| Property | Type | Description |
|
Alarm Event Class [1-3] |
Numeric |
This is a three element array containing entries for alarm classes Manual Reset, Auto Reset, & Informational diagnostics. Each entry contains an index into the event action table. The event action table contains both a set of instructions for alarm routing, and a list of referencer objects (the potential receivers). |
|
Alarm Output |
Binary |
This is the status of the alarm output on the UCP2. |
|
Base Load Current Setpt: 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 base load current setpoint. |
|
Base Load Current Setpt: Tracer |
Numeric |
This property is the Tracers request for a base load current setpoint. It will be used as a current draw setpoint by the chiller if it is in the Base Loading mode. To relinquish control of the setpoint, a null referencer must be assigned. Units: %. Range: 40 to 100% in increments of 1%. Default: 100% |
|
Base Loading Request: Ref |
Property Reference |
This property indicates the value to be used by the BCU to determine which value to communicate to the UCM to request base loading. |
|
Base Loading Request: Tracer |
Binary |
This property is used to control the Base Loading mode of the chiller Auto (1) or Off(0) from the Tracer. Default: Off. |
|
Base Loading Status |
Binary |
This property indicates the active operating status of the Base Loading mode. |
|
Chilled Water Flow Status |
Binary |
This is the status of the chilled water flow switch input on the UCP2. |
|
Chilled Water Pump Output |
Binary |
Indicates the active mode of the binary output used to enable and disable the chilled water pump (ON or OFF). |
|
Chilled Water Reset Type |
Multi-state |
This the method the control algorithm in the UCP2 uses to reset the leaving chilled water temperature. The algorithm can be calculated based on Returned Chilled Water (1), Constant Return (2), Outside Air Temperature (3), or it can be completely disabled (0). |
|
Chilled Water Setpoint: Active |
Numeric |
This is the value being used by the UCP2 for chilled water temperature control. |
|
Chilled Water Setpoint: External |
Numeric |
An optional external analog input can be wired to the UCP2 and used for the chilled water setpoint. If the chiller has this option installed, this property indicates the value being received from that external analog input. |
|
Chilled Water Setpoint: 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 chilled water setpoint. |
|
Chilled Water Setpoint: Source |
Multi-state |
This indicates where the Chilled Water Setpoint: Active is being generated (i.e., Tracer, front panel, externally wired, etc.). The available sources are: front panel, external, external direct capacity control, and Tracer. |
|
Chilled Water Setpoint: Tracer |
Numeric |
This property is the Tracers request for chilled water temperature setpoint. It will be used as the Leaving Evaporator Water setpoint by the chiller. To relinquish control of the setpoint, a null referencer must be assigned. Units: F or C. Range: 0 to 65 F (17.8 to 18.3 C). Default: Null. |
|
Chilled Water Temp: Delta |
Numeric |
This is the temperature change across the evaporator of the fluid flowing through the evaporator. Calculated by subtracting the Chilled Water Temperature: Entering value from the Chilled Water Temperature: Leaving value. |
|
Chilled Water Temp: Entering |
Numeric |
This property indicates the value for the temperature of the fluid entering the evaporator. |
|
Chilled Water Temp: Leaving |
Numeric |
This property indicates the value for the temperature of the fluid leaving the evaporator. |
|
Chilled Wtr Pump Request: Ref |
Property Reference |
This property indicates the value to be used by the BCU to determine which value to communicate to the UCM to control the chilled water pump. |
|
Chilled Wtr Pump Request: Tracer |
Binary |
This property is used to turn the Chilled Water Pump Output of the chiller On (1) or place it in the Auto (0) mode from the Tracer. Default: Auto. |
|
Chiller Enable/Disable: External |
Binary |
This is the active status of a binary input on the UCP2 for an external device (typically not a BCU) used to enable and disable the chiller. |
|
Chiller Enable/Disable: Tracer |
Binary |
This property is used to place the chiller in Auto (1) or Stop (0) from the Tracer (priority arbitrated by PRESENT_VALUE). |
|
Chiller Mode |
Multi-state |
This property indicates the active operating status of the Chiller mode. |
|
Communication Address |
Numeric |
Indicates the assigned communications address value of the chiller. |
|
Communication Bad Message Count |
Numeric |
Keeps track of the number of message errors that occur when attempting to communicate with the chiller. |
|
Communication Channel |
Numeric |
Indicates the assigned communications channel value of the chiller. |
|
Communication Error Count |
Numeric |
Keeps track of the number of communications errors that occur when attempting to communicate with the chiller. |
|
Communication No Answer Count |
Numeric |
Keeps track of the number of unanswered communications with the chiller. |
|
Communication State |
Binary |
This property indicates the status of communications between the BCU and the UCM. 0=Down, 1=Up. |
|
Compressor Avg Line Voltage |
Numeric |
This property indicates the average of the three values obtained from the Compressor Phase Voltage property. |
|
Compressor Current Draw |
Numeric |
This property indicates the percent of the maximum rated load amps (% RLA) the chiller is actively drawing (calculated based on the average of the three values obtained from the Compressor Phase Current Draw property). |
|
Compressor Current Imbalance |
Numeric |
This property indicates whether there is a current imbalance based on calculations using the three values for Compressor Phase Current Draw. |
|
Compressor Disch Superheat Ct Pt |
Binary |
This property indicates active status of the Control Point used in the evaporator and superheat control algorithms. |
|
Compressor Disch Superheat Temp |
Numeric |
This property indicates a calculated temperature obtained by subtracting the Saturated Refrigerant Condenser temperature from the Compressor Discharge Refrigerant temperature. |
|
Compressor Discharge Refrig Temp |
Numeric |
This property indicates the temperature of the hot refrigerant gas coming out of the compressor and discharged into the condenser. |
|
Compressor Motor Winding Temp[1–3] |
Numeric |
There are three motor windings corresponding to the three power inputs into the chiller. Embedded in the compressor motor are three sensors (one for each power input and winding) which monitor the temperature of the motor windings. Array of three |
|
Compressor Phase Current Draw[1–3] |
Numeric |
This property indicates the percent of the maximum rated load amps (% RLA) each phase is actively drawing (there are three phases). Array of three |
|
Compressor Phase Voltage[1–3] |
Numeric |
This property indicates the voltage for each power input into the compressor (there are three). Array of three |
|
Compressor Power |
Numeric |
This property indicates in kilowatts (KW) the amount of power the unit is drawing. This property will only be available if the line voltage sensing option is installed on the chiller. |
|
Compressor Run Time |
Numeric |
This property indicates the accumulated compressor run time since the UCP2 was installed. |
|
Compressor Run Time CLD |
Numeric |
This property indicates the accumulated compressor run time since the UCP2 was installed. |
|
Compressor Running |
Binary |
This property indicates whether the compressor is running (ON) or not running (OFF). |
|
Compressor Starts |
Numeric |
This property indicates the number of starts since the UCP2 was installed. |
|
Compressor Voltage Imbalance |
Numeric |
This property indicates the percentage of voltage imbalance among the three phases serving the unit based on calculations using the three values for the Compressor Phase Voltage property. |
|
Cond Water Pump Request: Ref |
Property Reference |
This property indicates the value to be used by the BCU to determine which value to communicate to the UCM to control the condenser water pump. |
|
Cond Water Pump Request: Tracer |
Binary |
This property is used to turn the Condenser Water Pump Output of the chiller On (1) or place it in the Auto (0) mode from the Tracer. Default: Auto. |
|
Condenser Approach Temperature |
Numeric |
This is the condenser approach temperature which is calculated as the difference between the condenser water temperature: Leaving and condenser saturated refrigerant temperature properties. |
|
Condenser Saturated Refrig Press |
Numeric |
This is the active value of the condenser refrigerant pressure input on the UCP2. |
|
Condenser Saturated Refrig Temp |
Numeric |
This is the active value of the condenser refrigerant temperature input on the UCP2. |
|
Condenser Water Flow Status |
Binary |
This is the status of the condenser water flow switch input on the UCP2. |
|
Condenser Water Pump Output |
Binary |
This property indicates the active status of the binary output on the UCP2 used to control the condenser water pump ON or OFF. |
|
Condenser Water Temp: Delta |
Numeric |
This property indicates the temperature change of the water flowing through the condenser calculated by subtracting the Condenser Water Temperature: Entering value from the Condenser Water Temperature: Leaving value. |
|
Condenser Water Temp: Entering |
Numeric |
This property indicates the temperature of the water entering the condenser. |
|
Condenser Water Temp: Leaving |
Numeric |
This property indicates the temperature of the water leaving the condenser. |
|
Control Event Class |
Numeric |
Contains the Alarm and Message Routing Class number (1–20) that is used to route messages when this object is in controlled. |
|
Current Limit Setpoint: Active |
Numeric |
This property is the value (in % RLA) being used by the UCP2 for current limiting may override the chilled water setpoint. |
|
Current Limit Setpoint: External |
Numeric |
This is the active status of an analog input on the UCP2 for an external device (typically not a BCU) which accepts values that can be used as the Current Limit Setpoint. |
|
Current Limit Setpoint: 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 current limit setpoint. |
|
Current Limit Setpoint: Source |
Multi-state |
This property indicates from which source the Current Limit Setpoint: Active is receiving its input. The different sources available for input are: front panel, external, Tracer, and Ice Building. |
|
Current Limit Setpoint: Tracer |
Numeric |
This property is the Tracer’s request for a current limit setpoint. It will be used as a high limit for current draw by the chiller. To relinquish control of the setpoint, a null referencer must be assigned. Units: %. Range: 0 to 100% in increments of 1%. Default: 100%. |
|
Diag: Automatic Reset |
Binary |
This property indicates that a diagnostic exists which takes part or all of the chiller offline. The diagnostic will automatically be reset when the condition causing the diagnostic is fixed.0 = None Detected, 1 = Active |
|
Diag: Information Warning |
Binary |
This property indicates that a diagnostic exists which informs or warns but does not cause the chiller to stop running. |
|
Diag: Manual Reset Required |
Binary |
This property indicates that a diagnostic exists that causes the chiller to shut down. The chiller remains offline until a reset is initiated. Reset can be initiated at the chiller front panel or in the Tracer Summit UCM Editor.Note: Not all diagnostics can be reset in the Tracer Summit UCM Editor. |
|
Diag: New |
Multi-State |
Not Applicable. |
|
Diagnostic Condition |
Multi-state |
This property is the diagnostic which is active on the chiller. |
|
Diagnostic Condition: History[01–20] |
Multi-state |
This property indicates the last twenty diagnostics to occur. Array of 20 enumerations |
|
Diagnostic Date/Time Stamp Hist[01–20] |
Date/Time Numeric |
Array of 20 date/time values (integer containing a value representing seconds past midnight of Jan 1st, 1980) |
|
Emergency Stop: External |
Binary |
This property is a binary input to the UCP2 which allows an external device to completely shut down the chiller on an immediate/emergency basis. |
|
Evaporator Approach Temperature |
Numeric |
This is the evaporator approach temperature which is calculated as the difference between the Evaporator Water Temperature: Leaving and Evaporator Saturated Refrigerant Temperature. |
|
Evaporator Saturated Refrg Press |
Numeric |
This property indicates the refrigerant gas pressure measured in the evaporator. |
|
Evaporator Saturated Refrg Temp |
Numeric |
This property indicates the refrigerant temperature measured on the discharge side of the evaporator. |
|
Extended Unloading Time |
Numeric |
This property indicates the total accumulated number of operating hours that the chiller has been in the extended unloading mode since the UCP2 was installed. |
|
EXV Position |
Numeric |
This property indicates the active position of the electronic expansion valve (measured in % open). |
|
Head Relief Request |
Binary |
This property indicates the status of the binary output on the UCP2 which controls the request for head relief. |
|
Heat Sink Temperature |
Numeric |
This property only applies when the chiller has the optional solid state starter installed. It indicates active temperature in the heat sink of the solid state starter and is used in the start inhibit algorithm. |
|
Ice Making Active |
Binary |
This property indicates the status of a binary output on the UCP2 which indicates whether the chiller is actively making ice or has completed ice making. |
|
Ice Making Request: External |
Binary |
This property indicates the active status of a binary input on the UCP2 which allows an external device to request that the chiller be in the Ice Making mode. |
|
Ice Making Request: Ref |
Property Reference |
This property indicates the value to be used by the BCU to determine which value to communicate to the UCM to request ice making. |
|
Ice Making Request: Tracer |
Binary |
This property initiates the Ice Making mode of the chiller when transitioned from Off (0) to Auto (1). It can also terminate the Ice Making mode by transitioning back to Off before the chiller has completed the Ice Making process. Default: Off. |
|
Ice Making Status |
Binary |
This property is a Binary that indicates that the ice making feature is ENABLED/DISABLED. It differs from Ice Making Active which indicates that an enabled system is actively making ice. |
|
Ice Termination Setpoint: Active |
Numeric |
When the chiller is in the Ice Making mode, this property indicates the return chilled water temperature setpoint (Chilled Water Temperature: Entering) at which the ice making mode will be terminated. |
|
Ice Termination Setpoint: 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 ice termination setpoint. |
|
Ice Termination Setpoint: Source |
Multi-state |
This property indicates from which source the Ice Termination Setpoint: Active is receiving its input. The different sources available for input are: front panel, external, Tracer. |
|
Ice Termination Setpoint: Tracer |
Numeric |
This property is the Tracer’s request for ice mode termination temperature setpoint. To relinquish control of the setpoint, a null referencer must be assigned. Units: F or C. Range: 20.0 to 32.0 F (-6.7 to 0.0 C). Default: 27 F (-2.8 C). |
|
ICS Operating Mode: Active |
Multi-state |
This property is the Tracer Summit desired control mode. It will contain an enumerated value representing one of the 9 standard control modes used by the system. Currently, UCP2 cannot do ICS Operating Mode processing, so, this property is just used to store the desired control mode for diagnostic purposes. |
|
Last Control Date Time |
Date/Time Numeric |
This indicates the date and time when the present value property of this object was last controlled. |
|
Limit Warning Output |
Binary |
This property indicates the active status of a binary output on the UCP2 which is typically wired to an external device (i.e., an alarm) that lets the operator know when the chiller is in the limit mode. |
|
Maximum Capacity |
Binary |
This property is the active status of a binary input on the UCP2 which indicates when the chiller has reached maximum capacity. |
|
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 which might be harmful. |
|
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 which might be harmful. |
|
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. |
|
Object Identifier |
Object ID |
A data packet containing an object type specifier. This property is provided primarily to allow the embedding of the object ID in the returned data buffer. |
|
Object Type |
Multi-State |
This property indicates the property’s type (i.e., analog input, binary output, TCM, PCM, etc.). |
|
Oil Pump Output |
Binary |
This property indicates the active status of a binary output on the UCP2 which enables and disables the oil pump. |
|
Operating Mode During Diagnostic |
Multi-state |
This property indicates the operating mode of the chiller when the last diagnostic was recorded. |
|
Operating Mode: Unit |
Multi-state |
This property indicates the active operating mode of the UCP2 (or last operating mode if a diagnostic is active). |
|
Outdoor Air Temperature: Active |
Numeric |
This property indicates the active outdoor air temperature being used by the UCP2. |
|
Outdoor Air Temperature: Input |
Numeric |
This property indicates the value of an analog input on the UCP2 which is wired to an outdoor air temperature sensor. This property applies only if an outdoor air temperature sensor is installed on an analog input on the UCP2. |
|
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 to the chiller the outdoor air temperature. The chiller will display this value on the Human interface and could use it for Chilled Water Reset. a null referencer must be assigned if the chiller is to use it’s local sensor for these functions. Units: F or C. Range: -100 to 150 F (-37.8 to 65.6 C). |
|
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. |
|
Product ID |
Numeric |
This property will identify the product specific to the implementation. In this case, it would be the Centrifugal Chiller ID number. (see also Current Product Revision) |
|
Refrig Concentration Channel[1-4] |
Numeric |
This property indicates the refrigerant concentration inputs (in ppm) on the refrigerant monitor. |
|
Refrig Concentration: Active |
Numeric |
This property indicates the active refrigerant concentration input (in ppm). |
|
Refrig Concentration: 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 refrigerant concentration input. |
|
Refrig Concentration: Tracer |
Numeric |
This property indicates to the chiller the refrigerant concentration in the mechanical room. The chiller will display this value on the Human Interface. a null referencer must be assigned if the chiller is to use it’s local sensor for this purpose. Units: ppm (parts per million). Range: 0 to 50,000 ppm, in increments of 0.1 ppm. |
|
Refrigerant Concentration: Input |
Numeric |
This property indicates the value of an analog input on the UCP2 which is wired to a refrigerant monitor (in ppm). This property applies only if a refrigerant monitor is installed on an analog input on the UCP2. |
|
Refrigerant Type |
Multi-state |
This property indicates the type of refrigerant the chiller is using. The possible refrigerant types are: HCFC 123, CFC 11, CFC 12, HFC 134A, HCFC 22, or Water. |
|
Reset Relay Output |
Binary |
This property indicates the active status of a binary output on the UCP2 which controls the Reset Relay Output. |
|
Restart Inhibit Timer |
Numeric |
This property indicates the amount of time that must elapse before the UCP2 will allow the compressor to start, when the compressor is off-line. |
|
Tracer Comm Packet Revision |
Numeric |
This property indicates the active software revision level for the various modules in the UCP2. |
|
Tracer Controlled Relay: Ref |
Property Reference |
This property indicates the value to be used by the BCU to determine which value to communicate to the UCM to control the Tracer controlled relay. |
|
Tracer Controlled Relay: Tracer |
Binary |
This property is used to turn the Tracer Controlled Relay of the chiller On (1) or Off(0) from the Tracer. Default: Off. |
|
Tracer Temperature Sensor |
Numeric |
This property indicates the value of an analog input on the UCP2 which can be used to measure any miscellaneous analog property. |
|
Update Tag |
Numeric |
Object instance update tag. This tag is used to indicate that the nonvolatile memory resident data within the particular instance has changed. The workstation is the primary user of this property. |