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Symbio 800 ACSA (UC800)

Air-cooled chiller controller · BACnet points list

Trane Symbio 800 ACSA (UC800) BACnet points list

Updated 28 October 2026

Short answer

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
Source document: Symbio 800 Integration Points List BACnet - ACSA (UC800) · BAS-PTS026A-EN · rev. 12/6/2024

Download CSV 342 rows Download EDE B.I.G.-EU JSON Manufacturer PDF ↗ Compare with your scan Download Easy BACnet Mobile App Google Play

Reference only, provided as-is: verify against Trane’s current documentation and the live device before use. Not official Trane information. Terms of use.

BMS integration notes: Trane Symbio 800 ACSA (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.

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.

342 of 342 shown

Type

Access

Show

Trane Symbio 800 ACSA (UC800) BACnet Points List
				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

Object ID lookup: Trane Symbio 800 ACSA point IDs by name

AI1Active Cool/Heat Water Setpoint Temperature
AI2Front Panel Chilled Water Setpoint
AI3Evaporator Entering Water Temperature
AI4Evaporator Leaving Water Temperature
AI5Active Demand Limit Setpoint
AI6Front Panel Demand Limit Setpoint
AI7Unit Power Consumption
AI8Outdoor Air Temperature
AI9External Chilled/Hot Water Setpoint
AI10External Demand Limit Setpoint
AI11Evaporator Refrigerant Pressure Ckt1
AI12Condenser Refrigerant Pressure Ckt1
AI13Differential Refrigerant Pressure Ckt1
AI14Suction(Evaporator) Saturated Rfgt Temp Ckt1
AI15Condenser Saturated Rfgt Temp Ckt1
AI16Evaporator Refrigerant Pressure Ckt2
AI17Condenser Refrigerant Pressure Ckt2
AI18Differential Refrigerant Pressure Ckt2
AI19Suction(Evaporator) Saturated Rfgt Temp Ckt2
AI20Condenser Saturated Rfgt Temp Ckt2
AI21Actual Running Capacity
AI22Active Heat Recovery Setpoint
AI23Front Panel Hot Water Setpoint
AI24Active Hot Water Setpoint
AI25Liquid Line Temperature Ckt1
AI26Liquid Line Temperature Ckt2
AI27Liquid Line Pressure Ckt1
AI28Liquid Line Pressure Ckt2
AI30Air Flow Ckt1
AI31Air Flow Ckt2
AI35Starts Cprsr1A
AI36Run Time Cprsr1A
AI51Starts Cprsr2A
AI52Run Time Cprsr2A
AI69Heat Recovery Entering Water Temp
AI70Heat Recovery Leaving Water Temp
AI71Chiller Design Capacity
AI128Starts Cprsr1B
AI129Run Time Cprsr1B
AI130Starts Cprsr2B
AI131Run Time Cprsr2B
AI132Number of Circuits
AI133Number of Compressors, Circuit 1
AI134Number of Compressors, Circuit 2
AI136Free Cooling Capacity
AI137Free Cooling Entering Water Temperature
AI138Free Cooling Entering Glycol Temperature
AI139Free Cooling Leaving Glycol Temperature
AI141Energy Consumption NonReset
AI142Energy Consumption Resettable
AI143Starts Cprsr1C
AI144Run Time Cprsr1C
AI145Starts Cprsr2C
AI146Run Time Cprsr2C
AI147Discharge Temperature Ckt1
AI148Discharge Temperature Ckt2
AI149Compressor Discharge Temperature Ckt1
AI150Compressor Discharge Temperature Ckt2
AV1Chilled Water Setpoint
AV2Hot Water Setpoint
AV3Demand Limit Setpoint
AV4BAS Heat Recovery Setpoint
BI1Run Enable
BI2Local Setpoint Control
BI3Limit Mode Relay Status
BI4Chiller Running State
BI5Maximum Capacity Relay
BI6Evaporator Water Pump Command
BI7Evaporator Water Flow Status
BI8Manual Override Exists
BI9Emergency Stop Input
BI10Alarm Present
BI11Running Status Cprsr1A
BI12Running Status Cprsr2A
BI13Running Status Cprsr1B
BI14Running Status Cprsr2B
BI15Free Cooling Active
BI16Heat Recovery Active
BI17Active Heat Recovery Command
BI18Latching Alarm Present, Circuit 1
BI19Latching Alarm Present, Circuit 2
BI20Non-Latching Alarm Present, Circuit 1
BI21Non-Latching Alarm Present, Circuit 2
BI22Running Status Cprsr1C
BI23Running Status Cprsr2C
BI24Emergency Stop Unit Status
BI25Noise Reduction Active
BI26No assignment - reserved as obsolete
BI506Comm Loss: Evaporator Anti-Freeze Heater
BI507Comm Loss: Auxiliary Setpoint Command
BI508Comm Loss: Evaporator Water Flow Switch
BI509Comm Loss: Compressor Fault Input
BI510Comm Loss: Compressor Fault Input
BI511Comm Loss: Compressor Fault Input
BI512Comm Loss: Compressor Fault Input
BI513Comm Loss: Compressor Fault Input
BI514Comm Loss: Compressor Fault Input
BI518Comm Loss: Cond Fan Enbl Shared Ckt 1&2
BI520Comm Loss: Condenser Fan Enable
BI521Comm Loss: Condenser Fan Enable
BI533Comm Loss: Discharge Temperature Sensor
BI534Comm Loss: Discharge Temperature Sensor
BI535Comm Loss: Discharge Pressure Transducer
BI536Comm Loss: Discharge Pressure Transducer
BI537Comm Loss: Electronic Expansion Valve
BI538Comm Loss: Electronic Expansion Valve
BI539Comm Loss: Emergency Stop Feedback Input
BI541Comm Loss: Evap Entering Water Temp
BI543Comm Loss: Evap Leaving Water Temp
BI545Comm Loss: Evap Pump Inv1 Fault Input
BI546Comm Loss: Evap Pump Inv1 Freq Feedback
BI547Comm Loss: Evap Pump Inv1 Run Command
BI550Comm Loss: Evaporator Water Pump 1 Relay
BI551Comm Loss: Evaporator Water Pump 2 Relay
BI556Comm Loss: Ext Chilled Water Setpoint
BI557External Demand Limit Setpoint
BI558Comm Loss: Ext Noise Reduction Request
BI559Comm Loss: External Auto/Stop
BI560Comm Loss: External Ckt Lockout
BI561Comm Loss: External Ckt Lockout
BI562Comm Loss: External Heat Recovery Command
BI563Comm Loss: External Ice Building Command
BI564Comm Loss: Fan Board 1 Relay 1
BI565Comm Loss: Fan Board 1 Relay 1
BI566Comm Loss: Fan Board 1 Relay 2
BI567Comm Loss: Fan Board 1 Relay 2
BI568Comm Loss: Fan Board 1 Relay 3
BI569Comm Loss: Fan Board 1 Relay 3
BI570Comm Loss: Fan Board 1 Relay 4
BI571Comm Loss: Fan Board 1 Relay 4
BI572Comm Loss: Fan Speed Select Board Relay 1
BI574Comm Loss: Fan Speed Select Board Relay 2
BI577Comm Loss: Fan Speed Select Board Relay 3
BI579Comm Loss: Fan Speed Select Board Relay 4
BI582Comm Loss: Fan Inv Spd Cmd, Shrd Ckt1&2
BI585Comm Loss: Fan Inverter Speed Command
BI586Comm Loss: Fan Inverter Speed Command
BI590Comm Loss: High Pressure Cutout Switch
BI591Comm Loss: High Pressure Cutout Switch
BI596Comm Loss: HR Entering Water Temp Sensor
BI597Comm Loss: HR Leaving Water Temp Sensor
BI598Comm Loss: HR Three Way Valve
BI600Comm Loss: Local BAS Interface
BI602Comm Loss: Programmable Relay Board 1
BI603Comm Loss: Outdoor Air Temperature
BI604Comm Loss: Percent Capacity Output
BI605Comm Loss: Phase Protection Fault Input
BI606Comm Loss: Programmable Relay Board 2
BI617Comm Loss: Run Command Compressor A
BI618Comm Loss: Run Command Compressor A
BI619Comm Loss: Run Command Compressor B
BI620Comm Loss: Run Command Compressor B
BI621Comm Loss: Run Command Compressor C
BI622Comm Loss: Run Command Compressor C
BI628Comm Loss: Suction Rfgt Pressure
BI629Comm Loss: Suction Rfgt Pressure
BI630Comm Loss: Suction Temperature
BI631Comm Loss: Suction Temperature
BI636Compressor A Fault
BI637Compressor A Fault
BI638Compressor B Fault
BI639Compressor B Fault
BI640Compressor C Fault
BI641Compressor C Fault
BI642Compressor Fault Lockout
BI643Compressor Fault Lockout
BI644Compressor Fault Lockout
BI645Compressor Fault Lockout
BI646Compressor Fault Lockout
BI647Compressor Fault Lockout
BI650Discharge Pressure Transducer
BI651Discharge Pressure Transducer
BI669Emergency Stop
BI691Evap Pump 1 Starts/Hours Modified
BI692Evap Pump 2 Starts/Hours Modified
BI694Evaporator Entering Water Temp Sensor
BI696Evaporator Leaving Water Temp Sensor
BI698Evaporator Pump 1 Fault
BI699Evaporator Pump 2 Fault
BI700Evaporator Water Flow Lost
BI701Evaporator Water Flow Lost Lockout
BI702Evaporator Water Flow Lost - Pump1
BI703Evaporator Water Flow Lost - Pump2
BI704Evaporator Water Flow Overdue
BI705Evaporator Water Flow Overdue - Pump1
BI706Evaporator Water Flow Overdue - Pump2
BI707Evaporator Water Flow Too Low
BI708External Chilled/Hot Water Setpoint
BI711Heat Recovery Entering Water Temp Sensor
BI712Heat Recovery Leaving Water Temp Sensor
BI713High Compressor Pressure Differential
BI714High Compressor Pressure Differential
BI715High Discharge Refrigerant Pressure
BI716High Discharge Refrigerant Pressure
BI717High Discharge Temperature
BI718High Discharge Temperature
BI731High Discharge Temperature Lockout
BI732High Discharge Temperature Lockout
BI733High Evaporator Water Temperature
BI746High Pressure Cutout
BI747High Pressure Cutout
BI748High Suction Rfgt Pressure
BI768Inverted Evaporator Water Temperature
BI769Inverted Water Temp (Heating)
BI770LCI-C Software Mismatch: Use BAS Tool
BI771Loss of Charge
BI772Loss of Charge
BI775Low Discharge Saturated Temperature
BI776Low Discharge Saturated Temperature
BI777Low Evaporator Water Temp (Unit Off)
BI778Low Evaporator Water Temp (Unit On)
BI779Low Suction Refrigerant Temperature
BI780Low Suction Refrigerant Temperature
BI782Low Suction Refrigerant Pressure
BI783Low Refrigerant Pressure Ratio
BI784Low Refrigerant Pressure Ratio
BI785Low Suction Refrigerant Pressure
BI786Low Suction Superheat
BI787Low Suction Superheat
BI827MP: Invalid Configuration
BI829MP: Reset Has Occurred
BI832Pumpdown Terminated By Time
BI833Outdoor Air Temperature Sensor
BI834Phase Protection Fault
BI835No Total Heat Recovery
BI838Restart Inhibit Invoked - 1A
BI839Restart Inhibit Invoked - 2A
BI840Restart Inhibit Invoked - 1B
BI841Restart Inhibit Invoked - 2B
BI842Restart Inhibit Invoked - 1C
BI843Restart Inhibit Invoked - 2C
BI848Starts/Hours Modified 1C
BI849Starts/Hours Modified 2A
BI850Starts/Hours Modified 1B
BI851Starts/Hours Modified 1A
BI852Starts/Hours Modified 2B
BI853Starts/Hours Modified 2C
BI856Suction Pressure Transducer
BI857Suction Pressure Transducer
BI858Suction Temperature Sensor
BI859Suction Temperature Sensor
BI860Suction Temperature Too High
BI861Suction Temperature Too High
BI862Very Low Suction Pressure - Circuit 1
BI863Very Low Suction Pressure - Circuit 2
BI864Chiller Service Recommended
BI865Pumpdown Terminated By Time
BI866Comm Loss: Energy Meter Pulse Input
BI867Comm Loss: Evap Pump Inverter 1 Speed
BI868Comm Loss: Ext Demand Limit Stpt
BI869Comm Loss: Heat Recovery Anti-Freeze Heater
BI871Comm Loss: Evaporator Pump 1 Fault Input
BI872Comm Loss: Evaporator Pump 2 Fault Input
BI873Evap Water Pump 1 Svc Recommended
BI874Evap Water Pump 2 Svc Recommended
BI875Mfr Maintenance Recommended - 1A
BI876Mfr Maintenance Recommended - 1B
BI877Mfr Maintenance Recommended - 1C
BI878Mfr Maintenance Recommended - 2A
BI879Mfr Maintenance Recommended - 2B
BI880Mfr Maintenance Recommended - 2C
BI881BAS Communication Lost
BI882BAS Failed to Establish Communication
BI883Comm Loss: FC Entering Glycol Temp
BI884Comm Loss: FC Entering Water Temp
BI885Comm Loss: FC Leaving Glycol Temp
BI886Comm Loss: Free Cooling Pump
BI887Comm Loss: Free Cooling Valve
BI888Free Cooling Entering Glycol Temperature
BI889Free Cooling Entering Water Temperature
BI890Free Cooling Glycol Temp Equalization Overdue
BI891Free Cooling Leaving Glycol Temperature
BI892Low Glycol Temperature Free Cooling
BI893Comm Loss: External Heat Recovery Setpoint
BI894Comm Loss: Fan Board 2 Relay 1
BI895Comm Loss: Fan Board 2 Relay 1
BI896Comm Loss: Fan Board 2 Relay 2
BI897Comm Loss: Fan Board 2 Relay 2
BI898Comm Loss: Fan Board 2 Relay 3
BI899Comm Loss: Fan Board 2 Relay 3
BI900Comm Loss: Fan Board 2 Relay 4
BI901Comm Loss: Fan Board 2 Relay 4
BI902External Heat Recovery Setpoint
BI903Comm Loss: HR Refrigerant Bypass Valve
BI904Comm Loss: HR Refrigerant Bypass Valve
BI905Comm Loss: Reversing Valve
BI906Comm Loss: Reversing Valve
BI907Comm Loss: Hot Gas Bypass Valve
BI908Comm Loss: Dynamic Receiver Fill Valve
BI909Comm Loss: Hot Gas Bypass Valve
BI910Comm Loss: Dynamic Receiver Fill Valve
BI912Comm Loss: External Hot Water Command
BI913Comm Loss: Supplemental Heater Relay 1
BI915Comm Loss: Supplemental Heater Relay 2
BI916Comm Loss: Supplemental Heater Relay 3
BI917Comm Loss: Supplemental Heater Relay 4
BI918Comm Loss: Liquid Line Temperature
BI919Comm Loss: Liquid Line Pressure
BI920Liquid Line Temp Sensor
BI921Liquid Line Pressure Transducer
BI922Comm Loss: Liquid Line Temperature
BI923Comm Loss: Liquid Line Pressure
BI924Liquid Line Temp Sensor
BI925Liquid Line Pressure Transducer
BI926Comm Loss: Shared V Coil Isolation Valve
BI927Comm Loss: Shared V Coil Isolation Valve
BI928Free Cooling Glycol Flow Overdue
BI929Comm Loss: Free Cooling Glycol Flow Switch
BI930Comm Loss: Free Cooling Glycol Pressure
BI931Free Cooling Glycol Pressure
BI932Low Glycol Pressure Free Cooling
BI933Comm Loss: Free Cooling Glycol Pump Fault
BI934Free Cooling Glycol Pump Fault
BI935Free Cooling Glycol Flow Lost
BI936SLHX Entering Temp Sensor - Ckt1
BI937Comm Loss: SLHX Valve - Ckt1
BI938Comm Loss: SLHX Entering Refrigerant Temp - Ckt1
BI939SLHX Entering Temp Sensor - Ckt2
BI940Comm Loss: SLHX Valve - Ckt2
BI941Comm Loss: SLHX Entering Refrigerant Temp - Ckt2
BI942Comm Loss: Sump Heater - Ckt1
BI943Comm Loss: Sump Heater - Ckt2
BV2Reset Diagnostic
BV3BAS Noise Reduction Command
BV4BAS Heat Recovery Command
BV5Clear Energy Consumption
BV6BAS Circuit 1 Lockout
BV7BAS Circuit 2 Lockout
MI1Chiller Running Status
MI2Operating Mode
MI3Front Panel Chiller Mode
MI4Setpoint Source
MI5Active Chilled Water Setpoint Source
MI6Active Demand Limit Setpoint Source
MI7External Auto Stop
MI8Front Panel Auto/Stop
MI9Active Hot Water Setpoint Source
MI10Capacity Control Mode Status Ckt1
MI11Capacity Control Mode Status Ckt2
MV1BAS Chiller Auto Stop Command
MV2BAS Chiller Mode Command
MV3BAS Free Cooling Auto Stop Command

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. This list is provided as-is for reference only and may contain mistakes — confirming it before you write, map or commission anything is up to you (terms). 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)?

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

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

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.

Trane Symbio 800 ACSA (UC800) BACnet points list

BMS integration notes: Trane Symbio 800 ACSA (UC800)

Minimum points to map

Enable & remote start

Heartbeat & communication loss

Network setup

Watch out for

Trane Symbio 800 ACSA (UC800) BACnet objects

Integration notes

Questions about the Trane Symbio 800 ACSA (UC800)

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