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(5) AT Option (TUNE button lock/unlock) 
 
 
 
 
 
 
 
 
 
 
 
(a) IPC5000D 
 
 
 
 
 
 
 
 
 
 
 
(b) IPC5000S 
 
Fig. 3.18.4 MON SUB Screen 
 
z  The AT option is used to prevent auto tuning operation.   
z  If the AT option is set to “LOCK”, the channel 1 and 2 section will be hidden in the screen as 
shown in the Figure 3.18.4. Therefore, auto tuning cannot be performed. 
 
 
 
 
 
 
AT Option 
(TUNE1 or TUNE2) 
UNLOCK: Shown 
LOCK: Hidden
 
MENU 
MON SUB 
MV1
TUNE1 
HEAT  COOL