Easy BACnet
  1. Home
  2. BACnet points lists
  3. Trane
  4. Symbio 800 HDWA (UC800)

Water-cooled centrifugal chiller controller · BACnet points list

Trane Symbio 800 HDWA (UC800) BACnet points list

Updated 28 October 2026

Short answer

This Symbio 800 list for HDWA chillers has about 230 BACnet objects with low instance numbers. Status BIs and diagnostic BIs share one range (BI 1-157), so check the name, not the number range. AIs cover water temperatures and pressures, refrigerant, drive (AFD), bearing and motor data; the BAS writes chilled and hot water setpoints, demand limit, base loading, mode and auto/stop.

This page lists 231 BACnet objects for the Trane Symbio 800 HDWA (UC800) — 8 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 HDWA (UC800)
Equipment
Water-cooled centrifugal chiller controller
Equipment type
Chillers
BACnet objects
231 (8 writable)
Transport
BACnet IP, BACnet MS/TP
Firmware
Not stated
Also known as
HDWA, Agility HDWA, HDWA UC800, Symbio 800 HDWA, BAS-PTS028
Source document
Symbio 800 Integration Points List BACnet - HDWA (UC800) · BAS-PTS028A-EN · rev. 12/6/2024
Download CSV 231 rows Download EDE B.I.G.-EU JSON Manufacturer PDF ↗ Download Easy BACnet Mobile App Google Play

BMS integration notes: Trane Symbio 800 HDWA (UC800)

Integration in brief

Put the chiller on the network (BACnet MS/TP or IP), then write the auto/stop command, chilled water setpoint, demand 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. Most remaining objects are read-only status and per-alarm diagnostic flags.

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
MV 1BAS Chiller Auto Stop CommandBMS auto/stop command (1 = Stop, 2 = Auto)Write
MV 2BAS Chiller Mode CommandCool/heat/ice mode commandWrite
AV 2BAS Chilled Water SetpointChilled water setpoint from the BMSWrite
AV 3BAS Demand Limit SetpointDemand limit from the BMS, % RLAWrite
BI 14Chiller Running StateChiller on/off statusRead
BI 105Local Setpoint ControlShows if local setpoints override BAS setpointsRead
AI 34Evaporator Leaving Water TemperatureLeaving chilled water temperatureRead
AI 20Calculated Chiller CapacityCalculated cooling capacity, kWRead
BI 10Alarm PresentAny active alarm on the chillerRead

Enable & remote start

MV 1 BAS Chiller Auto Stop Command (1 = Stop, 2 = Auto; relinquish default Auto) is the BMS auto/stop; with it at Auto the chiller runs when its own run conditions are met. MI 8 External Auto Stop reports the hardwired external auto/stop input, and BI 139 Run Enable shows whether the chiller is enabled to run. The documents don't say how the two combine or how to hand setpoint control to the BAS; BI 105 Local Setpoint Control shows when the chiller is using local setpoints instead of BAS setpoints, and MI 3 Active Chilled Water Setpoint Source shows Front Panel, External, Ice Machine or BAS.

Heartbeat & communication loss

No timeout or heartbeat is described. The list includes the diagnostic flags BI 11 'BAS Communication Lost', BI 12 'BAS Failed to Establish Communication' and BI 49 'Comm Loss: Local BAS Interface'; the document doesn't say what timeout sets them or what the chiller does when they are set.

Network setup

Watch out for

Trane Symbio 800 HDWA (UC800) 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.

231 of 231 shown
Type
Access
Show
Trane Symbio 800 HDWA (UC800) BACnet Points List
DescriptionStates
AI1Active Base Loading Setpoint%Read
AI3Active Cool/Heat Setpoint Temperature°CRead
AI4Active Demand Limit Setpoint%Read
AI5AFD Average Motor Current % RLA%Read
AI6AFD Calculated Motor VoltageVRead
AI7AFD DC Bus VoltageVRead
AI8AFD Frequency Command%Read
AI9AFD Heatsink Temperature°CRead
AI10AFD Motor Current UAmpsRead
AI11AFD Motor Current U % RLA%Read
AI12AFD Motor Current VAmpsRead
AI13AFD Motor Current V % RLA%Read
AI14AFD Motor Current WAmpsRead
AI15AFD Motor Current W % RLA%Read
AI16AFD Output PowerkWRead
AI17AFD Percent Speed%Read
AI18Approx Cond Water FlowlpmRead
AI19Approx Evap Water FlowlpmRead
AImin20Calculated Chiller CapacitykWRead
AI21Compressor Bearing Temperature 1°CRead
AI22Compressor Bearing Temperature 2°CRead
AI23Compressor Refrigerant Discharge Temperature°CRead
AI24Compressor Running TimeSecsRead
AI25Compressor StartsRead
AI26Cond Differential Wtr PresskPaRead
AI27Condenser Entering Water Temperature°CRead
AI28Condenser Leaving Water Temperature°CRead
AI29Condenser Refrigerant PressurekPaRead
AI30Condenser Saturated Rfgt Temp°CRead
AI31Differential Refrigerant PressurekPaRead
AI32Evap Differential Wtr PresskPaRead
AI33Evaporator Entering Water Temperature°CRead
AImin34Evaporator Leaving Water Temperature°CRead
AI35Evaporator Refrigerant PressurekPaRead
AI36Evaporator Saturated Rfgt Temp°CRead
AI37External Base Loading Setpoint%Read
AI38External Chilled Water Setpoint°CRead
AI39External Demand Limit Setpoint%Read
AI40Front Panel Base Loading Setpoint%Read
AI41Front Panel Chilled Water Setpoint°CRead
AI42Front Panel Demand Limit Setpoint%Read
AI43Front Panel Hot Water Setpoint°CRead
AI44IGV Percent Open%Read
AI45Motor Winding Temp #1°CRead
AI46Motor Winding Temp #2°CRead
AI47Motor Winding Temp #3°CRead
AI48Number of CircuitsRead
AI49Number of Compressors, Circuit 1Read
AI50Number of Compressors, Circuit 2Read
AI51Outdoor Air Temperature°CRead
AI52Refrigerant MonitorppmRead
AI53Unit Power ConsumptionkWRead
AI54AFD Calculated Input VoltageVRead
AI55Condenser Entering Water PressurekPaRead
AI56Condenser Leaving Water PressurekPaRead
AI57Evaporator Entering Water PressurekPaRead
AI58Evaporator Leaving Water PressurekPaRead
AI59Chiller Load Command%Read
AV1BAS Base Loading SetpointRange 20-100%; default 50%Write
AVmin2BAS Chilled Water SetpointRange -17.78° to 23.9°C (0°F to 75°F); default 6.7°C/44°FWrite
AVmin3BAS Demand Limit SetpointRange 20 to 120%; default 100% RLAWrite
AV4BAS Hot Water SetpointRange 80°F to 140°F (26.7°C to 60°C); default 120°F (48.9°C)Write
BI1AFD Comm Loss: Main ProcessorRead0 = Off, 1 = On
BI2AFD Failure to Arm or StartRead0 = Off, 1 = On
BI3AFD FaultRead0 = Off, 1 = On
BI4AFD Ground FaultRead0 = Off, 1 = On
BI5AFD Interrupt FailureRead0 = Off, 1 = On
BI6AFD Mains FailureRead0 = Off, 1 = On
BI7AFD Motor Current OverloadRead0 = Off, 1 = On
BI8AFD Safe StopRead0 = Off, 1 = On
BI9AFD Short CircuitRead0 = Off, 1 = On
BImin10Alarm PresentRead0 = No, 1 = Yes
BI11BAS Communication LostRead0 = Off, 1 = On
BI12BAS Failed to Establish CommunicationRead0 = Off, 1 = On
BI13Base LoadingRead0 = Inactive, 1 = Active
BImin14Chiller Running StateRead0 = No, 1 = Yes
BI15Comm Loss: Adaptive Frequency DriveRead0 = Off, 1 = On
BI16Comm Loss: Chiller % Capacity OutputRead0 = Off, 1 = On
BI17Comm Loss: Cprsr Discharge Rfgt TempRead0 = Off, 1 = On
BI19Comm Loss: Condenser Rfgt PressureRead0 = Off, 1 = On
BI20Comm Loss: Condenser Rfgt Pressure OutputRead0 = Off, 1 = On
BI21Comm Loss: Condenser Entering Water TempRead0 = Off, 1 = On
BI22Comm Loss: Condenser Leaving Water TempRead0 = Off, 1 = On
BI23Comm Loss: Condenser Liquid Level SensorRead0 = Off, 1 = On
BI24Comm Loss: Condenser Water Flow Measurement SensorRead0 = Off, 1 = On
BI25Comm Loss: Condenser Water Flow SwitchRead0 = Off, 1 = On
BI26Comm Loss: Condenser Water Pump RelayRead0 = Off, 1 = On
BI27Comm Loss: Drive Cooling Supply TemperatureRead0 = Off, 1 = On
BI28Comm Loss: Drive Cooling ValveRead0 = Off, 1 = On
BI29Comm Loss: Economizer PressureRead0 = Off, 1 = On
BI30Comm Loss: Economizer TemperatureRead0 = Off, 1 = On
BI31Comm Loss: Economizer ValveRead0 = Off, 1 = On
BI32Comm Loss: Emergency StopRead0 = Off, 1 = On
BI33Comm Loss: Evap Entering Water TempRead0 = Off, 1 = On
BI34Comm Loss: Evap Leaving Water TempRead0 = Off, 1 = On
BI35Comm Loss: Evaporator EXVRead0 = Off, 1 = On
BI36Comm Loss: Evaporator Refrigerant PressureRead0 = Off, 1 = On
BI37Comm Loss: Evaporator Water Flow Measurement SensorRead0 = Off, 1 = On
BI38Comm Loss: Evaporator Water Flow SwitchRead0 = Off, 1 = On
BI39Comm Loss: Evaporator Water Pump RelayRead0 = Off, 1 = On
BI40Comm Loss: Ext Base Loading CommandRead0 = Off, 1 = On
BI41Comm Loss: Ext Base Loading SetpointRead0 = Off, 1 = On
BI42Comm Loss: Ext Chilled/Hot Water SetpointRead0 = Off, 1 = On
BI43Comm Loss: Ext Demand Limit SetpointRead0 = Off, 1 = On
BI44Comm Loss: External Auto/StopRead0 = Off, 1 = On
BI45Comm Loss: External Hot Water CommandRead0 = Off, 1 = On
BI46Comm Loss: External Ice Building CommandRead0 = Off, 1 = On
BI47Comm Loss: Ice Building Status RelayRead0 = Off, 1 = On
BI48Comm Loss: IGV First Stage ActuatorRead0 = Off, 1 = On
BI49Comm Loss: Local BAS InterfaceRead0 = Off, 1 = On
BI50Comm Loss: Magnetic Bearing ControllerRead0 = Off, 1 = On
BI51Comm Loss: MBC Cooling ValveRead0 = Off, 1 = On
BI52Comm Loss: Motor Cooling ValveRead0 = Off, 1 = On
BI53Comm Loss: Motor Winding Temperature 1Read0 = Off, 1 = On
BI54Comm Loss: Motor Winding Temperature 2Read0 = Off, 1 = On
BI55Comm Loss: Motor Winding Temperature 3Read0 = Off, 1 = On
BI56Comm Loss: Outdoor Air TemperatureRead0 = Off, 1 = On
BI57Comm Loss: Programmable Relay Board 1Read0 = Off, 1 = On
BI58Comm Loss: Programmable Relay Board 2Read0 = Off, 1 = On
BI59Comm Loss: Refrigerant Monitor InputRead0 = Off, 1 = On
BI60Comm Loss: UPS FaultRead0 = Off, 1 = On
BI61Compressor Discharge Refrigerant Temp SensorRead0 = Off, 1 = On
BI62Condenser Entering Water Temp SensorRead0 = Off, 1 = On
BI63Condenser Leaving Water Temp SensorRead0 = Off, 1 = On
BI64Condenser Liquid Level SensorRead0 = Off, 1 = On
BI65Condenser Refrigerant Pressure SensorRead0 = Off, 1 = On
BI66Condenser Water FlowRead0 = No Flow, 1 = Flow
BI67Condenser Water Flow LostRead0 = Off, 1 = On
BI68Condenser Water Flow Measurement SensorRead0 = Off, 1 = On
BI69Condenser Water Flow OverdueRead0 = Off, 1 = On
BI70Condenser Water Pump CommandRead0 = Off (Pump Off), 1 = On (Pump On)
BI71Drive Cooling Supply Temperature SensorRead0 = Off, 1 = On
BI72Economizer Pressure SensorRead0 = Off, 1 = On
BI73Economizer Temperature SensorRead0 = Off, 1 = On
BI74Emergency StopRead0 = Off, 1 = On
BI75Emergency StopRead0 = Inactive, 1 = Active
BI76Evaporator Entering Water Temp SensorRead0 = Off, 1 = On
BI77Evaporator Leaving Water Temp SensorRead0 = Off, 1 = On
BI78Evaporator Refrigerant Pressure SensorRead0 = Off, 1 = On
BI79Evaporator Water FlowRead0 = No Flow, 1 = Flow
BI80Evaporator Water Flow LostRead0 = Off, 1 = On
BI81Evaporator Water Flow Measurement SensorRead0 = Off, 1 = On
BI82Evaporator Water Flow OverdueRead0 = Off, 1 = On
BI83Evaporator Water Pump CommandRead0 = Off (Pump Off), 1 = On (Pump On)
BI84Extended Compressor SurgeRead0 = Off, 1 = On
BI85External Base Loading SetpointRead0 = Off, 1 = On
BI86External Chilled/Hot Water SetpointRead0 = Off, 1 = On
BI87External Demand Limit SetpointRead0 = Off, 1 = On
BI88Front Panel Base Loading CommandRead0 = Auto, 1 = On
BI89Head Relief Request RelayRead0 = Inactive, 1 = Active
BI90High Compressor Refrigerant Discharge TemperatureRead0 = Off, 1 = On
BI91High Condenser Liquid LevelRead0 = Off, 1 = On
BI92High Condenser PressureRead0 = Off, 1 = On
BI93High Evaporator Refrigerant PressureRead0 = Off, 1 = On
BI94High Evaporator Water TemperatureRead0 = Off, 1 = On
BI95High Motor Winding Temperature 1Read0 = Off, 1 = On
BI96High Motor Winding Temperature 2Read0 = Off, 1 = On
BI97High Motor Winding Temperature 3Read0 = Off, 1 = On
BI98High Vacuum LockoutRead0 = Off, 1 = On
BI99Inverted Condenser Approach TemperatureRead0 = Off, 1 = On
BI100Inverted Condenser Water TemperatureRead0 = Off, 1 = On
BI101Inverted Evaporator Approach TemperatureRead0 = Off, 1 = On
BI102Inverted Evaporator Water TemperatureRead0 = Off, 1 = On
BI103LCI-C Software Mismatch: Use BAS ToolRead0 = Off, 1 = On
BI104Limit Mode Relay StatusRead0 = Inactive, 1 = Active
BImin105Local Setpoint ControlRead0 = No, 1 = Yes
BI106Loss of Drive Cooling ControlRead0 = Off, 1 = On
BI107Loss of MBC Cooling ControlRead0 = Off, 1 = On
BI108Loss of Motor Cooling ControlRead0 = Off, 1 = On
BI109Low Condenser Liquid LevelRead0 = Off, 1 = On
BI110Low Evap Leaving Water Temp: Unit OnRead0 = Off, 1 = On
BI111Low Evap Leaving Water Temp: Unit OffRead0 = Off, 1 = On
BI112Low Evaporator Refrigerant TemperatureRead0 = Off, 1 = On
BI113Low Evaporator Water FlowRead0 = Off, 1 = On
BI114Manual Override ExistsRead0 = No, 1 = Yes
BI115Maximum Capacity RelayRead0 = Inactive, 1 = Active
BI116MBC Bearing Temperature 1Read0 = Off, 1 = On
BI117MBC Bearing Temperature 2Read0 = Off, 1 = On
BI118MBC Failed CenteringRead0 = Off, 1 = On
BI119MBC Failed Clearance CheckRead0 = Off, 1 = On
BI121MBC Not Ready To RotateRead0 = Off, 1 = On
BI122MBC Over VoltageRead0 = Off, 1 = On
BI123MBC OverspeedRead0 = Off, 1 = On
BI124MBC Parameter Table Not SetRead0 = Off, 1 = On
BI125MBC PCB TemperatureRead0 = Off, 1 = On
BI126MBC Rotation Detected Without LevitationRead0 = Off, 1 = On
BI128MBC Rotor Unbalance AlarmRead0 = Off, 1 = On
BI129MBC Shutdown RequestRead0 = Off, 1 = On
BI130MBC Speed SensorRead0 = Off, 1 = On
BI131MBC Under VoltageRead0 = Off, 1 = On
BI132Motor Winding Temperature 1 SensorRead0 = Off, 1 = On
BI133Motor Winding Temperature 2 SensorRead0 = Off, 1 = On
BI134Motor Winding Temperature 3 SensorRead0 = Off, 1 = On
BI135MP: Invalid ConfigurationRead0 = Off, 1 = On
BI136MP: Reset Has OccurredRead0 = Off, 1 = On
BI137Outdoor Air Temp SensorRead0 = Off, 1 = On
BI138Refrigerant Monitor InputRead0 = Off, 1 = On
BI139Run EnableRead0 = No, 1 = Yes
BI140Software Error 1001: Call Trane ServiceRead0 = Off, 1 = On
BI141Software Error 1002: Call Trane ServiceRead0 = Off, 1 = On
BI142Software Error 1003: Call Trane ServiceRead0 = Off, 1 = On
BI144Unexpected Starter ShutdownRead0 = Off, 1 = On
BI145UPS FaultRead0 = Off, 1 = On
BI146AFD UC800 Speed MismatchRead0 = Off, 1 = On
BI147MBC Not CenteredRead0 = Off, 1 = On
BI148Loss of Evaporator EXV ControlRead0 = Off, 1 = On
BI149MBC Rotor ElongationRead0 = Off, 1 = On
BI150Comm Loss: Evaporator Entering Water PressureRead0 = Off, 1 = On
BI151Comm Loss: Evaporator Leaving Water PressureRead0 = Off, 1 = On
BI152Comm Loss: Condenser Entering Water PressureRead0 = Off, 1 = On
BI153Comm Loss: Condenser Leaving Water PressureRead0 = Off, 1 = On
BI154Evaporator Entering Water PressureRead0 = Off, 1 = On
BI155Evaporator Leaving Water PressureRead0 = Off, 1 = On
BI156Condenser Entering Water PressureRead0 = Off, 1 = On
BI157Condenser Leaving Water PressureRead0 = Off, 1 = On
BV1BAS Base Loading EnableWrite0 = Disable, 1 = Enable
BV2BAS Diagnostic ResetWrite0 = false (no reset), 1 = true (can reset)
MI1Chiller Control ModeRead1 = Cool, 2 = Heat, 3 = Ice
MI2Active Base Loading Setpoint SourceRead1 = Front Panel, 2 = External, 3 = Ice Machine, 4 = BAS
MI3Active Chilled Water Setpoint SourceRead1 = Front Panel, 2 = External, 3 = Ice Machine, 4 = BAS
MI4Active Demand Limit Setpoint SourceRead1 = Front Panel, 2 = External, 3 = Ice Machine, 4 = BAS
MI5Active Hot Water Setpoint SourceRead1 = Front Panel, 2 = External, 3 = Ice Machine, 4 = BAS
MI6Chiller Running StatusRead1 = Not Running, 2 = Starting, 3 = Running, 4 = Stopping
MI7Compressor RunningRead0 = Off, 1 = On
MI8External Auto StopRead0 = Stop, 1 = Auto
MI9Front Panel Auto/StopRead0 = Stop, 1 = Auto
MI10Front Panel Chiller ModeRead1 = Cool, 2 = Heat, 3 = Ice
MI11Setpoint SourceRead1 = BAS/Ext/FP, 2 = Ext/FP, 3 = Front Panel
MI12Refrigerant TypeRead5 = R134a, 13 = R513A
MVmin1BAS Chiller Auto Stop CommandWrite1 = Stop, 2 = Auto
MVmin2BAS Chiller Mode CommandWrite1 = cool, 2 = heat, 3 = ice

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 HDWA (UC800) 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 HDWA (UC800)

How many BACnet points does the Trane Symbio 800 HDWA (UC800) have?

This list has 231 BACnet objects: 58 analog inputs, 4 analog values, 153 binary inputs, 2 binary values, 12 multi-state inputs, 2 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.

Which Trane Symbio 800 HDWA (UC800) BACnet points are writable?

8 of the 231 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 HDWA (UC800) BACnet documentation?

The source is Symbio 800 Integration Points List BACnet - HDWA (UC800) (BAS-PTS028A-EN), revision 12/6/2024, published free by Trane at https://elibrary.tranetechnologies.com/public/commercial-hvac/Literature/Points%20List/BAS-PTS028A-EN_12062024.pdf.

What are the minimum BACnet points to integrate the Trane Symbio 800 HDWA (UC800)?

Start with MV 1 BAS Chiller Auto Stop Command (BMS auto/stop command (1 = Stop, 2 = Auto)); MV 2 BAS Chiller Mode Command (Cool/heat/ice mode command); AV 2 BAS Chilled Water Setpoint (Chilled water setpoint from the BMS); AV 3 BAS Demand Limit Setpoint (Demand limit from the BMS, % RLA); BI 14 Chiller Running State (Chiller on/off status); BI 105 Local Setpoint Control (Shows if local setpoints override BAS setpoints); AI 34 Evaporator Leaving Water Temperature (Leaving chilled water temperature); AI 20 Calculated Chiller Capacity (Calculated cooling capacity, kW); BI 10 Alarm Present (Any active alarm on the chiller).

How do I enable BMS control of the Trane Symbio 800 HDWA (UC800)?

MV 1 BAS Chiller Auto Stop Command (1 = Stop, 2 = Auto; relinquish default Auto) is the BMS auto/stop; with it at Auto the chiller runs when its own run conditions are met. MI 8 External Auto Stop reports the hardwired external auto/stop input, and BI 139 Run Enable shows whether the chiller is enabled to run. The documents don't say how the two combine or how to hand setpoint control to the BAS; BI 105 Local Setpoint Control shows when the chiller is using local setpoints instead of BAS setpoints, and MI 3 Active Chilled Water Setpoint Source shows Front Panel, External, Ice Machine or BAS.

Does the Trane Symbio 800 HDWA (UC800) need a BACnet heartbeat or have a communication timeout?

No timeout or heartbeat is described. The list includes the diagnostic flags BI 11 'BAS Communication Lost', BI 12 'BAS Failed to Establish Communication' and BI 49 'Comm Loss: Local BAS Interface'; the document doesn't say what timeout sets them or what the chiller does when they are set.

How do I check these points on the real Symbio 800 HDWA (UC800)?

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 - HDWA (UC800) · BAS-PTS028A-EN · rev. 12/6/2024. Object names, instances and units are reproduced as published; descriptions are our own.