Centrifugal Chiller (UCP2)

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.

Aux/Heat Recovery Temp: Delta

Numeric

The chiller may have either an auxiliary condenser or a heat recovery condenser (but not both). If one of these optional condensers is installed on the chiller, this property calculates the difference between the water temperature entering and leaving the condenser by subtracting the Aux/Heat Recovery Temp: Entering value from the Aux/Heat Recovery Temp: Leaving value.

Aux/Heat Recovery Temp: Entering

Numeric

The chiller may have either an auxiliary condenser or a heat recovery condenser (but not both). If one of these optional condensers is installed on the chiller, this property indicates the water temperature entering the condenser.

Aux/Heat Recovery Temp: Leaving

Numeric

The chiller may have either an auxiliary condenser or a heat recovery condenser (but not both). If one of these optional condensers is installed on the chiller, this property indicates the water temperature leaving the condenser.

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 Tracer’s 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 enable the base loading function.

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 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 property indicates 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 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, 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: 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

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

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.

Compressor Avg Line Voltage

Numeric

This property indicates the average of the three values obtained from the Compressor Phase Voltage property.

Compressor Bearing Temp [1-2]

Numeric

This array is the active value of the motor bearing temperature inputs on the UCP2.

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 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.

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).

Compressor Phase Voltage [1-3]

Numeric

This property indicates the voltage for each power input into the compressor (there are 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 Power Factor

Numeric

This property is measured at the UCP2, expressed in percent, and is used in the formula which calculates the power in KW.

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 Speed: Hertz

Numeric

The indicates the compressor speed in Hertz.

Compressor Speed: RPM

Numeric

The indicates the compressor speed in Revolutions per Minute.

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 Temp: Leaving and Condenser Saturated Refrigerant Temperature properties.

Condenser Fan Status[1-3]

Binary

This property indicates the active status of fans on the condenser on each circuit (1-3).

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. It measures the refrigerant temperature on the discharge side of the condenser.

Condenser Water Flow Rate

Numeric

This property indicates in gallons per minute (gpm) the rate of water flow through the condenser.

Condenser Water Flow Status

Binary

This is the status of the condenser water flow switch input on the UCP2.

Condenser Water Press: Delta

Numeric

This is the pressure drop (psig) across the condenser of the fluid flowing through the condenser. Calculated by subtracting the Condenser Water Pressure: Entering value from the Condenser Water Pressure: Leaving value.

Condenser Water Press: Entering

Numeric

This property indicates the value (measured in psig) for the pressure of the water entering the condenser.

Condenser Water Press: Leaving

Numeric

This property indicates the value (measured in psig) for the pressure of the water leaving the condenser.

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. This 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.

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.

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. 0=None Detected, 1=Active

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 or the UCM Editor. 0=None Detected, 1=ActiveNote: 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).

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.

Free Cooling Request: External

Binary

This property indicates active status of a binary input on the UCP2 which allows an external device to control the chiller to the free cooling mode.

Free Cooling 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 free cooling.

Free Cooling Request: Tracer

Binary

This property is used to control the Free Cooling mode of the chiller Auto (1) or Off(0) from the Tracer. Default: Off.

Free Cooling Status

Binary

This property indicates the active operating status of the free cooling mode.

Head Relief Request

Binary

This property indicates the status of the binary output on whether 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.

Hot Gas Bypass 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 hot gas bypass function.

Hot Gas Bypass Request: Tracer

Binary

This property is used to Enable/Auto (1) or Disable/Off (0) the Hot Gas Bypass mode of the chiller from the Tracer. Default: Enable/Auto.

Hot Gas Bypass Status

Binary

This property indicates the active status of the hot gas bypass mode. 1=ENABLED, 2=DISABLED.

Hot Gas Bypass Time

Numeric

This property indicates the accumulated time that the chiller has been in the hot gas bypass mode since the UCP2 was installed.

Hot Gas Bypass Time CLD

Numeric

This property indicates the accumulated time that the chiller has been in the hot gas bypass mode since the UCP2 was installed.

Hot Water Control Req: 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 Hot Water control mode.

Hot Water Control Reqst: Tracer

Binary

This property indicates the value used to put the chiller into the Hot Water Control (0) or Normal Cooling (1) mode from the Tracer. Default: Normal Cooling.

Hot Water Control Request: Ref

Binary

This property indicates the value to be used by the BCU to determine whether to put the chiller into the Hot Water Control (0) or Normal Cooling (1) mode from the Tracer. Default: Normal Cooling.

Hot Water Control Status

Binary

This property indicates the active operating status of the Hot Water control mode.

Hot Water Setpoint: Active

Numeric

When the chiller is in the Hot Water control mode, this property indicates the value to which the chiller is actively controlling the leaving condenser water temperature.

Hot Water Setpoint: External

Numeric

This property indicates the value of an analog input to the UCP2 from an external device that can define the Hot Water Setpoint.

Hot 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 hot water setpoint.

Hot Water Setpoint: Source

Multi-State

This property indicates from which source the Hot Water Setpoint: Active is receiving its input. The different sources available for input are: front panel, external, Tracer.

Hot Water Setpoint: Tracer

Numeric

The Hot Water Setpoint is used in the Hot Water Control Mode. Units: F or C. Range: 80 to 125 F (26.7 to 51.7 C). Default: 90 F (32.2 C).

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 control the ice making mode.

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 Tracers 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 Smart-Mode processing, so, this property is just used to store the desired control mode for diagnostic purposes.

IGV Control Request: External

Binary

This property indicates the active status of a binary input on the UCP2 which allows an external device to request control of the inlet guide vanes.

IGV Position Request: External

Binary

This property indicates the active status of a binary input on the UCP2 which allows an external device to request the position of the inlet guide vanes.

Inlet Guide Vanes Position (%)

Numeric

This property indicates the active status (in % open) of the compressor inlet guide vanes.

Inlet Guide Vanes Position (deg)

Numeric

This property indicates the active status (in degrees) of the compressor inlet guide vanes.

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 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 Type

Object Type

This property indicates the objects type (i.e., analog input, binary input, TCM, PCM, etc.).

Oil Pressure: Differential

Numeric

This property indicates pressure differential sensed across the oil pump and filter using gauge pressure transducers before the pump and after the filter.

Oil Pressure: High Side

Numeric

This property indicates pressure sensed by the gauge pressure transducer before the oil pump.

Oil Pressure: Low Side

Numeric

This property indicates pressure sensed by the gauge pressure transducer after the oil filter.

Oil Pump Output

Numeric

This property indicates the active status of a binary output on the UCP2 which enables and disables the oil pump.

Oil Temperature

Multi-State

This property indicates the value of the oil sump temperature as measured by the UCP2.

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

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 Centrifugal Chiller ID number. (see also Current Product Revision)

Purge Compressor Running

Binary

This property indicates the active status (ON or OFF) of the Purge Unit compressor.

Purge Liquid Level

Binary

This property is a binary input used to indicate the presence of a high level of liquid refrigerant in the primary purge tank.

Purge Pumpout Running

Binary

This property indicates the active status of the purge pump used to pump air out of the primary purge tank and into the chiller vent line or the supercharger tank.

Purge Service Pumpout

Binary

This property indicates the active status of a binary input to the UCP2 which monitors the position of the purge service pumpout switch.

Purge Status

Multi-State

This property indicates the active operating mode of the Purge unit. The operating modes are: Idle, Running, Low Temperature Pumpout, Low Temperature Inhibited Pumpout, Service Pumpout, or Pumpout Max Rate Disabled.

Purge Suction Temperature

Numeric

This is the temperature of the refrigerant entering the refrigerant compressor. This value is used to initiate and terminate the pumpout cycle.

Purge: 30 Day Chlr OFF Pump CLD

Numeric

This property stores the amount of time (for the most recent 30 days) that the purge pumpout runs while the chiller is OFF (only measures pumpout run time beyond the first three hours after chiller shutdown).

Purge: 30 Day Chlr OFF Pumpout

Numeric

This property stores the amount of time (for the most recent 30 days) that the purge pumpout runs while the chiller is OFF (only measures pumpout run time beyond the first three hours after chiller shutdown).

Purge: 30 Day Chlr ON Pump CLD

Numeric

This property stores the amount of time (for the most recent 30 days) that the purge pumpout runs while the chiller is ON.

Purge: 30 Day Chlr ON Pumpout

Numeric

This property stores the amount of time (for the most recent 30 days) that the purge pumpout runs while the chiller is ON.

Purge: 30 Day Chlr Run Time

Numeric

This property is the summation of chiller run time for the most recent 30 days (in hours) divided by the number of days of available data.

Purge: 30 Day Chlr Run Time CLD

Numeric

This property is the summation of chiller run time for the most recent 30 days (in hours) divided by the number of days of available data.

Purge: 30 Day Pumpout Average

Numeric

This property stores the average of the sums from the 30 Day Chiller OFF Pumpout, the 30 Day Chiller ON Pumpout, and the 30 Day Chiller Run Time values.

Purge: 30 Day Pumpout Avg. CLD

Numeric

This property stores the average of the sums from the 30 Day Chiller OFF Pumpout, the 30 Day Chiller ON Pumpout, and the 30 Day Chiller Run Time values.

Purge: Adap Cyc Tim OFF Mode CLD

Numeric

This property indicates a calculated value (based on purge runtime history) that defines the maximum duration between purge cycles when the chiller is not running for extended periods of time. Available when the purge unit is in the adaptive mode.

Purge: Adapt Cyc Tim OFF Mode

Numeric

This property indicates a calculated value (based on purge runtime history) that defines the maximum duration between purge cycles when the chiller is not running for extended periods of time. Available when the purge unit is in the adaptive mode.

Purge: Adap Cyc Time ON Mode CLD

Numeric

This property indicates a calculated value (based on purge runtime history) that defines the maximum duration between purge cycles when the chiller is running. Available when the purge unit is in the adaptive mode.

Purge: Adapt Cyc Time ON Mode

Numeric

This property indicates a calculated value (based on purge runtime history) that defines the maximum duration between purge cycles when the chiller is running. Available when the purge unit is in the adaptive mode.

Purge: Adaptive Cycle Timer

Numeric

This property indicates the amount of time remaining before the next purge cycle is initiated. Available when the purge unit is in the adaptive mode.

Purge: Average OFF Cycle Time

Numeric

This property indicates the average time required for the pumpout cycle during periods when the chiller is OFF for extended periods of time.

Purge: Average OFF Cycle Time CLD

Numeric

This property indicates the average time required for the pumpout cycle during periods when the chiller is OFF for extended periods of time.

Purge: Days Since Last Reset

Numeric

This property indicates the accumulated days since the last reset request from the purge human interface on the chiller.

Purge: Liquid Temperature

Numeric

This property indicates the active temperature of the liquid refrigerant in the chiller.

Purge: Pumpout Rate

Numeric

This property indicates the total pumpout time for the previous 24 hours.

Purge: Pumpout Time Since Reset CLD

Numeric

This property indicates the accumulated pumpout time since the last reset request from the purge human interface on the chiller.

Purge: Pumpout Time Since Reset

Numeric

This property indicates the accumulated pumpout time since the last reset request from the purge human interface on the chiller.

Purge: Run Time Total

Numeric

This property indicates the total accumulated run time for the purge unit over its lifetime.

Purge: Run Time Total CLD

Numeric

This property indicates the total accumulated run time for the purge unit over its lifetime.

Purge: Time to Next Run

Numeric

This property indicates the amount of time remaining before the next purge cycle begins.

Purge: Time to Next Run CLD

Numeric

This property indicates the amount of time remaining before the next purge cycle begins.

Purge: Total Pumpout Time

Numeric

This property indicates the total accumulated pumpout time for the purge unit over its lifetime.

Purge: Total Pumpout Time CLD

Numeric

This property indicates the total accumulated pumpout time for the purge unit over its lifetime.

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.

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

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.

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.