cool
4 = Night Purge
5 = Pre Cool
6 = Off
7 = Test
8 = Emergency Heat
9 = Fan Only
10= Free Cool
11= Ice-Making
12= Max Heat
13= Economy Mode
14= Dehumidifying
15= Calibrate

Mode: Heat/Cool

Multi-State

Actual heat/cool mode of the unit.

Valid Range:

1 = Heat
2 = Morning Warm-up
3 = Cool
4 = Night Purge
5 = Pre Cool
6 = Off
7 = Test
8 = Emergency Heat
9 = Fan Only
10= Free Cool
11= Ice-Making
12= Max Heat
13= Economy Mode
14= Dehumidifying
15= Calibrate

Mode: Occupancy

Multi-State

The local or communicated occupancy status When both exist, the communicated value. has priority

0 = Occupied
1 = Unoccupied
2 = Occupied Bypass
3 = Occupied Standby

Node Self Doc

Text String

This property displays the unit's type of UCM (i.e. ZN510, MP580, VV550, etc.).

Node Status

Multi-State

The current operating condition of the Neuron Microprocessor. Possible conditions are:

Normal Unconfigured Unconfigured/No application Configured/Online Configured/Offline (soft) Configured/Offline (hard) Configured/Offline (bypass) Unsupported

Nominal Flow

Numeric

Indicates the nominal air flow. Range: 0 to 138,840 CFM (0 to 65534 L/s)

Object Identifier

Object ID

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

Object Name

Text String

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

Object Type

Multi-State

This property Designates the object's type (i.e. analog input, binary input, TCM, PCM, etc).

Occupancy: Active

Binary

Used to display the current occupancy of the SCC UCM based on the multi-state values of the 'Mode: Occupancy' property (nvoEffectOccup from the UCM).

Valid Range:

0 = Unoccupied,
non-0 = Occupied

Occupancy: Tracer

Enumerated

This property indicates the value that is communicated by the system to the UCM and used to determine occupancy.

If the controller is a Trane VAV box then this property only affects the operation of the controller if its cabinet style is configured as Space Temperature Controller or Ventilation Flow Controller.

0=Unoccupied
1=Occupied
3=Occupied Standby

Occupant Call: Local

Multi-State

This property is used to report whether an occupant call has been received at the UCM (e.g. a ZN523) from a zone sensor. This property only applies to Trane controllers. Valid Range: 0 = No 1 = Yes 2 = Not Present

Occupied Bypass Time

Numeric

Defines the maximum amount of time that the unit can be in Bypass (occupancy) mode from a single Bypass request from a local (hardwired) switch. This property only applies to a local input, if present.

If the controller is a Trane VAV box then this property only affects the operation of the controller if its cabinet style is configured as Space Temperature Controller.

Range: 0 to 240 minute

Occupied Bypass: Active

Binary

Used to display the current occupied status of the SCC UCM based on the multi-state values of the 'Mode: Occupancy' property (nvoEffectOccup from the UCM).

Valid Range:

0 = not in Occupied Bypass
non-0 = Occupied Bypass

Outdoor Air Damper Position

Numeric

This property indicates the active position of the outdoor air damper (if the unit is configured for one). If the outdoor air damper is a modulating air damper, the valid range is between 0 and 100%. If it is a 2-position outdoor air damper, the value that appears will be either 0 or 100% (closed or open).

Outdoor Air Enthalpy

Numeric

The local or communicated outdoor air enthalpy. When both exist, the communicated value has priority.

Typical Range: 8.60 to 42.99 BTU/lb (20 to 100 KJoules/Kg).

Outdoor Air Humidity: Input

Numeric

This property indicates the outdoor air relative humidity in a percentage, if the UCM has a locally wired humidity sensor.

Range: 0% to 100%

Outdoor Air Humidity: Ref

Property Reference

This property indicates the value to be used by the BCU to determine which value to communicate as the Outdoor Air Humidity Input.

Range: 0% to 100%

Outdoor Air Humidity: Tracer

Numeric

Used to communicate outdoor air humidity to the controller. Communicated value used over local value when both are present. Range: 0% to 100%

Outdoor Air Temp Setpoint: Local

Numeric

Defines the outside air temperature at which the device is allowed to economize. This is the absolute temperature, not a differential temp or enthalpy value. Valid Range: 32 – 100 degF (0.00 – 37.78 degC)

Outdoor Air Temperature: Active

Float

The local or communicated outdoor air temperature. When both exist, the communicated value has priority. Valid Range: -40.00 to 158.00 deg. F (-40.00 to 70.00 deg. .C)

Outdoor Air Temperature: Ref

Property Reference

This property indicates the value to be used by the BCU to determine which value to communicate to the UCM as the Outdoor Air Temperature.

Outdoor Air Temperature: Tracer

Numeric

This property indicates the value that is communicated by the system to the UCM and used as the Outdoor Air Temperature.

Range = -40 to 158 degrees F (-40 to 70 degrees C)

Preheat Type

Multi-State

Defines the preheat type of the unit.

0 = None
1 = Modulating Hot Water
2 = Binary Hot Water
3 = Modulating Steam Water
4 = Binary Steam Water
5 = Modulating Electric
6 = 1 Stage Electric
7 = 2 Stage Electric
8 = 3 Stage Electric
9 = 4 Stage Electric
10 = Pump And Valve
11 = 1 Stage Gas
12 = 2 Stage Gas
13 = Modulating Gas
14 = 2 Pipe Changeover Modulating
15 = 2 Pipe Changeover Binary
16 = Hot Gas Bypass
17 = Modulating Air
18 = 1 Stage DX
19 = 2 Stage DX
20 = 3 Stage DX
21 = 4 Stage DX
22 = Wild Coil
23 = Face Bypass Wild Hot Water
24 = Face Bypass Wild Steam
25 = Face Bypass Modulating Hot Water
26 = Face Bypass Modulating Steam
27 = Face Bypass Binary Hot Water
28 = Face Bypass Binary Steam

Present Value

Op Mode

This property is used to control the unit to one of nine standard operation modes. These modes are defined as UNOCCUPIED, OPTIMAL START, OCCUPIED, OPTIMAL STOP, DEMAND LIMIT, DUTY CYCLE, PRIORITY SHUTDOWN, NIGHT ECONOMIZE, and NIGHT HEAT- COOL. A translation (within the BCU) may take place to map these modes into a simpler mode set.

Reheat Type

Multi-State

Defines the reheat type of the unit.

0 = None
1 = Modulating Hot Water
2 = Binary Hot Water
3 = Modulating Steam Water
4 = Binary Steam Water
5 = Modulating Electric
6 = 1 Stage Electric
7 = 2 Stage Electric
8 = 3 Stage Electric
9 = 4 Stage Electric
10 = Pump And Valve
11 = 1 Stage Gas
12 = 2 Stage Gas
13 = Modulating Gas
14 = 2 Pipe Changeover Modulating
15 = 2 Pipe Changeover Binary
16 = Hot Gas Bypass
17 = Modulating Air
18 = 1 Stage DX
19 = 2 Stage DX
20 = 3 Stage DX
21 = 4 Stage DX
22 = Wild Coil
23 = Face Bypass Wild Hot Water
24 = Face Bypass Wild Steam
25 = Face Bypass Modulating Hot Water
26 = Face Bypass Modulating Steam
27 = Face Bypass Binary Hot Water
28 = Face Bypass Binary Steam

Release Overrides: Tracer

Multi-State

Used to release one or more overrides. This property only applies to Trane controllers (e.g., the ZN523).

Valid values for this property:

0 = Temperature Setpoint Release
1 = Fan Speed Command Release
2 = Occupant Call Release
3 = Release All Overrides

Reset Electric Heat Timer

Binary

Used to reset the electric heat timer in the UCM (e.g., the ZN523).

Valid Range:

0 = Off
non-0 = Reset Timer

Reset Maintenance Timer

Binary

Used to reset the maintenance timer in the SCC UCM.

0 = Off
1 = Reset Timer

Return Air Temperature

Numeric

The return air temperature.

Valid Range: -40.00 to 212.00 deg. F (-40.00 to 100.00 deg. C).

Reversing Valve

Binary

This property indicates the active status of the reversing valve (applies to Water Source Heat Pumps only).

0=Off/Heat
1=On/Cool

Saturated Condenser Temperature

Float

The active condenser temperature reported from the UCM.

Setpoint Offset: Ref

Property Reference

This property indicates the value to be used by the BCU to determine which value to communicate as the Setpoint Offset.

Setpoint Offset: Tracer

Numeric

Used to shift the occupied and standby temperature setpoint. All setpoints will be shifted up or down by this value.

Source Temperature: Ref (Formerly called 'Entering Water Temperature: Ref')

Property Reference

This property indicates the value to be used by the BCU to determine which value to communicate as the Entering Water Temperature Input for a non-VAV controller or as the Supply Air Temperature Input for a VAV controller.

Valid Range: 32.00 to 212.00 deg. F (0.00 to 100.00 deg. C).

Source Temperature: Tracer (Formerly called 'Entering Water Temperature: Tracer')

Numeric

Used to communicate the entering water temperature to a non-VAV controller or the supply air temperature to a VAV controller. The communicated value is used over the local value when both are present.

Valid Range: 32.00 to 212.00 deg. F (0 to 100 C)

Space CO2 Concentration: Input

Numeric

This property indicates the space carbon dioxide (CO2) concentration in parts per million (ppm), if the UCM has a locally wired CO2 sensor.

If the controller is a Trane VAV box then this property only affects the operation of the controller if its cabinet style is configured as Space Temperature Controller or Ventilation Flow Controller.

Range: 0 to 5000 ppm

Space CO2 Concentration: Ref

Numeric

This property indicates the value to be used by the BCU to determine which value to communicate to the UCM as the Space CO2 reading. The communicated value will take precedence over a locally hard-wired sensor.

Space CO2 Concentration: Tracer

Numeric

If used, this is the value that will be communicated down to the UCM and used as its Space CO2 reading. The communicated value will take precedence over a locally hard-wired sensor.

Space CO2 Limit

Numeric

This defines a high limit CO2 setpoint for the controlled space. Typical Range: 300 to 3000 ppm. A value of 0 ppm will disable the CO2 Limit functions in the controller.

If the controller is a Trane VAV box then this property only affects the operation of the controller if its cabinet style is configured as Space Temperature Controller or Ventilation Flow Controller.

Default Value: 0 (no limit functions)

Space CO2 Low Limit

Numeric

This defines a high limit CO2 setpoint for the controlled space. Typical Range: 0 to 2000 ppm. A value of 0 ppm will disable the CO2 Limit functions in the controller.

If the controller is a Trane VAV box then this property only affects the operation of the controller if its cabinet style is configured as Space Temperature Controller or Ventilation Flow Controller.

Default Value: 0 (no limit functions)

Space Dehumidification Setpoint: Local

Numeric

This defines a high limit humidity setpoint for the controlled space.

Typical Range: 40 to 100%. A value of 0% will disable the dehumidification functions in the controller.

Default Value: 0% (no dehumidification functions)

Space Humidity: Input

Numeric

This property indicates the space relative humidity in a percentage, if the UCM has a locally wired humidity sensor.

Range: 0% to 100%

Space Pressure: Active

Float

The local or communicated effective space pressure. When both exist, the communicated value has priority.

Typical Range: -1.00 to 1.00 I.W.C. (-250 to 250 Pa).

Space Setpoint User

Numeric

This is a graphical setpoint field that applies during the occupied and occupied standby mode. It is the space setpoint that the user intends to send down to the UCM as the active setpoint. An algorithm uses the heat/cool mode and occupancy mode of the UCM to determine the necessary 'Space Temperature Setpoint: Ref' value that will equate the users entered value to the 'Space Temperature Setpoint: Active' property in the UCM. The algorithm is based on the asymmetrical method for determining the active setpoint relative to the communicated space setpoint value. The valid range entered in this field will vary depending on the default heating/cooling setpoints, setpoint offset, and setpoint shift parameters, but is such that it will not cause the 'Space Temperature Setpoint: Ref' value to go out of range.

Space Temperature: Active

Numeric

The local or communicated effective space temperature. When both exist, the communicated value has priority. If neither exist, the unit uses its stored default.

If the controller is a Trane VAV box then this property only affects the operation of the controller if its cabinet style is configured as Space Temperature Controller or Ventilation Flow Controller.

Typical Range: 14.00 to 122.00°F (-10 to 50°C)

Space Temperature: Ref

Property Reference

This property indicates the value to be used by the BCU to determine which value to communicate as the Space Temperature.

Range: 14.00 to 122.00°F (-10 to 50°C)

Space Temperature: Tracer

 Numeric

Used to communicate a space temperature to the controller. Communicated value used over local value when both are present.

Range: 14 to 122°F (-10 to 50°C)

Space Temperature Setpoint Control: Local

Binary

Defines whether the local hardwired setpoint input is enabled or disabled.

0=Disabled
1=Enabled

Space Temperature Setpoint: Active

Numeric

The local or communicated effective space temperature setpoint. When both exist, the communicated value has priority. If neither exists, the unit uses its stored default value. If the controller is a Trane VAV box then this property only affects the operation of the controller if its cabinet style is configured as Space Temperature Controller.

Range: 50.00 to 95.00°F (10.00 to 35.00°C)

Space Temperature Setpoint: Local

Numeric

Reflects the local setpoint input.

Space Temperature Setpoint: Ref

Property Reference

This property indicates the value to be used by the BCU to determine which value to communicate as the Space Temperature Setpoint.

Range: 50.00 to 95.00°F (10.00 to 35.00°C)

Space Temperature Setpoint: Tracer

Numeric

Used to communicate a space temperature setpoint to the controller. Communicated value used over local value when both are present. Range: 50.00 to 95.00°F (10.00 to 35.00°C)

Standby Minimum Flow

Numeric

Indicates the standby minimum air flow.

If the controller is a Trane VAV box then this property only affects the operation of the controller if its cabinet style is configured as Space Temperature Controller.

Range: 0 to 138,840 CFM (0 to 65534 L/s)

Startup Setpoint

Numeric

This property defines the threshold for warm-up or pre-cool at start-up.

Startup Time Delay

Unsigned Word

Represents the amount of time the controller waits (after power-up) before invoking the normal control algorithm operation. Range: 0 to 6553.5 s

Sunblind 1 Command: Local

Binary

Reports how sunblind circuit #1 is being commanded from the zone sensor. This property only applies to Trane controllers (e.g. the ZN523).

Valid Range:
0 = Closed
1 = Open

Sunblind 1 Command: Tracer

Binary

Used to communicate override commands to sunblind circuit #1. This property can not be read, it only controls an override for sunblind #1. This property only applies to Trane controllers (e.g., the ZN523).

Valid Range:

0 = Close
1 = Open

Sunblind 1 Status

Binary

Reports the status of sunblind circuit #1. This property only applies to Trane controllers (e.g., the ZN523).

Valid Range:

0 = Closed
1 = Open

Sunblind 2 Command: Local

Binary

Reports how sunblind circuit #2 is being commanded from the zone sensor. This property only applies to Trane controllers (e.g. the ZN523).

Valid Range:

0 = Closed
1 = Open

Sunblind 2 Command: Tracer

Binary

Used to communicate override commands to sunblind circuit #2. This property can not be read, it only controls an override for sunblind #2. This property only applies to Trane controllers (e.g., the ZN523).

Valid Range:

0 = Close
1 = Open

Sunblind 2 Status

Binary

Reports the status of sunblind circuit #2. This property only applies to Trane controllers (e.g., the ZN523).

Valid Range:

0 = Closed
1 = Open

Supply Fan Proving Status

Enumerated

Status that indicates if the supply fan is actually on, compared to the Supply Fan Status property, which may indicate only a requested state. Example of proving actual operation is by means of a current sensing relay on the wires to the fan motor.

0 = Off
1 = On
2 = Not Present.

Supply Fan Run Time

Numeric

Number of fan run hours elapsed since the "maintenance required" diagnostic was initiated and cleared.

Range: 0 to 65535 h

Supply Fan Speed

Enumerated

Status of unit's fan output as an enumeration.

Valid Range:

Percent = Enum = Display Text

0% = 0 = Off
1 – 65% = 1 = On/Low
66 – 99% = 2 = On/Medium
100% = 3 = On/High
all other = 0xFF = NA

Supply Fan Status

Numeric

Status of unit's fans output.

Range: 0 – 100%
0% = Off
1 - 99% = On at some non-high speed
100% = On high

Supply Fan Switch Control: Local

Binary

Defines whether the local hardwired setpoint input is enabled or disabled.

0=Disabled
1=Enabled

Supply Fan Type

Multi-State

Defines the supply fan type of the unit

0 = None
1 = 1 Speed Supply Fan
2 = 2 Speed Supply Fan
3 = 3 Speed Supply Fan
4 = Modulating Inlet Guide Vanes Supply Fan
5 = Variable Speed Supply Fan
11 = 1 Speed VAV Series Fan
12 = 2 Speed VAV Series Fan
13 = 3 Speed VAV Series Fan
14 = Modulating Inlet Guide Vanes VAV Series Fan
15 = Variable Speed VAV Series Fan
21 = 1 Speed VAV Parallel Fan
22 = 2 Speed VAV Parallel Fan
23 = 3 Speed VAV Parallel Fan
24 = Modulating Inlet Guide Vanes VAV Parallel Fan
25 = Variable Speed VAV Parallel Fan

Timed Override Request

Binary

This property indicates the active status of the Timed Override Flag, which is set, when the Timed Override button is pushed on the zone sensor.

0=No (not pressed)
1=Yes (pressed)

Timed Override Request: Cancel

Binary

This property indicates the active status of the Cancel Timed Override Flag that is set when the cancel button is pushed on the zone sensor.

0=No (not pressed)
1=Yes (pressed)

Update Tag

Numeric

This property is used as the upload/download tag. Its purpose is to keep the PC Workstation and BCU copies of the object instance in synchronization

VAV Drive Max Heat: Ref

Property Reference

This property indicates the value to be used by the BCU to communicate Max Heat override commands for the Application Mode.

0 = Auto
1 = Drive max heat

Ventilation Ratio Calc

Float

This status property is the ratio between the “Ventilation Setpoint: Active” property and the “Airflow: Active” property. This value is limited by the “Ventilation Ratio Limit: Tracer” property.

This property only applies to a Trane VAV box with its cabinet style configured as Space Temperature Controller or Ventilation Flow Controller.

Valid Range: 0 – 100%

Ventilation Ratio Limit: Tracer

Float

This property is communicated to the VAV as the limit to request outdoor air in the primary air (VAV system).

This property only applies to a Trane VAV box with its cabinet style configured as Space Temperature Controller or Ventilation Flow Controller.

Valid Range: 1 – 100%

Ventilation Setpoint: Active

Float

This property is the amount of outdoor air the VAV is requesting. The VAV will typically use this in determining the “Ventilation Ratio Calc” property.

This property only applies to a Trane VAV box with its cabinet style configured as Space Temperature Controller or Ventilation Flow Controller.

Valid Range: 0 – 65,534 L/s

Ventilation Setpoint: Max

Float

This property is the maximum flow of outdoor air the space should ever require for ventilation purposes. This property only applies to a Trane VAV box with its cabinet style configured as Space Temperature Controller or Ventilation Flow Controller.

Valid Range: 0 – 10,000 L/s (0 – 21,189 cfm)

Ventilation Setpoint: Min

Float

This property is the minimum flow of outdoor air required to ventilate the space during periods of zero occupancy. This property only applies to a Trane VAV box with its cabinet style configured as Space Temperature Controller or Ventilation Flow Controller.

Valid Range: 0 – 10,000 L/s (0 – 21,189 cfm)

Ventilation Setpoint: Ref

Float

This property is communicated to the VAV as the ventilation setpoint (the outdoor air requirement) for the expected number of people occupying the space.

This property only applies to a Trane VAV box with its cabinet style configured as Space Temperature Controller or Ventilation Flow Controller.

Valid Range: 0 – 10,000 L/s (0 – 21,189 cfm)

Ventilation Setpoint: Tracer

Float

This property is communicated to the VAV as the ventilation setpoint (the outdoor air requirement) for the expected number of people occupying the space.

This property only applies to a Trane VAV box with its cabinet style configured as Space Temperature Controller or Ventilation Flow Controller.

Valid Range: 0 – 10,000 L/s (0 – 21,189 cfm)

Water Valve Drive Closed: Ref

Property Reference

This property only applies to sites that use a v14.XXX BCU image or older.

This property indicates the value to be used by the BCU to communicate override commands for the Water Valve Override. 0 = Auto 1 = Close all valves

Water Valve Drive Open: Ref

Property Reference

This property only applies to sites that use a v14.XXX BCU image or older.

This property indicates the value to be used by the BCU to communicate override commands for the Water Valve Override. 0 = Auto 1 = Open all valves

Water Valve Override: Tracer

Multi-State

Used to communicate override commands for the Water Valve(s). In Tracer Summit version 15 and newer this property can not be read, it only initiates a water valve override.

If the controller is a Trane VAV box then this property only affects the operation of the controller if its cabinet style is configured as Space Temperature Controller or Ventilation Flow Controller.

Valid Range: 0 = Normal
4 = Open all valves
5 = Close all valves
All other values = Not Used