FieldBench
Wiring

Daikin FIT / ComfortNet inverter AC

P1 / P2

P1 / P2

DC9VS / DC6VS / DX17VSS FIT. P1/P2 indoor–outdoor. DX16TC / DX13SA / DC5SE are 24V — different diagrams.

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 PDF

P1 / P2

Daikin One / ComfortNet / FIT communicating indoor.

Communicating indoor

P1/P2 to the outdoor. Not S1/S2/S3 Mitsubishi.

  • P1ComfortNet / FITData
  • P2ComfortNet / FITData

FIT outdoor

Same P1/P2. Polarity matters.

  • P1DataData
  • P2DataData

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

  • DataIndoor P1outdoor P1 · P2P2

    Data. Not 24 VAC Y.

  • LineL1 / L2outdoor

    208/230

Prove it

  • Daikin One / ComfortNet sees the outdoor.
  • P1/P2 landing and polarity. Never megger P1/P2.

Do not

  • Do not assume Mitsubishi S1/S2/S3 pinout.
  • Do not apply this to DX13SA / DC5SE / DX16TC.

P1/P2 is the published Daikin ComfortNet / FIT pair.

Plates on this landing