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Air-cooled screw chiller controller · BACnet points list

Trane Symbio 800 RTAC (CH530) BACnet points list

Updated 28 October 2026

Short answer

A short Symbio 800 list of about 85 objects for RTAC chillers marked CH530, with small instance numbers (AI 1 to AI 98). AIs cover water temperatures, refrigerant and oil pressures, compressor starts, run times and motor currents. The BAS writes chilled water setpoint and current limit (AO), auto/stop and diagnostic reset (BO) and mode (MO).

This page lists 86 BACnet objects for the Trane Symbio 800 RTAC (CH530) — 5 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Trane’s own free documentation, linked below.

Manufacturer
Trane
Model
Symbio 800 RTAC (CH530)
Equipment
Air-cooled screw chiller controller
Equipment type
Chillers
BACnet objects
86 (5 writable)
Transport
BACnet IP, BACnet MS/TP
Firmware
Not stated
Also known as
RTAC, Series R RTAC, RTAC CH530, CH530, BAS-PTS031
Source document
Symbio 800 Integration Points List BACnet - RTAC (CH530) · BAS-PTS031A-EN · rev. 12/6/2024
Download CSV 86 rows Download EDE B.I.G.-EU JSON Manufacturer PDF ↗ Download Easy BACnet Mobile App Google Play

BMS integration notes: Trane Symbio 800 RTAC (CH530)

Integration in brief

Put the chiller on the network (BACnet MS/TP or IP), then write the auto/stop command, chilled water setpoint, current limit and mode. Read back running state, leaving water temperature and capacity. Check the local-setpoint flag to confirm the BAS setpoints are actually in use. The alarm-present flag gives a single summary alarm.

Minimum points to map

The short list most integrators start with — enough to run the unit from a BMS. Map more as the job needs.

ObjectNameWhyAccess
BO 1Chiller Auto Stop CommandBMS auto/stop (enable) commandWrite
MO 1Chiller Mode CommandCool/heat/ice mode commandWrite
AO 1Chilled Water SetpointChilled water setpoint from the BMSWrite
AO 2Current Limit SetpointCurrent (capacity) limit from the BMS, %Write
BI 4Chiller Running StateChiller on/off statusRead
BI 2Local Setpoint ControlShows if local setpoints override BAS setpointsRead
AI 45Evaporator Leaving Water TempLeaving chilled water temperatureRead
AI 5Actual Running CapacityActual running capacity in percentRead
BI 23Alarm PresentAny active alarm on the chillerRead

Enable & remote start

BO 1 Chiller Auto Stop Command (Inactive = Stop, Active = Auto) is the BMS auto/stop; its relinquish default is True (Auto). BI 1 Run Enabled shows whether the chiller is available to run. The document doesn't say how to hand setpoint control to the BAS; BI 2 Local Setpoint Control shows when the chiller is using local setpoints instead of BAS setpoints.

Network setup

Watch out for

Trane Symbio 800 RTAC (CH530) BACnet objects

Type: AI, AO, AV, BI, BO, BV, MI/MO/MV (multi-state) · Access: Read read-only, Write writable, Command writable with a priority array.

Note: the source document has no read/write column, so access here is inferred from the object type (inputs read-only, values writable). Confirm on the live controller before writing.

86 of 86 shown
Type
Access
Show
Trane Symbio 800 RTAC (CH530) BACnet Points List
DescriptionStates
AI1Active Cool/Heat Setpoint TemperatureActive chiller water or hot water setpointTemperatureRead
AI2Active Current Limit SetpointActive capacity current limit setpointPercentRead
AImin5Actual Running CapacityLevel of capacity that the chiller is currently running atPercentRead
AI6Evaporator Refrigerant Pressure- Ckt1Circuit 1 evaporator refrigerant pressurePressureRead
AI9Evaporator Refrigerant Pressure- Ckt 2Circuit 2 evaporator refrigerant pressurePressureRead
AI12Evaporator Saturated Refrigerant Temperature- Ckt 1Circuit 2 evaporator refrigerant temperatureTemperatureRead
AI14Evaporator Saturated Refrigerant Temperature- Ckt 2Circuit 2 evaporator refrigerant temperatureTemperatureRead
AI16Condenser Refrigerant Pressure- Ckt 1Circuit 1 condenser refrigerant pressurePressureRead
AI18Condenser Refrigerant Pressure- Ckt 2Circuit 2 condenser refrigerant pressurePressureRead
AI20Condenser Saturated Refrigerant Temperature- Ckt 1Circuit 1 condenser refrigerant temperatureTemperatureRead
AI22Condenser Saturated Refrigerant Temperature- Ckt 2Circuit 2 condenser refrigerant temperatureTemperatureRead
AI25Local Atmospheric PressurePressureRead
AI26Starts- Compressor 1ANumber of starts for compressor 1ARead
AI27Starts- Compressor 1BNumber of starts for compressor 1BRead
AI28Starts- Compressor 2ANumber of starts for compressor 2ARead
AI29Starts- Compressor 2BNumber of starts for compressor 2BRead
AI34Run Time- Compressor 1ATotal run time of compressor 1ATimeRead
AI35Run Time- Compressor 1BTotal run time of compressor 1BTimeRead
AI36Run Time- Compressor 2ATotal run time of compressor 2ATimeRead
AI42Airflow Percentage- Circuit 1Approximate airflow percentage of circuit 1PercentRead
AI43Airflow Percentage- Circuit 2Approximate airflow percentage of circuit 2PercentRead
AI44Evaporator Entering Water TempTemperature of the water entering the evaporatorTemperatureRead
AImin45Evaporator Leaving Water TempTemperature of the water leaving the evaporatorTemperatureRead
AI48High Side Oil Pressure- Compressor 1APressure of the oil at the high side of compressor 1APressureRead
AI49High Side Oil Pressure- Compressor 1BPressure of the oil at the high side of compressor 1BPressureRead
AI50High Side Oil Pressure- Compressor 2APressure of the oil at the high side of compressor 2APressureRead
AI51High Side Oil Pressure- Compressor 2BPressure of the oil at the high side of compressor 2BPressureRead
AI52Oil Temp- Compressor 1ATemperature of the oil in compressor 1ATemperatureRead
AI54Oil Temp- Compressor 2ATemperature of the oil in compressor 2ATemperatureRead
AI55Oil Temp- Compressor 2BTemperature of the oil in compressor 2BTemperatureRead
AI57Outdoor Air TemperatureTemperatureRead
AI59Phase AB Voltage- Compressor 1APhase AB voltage, compressor 1AVoltageRead
AI71Line 1 Current (in Amps)- Compressor 1ACurrentRead
AI72Line 2 Current (in Amps)- Compressor 1ACurrentRead
AI73Line 3 Current (in Amps)- Compressor 1ACurrentRead
AI74Line 1 Current (in Amps)- Compressor 1BCurrentRead
AI75Line 2 Current (in Amps)- Compressor 1BCurrentRead
AI76Line 3 Current (in Amps)- Compressor 1BCurrentRead
AI77Line 1 Current (in Amps)- Compressor 2ACurrentRead
AI78Line 2 Current (in Amps)- Compressor 2ACurrentRead
AI79Line 3 Current (in Amps)- Compressor 2ACurrentRead
AI80Line 1 Current (in Amps)- Compressor 2BCurrentRead
AI81Line 2 Current (in Amps)- Compressor 2BCurrentRead
AI82Line 3 Current (in Amps)- Compressor 2BCurrentRead
AI83Line 1 Current (%RLA)- Compressor 1APercentRead
AI84Line 2 Current (%RLA)- Compressor 1APercentRead
AI85Line 3 Current (%RLA)- Compressor 1APercentRead
AI86Line 1 Current (%RLA)- Compressor 1BPercentRead
AI87Line 2 Current (%RLA)- Compressor 1BPercentRead
AI88Line 3 Current (%RLA)- Compressor 1BPercentRead
AI89Line 1 Current (%RLA)- Compressor 2APercentRead
AI90Line 2 Current (%RLA)- Compressor 2APercentRead
AI91Line 3 Current (%RLA)- Compressor 2APercentRead
AI92Line 1 Current (%RLA)- Compressor 2BPercentRead
AI93Line 2 Current (%RLA)- Compressor 2BPercentRead
AI94Line 3 Current (%RLA)- Compressor 2BPercentRead
AI95Number of CircuitsRead
AI96Number of Compressors, Ckt 1Read
AI97Number of Compressors, Ckt 2Read
AI98Chiller Design CapacityDesign Capacity of the ChillerRead
AOmin1Chilled Water SetpointDesired leaving water temperature if chiller is in cooling modeTemperatureWrite
AOmin2Current Limit SetpointSets the maximum capacity that the chiller can usePercentWrite
BI1Run EnabledThe chiller is available to run or is currently runningReadInactive = Stop, Active = Auto
BImin2Local Setpoint ControlThe chiller is being controlled by local setpoints instead of BAS setpointsReadInactive = Remote Control, Active = Local Control
BI3Capacity LimitedConditions may exist that prevent the chiller from reaching setpointReadInactive = Not Limited, Active = Limited
BImin4Chiller Running StateThe chiller is running or stoppedReadInactive = Off, Active = On
BI6Maximum CapacityAll available chiller capacity is being usedReadInactive = Off, Active = On
BI9Compressor 1A RunningCompressor 1A is runningReadInactive = Off, Active = Running
BI10Compressor 1B RunningCompressor 1B is runningReadInactive = Off, Active = Running
BI11Compressor 2A RunningCompressor 2A is runningReadInactive = Off, Active = Running
BI12Compressor 2B RunningCompressor 2B is runningReadInactive = Off, Active = Running
BI17Evaporator Water Pump RequestRequest from the chiller to turn on the evaporator water pumpReadInactive = Off, Active = On
BI22Evaporator Water Flow StatusWater is flowing through the evaporatorReadInactive = No Flow, Active = Flow
BImin23Alarm PresentAn alarm is activeReadInactive = No Alarm, Active = Alarm
BI24Shutdown Alarm PresentA shutdown alarm is activeReadInactive = No Alarm, Active = None
BI25Last DiagnosticLast diagnostic for the chillerReadInactive = Off, Active = On
BOmin1Chiller Auto Stop CommandAllows the chiller to run if conditions for running are metWriteInactive = Stop, Active = Auto
BO2Remote Diagnostic Reset CommandResets remotely diagnostics that can be resetWriteInactive = No Reset Request, Active = Reset Request
MI1Running ModePrimary running mode of the chillerRead1 = Chiller Off, 2 = Chiller in Start Mode, 3 = Chiller in Run Mode, 4 = Chiller in Pre-shutdown Mode, 5 = Chiller in Service Mode
MI2Operating ModePrimary operating mode of the chillerRead1 = HVAC_Cool, 2 = HVAC_Heat, 3 = HVAC_Ice (a), 4 = Not Used
MI3MP Communication StatusDo Not Use This PointRead
MI4Refrigerant TypeRead1 = R-11, 2 = R-12, 3 = R-22, 4 = R-123, 5 = R-134A, 6 = R407C, 7 = R-410A, 8 = R-113, 9 = R-114, 10 = R-500, 11 = R-502, 12 = R-404A, 13 = R-513A
MI5Model InformationModel type of the chillerRead1 = RTA, 2 = CVH, 3 = CVG, 4 = CVR, 5 = CDH, 6 = RTH, 7 = CGW, 8 = CGA, 9 = CCA, 10 = RTW, 11 = RTX, 12 = RTU, 13 = CCU, 14 = CXA, 15 = CGC, 16 = RAU
MI6Cooling TypeCooling type of the condenserRead1 = Water Cooled, 2 = Air Cooled
MI7Manufacturing LocationLocation where chiller was manufacturedRead1 = Field Applied, 2 = La Crosse, 3 = Pueblo, 4 = Charmes, 5 = Rushville, 6 = Macon, 7 = Waco, 8 = Lexington, 9 = Forsyth, 10 = Clarksville, 11 = Ft. Smith, 12 = Penang, 13 = Colchester, 14 = Curitiba, 15 = Taicang, 16 = Taiwan, 17 = Epinal, 18 = Golbey
MOmin1Chiller Mode CommandMode of operation of the chillerWrite1 = HVAC_Cool, 2 = HVAC_Heat, 3 = HVAC_Ice (a), 4 = Not Used

Integration notes

Check it against the live device. A points list tells you what the controller can expose; the unit in front of you may differ by firmware or installed options. Easy BACnet scans a network for BACnet IP devices from an Android phone, reads every object on the Symbio 800 RTAC (CH530) and exports what it actually has to Excel — free. New to BACnet? Start with what a BACnet points list is and what the object types mean.

Questions about the Trane Symbio 800 RTAC (CH530)

How many BACnet points does the Trane Symbio 800 RTAC (CH530) have?

This list has 86 BACnet objects: 60 analog inputs, 2 analog outputs, 14 binary inputs, 2 binary outputs, 7 multi-state inputs, 1 multi-state output. The exact set on a given unit depends on its firmware, installed options and configuration.

Which Trane Symbio 800 RTAC (CH530) BACnet points are writable?

5 of the 86 objects accept a write. Points marked Command have a priority array: a write holds until it is released, so release it back to automatic when you are done. The source has no read/write column, so this is inferred from object type.

Where is the official Trane Symbio 800 RTAC (CH530) BACnet documentation?

The source is Symbio 800 Integration Points List BACnet - RTAC (CH530) (BAS-PTS031A-EN), revision 12/6/2024, published free by Trane at https://elibrary.tranetechnologies.com/public/commercial-hvac/Literature/Points%20List/BAS-PTS031A-EN_12062024.pdf.

What are the minimum BACnet points to integrate the Trane Symbio 800 RTAC (CH530)?

Start with BO 1 Chiller Auto Stop Command (BMS auto/stop (enable) command); MO 1 Chiller Mode Command (Cool/heat/ice mode command); AO 1 Chilled Water Setpoint (Chilled water setpoint from the BMS); AO 2 Current Limit Setpoint (Current (capacity) limit from the BMS, %); BI 4 Chiller Running State (Chiller on/off status); BI 2 Local Setpoint Control (Shows if local setpoints override BAS setpoints); AI 45 Evaporator Leaving Water Temp (Leaving chilled water temperature); AI 5 Actual Running Capacity (Actual running capacity in percent); BI 23 Alarm Present (Any active alarm on the chiller).

How do I enable BMS control of the Trane Symbio 800 RTAC (CH530)?

BO 1 Chiller Auto Stop Command (Inactive = Stop, Active = Auto) is the BMS auto/stop; its relinquish default is True (Auto). BI 1 Run Enabled shows whether the chiller is available to run. The document doesn't say how to hand setpoint control to the BAS; BI 2 Local Setpoint Control shows when the chiller is using local setpoints instead of BAS setpoints.

How do I check these points on the real Symbio 800 RTAC (CH530)?

Scan the network with a BACnet IP browser such as Easy BACnet, open the device and compare its object list with this table. Anything missing is usually an option that isn't installed or a point that is disabled in the controller's configuration.

More Trane BACnet points lists

Source: Symbio 800 Integration Points List BACnet - RTAC (CH530) · BAS-PTS031A-EN · rev. 12/6/2024. Object names, instances and units are reproduced as published; descriptions are our own.