How to connect to CoolPlug DK (Daikin) S21 Old Rev.
DK (Daikin) - When connecting to S21 (Old Rev.)
Connecting the CoolPlug to the Daikin unit Connect the S21 cable supplied with the CoolPlug, between the CoolPlug RJ-11 connector and the S21 port on the indoor unit's PCB. Use Daoikin's installation manual for the location if the S21 socket on the Daikin indoor PCB
Wired Mode: Connect the signal wires of the PBUS between CoolPlug terminals [-], , and  cable coming from the [VDC-], , and  respectively. Please refer to the PBUS connection diagram on Wired connection - PBUS (PlugBus) topology article.
Optional: For connecting the Daikin wired Remote controller (WRC) in parallel with the CoolPlug, the S21 splitter (4) Is required. This part can be purchased from CoolAutomation.
* Master/Slave configuration will be done by the CoolPlug automatically.
** A different Daikin version might have a smaller 5 pin connector. In that case, use a EKRS 32 adapter