Discharge Air Controller (DAC)

Property

Type

Description

Active Circuit[1-8]

Binary

Active Circuit. Each bit reflects the state of up to eight circuits
0 = Inactive (or not present)
1 = Active

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 Level

Enumerated

Indicates the severity of the diagnostic shown in the "Diagnostic Alarm Status" property.
0 = Normal
1 = Informational Message
2 = Service Required
3 = Critical Alarm
255 = Unknown

Alarm Present

Binary

Controller property that indicates that a diagnostic condition exists within the unit.
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=Clear alarm request is supported
1=Clear alarm request is not supported

Application Mode: Tracer 

Multi-State

Used to communicate the application mode of the unit. Valid Range:

0 = Auto
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

Cabinet Style

Multi-State

Controller property that defines the cabinet style based on the Unit Type.
Example:  For one of the cabinet styles for a Rooftop unit type is "Voyager Commercial."

Cluster Member Role

Multi-State

Indicates the current cluster configuration of a Trane controller.
0 = Not Clustered
1 = Slave
2 = Master

Comm5 Communication State

Numeric

Obsolete name as of v16SP2. Refer to LonTalk Communication State 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

Building control property that is used to propagate an immediate and latched compressor disable to the controller. A Disable causes a disable to be put to Compressor Control: Tracer and sets a VM-based value to Disable. An Auto only causes the VM-based value to be set to Auto. Valid Range: 0 = Disable, 1 = Auto.

Condenser Capacity: Active

Numeric

Indicates the active condenser capacity. 
Valid range: 0% = Off, 100% = Full

Condenser Water Flow Status

Binary

Controller property that displays the effective, local or communicated, condenser water flow.
0 = no flow
non-0 = Flow

Condenser Water Flow: Ref

Property Reference
(Binary)

Building control property selects system water flow state that is communicated down to the unit as the condenser water flow.
0 = no flow
non-0 = Flow
Not Used = Null = Unit determines locally if flow is present

Condenser Water Flow: Tracer

Enumeration

Building control property used to communicate the building condenser water flow to the controller.
0 = No Flow
1 = Flow
2 = Auto/Invalid.

Condenser Water Pump Output

Binary

Controller property that displays the unit’s hardwired condenser water pump status.
0 = Off,
non-0 = On

Condenser Water Temp: Active

Numeric

Indicates the active condenser water temperature.  In an Intellipak RTU, this is the condenser sump water temperature.  In an Intellipak CSC this is the entering water condenser temperature.
Typical Range: 14.0 to 122.0 deg. F 
(-10.00 to 50.00 deg C). 
Invalid or Property Not Supported 327.67

Condenser Water Temp: Entering

Numeric

Controller property which displays the unit's local temperature of the water entering the condenser.

Condenser Water Temp: Leaving

Numeric

Controller property which display the unit’s local temperature of the water leaving the condenser.

Condenser Water Temp: Local

Numeric

Indicates the unit’s hardwired condenser water temperature.
Typical Range: 14.0 to 122.0 deg. F 
(-10.00 to 50.00 deg C). 
Invalid or Property Not Supported = 327.67

Condenser Water Temp: Ref

Property Reference
(Numeric)

Building control property selects condenser water temperature that is communicated down to the unit as the condenser water temp.
14.0 to 122.0 deg. F (-10.00 to 50.00 deg C). Invalid = 327.67

Condenser Water Temp: Tracer

Numeric

Building Control property that is used to communicate the building condenser water temp to the controller.
14.0 to 122.0 deg. F (-10.00 to 50.00 deg C). Invalid = 327.67

Config: Condenser Type

Multi-State

Controller property that displays condenser type.
Valid range:
0=none
1=air-cooled condenser
2=water-cooled condenser

Configuration: Unit Type Trane

Multi-State

Controller property that displays unit type configuration. This property only available in Trane products only.
0 = 1 Heat/1 Cool
1 = Heat Pump
2 = Blower Coil
3 = Unit Ventilator
4 = Fan Coil
5 = Rooftop
6 = Air Handling Unit
15 = 0xF = Unsupported

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).
0 to 100% (0% = Disabled and 100% = Fully enabled)

Cool Setpoint Occupied

Numeric

Controller property which selects the unit’s occupied cooling space setpoint.
Valid Range: 40.00 to 115.00 deg. F 
(4.44 to 46.11 deg. C).

Cool Setpoint Occupied Standby

Numeric

Controller property that selects the units occupied standby cooling space setpoint.
Valid Range: 40.00 to 115.00 deg. F 
(4.44 to 46.11 deg. C).

Cool Setpoint Unoccupied

Numeric

Controller property that selects the unit’s unoccupied cooling space setpoint.
Valid Range: 40.00 to 115.00 deg. F 
(4.44 to 46.11 deg. C). 

Cool Stage Status[1-8]

Multi-State

Controller property that indicates the presence and state of the unit’s cool stage.
0 = Off
1 = On
2 = Not Present

Cool Type

Multi-State

Controller property that displays the unit’s cooling type configuration.
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 Control: Ref

Property Reference
(Numeric)

Building control property that selects the allowable cooling capacity the controller may use.
0 to 100% (0% = Disabled and 100% = Fully Enabled)

Cooling Control: Tracer

Numeric

Building control property that is used to communicate the compressor enable input to the controller.
0 to 100% (0% = Disabled and 100% = Fully Enabled)

Cooling Disable: Ref

Property Reference
(Binary)

Building control Binary property is used to enable or disable the unit’s cooling control.
0 = Auto/Enable
1 = Disable all stages

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 alarm may vary for each UCM.
0 = Disabled (default)
1 = Enabled

Daytime Warmup Setpoint

Numeric

Controller property that selects the daytime warm-up initiate temperature. This applies for units that support daytime warm-up. During occupied mode and when the space temperature falls below this temperature, the unit will change into a daytime warm-up (heating) mode until the space temperature goes above the Daytime Terminate temperature. There should be a three-degree Fahrenheit temperature difference between the Daytime Warmup Setpoint and Daytime Warmup Terminate. A value of 40 deg F can be used to disable daytime warm-up.
40.0 to 87.0 deg F. (4.44 to 30.5 deg C). Default value: 67.0 deg F (19.44 deg C).

Daytime Warm-up Terminate

Numeric

Controller property that selects the daytime warm-up terminate temperature
Refer to Daytime Warmup Setpoint description.
43.0 to 90.0 deg F. (6.00 to 32.00 deg C). Default value: 21.67 deg F. ( 71.00 deg C).

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: Ref

Property Reference

This property indicates the value to be used by the BCU to determine which value to communicate to the UCM to enable the dehumidification function.

Dehumidification Control Status

Multi-State

 Indicates if dehumidification is present or not and if it is on or off. Valid Range:
0 = Off
1 = On
2 = Not Present

Dehumidification Control: Tracer

Multi-State

Building control property used to communicate the enable/disable dehumidification function to the controller. Valid Range: Enable, Disable, Not Used (0xFF = Enable)

Dehumidification Level

Numeric

Indicates the current level of dehumidification control. Valid Range: 0-100%

Dehumidification Start Setpoint:  Tracer

Numeric

Used to communicate the space dehumidification setpoint to the controller.  When valid, this has priority over any other space dehumidification setpoint.
Valid Range:  0 - 100%

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 of the controller as they occur. The severity of the diagnostic is indicated in the "Alarm Level" property.

Discharge Air Cooling Setpoint: Local

Numeric

Controller property that displays the units locally stored default discharge air temperature cooling setpoint.
Typical Range: 32.0 to 86.0 deg. F 
(0.00 to 30.00 deg C).

Discharge Air Cooling Setpoint: Ref

Property Reference
(Numeric)

Building control property defines the discharge air cooling setpoint that is communicated down to the unit as the discharge air temp cooling setpoint.
Range: 32.0 to 86.0 deg. F
(0.00 to 30.00 deg C).
Not Used or Invalid = 327.67

Discharge Air Cooling Setpoint: Reset

Binary

This read-only configuration property indicates the default discharge air cooling setpoint reset control. Valid Range:
0 = Disabled
1 = Enabled

Discharge Air Cooling Setpoint: Tracer

Numeric

Building control property that communicates the discharge air temp cooling setpoint to the controller.
Range: 32.0 to 86.0 deg. F 
(0.00 to 30.00 deg C).
Invalid or Property Not Supported = 327.67

Discharge Air Dew Pt Setpoint: Active

Numeric

Controller property that displays the is effective, local or communicated, discharge air temp dew point setpoint that the unit is using in it’s control. A communicated value has priority over the local value.
Typical Range: -4.0 to 95.0 deg. F 
(-20.00 to 35.00 deg C). 
Invalid or Property Not Supported = 327.67

Discharge Air Dew Pt Setpoint: Local

Numeric

Controller property that displays the units locally stored default discharge air dew point setpoint.
Typical Range: -4.0 to 95.0 deg. F 
(-20.00 to 35.00 deg C).

Discharge Air Dew Pt Setpoint: Ref

Property Reference
(Numeric)

Building control property defines dew point setpoint that is communicated down to the unit as the discharge air temperature dew point setpoint.
Range: -4.0 to 95.0 deg. F 
(-20.00 to 35.00 deg C). 
Not Used or Invalid = 327.67

Discharge Air Dew Pt Setpoint: Tracer

Numeric

Building control property that communicates the discharge air temp dew point setpoint to the controller.
Range: -4.0 to 95.0 deg. F
(-20.00 to 35.00 deg C).
Invalid or Property Not Supported = 327.67

Discharge Air Dew Pt: Active

Numeric

Controller property that displays the effective, local or communicated, discharge air temp dew point. The building controls communicated value has priority over the unit’s local value.
Typical Range: -4.0 to 95.0 deg. F
(-20.00 to 35.00 deg C).
Invalid or Property Not Supported = 327.67

Discharge Air Heating Setpoint: Local

Numeric

Controller property that displays the units locally stored default discharge air heating setpoint.
Typical Range: 40.0 to 180.0 deg. F
(4.00 to 85.00 deg C).

Discharge Air Heating Setpoint: Ref

Property Reference
(Numeric)

Building control property defines the discharge air heating setpoint that is communicated down to the unit as the discharge air temp heating setpoint.
Range: 40.0 to 180.0 deg. F 
(4.00 to 85.00 deg C).
Invalid or Property Not Supported = 327.67

Discharge Air Heating Setpoint: Reset

Binary

This read-only configuration property indicates the default discharge air heating setpoint reset control. Valid Range:
0 = Disabled
1 = Enabled

Discharge Air Heating Setpoint: Tracer

Numeric

Building control property that communicate the discharge air temp heating setpoint to the controller.
Range: 40.0 to 180.0 deg. F 
(4.00 to 85.00 deg C).
Invalid or Property Not Supported = 327.67.

Discharge Air Reheat Setpoint:  Active

Numeric

Indicates the active discharge air temp reheat setpoint in the controller.
Typical Range:  48.0 to 120.0 deg. F (8.89 to 48.89 deg C).

Discharge Air Reheat Setpoint: Ref

Property Reference

This property indicates the value to be used by the BCU to determine which discharge air temp reheat setpoint value to communicate to the UCM.

Discharge Air Heating Setpoint Reset

Binary

This read-only configuration property indicates the default discharge air heating setpoint reset control. Valid Range:
0 = Disabled
1 = Enabled

Discharge Air Reheat Setpoint:  Tracer

Numeric

Used to communicate the discharge air temp reheat setpoint in the controller.
Typical Range:
48.0 to 120.0 deg. F (8.89 to 48.89 deg C).

Discharge Air Temp

Numeric

Controller property that displays the status of the hardwired sensor on the unit.
Typical Range:
32.0 to 212.0 deg. F (0.00 to 100.00 deg. C).

Discharge Air Temp Setpoint: Active

Numeric

Controller property that displays the effective, local or communicated, discharge air temp setpoint for the active heating/cooling mode that the unit is using in it’s control. A communicated value has priority over the local value.
Typical Range:
32.0 to 212.0 deg. F (0.00 to 100.00 deg C).
Invalid or Property Not Supported = 327.67

Duct Pressure: Active

Numeric

Controller property that displays the effective, local or communicated, duct pressure that the unit is using in it’s control. A communicated value has priority over the local value.
Typical Range: 0 to 10.04 I.W.C. (0 to 2500 Pa), 32,767 = Invalid or Property Not Supported.

Duct Pressure: Local

Numeric

Controller property that displays the hardwired duct pressure.
Typical Range:
0.00 to 10.04 I.W.C. (0 to 2500 Pa), 32,767 = Invalid.

Duct Pressure Setpoint: Active

Numeric

Controller property that displays the effective, local or communicated, duct pressure setpoint that the unit is using in it’s control. A communicated value has priority over the local value.
Typical Range: 0.00 to 10.04 I.W.C. (0 to 2500 Pa), 32,767 = Invalid or Property Not Supported.

Duct Pressure Setpoint: Local

Numeric

Controller property that displays the unit’s default duct pressure setpoint.
Typical Range:
0 to 10.04 I.W.C. (0 to 2500 Pa)

Duct Pressure Setpoint: Ref

Property Reference
(Numeric)

Building control property defines the duct static pressure setpoint that is communicated down to the unit as the duct static setpoint.
Range: 0 to 10.04 I.W.C. (0 to 2500 Pa)

Duct Pressure Setpoint: Tracer

Numeric

Building control property that communicates the effective duct pressure setpoint to the controller.
0 to 10.04 I.W.C. (0 to 2500 Pa).

Duct Pressure: Tracer

Numeric

Building control property used to communicate a duct static pressure value. Valid Range: 0-7.9 I.W.C (0-1967 Pa). Invalid: 0x7FFF

Economizer Control: Ref

Property Reference

Building control property defines the economizer control state that is communicated down to the unit as the Economizer Enable Input.
0 = Disabled
1 = Enabled
2 = Auto

Economizer Control: Tracer

Multi-State

Building control that communicates the auto/enable/disable economizer operation to the controller.
0 = Disabled
1 = Enabled
2 = Auto.

Economizer Damper Position

Numeric

Controller property that displays the status of unit's economizer damper pos. (Not used if unit has 2-position OA damper)
Valid Range: 0-100% 

Economizer Enable: Active

Multi-State

Controller property that displays the displays the unit's current state of economizer control algorithm operation.
0 = Disabled
1 = Enabled
2 = Not Present

Economizer Min Position: Ref

Property
Reference

Building control property defines the minimum position for the economizer that is communicated down to the unit as the Economizer Minimum Position Input.
Range: 0 to 100 %

Economizer Min Position: Tracer

Numeric

Building control property that communicates the economizer minimum position to the controller. The communicated value is used over the default value when both are present.
Range: 0 to 100 %

Economizer Minimum Position Occupied

Numeric

Controller property that displays the unit’s default outdoor air damper occupied minimum position.
Valid Range: 0 to 100%

Economizer Minimum Position Occupied Standby

Numeric

Controller property that displays the unit’s default outdoor air damper occupied standby minimum position.
Valid Range: 0 to 100%

Economizer/Ventilation Type

Multi-State

Controller property that displays the economizer/ventilation configuration.
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 and TRAQ Damper/Sensor
8 = Waterside Economizer and TRAQ Damper/Sensor
9 = Airside/Waterside Econ and TRAQ Damper/Sensor

Emergency Override: Request

Multi-State

Building control property is used control the unit into emergency override mode.
0 = Normal (assumed initial value)
1 = Pressurize
2 = Depressurize
3 = Purge
4 = Shutdown
255 = 0xFF = Normal

Emergency Override: Tracer

Multi-State

Building control property that communicates the emergency override request to the controller. 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
255 = 0xFF = Normal

Energy Recovery Exhaust Air Bypass Damper Position

Numeric

Indicates the current Position of the Energy Recovery Exhaust Air Bypass Damper. 
Valid Range: 0-100%. Invalid: 0x7FFF

Energy Recovery Leaving Exhaust Temperature

Numeric

Indicates the current temperature of the energy recovery wheel leaving exhaust air. Invalid 0x7FFF

Energy Recovery Outdoor Air Bypass Damper Position

Numeric

 Indicates the current position of the energy recovery wheel outside air bypass damper.
Valid Range: 0-100%. Invalid: 0x7FFF

Energy Recovery Wheel Frost Avoidance

Multi-State

 Indicates the current status of the Energy Recovery Frost Avoidance function for monitoring.  When the energy recovery wheel exhaust temperature falls below the frost avoidance setpoint, the controller initiates a frost avoidance sequence (modulates the outside air bypass damper to maintain setpoint, and/or energizes a pre-heater.)  The Network Variable associated with this property uses two fields (a State field and a Value field) to display an answer. Valid Range:
0 = Inactive
1 = Enable
2 = Not Present

Energy Recovery Wheel Preheat Relay Status

Multi-State

Indicates the current status of the energy recovery wheel preheat relay output. Valid Range:
0 = Off
1 = On
2 = Not Present

Energy Recovery Wheel Relay Status

Multi-State

Indicates the current operational status of the energy recovery wheel. Valid Range:
0 = Off
1 = On
2 = Not Present

Entering Water Temperature: Active

Numeric

Controller property that displays the effective, local or communicated, entering water temperature. When both exist, the communicated value is sent.
Valid Range: 14.00 to 212.00 deg. F
(-10.00 to 100.00 deg. C).

Evaporator Frost Cutout Temperature

Numeric

Indicates the active frost avoidance setpoint. Valid Range: 25 to 35° F (-3.9 to 1.7° C)
Invalid 0x7FFF

Evaporator Frost Protection Status [1-8]

Binary

Indicates if any of the refrigeration circuits are below the evaporator frost cutout temperature. There are up to 8 circuits.
0 = Not in frost protect (or Not Present)
1 = In frost protect

 Evaporator Refrigerant Temperature[1-8]

Numeric

 Indicates the evaporator leaving temperature in circuits 1 through 8.
Invalid = 0x7FFF

Exhaust Damper Position

Numeric

Indicates the current status of the exhaust damper. Valid Range: 0-100% Invalid = 0x7FFF

Exhaust Enable Position

Numeric

This read-only configuration property indicates the default exhaust enable outdoor air damper position setpoint. Valid Range: 0 to 100%

Exhaust Fan Status

Numeric

Controller property that displays the unit's status of the exhaust fan output.
Valid Range:
0 to 100 % (0% =Off and 100% = On).

Exhaust/Return Type

Multi-State

Controller property that displays the unit's exhaust/return configuration.
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 with Modulating Exhaust Damper
7 = 2 Speed Exhaust Fan with Modulating Exhaust Damper
8 = 3 Speed Exhaust Fan with 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

Face And Bypass: Active

Numeric

Controller property that displays the unit's status of face bypass damper.
Valid Range: 0 to 100% (0% = Full Bypass and 100% = Full Face)

Generic Binary Input

Multi-State

Controller property that displays the state of generic Binary input 1.
0 = Off
1 = On
2 = Not Present.

Generic Binary Output

Multi-State

Controller property that displays the presence and state of generic Binary output 1.
0 = Off
1 = On
2 = Not Present.

Generic Temperature

Numeric

Controller property that displays the status of the local generic temperature input.
Typical Range: -40.00 to 158.00 deg. F (-40.00 to 70.00 deg. C).

Heat Output

Numeric

Controller property that displays the status of the unit's primary heat capacity (if hydronic, report valve position of primary heat valve).
Valid Range: 0 to 100%.

Heat Output Secondary

Numeric

Controller property that displays the status of the unit's secondary heat capacity (if hydronic, report valve position of secondary heat valve).
Valid Range: 0 to 100%.

Heat Setpoint Occupied

Numeric

Controller property that selects the unit’s occupied heating space setpoint.
40.00 to 115.00 deg. F (4.44 to 46.11 deg. C).

Heat Setpoint Occupied Standby

Numeric

Controller property that selects the unit’s occupied standby heating space setpoint.
40.00 to 115.00 deg. F (4.44 to 46.11 deg. C).

Heat Setpoint Unoccupied

Numeric

Controller property that selects the unit’s unoccupied heating space setpoint.
40.00 to 115.00 deg. F (4.44 to 46.11 deg. C).

Heat Stage Status  [1-8]

Multi-State

Controller property that indicates the presence and state of the unit’s heat stage.
0 = Off
1 = On
2 = Not Present

Heat/Cool Mode: Active

Binary

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

Heat/Cool Mode: Ref

Building control property defines what mode being either heating or cooling that is communicated down to the unit as the heat/cool mode.
0 = Heat
1 = Cool
Not Used = Unit decides appropriate unit mode

Heating Control: Ref

Building control property that selects the allowable heating capacity the controller may use.
0 to 100% (0% = Disabled and 100% = Fully Enabled)

Heating Control: Tracer

Numeric

Building control property that is used to communicate heating capacity to the controller.
0 to 100% (0% = Disabled and 100% = Fully Enabled)

Heating Disable: Ref

Building control Binary property is used to enable or disable the unit’s heating control.
0 = Auto/Enable
1 = Disable all stages

Language Identifier

Multi-State

Controller property that displays what language is being used. Alarm messages will be sent in the current language.
0 = English
1 = French
2 = German
3 = Spanish
4 = Portuguese
5 = Dutch
6 = Italian.

Last Control Date/Time

Numeric

Building control property that indicates the date and time when the present value property of this object was last controlled. The date and time value is stored and manipulated in the BCU’s standard date/time format, which is a value of seconds past midnight of January 1^st, 1980.

Load: Absolute

Numeric

Controller property that is used by water-cooled condensing units to indicate the current heat/cool energy demand of the unit. This property is intended to be reference by a water loop control application.
-100 to 100 % (-100% = Heating and 100% = Cooling)

Load: Terminal

Numeric

Controller property that used by water-cooled condensing units to indicate the current heat/cool energy demand of the unit.
-150% = (Screaming for heat)
-100% = (Heating) to 100% = (Cooling)
Invalid: 163.835

Location Label

Text String

Controller property that displays unit programmed description text such as a room location.
Any ASCII string up to 31 bytes total length.

Max Heat: Active

Binary

Controller derived property that is used to display the current status of the "max heat" or "test" modes of the DAC UCM.
0 = not in "Max Heat" or "test"
1 = in "Max Heat" or "test" modes.
Defined by enumerated values of nvoUnitStatus.

Minimum Off Time

Numeric

Building control property that sets the minimum off time requirement before the present value can change to an on state. This value serves to protect the hardware from cycle times that might harm the hardware.
0 to 120 minutes

Minimum On Time

Numeric

Building control property that sets the minimum on time requirement before the present value can change to an off state. This value serves to protect the hardware from cycle times that might harm the hardware.
0 to 120 minutes

Minimum Time Remaining

Numeric

Building control property that displays the minimum time remaining (if any) of a minimum On/Off time control action for the UCM. PUTS are also allowed so that an operator can intervene on a Minimum On/Off control action that is in progress.
0 to 120 minutes

Mixed Air Low Limit Setpoint: Local

Numeric

Controller property that displays the unit’s default minimum mixed air temperature.
Typical Range: -4.00 to 104.00 deg. F (-20.00 to 40.00 deg C).

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

Controller property that displays the unit’s actual mode of the unit.
1 = Heat
2 = Morning Warm-up
3 = Cool
4 = Night Purge
5 = Pre Cool
6 = Off
7 = Test
8 = Emergency Heat
9 = Fan Only
12= Max Heat

Mode: Heat/Cool

Multi-State

Controller property that displays the unit’s current Heat/Cool mode of the unit. This property will show that the unit is in a "Test" mode while Mode: Active may not show unit in this mode.
1 = Heat
2 = Morning Warm-up
3 = Cool
4 = Night Purge
5 = Pre Cool
6 = Off
7 = Test
8 = Emergency Heat
9 = Fan Only
12= Max Heat

Mode: Occupancy

Multi-State

Controller property that displays the unit’s effective, local or communicated, occupancy status. When both exist, the communicated value has priority. Valid Range:
0 = Occupied
1 = Unoccupied
2 = Occupied Bypass
3 = Occupied Standby
255= 0xFF = No control sent - Unit determines the occupancy

Node Self Doc

Text String

This property displays the unit's type of UCM (i.e., ZN510, ZN520, MP580, etc.)

Object Identifier

Object ID

Building control property uniquely identifies a particular object. It is provided primarily to allow the embedding of the object ID in the returned data buffer.

Object Name

Character

String

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

Object Type

Multi-State

Building control property displays the object’s type (i.e., analog input, Binary input, TCM, PCM, etc.).

Occupancy: Active

Binary

Controller derived property that displays current occupancy of unit in terms of either occupied or unoccupied.
0 = Unoccupied
non-0 = Occupied.

Occupancy: Tracer

Multi-State

Building control property that is used to communicate the occupancy request to the controller. The communicated value used in conjunction with the local input to determine effective occupancy.
0 = Occupied
1 = Unoccupied
3 = Occupied Standby

Occupied Bypass Time

Unsigned Word

Controller property which sets the unit’s 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 thermostat timed override request, if present.
0 to 240 minutes.

Occupied Bypass: Active

Binary

Controller property which displays whether or not the unit is a bypass mode occupancy.
0 = not in Occupied Bypass
non-0 = Occupied Bypass..

Outdoor Air Cooling Lockout: Local

Numeric

Controller property which is used to define the cooling lockout point, below which mechanical cooling should be disabled.
Typical Range: 14.00 to 68.00 deg. F (-10.00 to 20.00 deg C).

Outdoor Air Damper Position

Numeric

Controller property which displays the unit’s current position of the Outdoor Air Damper.
Valid Range: 0 – 100%
Invalid or Property Not Supported: 163.835

Outdoor Air Enthalpy

Numeric

Controller property which displays the unit’s effective, 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 Enthalpy Setpoint: Local

Numeric

Controller property which defines the point at which outdoor air enthalpy is appropriate for economizing.
Typical Range: 10.0 to 99.9 BTU/lb (23.26 to 232.37 KJoules/Kg).

Outdoor Air Flow

Numeric

Controller property which displays the unit’s effective, local or communicated, outdoor air flow.
Typical Range: 0 to 137728.5 cfm (0 to 65,000 l/sec). 65,535 means Invalid or Property Not Supported.

Outdoor Air Humidity: Active

Numeric

Controller property which displays the unit’s effective, local or communicated, outdoor air relative humidity as a percentage, When both exist, the communicated value has priority.
Valid Range: 0% to 100%.
Invalid or Property Not Supported =163.835

Outdoor Air Humidity: Input

Numeric

Controller property which displays the unit’s hardwired outdoor air relative humidity as a percentage,
Valid Range: 0% to 100%.
Invalid: 163.835

Outdoor Air Humidity: Ref

Building control property that defines the outdoor air humidity that is communicated down to the unit.
0% to 100%.

Outdoor Air Humidity: Tracer

Numeric

Building control property that is used to communicate the outdoor air humidity to the controller. Communicated value used over local value when both are present.
0% to 100%.

Outdoor Air Min Flow Stpt: Local

Numeric

Controller property that is used as the unit’s default outdoor air min flow setpoint.
Valid Range: Typical Range: 0 to 137728.5 cfm (0 to 65,000 l/sec). 65,535 means Invalid or Property Not Supported.

Outdoor Air Min Flow Setpoint: Ref

Building control property used to set the economizer’s outdoor air minimum flow setpoint that is communicated down to the unit.
0.0 to 137728.5 cfm (0 to 65,000 l/sec). 65,535 means Invalid or Property Not Supported.

Outdoor Air Min Flow Setpoint: Tracer

Numeric

Building control property that is used to communicate the economizer’s outdoor air minimum flow setpoint to the controller.
0.0 to 137728.5 cfm (0 to 65,000 l/sec). 65,535 means Invalid or Property Not Supported.

Outdoor Air Temp Setpoint: Local

Numeric

Controller property that is used to define the minimum outdoor air temperature suitable for economizing.
Typical Range:
32.00 to 122.00 deg. F (0.00 to 50.00 deg C).

Outdoor Air Temperature: Active

Numeric

Controller property that displays the effective, local or communicated, outdoor air temperature. When both exist, the communicated value has priority.
Typical Range: 
-40.0 to 212.0 deg. F (-40.00 to 100.00 deg. C)

Outdoor Air Temperature: Input

Numeric

Controller property that displays the unit’s local outdoor air temperature input.
Typical Range:
-40.0 to 212.0 deg. F (-40.00 to 100.00 deg. C)

Outdoor Air Temperature: Ref

Property

Reference
(Numeric)

Building control property that sets an Outdoor Air Temperature that is communicated down to the unit.
-40.0 to 212.0 deg. F (-40.00 to 100.00 deg. C)

Outdoor Air Temperature: Tracer

Numeric

Building control property that is used to communicate the outdoor air temperature to the controller. Communicated value used over local value when both are present.
-40.0 to 212.0 deg. F (-40.00 to 100.00 deg. C)

Present Value

OP Mode

Building control property is used to control the UCM to one of nine standard operation modes. These modes are defined as Unoccupied, Optimal Stop, Occupied, Optimal Start, Demand Limit, Duty Cycle, Priority Shutdown, Night Economize, and Night Heat Cool.

Refrigerant Type

Multi-State

Controller property that displays the unit’s refrigerant configuration.
Valid range: 0 – 255.

Reheat Type

Multi-State

Controller property that displays the unit’s reheat configuration.
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

Reset Maintenance Timer

Binary

Building control property that is used to reset the maintenance timer in the DAC UCM.
0 = Off
non-0 = Reset Timer.

Return Fan Pressure Setpoint: Local

Numeric

Controller property that defines the default return fan pressure setpoint.
Typical Range: -0.10 to 0.40 I.W.C. 
(-25 to 100 Pa),

Return Fan Pressure: Active

Numeric

Controller property that displays the effective return fan pressure.
Typical Range: -0.10 to 0.40 I.W.C. 
(-25 to 100 Pa). 32,767 = Invalid or Property Not Supported.

Return Fan Status

Numeric

Controller property that displays the status of the unit's return fan output.
Valid Range: 0% to 100% (On).

Saturated Condenser Temperature

Numeric

An array of up to 8 temperatures representing the local or communicated active condenser temperatures.
Invalid or Property Not Supported = 327.67.

Space CO2 Concentration: Input

Numeric

Controller property that displays the unit’s space carbon dioxide (CO2) concentration in parts per million (ppm), if the UCM has a locally wired CO2 sensor.
Valid Range: 0 to 5000 ppm. The value 0xFFFF (65535) is reserved to indicate an invalid value.

Space CO2 Concentration: Ref

Building control property that is used to communicate the space CO2 concentration that is communicated down to the unit This property indicates the value used by the BCU to determine which value to communicate as the.
0 to 5000 ppm. No invalid value defined.

Space CO2 Concentration: Tracer

Numeric

Building control property that is used to communicate the space CO2 levels in PPM to the controller. The unit can also have a locally wired CO2 sensor.
0 to 5000 PPM. The value 0xFFFF (65535) is reserved to indicate an invalid value and is the default value.

Space CO2 Limit

Numeric

Controller property which defines a high limit CO2 setpoint configuration property for the controlled space.
Typical Range: 1 to 3000 ppm. 
Invalid/default: 0 ppm.

Space Enthalpy

Numeric

Controller property that displays the effective, local or communicated, space enthalpy, When both exist, the communicated value has priority.
Typical Range: 8.60 to 42.99 BTU/lb 
(20 to 100 KJoules/Kg).

Space Humidity: Active

Numeric

Controller property that displays the effective, local or communicated, space relative humidity as a percentage, When both exist, the communicated value has priority.
Valid Range: 0% to 100%.
Invalid: 163.835

Space Pressure Setpoint: Local

Numeric

Controller property that displays the default space pressure setpoint.
Typical Range: -1.00 to 1.00 I.W.C. 
(-250 to 250 Pa).

Space Pressure Setpoint: Ref

Property

Reference
(Numeric)

Building control property defines a space pressure setpoint that is communicated down to the unit.
Typical Range: -1.00 to 1.00 I.W.C.
(-250 to 250 Pa). 32,767 = Invalid or Property Not Supported.

Space Pressure Setpoint: Tracer

Numeric

Building control property that is used to communicate the space pressure setpoint to the controller. Communicated value used over local value when both are present.
Typical Range: -1.00 to 1.00 I.W.C.
(-250 to 250 Pa). 32,767 = Invalid or Property Not Supported.

Space Pressure: Active

Numeric

Controller property which displays the unit’s effective, local or communicated, space pressure. When both exist, the communicated value has priority.
Typical Range: -2.00 to 2.00 I.W.C.
(-500 to 500 Pa). 32,767 = Invalid or Property Not Supported.

Space Pressure: Ref

Property

Reference
(Numeric)

Building control property that defines the space pressure that is communicated down to the unit.
Typical Range: -2.00 to 2.00 I.W.C.
(-500 to 500 Pa). 32,767 = Invalid or Property Not Supported.

Space Pressure: Tracer

Numeric

Building control property that is used to communicate the space pressure to the controller. Communicated value used over local value when both are present
Typical Range: -2.00 to 2.00 I.W.C.
(-500 to 500 Pa). 32,767 = Invalid or Property Not Supported

Space Temperature: Active

Numeric

Controller property which displays the unit’s effective, local or communicated, space temperature. When both exist, the communicated value has priority. If neither exist, the unit uses its stored default value.
Typical Range: 14.0 to 122.0 deg. F 
(-10.00 to 50.00 deg. C).

Space Temperature: Ref

Property

Reference
(Numeric)

Building control property that defines the Space Temperature humidity that is communicated down to the unit. .
14.0 to 122.0 deg. F. 
(-10.00 to 50.00 deg. C.)

Space Temperature: Tracer

Numeric

Building control property that is used to communicate the space temperature to the controller. Communicated value used over local value when both are present.
14.0 to 122.0 deg. F. 
(-10.00 to 50.00 deg. C.)

Startup Setpoint

Numeric

Building control property defines the threshold for warm-up or pre-cool at start-up.
Default value = 72.00 deg. F 
(22.22 deg. C).

Startup Time Delay

Unsigned Word

Controller property that represents the amount of time the controller waits (after power-up) before invoking the normal control algorithm operation.
0 to 6553 seconds

Supply Fan Run Time

Numeric

Controller property that displays the number of fan run hours elapsed since the "maintenance required" diagnostic was initiated and cleared.
Valid Range: 0 to 65535 hours.

Supply Fan Status

Numeric

Controller property that displays the status of unit's fan output.
0 to 100 % (0% = Off and 100% = Fully enabled On).

Supply Fan Type

Multi-State

Controller property that displays the unit’s supply fan configuration.
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

Controller property that displays the active status of the Timed Override flag that is set when the ON button is pushed on the zone sensor.
0 = No Override Request
non-0 = Timed Override

Timed Override Request: Cancel

Binary

Controller property that displays the active status of the Cancel Timed Override flag that is set when the CANCEL button is pushed on the zone sensor.
0 = No Override Request Cancel
non-0 = Timed Override Cancel

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.

Water Valve Drive Closed: Ref

Property

Reference
(Binary)

Building control property is used to override all of the water valves to a closed position. This property is evaluated by the Water Valve Override: Tracer property.
0 = Auto
1 = Close all valves.
Used in conjunction with Water Valve Drive Open: Ref

Water Valve Drive Open: Ref

Property

Reference
(Binary)

Building control property is used to override all of the water valves to an open position. This property is evaluated by the Water Valve Override: Tracer property.
0 = Auto
1 = Open all valves.
Used in conjunction with Water Valve Drive Closed: Ref

Water Valve Override: Tracer

Multi-State

Building control system’s communicated override command that overrides the unit’s water valves operation. This property relies upon states of Water Valve Drive Open: Ref and Water Valve Drive Closed: Ref properties. Water valve drive open override will have preference over a water valve drive closed override.
0 = Normal
4 = Open all valves
5 = Close all valves
All other values = Not Used