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Air-cooled screw chiller controller · BACnet points list
Trane Symbio 800 RTAC (UC800) BACnet points list
Updated 28 October 2026
A Symbio 800 list of about 335 objects for RTAC chillers marked UC800, with small instance numbers. About 240 are diagnostic binary inputs (BI 500 and up); the rest are temperatures, pressures, motor currents and run data. The BAS writes chilled water setpoint and current limit (AV), auto/stop and mode (MV) and diagnostic reset (BV).
This page lists 335 BACnet objects for the Trane Symbio 800 RTAC (UC800) — 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 (UC800)
- Equipment
- Air-cooled screw chiller controller
- Equipment type
- Chillers
- BACnet objects
- 335 (5 writable)
- Transport
- BACnet IP, BACnet MS/TP
- Firmware
- Not stated
- Also known as
- RTAC, Series R RTAC, RTAC UC800, UC800, BAS-PTS032
BMS integration notes: Trane Symbio 800 RTAC (UC800)
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.
| 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/ice mode command | Write |
| AV 1 | BAS Chilled Water Setpoint | Chilled water setpoint from the BMS | Write |
| AV 2 | BAS Current Limit Setpoint | Current limit from the BMS, % RLA | Write |
| BI 4 | Chiller Running Indicator | Chiller on/off status | Read |
| BI 2 | Local Setpoint Control | Shows if local setpoints override BAS setpoints | Read |
| AI 45 | Evaporator Leaving Water Temp | Leaving chilled water temperature | Read |
| AI 5 | Actual Running Capacity | Actual running capacity in percent | Read |
| BI 23 | Alarm Present | Any active alarm on the chiller | Read |
Enable & remote start
MV 1 BAS Chiller Auto Stop Command (1 = Stop, 2 = Auto; relinquish default Auto) is the BMS auto/stop. BI 1 Run Enabled shows stop/auto. 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.
Heartbeat & communication loss
No timeout or heartbeat is described. BI 742 'Comm Loss: Local BAS Interface' is a diagnostic flag; the document doesn't say what the chiller does when it is 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.
- This list has no read/write column; writability of the command and setpoint objects is inferred from their object type and relinquish defaults.
- Relinquish defaults: AV 1 44 °F (6.7 °C), AV 2 100 % RLA, MV 1 Auto, MV 2 Cool. Releasing MV 1 leaves the chiller in Auto.
- Mode states skip 2: MV 2 and MI 2 use 1 = Cool and 3 = Ice.
- Diagnostic BIs are one object per alarm condition and only exist for the options fitted.
Trane Symbio 800 RTAC (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 Chilled Water Setpoint | Read | |||
| AI | 2 | Active Current Limit Setpoint | Read | |||
| AImin | 5 | Actual Running Capacity | Read | |||
| AI | 6 | Evaporator Refrigerant Pressure - Ckt1 | Read | |||
| AI | 9 | Evaporator Refrigerant Pressure - Ckt 2 | Read | |||
| AI | 12 | Evaporator Saturated Refrigerant Temperature- Ckt 1 | Read | |||
| AI | 14 | Evaporator Saturated Refrigerant Temperature- Ckt 2 | Read | |||
| AI | 16 | Condenser Refrigerant Pressure - Ckt 1 | Read | |||
| AI | 18 | Condenser Refrigerant Pressure - Ckt 2 | Read | |||
| AI | 20 | Condenser Saturated Refrigerant Temperature - Ckt 1 | Read | |||
| AI | 22 | Condenser Saturated Refrigerant Temperature - Ckt 2 | Read | |||
| AI | 25 | Local Atmospheric Pressure | Read | |||
| AI | 26 | Starts- Compressor 1A | Read | |||
| AI | 27 | Starts- Compressor 1B | Read | |||
| AI | 28 | Starts- Compressor 2A | Read | |||
| AI | 29 | Starts- Compressor 2B | Read | |||
| AI | 34 | Run Time- Compressor 1A | Read | |||
| AI | 35 | Run Time- Compressor 1B | Read | |||
| AI | 36 | Run Time- Compressor 2A | Read | |||
| AI | 37 | Run Time- Compressor 2B | Read | |||
| AI | 42 | Airflow Percentage- Circuit 1 | Read | |||
| AI | 43 | Airflow Percentage- Circuit 2 | Read | |||
| AI | 44 | Evaporator Entering Water Temp | Read | |||
| AImin | 45 | Evaporator Leaving Water Temp | Read | |||
| AI | 48 | High Side Oil Pressure - Compressor 1A | Read | |||
| AI | 49 | High Side Oil Pressure - Compressor 1B | Read | |||
| AI | 50 | High Side Oil Pressure - Compressor 2A | Read | |||
| AI | 51 | High Side Oil Pressure - Compressor 2B | Read | |||
| AI | 52 | Oil Temp - Compressor 1A | Read | |||
| AI | 53 | Oil Temp - Compressor 1B | Read | |||
| AI | 54 | Oil Temp - Compressor 2A | Read | |||
| AI | 55 | Oil Temp - Compressor 2B | Read | |||
| AI | 57 | Outdoor Air Temperature | Read | |||
| AI | 59 | Motor Voltage AB Starter 1A | Read | |||
| AI | 60 | Motor Voltage AB Starter 1B | Read | |||
| AI | 61 | Motor Voltage AB Starter 2A | Read | |||
| AI | 71 | Motor Current L1 Starter 1A | Read | |||
| AI | 72 | Motor Current L2 Starter 1A | Read | |||
| AI | 73 | Motor Current L3 Starter 1A | Read | |||
| AI | 74 | Motor Current L1 Starter 1B | Read | |||
| AI | 75 | Motor Current L2 Starter 1B | Read | |||
| AI | 76 | Motor Current L3 Starter 1B | Read | |||
| AI | 77 | Motor Current L1 Starter 2A | Read | |||
| AI | 78 | Motor Current L2 Starter 2A | Read | |||
| AI | 79 | Motor Current L3 Starter 2A | Read | |||
| AI | 80 | Motor Current L1 Starter 2B | Read | |||
| AI | 81 | Motor Current L2 Starter 2B | Read | |||
| AI | 82 | Motor Current L3 Starter 2B | Read | |||
| AI | 83 | Motor Current L1 % RLA Starter 1A | Read | |||
| AI | 84 | Motor Current L2 % RLA Starter 1A | Read | |||
| AI | 85 | Motor Current L3 % RLA Starter 1A | Read | |||
| AI | 86 | Motor Current L1 % RLA Starter 1B | Read | |||
| AI | 87 | Motor Current L2 % RLA Starter 1B | Read | |||
| AI | 88 | Motor Current L3 % RLA Starter 1B | Read | |||
| AI | 89 | Motor Current L1 % RLA Starter 2A | Read | |||
| AI | 90 | Motor Current L2 % RLA Starter 2A | Read | |||
| AI | 91 | Motor Current L3 % RLA Starter 2A | Read | |||
| AI | 92 | Motor Current L1 % RLA Starter 2B | Read | |||
| AI | 93 | Motor Current L2 % RLA Starter 2B | Read | |||
| AI | 94 | Motor Current L3 % RLA Starter 2B | Read | |||
| AI | 95 | Number of Circuits | Read | |||
| AI | 96 | Number of Compressors, Ckt 1 | Read | |||
| AI | 97 | Number of Compressors, Ckt 2 | Read | |||
| AI | 98 | Chiller Design Capacity | Read | |||
| AI | 100 | Output Power AFD 1A | Read | |||
| AI | 101 | Output Power AFD 2A | Read | |||
| AI | 102 | Discharge Temperature Cprsr 1A | Read | |||
| AI | 103 | Discharge Temperature Cprsr 2A | Read | |||
| AI | 106 | Frequency Command Cprsr 1A | Read | |||
| AI | 107 | Frequency Command Cprsr 2A | Read | |||
| AI | 108 | Average Motor Current % RLA AFD 1A | Read | |||
| AI | 109 | Average Motor Current % RLA AFD 2A | Read | |||
| AVmin | 1 | BAS Chilled Water Setpoint | Write | |||
| AVmin | 2 | BAS Current Limit Setpoint | Write | |||
| BI | 1 | Run Enabled | Read | 0 = Stop, 1 = Auto | ||
| BImin | 2 | Local Setpoint Control | Read | 0 = Remote, 1 = Local | ||
| BI | 3 | Chiller Limit Mode Indicator | Read | 0 = Not limited, 1 = Limited | ||
| BImin | 4 | Chiller Running Indicator | Read | 0 = Off, 1 = On | ||
| BI | 6 | Maximum Capacity | Read | 0 = Off, 1 = On | ||
| BI | 9 | Compressor 1A Running | Read | 0 = Off, 1 = Running | ||
| BI | 10 | Compressor 1B Running | Read | 0 = Off, 1 = Running | ||
| BI | 11 | Compressor 2A Running | Read | 0 = Off, 1 = Running | ||
| BI | 12 | Compressor 2B Running | Read | 0 = Off, 1 = Running | ||
| BI | 17 | Evaporator Water Pump Command | Read | 0 = Off, 1 = On | ||
| BI | 22 | Evaporator Water Flow Status | Read | 0 = No flow, 1 = Flow | ||
| BImin | 23 | Alarm Present | Read | 0 = No alarm, 1 = Alarm | ||
| BI | 24 | Shutdown Alarm Present | Read | 0 = No alarm, 1 = Alarm | ||
| BI | 500 | AFD Fault – 1A | Read | |||
| BI | 502 | AFD Fault–2A | Read | |||
| BI | 504 | AFD Motor Current Overload – 1A | Read | |||
| BI | 506 | AFD Motor Current Overload – 2A | Read | |||
| BI | 508 | AFD Interrupt Failure – 1A | Read | |||
| BI | 510 | AFD Interrupt Failure – 2A | Read | |||
| BI | 512 | Starter Did Not Transition - 1A | Read | |||
| BI | 513 | Starter Did Not Transition - 1B | Read | |||
| BI | 514 | Starter Did Not Transition - 2A | Read | |||
| BI | 515 | Starter Did Not Transition - 2B | Read | |||
| BI | 516 | Phase Reversal - 1A | Read | |||
| BI | 517 | Phase Reversal - 1B | Read | |||
| BI | 518 | Phase Reversal - 2A | Read | |||
| BI | 519 | Phase Reversal - 2B | Read | |||
| BI | 520 | Starter Dry Run Test - 1A | Read | |||
| BI | 521 | Starter Dry Run Test- 1B | Read | |||
| BI | 522 | Starter Dry Run Test - 2A | Read | |||
| BI | 523 | Starter Dry Run Test - 2B | Read | |||
| BI | 524 | Phase Loss - 1A | Read | |||
| BI | 525 | Phase Loss - 1B | Read | |||
| BI | 526 | Phase Loss-2A | Read | |||
| BI | 527 | Phase Loss-2B | Read | |||
| BI | 528 | Power Loss - 1A | Read | |||
| BI | 529 | Power Loss - 1B | Read | |||
| BI | 530 | Power Loss - 2A | Read | |||
| BI | 531 | Power Loss - 2B | Read | |||
| BI | 532 | Severe CurrentPhase UnbalanceImbalance - Cprsr 1A | Read | |||
| BI | 533 | Severe CurrentPhase UnbalanceImbalance - Cprsr 1B | Read | |||
| BI | 534 | Severe CurrentPhase UnbalanceImbalance - Cprsr 2A | Read | |||
| BI | 535 | Severe CurrentPhase UnbalanceImbalance - Cprsr 2B | Read | |||
| BI | 536 | Starter Fault Type I – 1A | Read | |||
| BI | 537 | Starter Fault Type I – 1B | Read | |||
| BI | 538 | Starter Fault Type I – 2A | Read | |||
| BI | 539 | Starter Fault Type I –2B | Read | |||
| BI | 540 | Starter Fault Type II – 1A | Read | |||
| BI | 541 | Starter Fault Type II –1B | Read | |||
| BI | 542 | Starter Fault Type II –2A | Read | |||
| BI | 543 | Starter Fault Type II – 2B | Read | |||
| BI | 544 | Starter Fault Type III – 1A | Read | |||
| BI | 545 | Starter Fault Type III –1B | Read | |||
| BI | 546 | Starter Fault Type III –2A | Read | |||
| BI | 547 | Starter Fault Type III –2B | Read | |||
| BI | 548 | Transition Complete Input Shorted –1A | Read | |||
| BI | 549 | Transition Complete Input Shorted –1B | Read | |||
| BI | 550 | Transition Complete Input Shorted –2A | Read | |||
| BI | 551 | Transition Complete Input Shorted –2B | Read | |||
| BI | 552 | Transition Complete Input Opened –1A | Read | |||
| BI | 553 | Transition Complete Input Opened –1B | Read | |||
| BI | 554 | Transition Complete Input Opened –2A | Read | |||
| BI | 555 | Transition Complete Input Opened –2B | Read | |||
| BI | 556 | Motor Current Overload Trip - Cprsr 1A | Read | |||
| BI | 557 | Motor Current Overload Trip - Cprsr 1B | Read | |||
| BI | 558 | Motor Current Overload Trip - Cprsr 2A | Read | |||
| BI | 559 | Motor Current Overload Trip - Cprsr 2B | Read | |||
| BI | 560 | Starter Contactor Interrupt Failure - 1A | Read | |||
| BI | 561 | Starter Contactor Interrupt Failure - 1B | Read | |||
| BI | 562 | Starter Contactor Interrupt Failure - 2A | Read | |||
| BI | 563 | Starter Contactor Interrupt Failure - 2B | Read | |||
| BI | 564 | Over Voltage | Read | |||
| BI | 565 | Under Voltage | Read | |||
| BI | 566 | MP: Reset Has Occurred | Read | |||
| BI | 567 | Low Evaporator Rfgt Temperature - Ckt1 | Read | |||
| BI | 568 | Low Evaporator Rfgt Temperature - Ckt2 | Read | |||
| BI | 569 | Low Oil Flow - Cprsr 1A | Read | |||
| BI | 570 | Low Oil Flow - Cprsr 1B | Read | |||
| BI | 571 | Low Oil Flow- Cprsr 2A | Read | |||
| BI | 572 | Low Oil Flow - Cprsr 2B | Read | |||
| BI | 573 | Low Differential Rfgt Pressure - Ckt1 | Read | |||
| BI | 574 | Low Differential Rfgt Pressure - Ckt2 | Read | |||
| BI | 575 | High Differential Rfgt Pressure - Ckt1 | Read | |||
| BI | 576 | High Differential Rfgt Pressure - Ckt2 | Read | |||
| BI | 577 | High Oil Temperature – 1A | Read | |||
| BI | 578 | High Oil Temperature –1B | Read | |||
| BI | 579 | High Oil Temperature –2A | Read | |||
| BI | 580 | High Oil Temperature – 2B | Read | |||
| BI | 581 | Oil Temperature Sensor – 1A | Read | |||
| BI | 582 | Oil Temperature Sensor – 1B | Read | |||
| BI | 583 | Oil Temperature Sensor–2A | Read | |||
| BI | 584 | Oil Temperature Sensor–2B | Read | |||
| BI | 585 | Evaporator Liquid Level Sensor– Ckt1 | Read | |||
| BI | 586 | Evaporator Liquid Level Sensor– Ckt2 | Read | |||
| BI | 587 | Condenser Fan VFD Fault - Ckt 1 Dr 1 | Read | |||
| BI | 588 | Condenser Fan VFD Fault - Ckt1 Dr 2 | Read | |||
| BI | 589 | Condenser Fan VFD Fault - Ckt2 Dr 1 | Read | |||
| BI | 590 | Condenser Fan VFD Fault - Ckt2 Dr 2 | Read | |||
| BI | 593 | Low Evaporator Liquid Level – Ckt1 | Read | |||
| BI | 594 | Low Evaporator Liquid Level – Ckt2 | Read | |||
| BI | 595 | High Evaporator Liquid Level – Ckt1 | Read | |||
| BI | 596 | High Evaporator Liquid Level – Ckt2 | Read | |||
| BI | 597 | Evaporator Rfgt Drain – Circuit 1 | Read | |||
| BI | 598 | Evaporator Rfgt Drain – Circuit 2 | Read | |||
| BI | 599 | External Chilled Water Setpoint | Read | |||
| BI | 600 | External Current Limit Setpoint | Read | |||
| BI | 601 | Evap Water Flow (Entering Water Temp) | Read | |||
| BI | 602 | Evaporator Entering Water Temp Sensor | Read | |||
| BI | 603 | Evaporator Leaving Water Temp Sensor | Read | |||
| BI | 604 | Condenser Rfgt Pressure Transducer - Ckt1 | Read | |||
| BI | 605 | Condenser Rfgt Pressure Transducer - Ckt2 | Read | |||
| BI | 606 | Suction Refrigerant Pressure Sensor- 1A | Read | |||
| BI | 607 | Suction Refrigerant Pressure Sensor - 1B | Read | |||
| BI | 608 | Suction Refrigerant Pressure Sensor - 2A | Read | |||
| BI | 609 | Suction Refrigerant Pressure Sensor - 2B | Read | |||
| BI | 610 | Intermediate Oil Press Xdcr - Cprsr 1A | Read | |||
| BI | 611 | Intermediate Oil Press Xdcr - Cprsr 1B | Read | |||
| BI | 612 | Intermediate Oil Press Xdcr - Cprsr 2A | Read | |||
| BI | 613 | Intermediate Oil Press Xdcr - Cprsr 2B | Read | |||
| BI | 614 | Oil Flow Protection Fault - 1A | Read | |||
| BI | 615 | Oil Flow Protection Fault - 1B | Read | |||
| BI | 616 | Oil Flow Protection Fault - 2A | Read | |||
| BI | 617 | Oil Flow Protection Fault - 2B | Read | |||
| BI | 618 | Low Suction Rfgt Pressure – Ckt 1 | Read | |||
| BI | 620 | Low Suction Rfgt Pressure – Ckt 2 | Read | |||
| BI | 622 | Very Low Evaporator Rfgt Pressure - Ckt1 | Read | |||
| BI | 623 | Very Low Evaporator Rfgt Pressure - Ckt2 | Read | |||
| BI | 624 | Pumpdown Terminated - Ckt1 | Read | |||
| BI | 625 | Pumpdown Terminated - Ckt2 | Read | |||
| BI | 626 | Low Evaporator Water Temp (Unit Off) | Read | |||
| BI | 627 | Low Evaporator Temp (Unit Off) - Ckt1 | Read | |||
| BI | 628 | Low Evaporator Temp (Unit Off) - Ckt2 | Read | |||
| BI | 629 | Low Evap Leaving Water Temp: Unit On | Read | |||
| BI | 630 | Evaporator Water Flow Overdue | Read | |||
| BI | 631 | Evaporator Water Flow Lost | Read | |||
| BI | 632 | High Evaporator Refrigerant Pressure | Read | |||
| BI | 633 | High Evaporator Water Temperature | Read | |||
| BI | 634 | High Pressure Cutout - Cprsr 1A | Read | |||
| BI | 635 | High Pressure Cutout - Cprsr 1B | Read | |||
| BI | 636 | High Pressure Cutout - Cprsr 2A | Read | |||
| BI | 637 | High Pressure Cutout - Cprsr 2B | Read | |||
| BI | 638 | Emergency Stop | Read | |||
| BI | 639 | Outdoor Air Temperature Sensor | Read | |||
| BI | 640 | Starter Panel Thermostat Cutout - 2A | Read | |||
| BI | 641 | Starter Panel Thermostat Cutout - 1B | Read | |||
| BI | 642 | Starter Panel Thermostat Cutout - 2B | Read | |||
| BI | 643 | Starter Module Memory Error Type 1 - 1A | Read | |||
| BI | 644 | Starter Module Memory Error Type 1 - 1B | Read | |||
| BI | 645 | Starter Module Memory Error Type 1 - 2A | Read | |||
| BI | 646 | Starter Module Memory Error Type 1 - 2B | Read | |||
| BI | 647 | Starter Module Memory Error Type 2 - 1A | Read | |||
| BI | 648 | Starter Module Memory Error Type 2 - 1B | Read | |||
| BI | 649 | Starter Module Memory Error Type 2 - 2A | Read | |||
| BI | 650 | Starter Module Memory Error Type 2 - 2B | Read | |||
| BI | 651 | MP: Invalid Configuration | Read | |||
| BI | 652 | MP Application Memory CRC Error | Read | |||
| BI | 653 | MP: Non-Volatile Memory Reformatted | Read | |||
| BI | 654 | Check Clock | Read | |||
| BI | 655 | MP: Could not Store Starts and Hours | Read | |||
| BI | 656 | MP: Non-Volatile Block Test Error | Read | |||
| BI | 657 | Starter Failed to Arm/Start - 1A | Read | |||
| BI | 658 | Starter Failed to Arm/Start - 1B | Read | |||
| BI | 659 | Starter Failed to Arm/Start - 2A | Read | |||
| BI | 660 | Starter Failed to Arm/Start - 2B | Read | |||
| BI | 661 | Software Error 1001: Call Trane Service | Read | |||
| BI | 662 | Software Error 1002: Call Trane Service | Read | |||
| BI | 663 | Software Error 1003: Call Trane Service | Read | |||
| BI | 664 | Excessive IPC Comm Loss | Read | |||
| BI | 665 | Comm Loss: Slide Valve Unload - 1A | Read | |||
| BI | 666 | Comm Loss: Slide Valve Load - 1A | Read | |||
| BI | 667 | Comm Loss: Slide Valve Unload - 1B | Read | |||
| BI | 668 | Comm Loss: Slide Valve Load - 1B | Read | |||
| BI | 669 | Comm Loss: Slide Valve Unload - 2A | Read | |||
| BI | 670 | Comm Loss: Slide Valve Load - 2A | Read | |||
| BI | 671 | Comm Loss: Slide Valve Unload - 2B | Read | |||
| BI | 672 | Comm Loss: Slide Valve Load - 2B | Read | |||
| BI | 673 | Comm Loss: Step Load - 1A | Read | |||
| BI | 674 | Comm Loss: Step Load - 1B | Read | |||
| BI | 675 | Comm Loss: Step Load - 2A | Read | |||
| BI | 676 | Comm Loss: Step Load - 2B | Read | |||
| BI | 677 | Comm Loss: External Auto/Stop | Read | |||
| BI | 678 | Comm Loss: Emergency Stop | Read | |||
| BI | 679 | Comm Loss: External Ckt Lockout - Ckt1 | Read | |||
| BI | 680 | Comm Loss: External Ckt Lockout - Ckt2 | Read | |||
| BI | 681 | Comm Loss: External Ice Building Command | Read | |||
| BI | 682 | Comm Loss: Outdoor Air Temperature | Read | |||
| BI | 683 | Comm Loss: Evap Leaving Water Temp | Read | |||
| BI | 684 | Comm Loss: Evap Entering Water Temp | Read | |||
| BI | 685 | Comm Loss: Oil Temperature – 1A’ | Read | |||
| BI | 686 | Comm Loss: Oil Temperature – 1B’ | Read | |||
| BI | 687 | Comm Loss: Oil Temperature – 2A’ | Read | |||
| BI | 688 | Comm Loss: Oil Temperature – 2B’ | Read | |||
| BI | 689 | Comm Loss: Ext Chilled Water Setpoint | Read | |||
| BI | 690 | Comm Loss: Ext Current Limit Setpoint | Read | |||
| BI | 691 | Comm Loss: High Pressure Cutout Sw - 1A | Read | |||
| BI | 692 | Comm Loss: High Pressure Cutout Sw - 1B | Read | |||
| BI | 693 | Comm Loss: High Pressure Cutout Sw - 2A | Read | |||
| BI | 694 | Comm Loss: High Pressure Cutout Sw - 2B | Read | |||
| BI | 695 | Comm Loss: Evaporator Water Flow Switch | Read | |||
| BI | 696 | Comm Loss: Condenser Rfgt Pressure - Ckt1 | Read | |||
| BI | 697 | Comm Loss: Condenser Rfgt Pressure - Ckt2 | Read | |||
| BI | 698 | Comm Loss: Intermediate Oil Pressure - 1A | Read | |||
| BI | 699 | Comm Loss: Intermediate Oil Pressure - 1B | Read | |||
| BI | 700 | Comm Loss: Intermediate Oil Pressure - 2A | Read | |||
| BI | 701 | Comm Loss: Intermediate Oil Pressure - 2B | Read | |||
| BI | 702 | Comm Loss: Evaporator Water Pump Relay | Read | |||
| BI | 703 | Comm Loss: Ice Building Status Relay | Read | |||
| BI | 704 | Comm Loss: Suction Rfgt Pressure - 1A | Read | |||
| BI | 705 | Comm Loss: Suction Rfgt Pressure - 1B | Read | |||
| BI | 706 | Comm Loss: Suction Rfgt Pressure - 2A | Read | |||
| BI | 707 | Comm Loss: Suction Rfgt Pressure - 2B | Read | |||
| BI | 708 | Comm Loss: Fan Control Ckt1, Stage 1 | Read | |||
| BI | 709 | Comm Loss: Fan Control Ckt1, Stage 2 | Read | |||
| BI | 710 | Comm Loss: Fan Control Ckt1, Stage 3 | Read | |||
| BI | 711 | Comm Loss: Fan Control Ckt1, Stage 4 | Read | |||
| BI | 712 | Comm Loss: Fan Control Ckt2, Stage 1 | Read | |||
| BI | 713 | Comm Loss: Fan Control Ckt2, Stage 2 | Read | |||
| BI | 714 | Comm Loss: Fan Control Ckt2, Stage 3 | Read | |||
| BI | 715 | Comm Loss: Fan Control Ckt2, Stage 4 | Read | |||
| BI | 716 | Comm Loss: Evap Rfgt Liquid Level - Ckt1 | Read | |||
| BI | 717 | Comm Loss: Evap Rfgt Liquid Level - Ckt2 | Read | |||
| BI | 718 | Comm Loss: Fan Inverter Power- Ckt1 | Read | |||
| BI | 719 | Comm Loss: Fan Inverter Speed Cmd - Ckt1 | Read | |||
| BI | 720 | Comm Loss: Fan Inv Fault, Ckt1, Dr 1 | Read | |||
| BI | 721 | Comm Loss: Fan Inv Fault, Ckt1, Dr 2 | Read | |||
| BI | 722 | Comm Loss: Oil Return Solenoid Valve - 1A | Read | |||
| BI | 723 | Comm Loss: Oil Return Solenoid Valve - 2A | Read | |||
| BI | 724 | Comm Loss: Oil Return Solenoid Valve - 1B | Read | |||
| BI | 725 | Comm Loss: Oil Return Solenoid Valve - 2B | Read | |||
| BI | 726 | Comm Loss: Starter 1A | Read | |||
| BI | 727 | Comm Loss: Starter 1B | Read | |||
| BI | 728 | Comm Loss: Starter 2A | Read | |||
| BI | 729 | Comm Loss: Starter 2B | Read | |||
| BI | 730 | Comm Loss: Electronic Expansion Valve 1 | Read | |||
| BI | 731 | Comm Loss: Electronic Expansion Valve 2 | Read | |||
| BI | 734 | Comm Loss: Fan Inverter Power - Ckt2 | Read | |||
| BI | 735 | Comm Loss: Fan Inverter Speed Cmd - Ckt2 | Read | |||
| BI | 736 | Comm Loss: Fan Inv Fault, Ckt 2, Dr 1 | Read | |||
| BI | 737 | Comm Loss: Fan Inv Fault, Ckt 2, Dr 2 | Read | |||
| BI | 738 | Starter 1A Loss of Comm with MP | Read | |||
| BI | 739 | Starter 1B Loss of Comm with MP | Read | |||
| BI | 740 | Starter 2A Loss of Comm with MP | Read | |||
| BI | 741 | Starter 2B Loss of Comm with MP | Read | |||
| BI | 742 | Comm Loss: Local BAS Interface | Read | |||
| BI | 743 | Comm Loss: Programmable Relay Board 1 | Read | |||
| BI | 744 | Starter Panel Thermostat Comm Loss 2A | Read | |||
| BI | 745 | Starter Panel Thermostat Comm Loss 1B | Read | |||
| BI | 746 | Starter Panel Thermostat Comm Loss 2B | Read | |||
| BI | 747 | Comm Loss: Evap Rfgt Drain Valve - Ckt1 | Read | |||
| BI | 748 | Comm Loss: Evap Rfgt Drain Valve - Ckt2 | Read | |||
| BI | 749 | Comm Loss: AFD 1A | Read | |||
| BI | 750 | Comm Loss: AFD 2A | Read | |||
| BV | 2 | BAS Diagnostic Reset | Write | 0 = false (no reset), 1 = true (can reset) | ||
| MI | 1 | Chiller Running Status | Read | 1 = Chiller off, 2 = Chiller in start mode, 3 = Chiller in run mode, 4 = Chiller in pre-shutdown mode | ||
| MI | 2 | Operating Mode | Read | 1 = Cool, 3 = Ice | ||
| MI | 4 | Refrigerant Type | Read | 5 = R134a, 15 = R514A | ||
| MI | 5 | Model Information | Read | 1 = RTA | ||
| MI | 6 | Cooling Type | Read | 2 = Air cooled | ||
| MI | 7 | Manufacturing Location | Read | 1 = Field Applied, 3 = Pueblo, 4 = Charmes, 14 = Curitiba, 15 = Taicang, 17 = Epinal, 18 = Golbey | ||
| MVmin | 1 | BAS Chiller Auto Stop Command | Write | 1 = Stop, 2 = Auto | ||
| MVmin | 2 | BAS Chiller Mode Command | Write | 1 = Cool, 3 = Ice |
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 tables have no read/write column: AI/BI/MI are read-only, and the AV/BV/MV objects (listed with a relinquish default and valid range) are the BAS setpoints and commands, marked writable here.
- The analog tables give only the data type (Real) instead of engineering units, so units are blank here.
- BI 500 and up are diagnostic flags, one per alarm condition; the document lists their names only, with no state text.
- 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.
- Trane titles this list 'RTAC (UC800)' and does not explain the suffix in the document. Its objects use short instance numbers (AI 1, BI 4...) instead of the 5-digit numbering in the standard Symbio 800 RTAC list (BAS-PTS023), so check which list matches the controller on site.
- The same document also has a Modbus register map; 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 RTAC (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 RTAC (UC800)
How many BACnet points does the Trane Symbio 800 RTAC (UC800) have?
This list has 335 BACnet objects: 72 analog inputs, 2 analog values, 252 binary inputs, 1 binary value, 6 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 RTAC (UC800) BACnet points are writable?
5 of the 335 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 (UC800) BACnet documentation?
The source is Symbio 800 Integration Points List BACnet - RTAC (UC800) (BAS-PTS032A-EN), revision 12/6/2024, published free by Trane at https://elibrary.tranetechnologies.com/public/commercial-hvac/Literature/Points%20List/BAS-PTS032A-EN_12062024.pdf.
What are the minimum BACnet points to integrate the Trane Symbio 800 RTAC (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/ice mode command); AV 1 BAS Chilled Water Setpoint (Chilled water setpoint from the BMS); AV 2 BAS Current Limit Setpoint (Current limit from the BMS, % RLA); BI 4 Chiller Running Indicator (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 (UC800)?
MV 1 BAS Chiller Auto Stop Command (1 = Stop, 2 = Auto; relinquish default Auto) is the BMS auto/stop. BI 1 Run Enabled shows stop/auto. 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.
Does the Trane Symbio 800 RTAC (UC800) need a BACnet heartbeat or have a communication timeout?
No timeout or heartbeat is described. BI 742 'Comm Loss: Local BAS Interface' is a diagnostic flag; the document doesn't say what the chiller does when it is set.
How do I check these points on the real Symbio 800 RTAC (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 - Air-cooled chiller controller
Trane Symbio 800 ACSA (UC800)
Trane ACSA air-cooled chillers whose Symbio 800 points list Trane tags '(UC800)'.
Also known as: ACSA, ACSA UC800, Symbio 800 ACSA, BAS-PTS026 - 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 - 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 - RTAC (UC800) · BAS-PTS032A-EN · rev. 12/6/2024. Object names, instances and units are reproduced as published; descriptions are our own.