| Property | Type | Description |
|
Alarm Event Class[1–3] |
Numeric |
An index into the event action table. The event action table contains both a set of instructions for alarm routing and a stretchy list of referencer objects (the potential receivers). |
|
Alarm Output |
Binary |
This is the status of the alarm output on the RTW chiller indicating that a manual reset of the chiller is required. |
|
Chilled Water Pump Output |
Binary |
This property shows the active status of the binary output on the chiller UCM which is used to control the chilled water pump. 1=ON, 0=OFF |
|
Chilled Water Setpoint: Active |
Numeric |
This is the value being used by the chiller for chilled water temperature control. |
|
Chilled Water Setpoint: External |
Numeric |
An optional external analog input can be wired to the chiller 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 to define the chilled water setpoint. |
|
Chilled Water Setpoint: Tracer |
Numeric |
This property is the Tracer’s 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 temperature of the fluid entering the evaporator. |
|
Chilled Water Temp: Leaving |
Numeric |
This property indicates the temperature of the fluid leaving the evaporator. |
|
Chilled Wtr Pump Request: Ref |
Binary |
This property indicates the value to be used by the BCU to determine which value to communicate to the UCM to enable or disable Chilled Water Pump Request. |
|
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 Average Line Voltage |
Numeric |
This property indicates the average line voltage for the entire chiller as the percent of the nominal line voltage. The nominal line voltage is a factory setting in the UCM. |
|
Chiller 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 values obtained from the Compressor Phase Current Draw properties). |
|
Chiller Enable/Disable: Tracer |
Binary |
This property is the Tracer’s request to enable or disable the chiller. |
|
Chiller Tons Nominal |
Numeric |
This property indicates the nominal ton range rating of the chiller. |
|
CKT1 Lockout: Tracer |
Binary |
This property allows service personnel to set a lockout, preventing Circuit 1 from operating. Once circuit lockout is enabled, the circuit will remain locked out even through a reset or power down. (Lock out circuit 1? 1=YES, 2=NO. |
|
CKT2 Lockout: Tracer |
Binary |
This property allows service personnel to set a lockout, preventing Circuit 2 from operating. Once circuit lockout is enabled, the circuit will remain locked out even through a reset or power down. (Lock out circuit 2? 1=YES, 2=NO. |
|
Comm Loss Mode: Request |
Multi-State |
This property indicates the value used by the Tracer to communicate to the UCM in the event of a communication loss. Possible values are: 0=STOP, 1=AUTO, 2=LAST STATE |
|
Comm Loss Mode: Tracer |
Binary |
This property indicates the default mode for the chiller in the event of communications loss with the Tracer. 1=AUTO, 0=STOP |
|
Communication Address |
Numeric |
Indicates the assigned communications address value of the chiller. |
|
Communication Bad Message Count |
Numeric |
This is a property for keeping track of the number of message errors which occur when attempting to communicate with the UCM hardware. |
|
Communication Channel |
Numeric |
This property provides access to the assigned communications channel value of the chiller. |
|
Communication Error Count |
Numeric |
This is a property for keeping track of the number of communications errors that occur when attempting to communicate with the UCM hardware. |
|
Communication No Answer Count |
Numeric |
This is a property for keeping 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. |
|
Compr Suction Refrig Temp: CKT1 |
Numeric |
This property indicates the temperature of the refrigerant gas at the compressor inlet(s) for the compressor(s) in Circuit 1. |
|
Compr Suction Refrig Temp: CKT2 |
Numeric |
This property indicates the temperature of the refrigerant gas at the compressor inlet(s) for the compressor(s) in Circuit 2. |
|
Compressor A Entering Oil Temp |
Numeric |
This property indicates the value of the oil sump temperature for compressor A. (70-125 ton chillers only). |
|
Compressor A Operating Mode |
Multi-State |
This property indicates the active operating mode of compressor A. Possibilities are: Compressor Stop (00), Compressor Lockout (16), Cprsr Service Pumpdown (17), Cprsr Restart Inhibit (70), Cprsr Start (72), Run: Normal (74), Run: Current Limit (75), Run: Condenser Limit (76), Run: Evaporator Limit (77), Run: Unload (7E). |
|
Compressor A Output |
Binary |
This property indicates current status of the binary output used to control compressor A ON (1) and OFF (0). |
|
Compressor A Phase Current Draw [1–3] |
Numeric |
This property indicates the percent of the maximum rated amps (% RLA) each phase is actively drawing for compressor A. (Array of 3). |
|
Compressor A Run Time |
Numeric |
This property serves a non-resettable, non-volatile accumulator of hours for compressor A and is reference by the chiller to determine balancing of compressor hours. Measured in hours. |
|
Compressor A Starts |
Numeric |
This property serves as a non-resettable, non-volatile accumulator of starts for compressor A and is referenced by the chiller to determine balancing of compressor starts. |
|
Compressor B Entering Oil Temp |
Numeric |
This property indicates the value of the oil sump temperature for compressor B. (70-125 ton chillers only). |
|
Compressor B Operating Mode |
Multi-State |
This property indicates the active operating mode of compressor B. Possibilities are: Compressor Stop (00), Compressor Lockout (16), Cprsr Service Pumpdown (17), Cprsr Restart Inhibit (70), Cprsr Start (72), Run: Normal (74), Run: Current Limit (75), Run: Condenser Limit (76), Run: Evaporator Limit (77), Run: Unload (7E). |
|
Compressor B Output |
Binary |
This property indicates current status of the binary output used to control compressor B ON (1) and OFF (0). |
|
Compressor B Phase Current Draw[1–3] |
Numeric |
This property indicates the percent of the maximum rated amps (% RLA) each phase is actively drawing for compressor B. (Array of 3). |
|
Compressor B Run Time |
Numeric |
This property serves as a non-resettable, non-volatile accumulator of hours for compressor B and is referenced by the chiller to determine balancing of compressor hours. Measured in hours. |
|
Compressor B Starts |
Numeric |
This property serves as a non-resettable, non-volatile accumulator of starts for compressor B and is referenced by the chiller to determine balancing of compressor starts. |
|
Compressor C Operating Mode |
Multi-State |
This property indicates the active operating mode of compressor C. Possibilities are: Compressor Stop (00), Compressor Lockout (16), Cprsr Service Pumpdown (17), Cprsr Restart Inhibit (70), Cprsr Start (72), Run: Normal (74), Run: Current Limit (75), Run: Condenser Limit (76), Run: Evaporator Limit (77), Run: Unload (7E). |
|
Compressor C Output |
Binary |
This property indicates current status of the binary output used to control compressor C ON (1) and OFF (0). |
|
Compressor C Phase Current Draw[1–3] |
Numeric |
This property indicates the percent of the maximum rated amps (% RLA) each phase is actively drawing for compressor C. (Array of 3). |
|
Compressor C Run Time |
Numeric |
This property serves as a non-resettable, non-volatile accumulator of hours for compressor C and is referenced by the chiller to determine balancing of compressor hours. Measured in hours. |
|
Compressor C Starts |
Numeric |
This property serves as a non-resettable, non-volatile accumulator of starts for compressor C and is referenced by the chiller to determine balancing of compressor starts. |
|
Compressor Count |
Numeric |
This property indicates the total number of compressors on the chiller. |
|
Compressor D Operating Mode |
Multi-State |
This property indicates the active operating mode of compressor D. Possibilities are: Compressor Stop (00), Compressor Lockout (16), Cprsr Service Pumpdown (17), Cprsr Restart Inhibit (70), Cprsr Start (72), Run: Normal (74), Run: Current Limit (75), Run: Condenser Limit (76), Run: Evaporator Limit (77), Run: Unload (7E). |
|
Compressor D Output |
Binary |
This property indicates current status of the binary output used to control compressor D ON (1) and OFF (0). |
|
Compressor D Phase Current Draw[1–3] |
Numeric |
This property indicates the percent of the maximum rated amps (% RLA) each phase is actively drawing for compressor D (Array of 3). |
|
Compressor D Run Time |
Numeric |
This property serves as a non-resettable, non-volatile accumulator of hours for compressor D and is referenced by the chiller to determine balancing of compressor hours. Measured in hours. |
|
Compressor D Starts |
Numeric |
This property serves as a non-resettable, non-volatile accumulator of starts for compressor D and is referenced by the chiller to determine balancing of compressor starts. |
|
Compressor Running |
Binary |
This property indicates the active run status of the compressors (1=any compressor running). |
|
Cond Fans Percent Running: CKT1 |
Numeric |
This property indicates the fan airflow as a percentage of the total possible airflow for Circuit 1. This calculation is done in the chiller UCM. This property applies to RTA chillers only. |
|
Cond Fans Percent Running: CKT2 |
Numeric |
This property indicates the fan airflow as a percentage of the total possible airflow for Circuit 2. This calculation is done in the chiller UCM. This property applies to RTA chillers only. |
|
Cond Saturated Refrig Press CKT1 |
Numeric |
This is the active value of the condenser saturated refrigerant pressure input from Circuit 1 on the chiller. |
|
Cond Saturated Refrig Press CKT2 |
Numeric |
This is the active value of the condenser saturated refrigerant pressure input from Circuit 2 on the chiller. |
|
Cond Saturated Refrig Temp: CKT1 |
Numeric |
This is the active value of the condenser refrigerant temperature input from Circuit 1 on the chiller. It measures the refrigerant temperature on the discharge side of the condenser. |
|
Cond Saturated Refrig Temp: CKT2 |
Numeric |
This is the active value of the condenser refrigerant temperature input from Circuit 2 on the chiller. It measures the refrigerant temperature on the discharge side of the condenser. |
|
Condenser Fan Contactor: CKT1[1–4] |
Binary |
This property indicates the active status of fans on the condenser on circuit 1. (Array of 4, 1= ON, 0=OFF). This property applies to RTA chillers only. |
|
Condenser Fan Contactor: CKT2[1–4] |
Binary |
This property indicates the active status of fans on the condenser on circuit 2. (Array of 4, 1= ON, 0=OFF). This property applies to RTA chillers only. |
|
Condenser Water Temp: Delta |
Numeric |
This property indicates the temperature change of the water flowing through the condenser. This is calculated by subtracting the Condenser Water Temperature: Entering value from the Condenser Water Temperature: Leaving value. This property applies to RTW chillers only. |
|
Condenser Water Temp: Entering |
Numeric |
This property indicates the temperature of the water entering the condenser. This property applies to RTW chillers only. |
|
Condenser Water Temp: Leaving |
Numeric |
This property indicates the temperature of the water leaving the condenser. This property applies to RTW chillers only. |
|
Control Event Class |
Numeric |
This property identifies the control event class to be used for controlling the given commandable object. |
|
Current Limit Setpoint: Active |
Numeric |
This property is the value (in %RLA) being used by the chiller 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 RTW for an external device (typically not a BCU) which accepts values that can be used 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 to define the current limit setpoint. |
|
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: 40 to 120% in increments of 1%, Default: 100%. |
|
Diag: Automatic Reset |
Binary |
This property indicates a diagnostic that the chiller will automatically reset. 1=ACTIVE |
|
Diag: Automatic Reset CKT1 |
Binary |
This property indicates a diagnostic on Circuit 1 that the chiller will automatically reset. 1=ACTIVE |
|
Diag: Automatic Reset CKT2 |
Binary |
This property indicates a diagnostic on Circuit 2 that the chiller will automatically reset. 1=ACTIVE |
|
Diag: Information Warning |
Binary |
This property indicates a diagnostic that the chiller will not automatically reset but the chiller will remain online until the diagnostic is reset. 1=ACTIVE |
|
Diag: Last |
Multi-State |
This property indicates the last diagnostic detected by the chiller. This is not necessarily an active diagnostic. |
|
Diag: Man Reset Reqd: CKT1 |
Binary |
This property indicates a diagnostic on Circuit 1 that takes the chiller offline. Reset can be done at the chiller front panel. 1=ACTIVE |
|
Diag: Man Reset Reqd: CKT2 |
Binary |
This property indicates a diagnostic on Circuit 2 that takes the chiller offline. Reset can be done at the chiller front panel. 1=ACTIVE |
|
Diag: Manual Reset Required |
Binary |
This property indicates a diagnostic that takes the chiller offline. Reset can be done at the chiller front panel. 1=ACTIVE |
|
Evap Saturated Refrig Press CKT1 |
Numeric |
This property indicates the evaporator refrigerant temperature on Circuit 1 converted to an R-22 pressure. Units are PSIG (Kilopascal gauge) referenced to sea level (14.6960 psia or 101.3289KPa absolute). |
|
Evap Saturated Refrig Press CKT2 |
Numeric |
This property indicates the evaporator refrigerant temperature on Circuit 2 converted to an R-22 pressure. Units are PSIG (Kilopascal gauge) referenced to sea level (14.6960 psia or 101.3289KPa absolute). |
|
Evap Saturated Refrig Temp: CKT1 |
Numeric |
This property indicates the refrigerant temperature measured on the discharge side of the evaporator on Circuit 1. |
|
Evap Saturated Refrig Temp: CKT2 |
Numeric |
This property indicates the refrigerant temperature measured on the discharge side of the evaporator on Circuit 2. |
|
FP Chiller Switch Position |
Multi-State |
This property indicates the position of the chiller switch on the front of the chiller UCM. It indicates whether the Tracer is in control of the chiller (Auto/Remote), if the UCM is in control of the chiller (Auto/Local), or if the chiller is stopped (Stop/Reset). |
|
Ice Making Active |
Binary |
This property enables or disables the unit, when commanded by a contact closure, to run fully loaded and to stop once the ice termination setpoint has been reached (i.e., ice storage applications). 1=MAKING ICE |
|
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 be used for the ice making request. |
|
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 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 to define the ice termination setpoint. |
|
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 (-2.8C). |
|
Last Control Date Time |
Date/Time Numeric |
This indicates the date and time when the present value property of this object was last controlled. |
|
Lead Lag Selection |
Binary |
This property indicates the active status of the binary output that indicates if the Auto Lead/Lag feature of the chiller has been selected. When enabled, the chiller will start the compressor with the fewest starts and stop the compressor with the greatest hours, as determined by the "Compressor Starts" accumulator and the "Compressor Hours". This will tend to balance out hours and starts equally over all compressors. For efficiency improvement, when there are 2 compressors operating, they will be on opposite circuits. (1=ENABLED, 0=DISABLED) |
|
Maximum Capacity |
Binary |
This property indicates whether the running compressors are running at their maximum capacity. It is the time that the chiller will bring another compressor online if it has one. 1=MAXIMUM CAPACITY |
|
Minimum Off Time |
Numeric |
This property provides access to the minimum off time assigned to the chiller. This value serves to protect the hardware from cycle times which might harm the hardware. |
|
Minimum On Time |
Numeric |
This property provides access to the minimum on time assigned to the chiller. This value serves to protect the hardware from cycle times which might harm the hardware. |
|
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 chiller. PUTS are also allowed so that an operator can intervene on a Minimum On/Off control action that is in progress. |
|
Night Noise Setback Selection |
Binary |
This property indicates the active status of a binary output that enables or disables the night noise setback feature. 1=ENABLED, 2=DISABLED. |
|
Night Noise Setback Status |
Binary |
This property indicates when the chiller is in the night noise setback mode. 1=ON, 0=OFF. |
|
Object Identifier |
Object ID |
This property is a data packet containing an object type specifier provided primarily to allow the embedding of the object ID in the returned data buffer. The unique hexadecimal ID of this object. This ID is used internally to identify the object. |
|
Object Type |
Object Type |
This property indicates the objects type (i.e., analog input, binary input, TCM, PCM, etc.). |
|
Operating Mode: Unit |
Multi-State |
This property indicates the active operating mode of the chiller (or the last operating mode if a diagnostic is active). Possibilities include: UCM Power Off, UCM Power Up, Unit Stop, Auto-Local, Auto-Remote, Service Pumpdown, Unit Restart Inhibit, Unit Start, Run: Normal, Run: Current Limit, Run: Condenser Limit, Run: Evaporator Limit, Run: Unload, Reset, External Unit Stop, Ice Building Complete, EXV Test, Ice Building: Normal, Ice Building: Condenser Limit, Ice Building: Evaporator Limit, Low Ambient Run Inhibit. |
|
Outdoor Air Temperature: Active |
Numeric |
This property indicates the active ambient outdoor air temperature (as measured by an outdoor temperature sensor) being used by the chiller. |
|
Over Under Volt Protect Select |
Binary |
This property indicates the active status of the binary output that enables or disables the optional over/under voltage protection feature, if installed. 1=ENABLED, 0=DISABLED. |
|
Phase Imbalance Limit Selection |
Binary |
This property indicates the active status of a binary output that enables or disables the phase imbalance protection feature. The chiller monitors the current in each phase and calculates the percentage of imbalance. If this feature is enabled, and the average three phase current is greater than 80% RLA, and the percent of imbalance is calculated to exceed 15%, the chiller will shutdown the compressor and a diagnostic will be generated. In addition to the 15% criteria, the UCM has a non-defeatable 30% criteria which has its own diagnostic. If the 15% criteria is enabled, it will always display the 15% diagnostic first. The 30% criteria is always active when a compressor is running, regardless of % RLA. 1=ENABLED, 0=DISABLED. |
|
Phase Reversal Protect Selection |
Binary |
This property indicates the active status of a binary output that enables or disables the phase reversal protection feature. The chiller monitors incoming current during start-up and will shutdown the compressor within one second, if phase reversal is detected. 1=ENABLED, 0=DISABLED. |
|
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. |
|
Reduced Inrush Starting Select |
Binary |
This property indicates the active status of the binary output that controls whether the chiller is set for across-the-line or Wye-Delta wiring. 1=ENABLED, 0=DISABLED. |
|
Software Rev Chiller Module |
Numeric |
This property indicates the active software revision level for the Chiller Module in the chiller. |
|
Software Rev Compressor A Module |
Numeric |
This property indicates the active software revision level for the Compressor A Module in the chiller. |
|
Software Rev Compressor B Module |
Numeric |
This property indicates the active software revision level for the Compressor B Module in the chiller. |
|
Software Rev Compressor C Module |
Numeric |
This property indicates the active software revision level for the Compressor C Module in the chiller. |
|
Software Rev Compressor D Module |
Numeric |
This property indicates the active software revision level for the Compressor D Module in the chiller. |
|
Software Rev EXV Module |
Numeric |
This property indicates the active software revision level for the Electronic Expansion Valve (EXV) Module in the chiller. |
|
Software Rev Options Module |
Numeric |
This property indicates the active software revision level for the Options Module in the chiller. |
|
Tracer Temperature Sensor |
Numeric |
This property indicates the value of an analog input on the chiller which can be used to measure any miscellaneous analog property. |
|
Unit Configuration |
Multi-State |
This property indicates the unit type and tonnage range within this group of Helical Rotary chillers. Possibilities include: 0=RTAA 340-400 Tons, 1=RTAA 240-300 Tons, 2=RTAA 130-215 Tons, 3=RTAA 70-125 Tons, 4=RTWA 70-125 Tons. |
|
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.. |
|
Zone Temperature |
Numeric |
This property represents the air temperature being measured by the zone temperature sensor. This variable is used in the chilled water reset algorithm in the chiller UCM. As an option, the UCM will reset the chilled water temperature setpoint based on the zone air temperature, return water temperature, or outdoor air temperature. |