| Property | Type | Description |
| Absorber Water Flow Rate | Numeric | This is the rate of cooling water flow through the absorber measured in gallons per minute (gpm) (Same value as Condenser Water Flow Rate) |
| Absorber Water Flow Status | Binary | This is the status of the condenser/absorber water flow switch input on the UCP2. (Same value as Condenser Water Flow Status). |
| Absorber Water Press: Delta | Numeric | This is the total water pressure drop across the absorber and the condenser which are piped in series. (Same value as Condenser Water Pressure: Delta) |
| Absorber Water Press: Entering | Numeric | This is the active pressure value (measured in psig) of the water flowing into the absorber. (Same value as Condenser Water Pressure: Entering) |
| Absorber Water Press: Leaving | Numeric | This is the active pressure value (measured in psig) of the water flowing out of the condenser. (Same value as Condenser Water Pressure: Leaving) |
| Absorber Water Pump Output | Binary | This is the active status of a binary output on the UCP2, which is used to turn the absorber/condenser water pump ON and OFF. (Same value as Condenser Water Pump Output) |
| Absorber Water Temp: Delta | Numeric | This is the temperature change across the absorber of the fluid (usually water) flowing through the absorber. This value is calculated by subtracting the absorber Water Temperature: Entering value from the Absorber Water Temperature: Leaving value. |
| Absorber Water Temp: Entering | Numeric | This is the temperature of the water entering the Absorber. |
| Absorber Water Temp: Leaving | Numeric | This is the temperature of the water leaving the Absorber. (Same value as Condenser Water Temp: Entering). |
| 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 binary output for alarms on the UCP2. |
| Base Load Ch Wtr Setpt: Ref | Numeric | This is the value to be used by the BCU to determine which value to communicate to the UCM as the base loading chilled water setpoint. |
| Base Load Ch Wtr Setpt: Tracer | Numeric | This property is the Tracers request for a base load chilled water setpoint. It will be used as a chilled water 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: F or C. Range: 38 to 60 F (3.3 to 15.5 C). Default: 44 F (6.7 C). |
| Base Loading Request: Ref | Property Reference | This is 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 is the active operating status of the Base Loading mode. |
| Chilled Water Flow Rate | Numeric | This is the rate of fluid flow through the evaporator measured in gallons per minute (gpm). |
| Chilled Water Flow Status | Binary | This is the status of the chilled water flow switch input on the UCP2. |
| Chilled Water Pressure: Delta | Numeric | This is the pressure drop across the evaporator of the fluid flowing through the evaporator. Calculated by subtracting the Chilled Water Pressure: Entering value from the Chilled Water Pressure: Leaving value. |
| Chilled Water Pressure: Entering | Numeric | This property indicates the value (measured in psig) for the pressure of the fluid entering the evaporator. |
| Chilled Water Pressure: Leaving | Numeric | This is the value (measured in psig) for the pressure of the fluid leaving the evaporator. |
| 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 is 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 is the value being received from that external analog input. |
| Chilled Water Setpoint: Ref | Property Reference | This is 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 The available sources are: front panel, external, and Tracer. |
| 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: 38 to 60 F (3.3 to 15.5 C). Default: 44 F (6.7 C). |
| 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 is the value of the temperature of the fluid entering the evaporator. |
| Chilled Water Temp: Leaving | Numeric | This is the value of the temperature of the fluid leaving the evaporator. |
| Chilled Wtr Pump Request: Ref | Property Reference | This is 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 | Binary | This is the active operating status of the Chiller mode |
| Communication Address | Numeric | This property provides access to the assigned communications address value of the UCM being represented. |
| 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 UCM being represented. |
| 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 UCM hardware |
| Communication State | Binary | This property indicates the status of communications between the BCU and the UCM. 0 = Down, 1 = Up |
| Cond Water Pump Request: Ref | Property Reference | This is 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 Temp: Leaving and Condenser Saturated Refrigerant Temperature properties |
| Condenser Saturated Refrig Temp | Binary | This is the active status of the condenser refrigerant temperature input on the UCP2. |
| Condenser Water Flow Rate | Numeric | This is in gallons per minute (gpm) the rate of water flow through the condenser. (Same value as Absorber Water Flow Rate). |
| Condenser Water Flow Status | Binary | This is the status of the water flow switch input on the UCP2. (Same value as Absorber Water Flow Status) |
| Condenser Water Press: Delta | Numeric | This is the total water pressure drop across the absorber and condenser which are piped in series. (Same value as Absorber Water Pressure: Delta) |
| Condenser Water Press: Entering | Numeric | This is the value (measured in psig) of the pressure of the water entering the absorber. Note: The absorber and condenser are piped in series. (Same value as Absorber Water Pressure: Entering) |
| Condenser Water Press: Leaving | Numeric | This is the value (measured in psig) of the pressure of the water leaving the condenser. Note: The absorber and the condenser are piped in series. (Same value as Absorber Water Pressure: Leaving) |
| Condenser Water Pump Output | Binary | This is the active status of the binary output on the UCP2 used to control the absorber/condenser water pump ON and OFF. (Same value as Absorber Water Pump Output) |
| Condenser Water Temp: Delta | Numeric | This is the temperature change across the condenser of the fluid (usually water) flowing through the condenser. This value is 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. (Same value as Absorber Water Temp: Leaving). |
| 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 controlled. |
| Diag: Automatic Reset | Binary | This property indicates that a diagnostic exists which takes part or all of the chiller off-line. 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 off-line until a reset is initiated. Reset can be initiated at the chiller front panel. 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[1–20] | Multi-State | This property indicates the last twenty diagnostics to occur. Array of 20 enumerations |
| Diagnostic Date/Time Stamp Hist[1–20] | Date/Time Numeric | Array of 20 date/time values (integer containing a value representing seconds past midnight of Jan 1st, 1980) |
| Dilute Soln Temp Lvg Absorber | Numeric | This property indicates the active temperature of the water/lithium-bromide solution leaving the absorber. |
| Dilute Solution Temp Ent HTG | Numeric | This property indicates the active temperature of the water/lithium-bromide solution entering the high temperature generator. This applies to 2-stage absorption chillers only. |
| Dilute Solution Temp Lvg HTHX | Numeric | This property indicates the active temperature of the water/lithium-bromide solution leaving the high temperature heat exchanger. This applies to 2-stage absorption chillers only. |
| Dilute Solution Temp Lvg LTHX | Numeric | This property indicates the active temperature of the water/lithium-bromide solution leaving the low temperature heat exchanger. This applies to 2-stage absorption chillers only. |
| Economizer #1: Valve Position | Numeric | This property indicates the active status (in % open) of the stepper motor that controls the valve on the primary economizer. |
| Economizer #2: Valve Position | Numeric | This property indicates the active status (in % open) of the stepper motor that controls the valve on the secondary economizer. |
| 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. |
| Energy Valve Motor Position | Numeric | This property indicates the active status (in % open) of the motor that controls the valve in line to the generator (hot water or steam). |
| 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 Temp | Numeric | This property indicates the refrigerant temperature measured on the discharge side of the evaporator. |
| Generator Hot Water Temp: Ent | Numeric | This property indicates the active temperature of the hot water entering the generator. This property applies to single-stage, hot water absorption chillers only. |
| Generator Hot Water Temp: Lvg | Numeric | This property indicates the active temperature of the hot water leaving the generator. This property applies to single-stage, hot water absorption chillers only. |
| Head Relief Request | Binary | This property indicates the status of the binary output on the UCP2 which indicates a 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. |
| 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. |
| Interstage Solution Temp Ent LTG | Numeric | This property indicates the temperature of the interstage water/lithium-bromide solution as it enters the low temperature generator (LTG). This property applies to 2-stage absorption chillers only. |
| Interstage Solution Temp Lvg HTG | Numeric | This property indicates the temperature of the interstage water/lithium-bromide solution as it leaves the high temperature generator (HTG). This property applies to 2-stage absorption chillers only. |
| Interstage Vapor Pressure | Numeric | This property indicates the pressure (measured in psig) of the water vapor driving the second stage. This property applies to 2-stage absorption chillers only. |
| Intmd Temp at Absorber Spray | Numeric | This property indicates the temperature of the intermediate water/lithium-bromide solution at the absorber spray tree. |
| Last Control Date Time | Date/Time Numeric | This indicates the date and time when the present value property of this object was last controlled. |
| LiBr Crystallization Temp | Numeric | This property indicates the temperature at which the water/lithium-bromide solution will crystallize in the chiller. This value is calculated as part of the crystallization protection algorithm. |
| Limit Warning Output | Binary | This property indicates the active status of a binary output on the chiller 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 output on the chiller 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 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 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 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 | 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 Name | Character | This is the name assigned to the object. Range: Up to 32 characters. |
| Object Type | Object Type | This property indicates the objects type (i.e., analog input, binary input, TCM, PCM, etc.). |
| 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 value. |
| 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 its local sensor for these functions. Units: F or C. Range: -100 to 150 F (73.3 to 65.6 C). |
| PCL Switch Status | Binary | This property indicates the active status of the binary input that is part of the PCL routine algorithm. Typically, when this switch is OPEN the lithium-bromide solution concentration is OK and when this switch is CLOSED, the lithium-bromide solution is crystallizing and requires corrective action. |
| Present Value | Multi-State | 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 Absorption Chiller ID number. (see also Current Product Revision) |
| Purge Pump Running Time | Numeric | This property indicates a value that represents the accumulated running time of the purge pump over the lifetime of the chiller. |
| Purge Pump Running Time CLD | Date/Time Numeric | This property indicates a value that represents the accumulated running time of the purge pump over the lifetime of the chiller. |
| Purge Pump Starts | Numeric | This property indicates a value that represents the accumulated number of times the purge pump has been started over the lifetime of the chiller. |
| Purge Status | Binary | This property indicates the active mode of a binary input that controls the purge pump. |
| Purge: Last Occurrence | Date/Time Numeric | This property indicates the time and date of the last purge cycle. |
| Refrigerant Flow Status | Binary | This property indicates the active status of a binary input that monitors the flow (YES or NO) of water (the refrigerant) in the absorption chiller. |
| Refrigerant Type | Multi-State | This property indicates the type of refrigerant being used in the absorption chiller. This will always be 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 | Date/Time Numeric | This property indicates the amount of time that must elapse before the UCP2 will allow the compressor to start. This property is not implemented for Tracer Summit Version 2. |
| Security Class | BitString | Contains security class setup for this object. |
| Solution Pump Avg Line Voltage | Numeric | This property indicates the average of the three values obtained from the Solution Pump Phase Voltage property array. |
| Solution Pump Current Draw | Numeric | This property indicates the percent of the maximum rated load amps (%RLA) the solution pump is actively drawing (calculated based on the average of the three values obtained from the Solution Pump Phase Current Draw property array). |
| Solution Pump Current Imbalance | Numeric | This property indicates whether there is a current imbalance based on calculations using the three values for the Solution Pump Phase Current Draw property. |
| Solution Pump 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. |
| Solution Pump Phase Voltage [1–3] | Numeric | This property indicates the voltage for each power input into the Solution pump (there are three). Array of three. |
| Solution Pump 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. |
| Solution Pump Power Factor | Numeric | This property is measured at the UCP2, expressed in percent, and is used in the formula which calculates the power consumption in KW. |
| Solution Pump Run Status | Binary | This property indicates the active mode of a binary output on the UCP2 that controls the solution pump ON and OFF. |
| Solution Pump Run Time CLD | Numeric | This property indicates the accumulated run time of the solution pump since the UCP2 was installed. |
| Solution Pump Starts | Numeric | This property indicates the accumulated number of times the solution pump has been started since the UCP2 was installed. |
| Solution Pump 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 Solution Pump Phase Voltage property. |
| Steam Condensate Temp Lvg CHX | Numeric | This property indicates the temperature of the condensate leaving the condensate heat exchanger. This property applies to two-stage, steam absorption chillers only. |
| Steam Condensate Temp Lvg LTG | Numeric | This property indicates the temperature of the condensate leaving the low temperature generator. This property applies to one-stage, steam absorption chillers only. |
| Strong Soln Concentration (LiBr) | Numeric | This property indicates the concentration (in % lithium-bromide) of the strong lithium-bromide solution. |
| Strong Soln Temp Lvg LTG | Numeric | This property indicates the temperature of the strong water/lithium-bromide solution leaving the low temperature generator. |
| Strong Soln Temp Lvg LTHX | Numeric | This property indicates the temperature of the strong water/lithium-bromide solution leaving the low temperature heat exchanger. |
| Tons: Active | Numeric | This property indicates the active cooling capacity in tons being produced by the chiller, as calculated by the UCP2. |
| Tracer Comm Packet Revision | Numeric | This property indicates the active software revision level for the various modules in the UCP2. |
| Tracer Controlled Relay: Ref | Binary | This property indicates the active status of a binary output on the options module in the UCP2 used for Tracer control. |
| 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 | Value indicating last edit change of this object. |