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Air-cooled chiller controller · BACnet points list
Trane Symbio 800 ACSA (UC800) BACnet points list
Updated 28 October 2026
This Symbio 800 list for ACSA chillers has about 340 BACnet objects with low instance numbers: AI 1-150, BI 1-26 for status and BI 506-943 for diagnostics. The BAS writes chilled and hot water setpoints, demand limit, heat recovery, noise reduction, circuit lockouts, mode and auto/stop; auto/stop and mode are multistate values.
This page lists 342 BACnet objects for the Trane Symbio 800 ACSA (UC800) — 13 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 ACSA (UC800)
- Equipment
- Air-cooled chiller controller
- Equipment type
- Chillers
- BACnet objects
- 342 (13 writable)
- Transport
- BACnet IP, BACnet MS/TP
- Firmware
- Not stated
- Also known as
- ACSA, ACSA UC800, Symbio 800 ACSA, BAS-PTS026
BMS integration notes: Trane Symbio 800 ACSA (UC800)
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.
| Object | Name | Why | Access |
|---|---|---|---|
| MV 1 | BAS Chiller Auto Stop Command | BMS auto/stop command (1 = Stop, 2 = Auto) | Write |
| MV 2 | BAS Chiller Mode Command | Cool/heat/ice mode command | Write |
| AV 1 | Chilled Water Setpoint | Chilled water setpoint from the BMS | Write |
| AV 3 | Demand Limit Setpoint | Capacity (demand) limit from the BMS | Write |
| BI 4 | Chiller Running State | Chiller on/off status | Read |
| BI 2 | Local Setpoint Control | Shows if local setpoints override BAS setpoints | Read |
| AI 4 | Evaporator Leaving Water Temperature | Leaving chilled water temperature | Read |
| AI 21 | Actual Running Capacity | Actual running capacity in percent | Read |
| BI 10 | Alarm Present | Any active alarm on the chiller | Read |
Enable & remote start
MV 1 BAS Chiller Auto Stop Command (1 = Stop, 2 = Auto) is the BMS auto/stop; with it at Auto the chiller runs when its own run conditions are met. MI 7 External Auto Stop reports the hardwired external auto/stop input, and BI 1 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 2 Local Setpoint Control shows when the chiller is using local setpoints instead of BAS setpoints, and MI 5 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 881 'BAS Communication Lost', BI 882 'BAS Failed to Establish Communication' and BI 600 '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
- With no protocol specified at order, the controller ships as BACnet MS/TP at 76,800 bps with the rotary address at 000, and MS/TP is disabled at 000. Set a rotary address of 001-127 to bring it online.
- The rotary address sets the MS/TP MAC and the Device ID and takes effect without a power cycle. A software Device ID (1-4194302) can be set in the web UI, Tracer SC+ or Tracer TU.
- The web UI is reached only over USB at http://198.80.18.1/; the Ethernet ports do not serve it.
- BACnet IP uses Ethernet port 1 (or the optional USB Wi-Fi adapter); the default UDP port is 47808. Enable BBMD only if this is the only BACnet IP device on the subnet, then fill in the BDT.
- MS/TP wiring lands on the P1 link; P2 and P3 are for factory devices only, and Ethernet port 2 is only for the touch-screen display.
Watch out for
- Communicated units (I-P or SI) are fixed at the factory; changing them in the field needs a Trane representative. Web UI display units do not change the BACnet values.
- Points that don't apply to the unit's configuration are absent, and a technician can 'recycle' (remove) factory points from the interface, so a missing object may have been recycled.
- The chiller lists have no read/write column; writability of the AV/BV/MV objects is inferred from Trane's naming convention.
- Diagnostic BIs are one object per alarm condition and only exist for the options fitted.
- Auto/stop is a multistate value (MV 1: 1 = Stop, 2 = Auto), not a binary as on the standard Symbio 800 lists.
- MI 4 Setpoint Source (BAS/Ext/FP, Ext/FP, Front Panel) decides which setpoint sources are allowed; it is read-only here.
Trane Symbio 800 ACSA (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.
| Description | States | |||||
|---|---|---|---|---|---|---|
| AI | 1 | Active Cool/Heat Water Setpoint Temperature | Read | |||
| AI | 2 | Front Panel Chilled Water Setpoint | Read | |||
| AI | 3 | Evaporator Entering Water Temperature | Read | |||
| AImin | 4 | Evaporator Leaving Water Temperature | Read | |||
| AI | 5 | Active Demand Limit Setpoint | Read | |||
| AI | 6 | Front Panel Demand Limit Setpoint | Read | |||
| AI | 7 | Unit Power Consumption | Read | |||
| AI | 8 | Outdoor Air Temperature | Read | |||
| AI | 9 | External Chilled/Hot Water Setpoint | Read | |||
| AI | 10 | External Demand Limit Setpoint | Read | |||
| AI | 11 | Evaporator Refrigerant Pressure Ckt1 | Read | |||
| AI | 12 | Condenser Refrigerant Pressure Ckt1 | Read | |||
| AI | 13 | Differential Refrigerant Pressure Ckt1 | Read | |||
| AI | 14 | Suction(Evaporator) Saturated Rfgt Temp Ckt1 | Read | |||
| AI | 15 | Condenser Saturated Rfgt Temp Ckt1 | Read | |||
| AI | 16 | Evaporator Refrigerant Pressure Ckt2 | Read | |||
| AI | 17 | Condenser Refrigerant Pressure Ckt2 | Read | |||
| AI | 18 | Differential Refrigerant Pressure Ckt2 | Read | |||
| AI | 19 | Suction(Evaporator) Saturated Rfgt Temp Ckt2 | Read | |||
| AI | 20 | Condenser Saturated Rfgt Temp Ckt2 | Read | |||
| AImin | 21 | Actual Running Capacity | Read | |||
| AI | 22 | Active Heat Recovery Setpoint | Read | |||
| AI | 23 | Front Panel Hot Water Setpoint | Read | |||
| AI | 24 | Active Hot Water Setpoint | Read | |||
| AI | 25 | Liquid Line Temperature Ckt1 | Read | |||
| AI | 26 | Liquid Line Temperature Ckt2 | Read | |||
| AI | 27 | Liquid Line Pressure Ckt1 | Read | |||
| AI | 28 | Liquid Line Pressure Ckt2 | Read | |||
| AI | 30 | Air Flow Ckt1 | Read | |||
| AI | 31 | Air Flow Ckt2 | Read | |||
| AI | 35 | Starts Cprsr1A | Read | |||
| AI | 36 | Run Time Cprsr1A | Read | |||
| AI | 51 | Starts Cprsr2A | Read | |||
| AI | 52 | Run Time Cprsr2A | Read | |||
| AI | 69 | Heat Recovery Entering Water Temp | Read | |||
| AI | 70 | Heat Recovery Leaving Water Temp | Read | |||
| AI | 71 | Chiller Design Capacity | Read | |||
| AI | 128 | Starts Cprsr1B | Read | |||
| AI | 129 | Run Time Cprsr1B | Read | |||
| AI | 130 | Starts Cprsr2B | Read | |||
| AI | 131 | Run Time Cprsr2B | Read | |||
| AI | 132 | Number of Circuits | Read | |||
| AI | 133 | Number of Compressors, Circuit 1 | Read | |||
| AI | 134 | Number of Compressors, Circuit 2 | Read | |||
| AI | 136 | Free Cooling Capacity | Read | |||
| AI | 137 | Free Cooling Entering Water Temperature | Read | |||
| AI | 138 | Free Cooling Entering Glycol Temperature | Read | |||
| AI | 139 | Free Cooling Leaving Glycol Temperature | Read | |||
| AI | 141 | Energy Consumption NonReset | Read | |||
| AI | 142 | Energy Consumption Resettable | Read | |||
| AI | 143 | Starts Cprsr1C | Read | |||
| AI | 144 | Run Time Cprsr1C | Read | |||
| AI | 145 | Starts Cprsr2C | Read | |||
| AI | 146 | Run Time Cprsr2C | Read | |||
| AI | 147 | Discharge Temperature Ckt1 | Read | |||
| AI | 148 | Discharge Temperature Ckt2 | Read | |||
| AI | 149 | Compressor Discharge Temperature Ckt1 | Read | |||
| AI | 150 | Compressor Discharge Temperature Ckt2 | Read | |||
| AVmin | 1 | Chilled Water Setpoint | Write | |||
| AV | 2 | Hot Water Setpoint | Write | |||
| AVmin | 3 | Demand Limit Setpoint | Write | |||
| AV | 4 | BAS Heat Recovery Setpoint | Write | |||
| BI | 1 | Run Enable | Read | 0 = no, 1 = yes | ||
| BImin | 2 | Local Setpoint Control | Read | 0 = no, 1 = yes | ||
| BI | 3 | Limit Mode Relay Status | Read | 0 = off, 1 = on | ||
| BImin | 4 | Chiller Running State | Read | 0 = no (not running), 1 = yes (running) | ||
| BI | 5 | Maximum Capacity Relay | Read | 0 = off, 1 = on | ||
| BI | 6 | Evaporator Water Pump Command | Read | 0 = off (pump off), 1 = on (pump on) | ||
| BI | 7 | Evaporator Water Flow Status | Read | 0 = no flow, 1 = flow | ||
| BI | 8 | Manual Override Exists | Read | 0 = false, 1 = true | ||
| BI | 9 | Emergency Stop Input | Read | 0 = emergency shutdown, 1 = auto | ||
| BImin | 10 | Alarm Present | Read | 0 = no, 1 = yes | ||
| BI | 11 | Running Status Cprsr1A | Read | 1 = off, 2 = on | ||
| BI | 12 | Running Status Cprsr2A | Read | 1 = off, 2 = on | ||
| BI | 13 | Running Status Cprsr1B | Read | 1 = off, 2 = on | ||
| BI | 14 | Running Status Cprsr2B | Read | 1 = off, 2 = on | ||
| BI | 15 | Free Cooling Active | Read | 0 = Active, 1 = Inactive | ||
| BI | 16 | Heat Recovery Active | Read | 0 = Active, 1 = Inactive | ||
| BI | 17 | Active Heat Recovery Command | Read | 0 = Active, 1 = Inactive | ||
| BI | 18 | Latching Alarm Present, Circuit 1 | Read | 0 = no, 1 = yes | ||
| BI | 19 | Latching Alarm Present, Circuit 2 | Read | 0 = no, 1 = yes | ||
| BI | 20 | Non-Latching Alarm Present, Circuit 1 | Read | 0 = no, 1 = yes | ||
| BI | 21 | Non-Latching Alarm Present, Circuit 2 | Read | 0 = no, 1 = yes | ||
| BI | 22 | Running Status Cprsr1C | Read | 1 = off, 2 = on | ||
| BI | 23 | Running Status Cprsr2C | Read | 1 = off, 2 = on | ||
| BI | 24 | Emergency Stop Unit Status | Read | 0 = emergency shutdown, 1 = auto | ||
| BI | 25 | Noise Reduction Active | Read | |||
| BI | 26 | No assignment - reserved as obsolete | Read | NA | ||
| BI | 506 | Comm Loss: Evaporator Anti-Freeze Heater | Read | |||
| BI | 507 | Comm Loss: Auxiliary Setpoint Command | Read | |||
| BI | 508 | Comm Loss: Evaporator Water Flow Switch | Read | |||
| BI | 509 | Comm Loss: Compressor Fault Input | Read | |||
| BI | 510 | Comm Loss: Compressor Fault Input | Read | |||
| BI | 511 | Comm Loss: Compressor Fault Input | Read | |||
| BI | 512 | Comm Loss: Compressor Fault Input | Read | |||
| BI | 513 | Comm Loss: Compressor Fault Input | Read | |||
| BI | 514 | Comm Loss: Compressor Fault Input | Read | |||
| BI | 518 | Comm Loss: Cond Fan Enbl Shared Ckt 1&2 | Read | |||
| BI | 520 | Comm Loss: Condenser Fan Enable | Read | |||
| BI | 521 | Comm Loss: Condenser Fan Enable | Read | |||
| BI | 533 | Comm Loss: Discharge Temperature Sensor | Read | |||
| BI | 534 | Comm Loss: Discharge Temperature Sensor | Read | |||
| BI | 535 | Comm Loss: Discharge Pressure Transducer | Read | |||
| BI | 536 | Comm Loss: Discharge Pressure Transducer | Read | |||
| BI | 537 | Comm Loss: Electronic Expansion Valve | Read | |||
| BI | 538 | Comm Loss: Electronic Expansion Valve | Read | |||
| BI | 539 | Comm Loss: Emergency Stop Feedback Input | Read | |||
| BI | 541 | Comm Loss: Evap Entering Water Temp | Read | |||
| BI | 543 | Comm Loss: Evap Leaving Water Temp | Read | |||
| BI | 545 | Comm Loss: Evap Pump Inv1 Fault Input | Read | |||
| BI | 546 | Comm Loss: Evap Pump Inv1 Freq Feedback | Read | |||
| BI | 547 | Comm Loss: Evap Pump Inv1 Run Command | Read | |||
| BI | 550 | Comm Loss: Evaporator Water Pump 1 Relay | Read | |||
| BI | 551 | Comm Loss: Evaporator Water Pump 2 Relay | Read | |||
| BI | 556 | Comm Loss: Ext Chilled Water Setpoint | Read | |||
| BI | 557 | External Demand Limit Setpoint | Read | |||
| BI | 558 | Comm Loss: Ext Noise Reduction Request | Read | |||
| BI | 559 | Comm Loss: External Auto/Stop | Read | |||
| BI | 560 | Comm Loss: External Ckt Lockout | Read | |||
| BI | 561 | Comm Loss: External Ckt Lockout | Read | |||
| BI | 562 | Comm Loss: External Heat Recovery Command | Read | |||
| BI | 563 | Comm Loss: External Ice Building Command | Read | |||
| BI | 564 | Comm Loss: Fan Board 1 Relay 1 | Read | |||
| BI | 565 | Comm Loss: Fan Board 1 Relay 1 | Read | |||
| BI | 566 | Comm Loss: Fan Board 1 Relay 2 | Read | |||
| BI | 567 | Comm Loss: Fan Board 1 Relay 2 | Read | |||
| BI | 568 | Comm Loss: Fan Board 1 Relay 3 | Read | |||
| BI | 569 | Comm Loss: Fan Board 1 Relay 3 | Read | |||
| BI | 570 | Comm Loss: Fan Board 1 Relay 4 | Read | |||
| BI | 571 | Comm Loss: Fan Board 1 Relay 4 | Read | |||
| BI | 572 | Comm Loss: Fan Speed Select Board Relay 1 | Read | |||
| BI | 574 | Comm Loss: Fan Speed Select Board Relay 2 | Read | |||
| BI | 577 | Comm Loss: Fan Speed Select Board Relay 3 | Read | |||
| BI | 579 | Comm Loss: Fan Speed Select Board Relay 4 | Read | |||
| BI | 582 | Comm Loss: Fan Inv Spd Cmd, Shrd Ckt1&2 | Read | |||
| BI | 585 | Comm Loss: Fan Inverter Speed Command | Read | |||
| BI | 586 | Comm Loss: Fan Inverter Speed Command | Read | |||
| BI | 590 | Comm Loss: High Pressure Cutout Switch | Read | |||
| BI | 591 | Comm Loss: High Pressure Cutout Switch | Read | |||
| BI | 596 | Comm Loss: HR Entering Water Temp Sensor | Read | |||
| BI | 597 | Comm Loss: HR Leaving Water Temp Sensor | Read | |||
| BI | 598 | Comm Loss: HR Three Way Valve | Read | |||
| BI | 600 | Comm Loss: Local BAS Interface | Read | |||
| BI | 602 | Comm Loss: Programmable Relay Board 1 | Read | |||
| BI | 603 | Comm Loss: Outdoor Air Temperature | Read | |||
| BI | 604 | Comm Loss: Percent Capacity Output | Read | |||
| BI | 605 | Comm Loss: Phase Protection Fault Input | Read | |||
| BI | 606 | Comm Loss: Programmable Relay Board 2 | Read | |||
| BI | 617 | Comm Loss: Run Command Compressor A | Read | |||
| BI | 618 | Comm Loss: Run Command Compressor A | Read | |||
| BI | 619 | Comm Loss: Run Command Compressor B | Read | |||
| BI | 620 | Comm Loss: Run Command Compressor B | Read | |||
| BI | 621 | Comm Loss: Run Command Compressor C | Read | |||
| BI | 622 | Comm Loss: Run Command Compressor C | Read | |||
| BI | 628 | Comm Loss: Suction Rfgt Pressure | Read | |||
| BI | 629 | Comm Loss: Suction Rfgt Pressure | Read | |||
| BI | 630 | Comm Loss: Suction Temperature | Read | |||
| BI | 631 | Comm Loss: Suction Temperature | Read | |||
| BI | 636 | Compressor A Fault | Read | |||
| BI | 637 | Compressor A Fault | Read | |||
| BI | 638 | Compressor B Fault | Read | |||
| BI | 639 | Compressor B Fault | Read | |||
| BI | 640 | Compressor C Fault | Read | |||
| BI | 641 | Compressor C Fault | Read | |||
| BI | 642 | Compressor Fault Lockout | Read | |||
| BI | 643 | Compressor Fault Lockout | Read | |||
| BI | 644 | Compressor Fault Lockout | Read | |||
| BI | 645 | Compressor Fault Lockout | Read | |||
| BI | 646 | Compressor Fault Lockout | Read | |||
| BI | 647 | Compressor Fault Lockout | Read | |||
| BI | 650 | Discharge Pressure Transducer | Read | |||
| BI | 651 | Discharge Pressure Transducer | Read | |||
| BI | 669 | Emergency Stop | Read | |||
| BI | 691 | Evap Pump 1 Starts/Hours Modified | Read | |||
| BI | 692 | Evap Pump 2 Starts/Hours Modified | Read | |||
| BI | 694 | Evaporator Entering Water Temp Sensor | Read | |||
| BI | 696 | Evaporator Leaving Water Temp Sensor | Read | |||
| BI | 698 | Evaporator Pump 1 Fault | Read | |||
| BI | 699 | Evaporator Pump 2 Fault | Read | |||
| BI | 700 | Evaporator Water Flow Lost | Read | |||
| BI | 701 | Evaporator Water Flow Lost Lockout | Read | |||
| BI | 702 | Evaporator Water Flow Lost - Pump1 | Read | |||
| BI | 703 | Evaporator Water Flow Lost - Pump2 | Read | |||
| BI | 704 | Evaporator Water Flow Overdue | Read | |||
| BI | 705 | Evaporator Water Flow Overdue - Pump1 | Read | |||
| BI | 706 | Evaporator Water Flow Overdue - Pump2 | Read | |||
| BI | 707 | Evaporator Water Flow Too Low | Read | |||
| BI | 708 | External Chilled/Hot Water Setpoint | Read | |||
| BI | 711 | Heat Recovery Entering Water Temp Sensor | Read | |||
| BI | 712 | Heat Recovery Leaving Water Temp Sensor | Read | |||
| BI | 713 | High Compressor Pressure Differential | Read | |||
| BI | 714 | High Compressor Pressure Differential | Read | |||
| BI | 715 | High Discharge Refrigerant Pressure | Read | |||
| BI | 716 | High Discharge Refrigerant Pressure | Read | |||
| BI | 717 | High Discharge Temperature | Read | |||
| BI | 718 | High Discharge Temperature | Read | |||
| BI | 731 | High Discharge Temperature Lockout | Read | |||
| BI | 732 | High Discharge Temperature Lockout | Read | |||
| BI | 733 | High Evaporator Water Temperature | Read | |||
| BI | 746 | High Pressure Cutout | Read | |||
| BI | 747 | High Pressure Cutout | Read | |||
| BI | 748 | High Suction Rfgt Pressure | Read | |||
| BI | 768 | Inverted Evaporator Water Temperature | Read | |||
| BI | 769 | Inverted Water Temp (Heating) | Read | |||
| BI | 770 | LCI-C Software Mismatch: Use BAS Tool | Read | |||
| BI | 771 | Loss of Charge | Read | |||
| BI | 772 | Loss of Charge | Read | |||
| BI | 775 | Low Discharge Saturated Temperature | Read | |||
| BI | 776 | Low Discharge Saturated Temperature | Read | |||
| BI | 777 | Low Evaporator Water Temp (Unit Off) | Read | |||
| BI | 778 | Low Evaporator Water Temp (Unit On) | Read | |||
| BI | 779 | Low Suction Refrigerant Temperature | Read | |||
| BI | 780 | Low Suction Refrigerant Temperature | Read | |||
| BI | 782 | Low Suction Refrigerant Pressure | Read | |||
| BI | 783 | Low Refrigerant Pressure Ratio | Read | |||
| BI | 784 | Low Refrigerant Pressure Ratio | Read | |||
| BI | 785 | Low Suction Refrigerant Pressure | Read | |||
| BI | 786 | Low Suction Superheat | Read | |||
| BI | 787 | Low Suction Superheat | Read | |||
| BI | 827 | MP: Invalid Configuration | Read | |||
| BI | 829 | MP: Reset Has Occurred | Read | |||
| BI | 832 | Pumpdown Terminated By Time | Read | |||
| BI | 833 | Outdoor Air Temperature Sensor | Read | |||
| BI | 834 | Phase Protection Fault | Read | |||
| BI | 835 | No Total Heat Recovery | Read | |||
| BI | 838 | Restart Inhibit Invoked - 1A | Read | |||
| BI | 839 | Restart Inhibit Invoked - 2A | Read | |||
| BI | 840 | Restart Inhibit Invoked - 1B | Read | |||
| BI | 841 | Restart Inhibit Invoked - 2B | Read | |||
| BI | 842 | Restart Inhibit Invoked - 1C | Read | |||
| BI | 843 | Restart Inhibit Invoked - 2C | Read | |||
| BI | 848 | Starts/Hours Modified 1C | Read | |||
| BI | 849 | Starts/Hours Modified 2A | Read | |||
| BI | 850 | Starts/Hours Modified 1B | Read | |||
| BI | 851 | Starts/Hours Modified 1A | Read | |||
| BI | 852 | Starts/Hours Modified 2B | Read | |||
| BI | 853 | Starts/Hours Modified 2C | Read | |||
| BI | 856 | Suction Pressure Transducer | Read | |||
| BI | 857 | Suction Pressure Transducer | Read | |||
| BI | 858 | Suction Temperature Sensor | Read | |||
| BI | 859 | Suction Temperature Sensor | Read | |||
| BI | 860 | Suction Temperature Too High | Read | |||
| BI | 861 | Suction Temperature Too High | Read | |||
| BI | 862 | Very Low Suction Pressure - Circuit 1 | Read | |||
| BI | 863 | Very Low Suction Pressure - Circuit 2 | Read | |||
| BI | 864 | Chiller Service Recommended | Read | |||
| BI | 865 | Pumpdown Terminated By Time | Read | |||
| BI | 866 | Comm Loss: Energy Meter Pulse Input | Read | |||
| BI | 867 | Comm Loss: Evap Pump Inverter 1 Speed | Read | |||
| BI | 868 | Comm Loss: Ext Demand Limit Stpt | Read | |||
| BI | 869 | Comm Loss: Heat Recovery Anti-Freeze Heater | Read | |||
| BI | 871 | Comm Loss: Evaporator Pump 1 Fault Input | Read | |||
| BI | 872 | Comm Loss: Evaporator Pump 2 Fault Input | Read | |||
| BI | 873 | Evap Water Pump 1 Svc Recommended | Read | |||
| BI | 874 | Evap Water Pump 2 Svc Recommended | Read | |||
| BI | 875 | Mfr Maintenance Recommended - 1A | Read | |||
| BI | 876 | Mfr Maintenance Recommended - 1B | Read | |||
| BI | 877 | Mfr Maintenance Recommended - 1C | Read | |||
| BI | 878 | Mfr Maintenance Recommended - 2A | Read | |||
| BI | 879 | Mfr Maintenance Recommended - 2B | Read | |||
| BI | 880 | Mfr Maintenance Recommended - 2C | Read | |||
| BI | 881 | BAS Communication Lost | Read | |||
| BI | 882 | BAS Failed to Establish Communication | Read | |||
| BI | 883 | Comm Loss: FC Entering Glycol Temp | Read | |||
| BI | 884 | Comm Loss: FC Entering Water Temp | Read | |||
| BI | 885 | Comm Loss: FC Leaving Glycol Temp | Read | |||
| BI | 886 | Comm Loss: Free Cooling Pump | Read | |||
| BI | 887 | Comm Loss: Free Cooling Valve | Read | |||
| BI | 888 | Free Cooling Entering Glycol Temperature | Read | |||
| BI | 889 | Free Cooling Entering Water Temperature | Read | |||
| BI | 890 | Free Cooling Glycol Temp Equalization Overdue | Read | |||
| BI | 891 | Free Cooling Leaving Glycol Temperature | Read | |||
| BI | 892 | Low Glycol Temperature Free Cooling | Read | |||
| BI | 893 | Comm Loss: External Heat Recovery Setpoint | Read | |||
| BI | 894 | Comm Loss: Fan Board 2 Relay 1 | Read | |||
| BI | 895 | Comm Loss: Fan Board 2 Relay 1 | Read | |||
| BI | 896 | Comm Loss: Fan Board 2 Relay 2 | Read | |||
| BI | 897 | Comm Loss: Fan Board 2 Relay 2 | Read | |||
| BI | 898 | Comm Loss: Fan Board 2 Relay 3 | Read | |||
| BI | 899 | Comm Loss: Fan Board 2 Relay 3 | Read | |||
| BI | 900 | Comm Loss: Fan Board 2 Relay 4 | Read | |||
| BI | 901 | Comm Loss: Fan Board 2 Relay 4 | Read | |||
| BI | 902 | External Heat Recovery Setpoint | Read | |||
| BI | 903 | Comm Loss: HR Refrigerant Bypass Valve | Read | |||
| BI | 904 | Comm Loss: HR Refrigerant Bypass Valve | Read | |||
| BI | 905 | Comm Loss: Reversing Valve | Read | |||
| BI | 906 | Comm Loss: Reversing Valve | Read | |||
| BI | 907 | Comm Loss: Hot Gas Bypass Valve | Read | |||
| BI | 908 | Comm Loss: Dynamic Receiver Fill Valve | Read | |||
| BI | 909 | Comm Loss: Hot Gas Bypass Valve | Read | |||
| BI | 910 | Comm Loss: Dynamic Receiver Fill Valve | Read | |||
| BI | 912 | Comm Loss: External Hot Water Command | Read | |||
| BI | 913 | Comm Loss: Supplemental Heater Relay 1 | Read | |||
| BI | 915 | Comm Loss: Supplemental Heater Relay 2 | Read | |||
| BI | 916 | Comm Loss: Supplemental Heater Relay 3 | Read | |||
| BI | 917 | Comm Loss: Supplemental Heater Relay 4 | Read | |||
| BI | 918 | Comm Loss: Liquid Line Temperature | Read | |||
| BI | 919 | Comm Loss: Liquid Line Pressure | Read | |||
| BI | 920 | Liquid Line Temp Sensor | Read | |||
| BI | 921 | Liquid Line Pressure Transducer | Read | |||
| BI | 922 | Comm Loss: Liquid Line Temperature | Read | |||
| BI | 923 | Comm Loss: Liquid Line Pressure | Read | |||
| BI | 924 | Liquid Line Temp Sensor | Read | |||
| BI | 925 | Liquid Line Pressure Transducer | Read | |||
| BI | 926 | Comm Loss: Shared V Coil Isolation Valve | Read | |||
| BI | 927 | Comm Loss: Shared V Coil Isolation Valve | Read | |||
| BI | 928 | Free Cooling Glycol Flow Overdue | Read | |||
| BI | 929 | Comm Loss: Free Cooling Glycol Flow Switch | Read | |||
| BI | 930 | Comm Loss: Free Cooling Glycol Pressure | Read | |||
| BI | 931 | Free Cooling Glycol Pressure | Read | |||
| BI | 932 | Low Glycol Pressure Free Cooling | Read | |||
| BI | 933 | Comm Loss: Free Cooling Glycol Pump Fault | Read | |||
| BI | 934 | Free Cooling Glycol Pump Fault | Read | |||
| BI | 935 | Free Cooling Glycol Flow Lost | Read | |||
| BI | 936 | SLHX Entering Temp Sensor - Ckt1 | Read | |||
| BI | 937 | Comm Loss: SLHX Valve - Ckt1 | Read | |||
| BI | 938 | Comm Loss: SLHX Entering Refrigerant Temp - Ckt1 | Read | |||
| BI | 939 | SLHX Entering Temp Sensor - Ckt2 | Read | |||
| BI | 940 | Comm Loss: SLHX Valve - Ckt2 | Read | |||
| BI | 941 | Comm Loss: SLHX Entering Refrigerant Temp - Ckt2 | Read | |||
| BI | 942 | Comm Loss: Sump Heater - Ckt1 | Read | |||
| BI | 943 | Comm Loss: Sump Heater - Ckt2 | Read | |||
| BV | 2 | Reset Diagnostic | Write | 0 = false (no reset), 1 = true (can reset) | ||
| BV | 3 | BAS Noise Reduction Command | Write | 0 = Auto, 1 = On | ||
| BV | 4 | BAS Heat Recovery Command | Write | 0 = Auto, 1 = On | ||
| BV | 5 | Clear Energy Consumption | Write | 0 = Normal, 1 = Reset | ||
| BV | 6 | BAS Circuit 1 Lockout | Write | 0 = false (not locked), 1 = true (locked) | ||
| BV | 7 | BAS Circuit 2 Lockout | Write | 0 = false (not locked), 1 = true (locked) | ||
| MI | 1 | Chiller Running Status | Read | 1 = not running, 2 = starting, 3 = running, 4 = stopping | ||
| MI | 2 | Operating Mode | Read | 1 = cool, 2 = heat, 3 = ice, 4 = free cooling | ||
| MI | 3 | Front Panel Chiller Mode | Read | 1 = cool, 2 = heat, 3 = ice, 4 = free cooling | ||
| MI | 4 | Setpoint Source | Read | 1 = BAS/Ext/ FP, 2 = Ext/FP, 3 = front panel | ||
| MI | 5 | Active Chilled Water Setpoint Source | Read | 1 = front panel, 2 = external, 3 = ice machine, 4 = BAS | ||
| MI | 6 | Active Demand Limit Setpoint Source | Read | 1 = front panel, 2 = external, 3 = ice machine, 4 = BAS | ||
| MI | 7 | External Auto Stop | Read | 1 = stop, 2 = auto | ||
| MI | 8 | Front Panel Auto/Stop | Read | 1 = stop, 2 = auto | ||
| MI | 9 | Active Hot Water Setpoint Source | Read | 1 = front panel, 2 = external, 3 = BAS | ||
| MI | 10 | Capacity Control Mode Status Ckt1 | Read | 1 = available, 3 = cooling, 4 = heating, 5 = defrost, 6 = not available | ||
| MI | 11 | Capacity Control Mode Status Ckt2 | Read | 1 = available, 3 = cooling, 4 = heating, 5 = defrost, 6 = not available | ||
| MVmin | 1 | BAS Chiller Auto Stop Command | Write | 1 = stop, 2 = auto | ||
| MVmin | 2 | BAS Chiller Mode Command | Write | 1 = cool, 2 = heat, 3 = ice | ||
| MV | 3 | BAS Free Cooling Auto Stop Command | Write | 1 = stop, 2 = auto |
No points match these filters.
Integration notes
- Only the points that apply to the unit's factory configuration show up; the doc lists every possible point.
- The chiller tables have no read/write column: AI/BI/MI are read-only, and AV/BV/MV are the BAS command and setpoint objects, marked writable here per Trane's naming convention.
- Trane titles this list 'ACSA (UC800)' and does not explain the suffix in the document. This list uses short instance numbers (AI 1, AV 1, BI 506...) unlike the standard Symbio 800 lists with 5-digit instances, so check which list matches the controller on site.
- The analog tables give the data type ('Real') instead of units, so units are left blank; the communicated unit system (I-P or SI) is set at the factory.
- The diagnostic BIs (BI 506 and up) have no state text in the doc; several share a name without a circuit or compressor suffix (e.g. six 'Comm Loss: Compressor Fault Input').
- MI 10 and MI 11 skip state 2 in the doc.
- The Symbio 800 integration guide (BAS-SVP083) covers BACnet IP and BACnet MS/TP; the rotary address sets the MS/TP MAC and a default Device ID of 1-127, and a software Device ID can be set instead.
- The same document also maps every object to a Modbus register; only the BACnet side is listed here.
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 ACSA (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 ACSA (UC800)
How many BACnet points does the Trane Symbio 800 ACSA (UC800) have?
This list has 342 BACnet objects: 58 analog inputs, 4 analog values, 260 binary inputs, 6 binary values, 11 multi-state inputs, 3 multi-state values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Trane Symbio 800 ACSA (UC800) BACnet points are writable?
13 of the 342 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 ACSA (UC800) BACnet documentation?
The source is Symbio 800 Integration Points List BACnet - ACSA (UC800) (BAS-PTS026A-EN), revision 12/6/2024, published free by Trane at https://elibrary.tranetechnologies.com/public/commercial-hvac/Literature/Points%20List/BAS-PTS026A-EN_12062024.pdf.
What are the minimum BACnet points to integrate the Trane Symbio 800 ACSA (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 1 Chilled Water Setpoint (Chilled water setpoint from the BMS); AV 3 Demand Limit Setpoint (Capacity (demand) 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 4 Evaporator Leaving Water Temperature (Leaving chilled water temperature); AI 21 Actual Running Capacity (Actual running capacity in percent); BI 10 Alarm Present (Any active alarm on the chiller).
How do I enable BMS control of the Trane Symbio 800 ACSA (UC800)?
MV 1 BAS Chiller Auto Stop Command (1 = Stop, 2 = Auto) is the BMS auto/stop; with it at Auto the chiller runs when its own run conditions are met. MI 7 External Auto Stop reports the hardwired external auto/stop input, and BI 1 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 2 Local Setpoint Control shows when the chiller is using local setpoints instead of BAS setpoints, and MI 5 Active Chilled Water Setpoint Source shows front panel, external, ice machine or BAS.
Does the Trane Symbio 800 ACSA (UC800) need a BACnet heartbeat or have a communication timeout?
No timeout or heartbeat is described. The list includes the diagnostic flags BI 881 'BAS Communication Lost', BI 882 'BAS Failed to Establish Communication' and BI 600 '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 ACSA (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
- Rooftop unit communication interface (ReliaTel)
Trane BCI2-R (ReliaTel)
Trane packaged rooftop units with ReliaTel controls (Voyager, Precedent, Odyssey) fitted with the BCI2-R BACnet card.
Also known as: BCI2-R, BCI2R, ReliaTel BACnet interface, BACnet Communication Interface for ReliaTel, BAS-SVP053, Voyager, Precedent, Odyssey - Water-source heat pump controller
Trane Symbio 400-B/500 Water-Source Heat Pump
Trane water-source heat pumps controlled by a Symbio 400-B or Symbio 500 programmable controller.
Also known as: Symbio 400-B, Symbio 400B, Symbio 500, Symbio WSHP, BAS-SVP061B-EN - Self-contained unit controller
Trane Symbio 500 Commercial Self-Contained (SWUD)
Trane commercial self-contained (SWUD) units controlled by a Symbio 500.
Also known as: Symbio 500, SWUD, Commercial Self-Contained, CSC, BAS-PTS038 - Self-contained unit controller
Trane Symbio 500 Modular Self-Contained (SCWM)
Trane modular self-contained (SCWM) units controlled by a Symbio 500.
Also known as: Symbio 500, SCWM, Modular Self-Contained, BAS-PTS037 - Split system controller
Trane Symbio 700 Odyssey
Trane Odyssey split systems controlled by a Symbio 700.
Also known as: Symbio 700, Odyssey split system, BAS-PTS005 - Rooftop unit controller
Trane Symbio 700 Precedent / Axiom
Trane Precedent packaged rooftop units and Axiom rooftop water-source heat pumps with the Symbio 700 controller.
Also known as: Symbio 700, Symbio700, Precedent rooftop, Axiom rooftop WSHP, BAS-PTS001 - Air-cooled chiller controller
Trane Symbio 800 ACRB Small (UC800)
Trane ACRB Small air-cooled chillers whose Symbio 800 points list Trane tags '(UC800)'.
Also known as: ACRB, ACRB Small, ACRB UC800, Symbio 800 ACRB, BAS-PTS025 - Water-cooled centrifugal chiller controller
Trane Symbio 800 Agility (HDWA / HDDA)
Trane Agility water-cooled centrifugal chillers (model HDWA and HDDA per the model information point) with Symbio 800 controls.
Also known as: Agility, HDWA, HDDA, Agility water-cooled chiller, Symbio 800 Agility, BAS-PTS007 - Air-cooled chiller controller
Trane Symbio 800 Ascend ACR Series C
Trane Ascend model ACR Series C air-cooled chillers with Symbio 800 controls.
Also known as: Ascend ACR, ACR Series C, Ascend air-cooled chiller, Symbio 800 Ascend ACR, BAS-PTS021 - Air-cooled chiller controller
Trane Symbio 800 Ascend ACS / ACX
Trane Ascend model ACS and ACX air-cooled scroll chillers with Symbio 800 controls.
Also known as: Ascend ACS, Ascend ACX, Ascend air-cooled chiller, Symbio 800 Ascend, BAS-PTS011 - Centrifugal chiller controller
Trane Symbio 800 CenTraVac (Duplex)
Two-compressor (duplex) Trane CenTraVac water-cooled centrifugal chillers with Symbio 800 controls.
Also known as: CenTraVac Duplex, CDHH, CDHF, Symbio 800 CenTraVac, BAS-PTS009 - Centrifugal chiller controller
Trane Symbio 800 CenTraVac (Simplex)
Single-compressor (simplex) Trane CenTraVac water-cooled centrifugal chillers with Symbio 800 controls.
Also known as: CenTraVac, CVHE, CVHF, CVHH, Symbio 800 CenTraVac, BAS-PTS009 - Centrifugal chiller controller
Trane Symbio 800 CenTraVac Simplex (UC800)
Trane CenTraVac (CTV) simplex centrifugal chillers whose Symbio 800 points list Trane tags '(UC800)'.
Also known as: CenTraVac, CTV, CTV-Simplex, CenTraVac UC800, Symbio 800 CenTraVac, BAS-PTS029 - Air-cooled scroll chiller controller
Trane Symbio 800 CGAM
Trane CGAM air-cooled scroll chillers with Symbio 800 controls.
Also known as: CGAM, CGAM air-cooled chiller, Symbio 800 CGAM, BAS-PTS019 - Air-cooled scroll chiller controller
Trane Symbio 800 CGAM (CH530)
Trane CGAM air-cooled scroll chillers whose Symbio 800 points list Trane tags '(CH530)'.
Also known as: CGAM, CGAM CH530, CH530 CGAM, Symbio 800 CGAM, BAS-PTS027 - Water-cooled centrifugal chiller controller
Trane Symbio 800 HDWA (UC800)
Trane HDWA water-cooled chillers whose Symbio 800 points list Trane tags '(UC800)'.
Also known as: HDWA, Agility HDWA, HDWA UC800, Symbio 800 HDWA, BAS-PTS028 - Split system controller
Trane Symbio 800 IntelliCore Split System (RAUK)
Trane IntelliCore split systems (RAUK) controlled by a Symbio 800.
Also known as: IntelliCore, RAUK, IntelliCore split system, Symbio 800, BAS-PTS036 - Rooftop unit / air handler controller
Trane Symbio 800 IntelliPak
Trane IntelliPak large packaged rooftop units running the Symbio 800 controller.
Also known as: Symbio 800, IntelliPak rooftop, IntelliPak with Symbio 800, BAS-PTS003 - Air-cooled screw chiller controller
Trane Symbio 800 RTAC
Trane RTAC air-cooled helical-rotary chillers with Symbio 800 controls.
Also known as: RTAC, Series R RTAC, RTAC air-cooled chiller, BAS-PTS023 - Air-cooled screw chiller controller
Trane Symbio 800 RTAC (CH530)
Trane RTAC air-cooled helical-rotary chillers covered by Trane's 'RTAC (CH530)' Symbio 800 points list.
Also known as: RTAC, Series R RTAC, RTAC CH530, CH530, BAS-PTS031 - Air-cooled screw chiller controller
Trane Symbio 800 RTAC (UC800)
Trane RTAC air-cooled helical-rotary chillers covered by Trane's 'RTAC (UC800)' Symbio 800 points list.
Also known as: RTAC, Series R RTAC, RTAC UC800, UC800, BAS-PTS032 - Water-cooled screw chiller controller
Trane Symbio 800 RTHD (CH530)
Trane RTHD water-cooled helical-rotary chillers covered by Trane's 'RTHD (CH530)' Symbio 800 points list.
Also known as: RTHD, Series R RTHD, RTHD CH530, CH530, BAS-PTS033 - Water-cooled screw chiller controller
Trane Symbio 800 RTHD (UC800)
Trane RTHD water-cooled helical-rotary chillers covered by Trane's 'RTHD (UC800)' Symbio 800 points list.
Also known as: RTHD, Series R RTHD, RTHD UC800, UC800, BAS-PTS034 - Water-cooled screw chiller controller
Trane Symbio 800 RTWD (CH530)
Trane RTWD water-cooled helical-rotary chillers covered by Trane's 'RTWD (CH530)' Symbio 800 points list.
Also known as: RTWD, Series R RTWD, RTWD CH530, CH530, BAS-PTS035 - Water-cooled screw chiller controller
Trane Symbio 800 Series R RTHD
Trane Series R model RTHD water-cooled helical-rotary chillers with Symbio 800 controls.
Also known as: RTHD, Series R RTHD, RTHD water-cooled chiller, Symbio 800 RTHD, BAS-PTS015 - Water-cooled screw chiller controller
Trane Symbio 800 Series R RTWD
Trane Series R model RTWD water-cooled helical-rotary chillers with Symbio 800 controls.
Also known as: RTWD, Series R RTWD, Series R water-cooled chiller, BAS-PTS017 - Air-cooled screw chiller controller
Trane Symbio 800 Sintesis RTAF
Trane Sintesis model RTAF air-cooled helical-rotary chillers with Symbio 800 controls.
Also known as: Sintesis RTAF, RTAF, Sintesis air-cooled chiller, Symbio 800 Sintesis, BAS-PTS013
Source: Symbio 800 Integration Points List BACnet - ACSA (UC800) · BAS-PTS026A-EN · rev. 12/6/2024. Object names, instances and units are reproduced as published; descriptions are our own.