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Air-cooled chiller controller · BACnet points list

Trane Symbio 800 Ascend ACR Series C BACnet points list

Updated 28 October 2026

Manufacturer

Trane

Model

Symbio 800 Ascend ACR Series C

Equipment

Air-cooled chiller controller

Equipment type

Chillers

BACnet objects

772 (15 writable)

Transport

BACnet IP, BACnet MS/TP

Firmware

Not stated

Also known as

Ascend ACR, ACR Series C, Ascend air-cooled chiller, Symbio 800 Ascend ACR, BAS-PTS021

Source document

Symbio 800 Integration Points List BACnet - Ascend Model ACR Series C · BAS-PTS021A-EN · rev. 11/15/2024

Trane Symbio 800 Ascend ACR Series C 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.

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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.
• Units are listed as a quantity (Temperature, Pressure, Percent...); the communicated engineering unit follows the factory-configured unit system (I-P or SI), not the web UI display setting.
• Binary inputs named 'Diagnostic: ...' are individual alarm flags (0/false = normal, 1/true = in alarm).
• 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.
• The document ends with a table of numeric diagnostic codes and their names; AI 10200 Unit Source ID reports the last diagnostic as a number.
• Trane also publishes a list for Ascend ACS/ACX chillers (BAS-PTS011) with different instance numbers.

Questions about the Trane Symbio 800 Ascend ACR Series C