D.C. Inverter Multi VRF Modular 
53 
04_Confirm the 
quantity of IDUs 
Quantity of 
connected 
IDUs 
If the quantity displayed is the same with actual quantity, then press SW7 confirmation button 
on the master unit to confirm it. Unit will start next progress: 
04_Confirm the 
quantity of IDUs 
Step 9: 
progress 05 is “Detect internal communication” 
If no error is detected, system will display as below and then start next progress. 
05_Detect 
internal 
communication 
Detection is finished. Start next progress. 
If error is detected, system will stay at current progress. Error has to be solved manually. 
Below are relevant errors: 
05_Detect 
internal 
communication 
System detects “driven communication 
error between master unit and inverter 
compressor”.   
System detects “driven communication 
error between master unit and inverter 
fan”. 
IDU/ODU “high proportion of rated 
capacity”. 
IDU/ODU “low proportion of rated 
capacity”. 
Elimination methods of above errors can be found in Troubleshooting. 
Step 10: progress 06 is “Detect outdoor components” 
If no error is detected, system will display as below and then start next progress. 
06_Detect 
outdoor 
components 
No error is detected in outdoor 
components. Start next progress. 
If error is detected, system will stay at current progress. Error has to be solved manually.