Trane Symbio 800 Ascend ACR Series C BACnet points list

BMS integration notes: Trane Symbio 800 Ascend ACR Series C

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.

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.
• The document says BAS setpoint values go through the controller's arbitration logic, so a written value may not be the one in use.