MULTI VRF-Ⅱ  INDOOR UNIT SERVICE MANUAL    EUROPEAN/LATIN AMETICA (R410A) 
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Engineering parameters can be queried in power-on or power-off status. 
(1)  Press  and  hold  the  “MODE”  and  "SWING"  button  simultaneously  for  five  seconds  to  enter  the 
engineering parameter query interface. The temperature area displays “C00” and “VIEW” is on. 
(2)  In  "C00"  status,  continuously  press  the  “MODE”  button  for  three  times  to  enter  engineering 
parameter query.   
(3)  Select a parameter code by pressing “ ” or “ ”. 
(4)  Press the “SWING” button to return to the upper-level menu till quitting parameter query. 
(5)  For the engineering parameter query list of the XK49 wired controller, refer to the engineering 
parameter query list in XK46 engineering parameter query. 
(6)  Note: In parameter query, the function of "SWING" on the XK49 wired controller is equivalent to the 
function of “ENTER/CANCEL” on the XK46 wired controller. 
5.2.5 Engineering Parameter Settings 
Engineering parameters can be set in power-on or power-off status. 
(1)  Press and hold the “MODE” and "SWING" button simultaneously for five seconds. The temperature 
area displays “C00”. Continuously press the “MODE” button for three times, and then press and 
hold the “MODE” button and "SWING" simultaneously for another five seconds to enter the wired 
controller engineering parameter setting interface. The temperature area displays “P00”. 
(2)  Select a parameter code by pressing “ ” or “ ”. Press the “MODE” button to switch to parameter 
value settings. The parameter value blinks. Adjust the parameter value by pressing “ ” or “ ” and 
then press the “SWING” button to complete settings. 
(3)  Press the “SWING” button to return to the upper-level menu till quitting parameter settings. 
For the engineering parameter setting list of the XK49 wired controller, refer to the engineering setting 
query list in XK46 engineering parameter settings. 
Note: In parameter settings, the function of "SWING" on the XK49 wired controller is equivalent to the 
function of “ENTER/CANCEL” on the XK46 wired controller. 
 
5.3 Engineering Application Functions Operated through the YV1L1 Remote Controller 
The YV1L1 remote controller provides all engineering application functions. It is set to common type by 
default  upon  factory  departure.  It  can  use  engineering  application  functions  only  after  being  set  to 
professional type. The following only describes engineering application functions. For other user 
operation functions, refer to the "Remote Controller Operating Instructions". 
 
Method for setting the professional remote controller: Press "