4.5 Fixing and Damping of Unit ................................................................................................. 64 
4.6 Outline Dimension and Position of Installation Hole ............................................................. 64 
4.7 Installation Space Requirement ........................................................................................... 66 
5 Pipeline Design of Refrigerant .................................................................................... 67 
5.1 Notices for Pipeline Design ................................................................................................. 67 
5.2 Allowable Length and Fall for Refrigerant Pipe In IDU and ODU ......................................... 68 
5.3 Design of Oil Loop ............................................................................................................... 68 
6 Installation of Drain Pipe ............................................................................................. 69 
6.1 Installing the Drain Pipes ..................................................................................................... 69 
6.2 Testing of Drain Piping ......................................................................................................... 71 
7 Electrical Installation ................................................................................................... 71 
DEBUGGING&MAINTENANCE ...................................................................................... 72 
1 Debugging .................................................................................................................... 73 
1.1 Debugging Flow Chart ......................................................................................................... 73 
1.2 Safety Notice ....................................................................................................................... 73 
1.3 Preparation Before Debugging ............................................................................................ 73 
1.4 Debugging Process ............................................................................................................. 76 
1.5 Function Setting(UMD400PH/A-M(P)) ................................................................................. 80 
2 Troubleshooting ........................................................................................................... 82 
3 Wiring Diagram............................................................................................................ 115 
4 Disassembly And Assembly Procedure Of Main Parts ............................................ 119