ComfortLink / AccuLink inverter AC
ComfortLink data pair
Trane / American Standard XV18 class. Communicating inverter air conditioner. Not XR16 Y/C. Not XV20i (that outdoor has a reversing valve).
Written circuit description only — FieldBench does not redraw maker schematics. Example: R to W closes on a heat call; verify 24V at W1 before you change the IFC.
Open manufacturer PDFComfortLink pair
Communicating indoor (XC95m / communicating AH) and ComfortLink stat.
ComfortLink control
English events on the wall control. Data, not Y.
- DATA+ComfortLinkData
- DATA−ComfortLinkData
- R24V if the control needs it24V
- CCommon24V
Communicating indoor
S9V2 24V is a mixed pair — do not diagnose the outdoor with furnace E2.1.
- DATA+ComfortLinkData
- DATA−ComfortLinkData
Outdoor drive
Comm LED vs inverter-fault LED. Write both before the disconnect.
- DATA+ComfortLinkData
- DATA−ComfortLinkData
Outdoor line — inverter drive
208/230 into the drive. No contactor slam. DC bus can stay live after the disconnect.
- L1Line to the driveLine
- L2Line to the driveLine
- GNDEquipment groundLine
Landing
- DataStat pairindoor pairoutdoor pair
Data. Not 24 VAC Y.
- LineL1 / L2drive
208/230
Prove it
- ComfortLink event list. Bus vs drive vs pressure vs sensor.
- Weigh-in + line-set. Not an XR16 piston SH chart.
Do not
- Do not apply the XR16 / XR14 Y/C / dual-cap diagram.
- Do not ohm a defrost sensor on XV18. That is XV20i.
DATA+/DATA− here means the ComfortLink pair on the silk — not a made-up J-number.