MULTI VRF-Ⅱ  INDOOR UNIT SERVICE MANUAL    EUROPEAN/LATIN AMETICA (R410A) 
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Power-on High-pressure Protection Fault Interface 
Note: If the IDU connected with the current wired controller is a fresh-air IDU, “FAP” is displayed 
on the main interface of the wired controller. Only the outlet temperature can be set for the fresh-
air IDU. For the setting method, see the "IDU Function Settings" section. 
 
 
5.2 Engineering Application Functions Operated through the XK49 Wired Controller 
 
XK49 Wired Controller 
5.2.1 Master IDU Settings 
Method  1:  In  power-off  status,  press  and  hold  the  “MODE”  button  for  five  seconds  to  set  the  IDU 
connected with the current wired controller to master IDU. If the setting is successful, “MASTER” will be