20 
3.2 TROUBLESHOOTING GUIDE 
In general, possible trouble is classified in three kinds. One is called Starting Failure which is caused 
from an electrical defect, another is ineffective Air Conditioning caused by a defect in the refrigeration circuit 
and improper application, and the other is called the Structure Damage. 
ROOM AIRCONDITIONER VOLTAGE LIMITS: 
MODELS NAMEPLATE RATING MINIMUM MAXIMUM 
FOR SINGLE-PHASE   
POWER MODELS 
220~240V 196V 253V 
FOR THREE-PHASE   
POWER MODELS 
Phase voltage 380~420V 
Single phase  220~240V 
338V 
196V 
445V 
253V 
ROOM AIRCONDITIONER TEMPERATURE OPERATION LIMITS: 
Cooling operation 
Outdoor unit air temp.℃ DB 
             45 
 
             40 
 
             35 
 
             30 
 
             25 
 
             20 
 
 
 
Indoor air temp.  ℃ DB          10    15    20     25    30    35  40 
Note: The chart is the result from the continuous operation under constant air temperature conditions.   
However, excludes the initial pull-down stage. 
 
Heating operation 
Indoor air temp.  ℃ DB 
 
     30 
 
     25 
 
     20 
 
     15 
 
     10 
Outdoor unit air temp.℃ DB         -5      5     15     25 
Note : The chart is the result from the continuous operation under constant air temperature conditions. 
However, excludes the initial pull-down stage. 
 
 
 
 
 
 
 
DRY          COOLING