ContentsPageSafety Precautions............................................ 21. Introduction ............................................... 51-1. Parts names and functions .............. 51-2. Monitor and operation of the airconditioners...................................... 61-3. About “Group” and “Block” ............... 62. Parts List ................................................... 63. Specifications............................................ 73-1. Product Specifications ..................... 73-2. External dimensions......................... 73-3. Supplying power to the M-NETtransmission lines ............................ 84. System configuration ................................ 94-1. Setting M-NET address forvarious devices .............................. 104-2. M-NET system setting example ..... 125. Installation............................................... 135-1. Field-supplied parts........................ 135-2. M-NET transmission line length ..... 145-3. Installation...................................... 156. Wiring connections.................................. 166-1. Installing and uninstalling the cover .. 166-2. Connecting the power cable andprotective earth cable..................... 166-3. Connecting the M-NETtransmission line ............................ 176-4. Connecting the LAN cable ............. 187. Initial settings .......................................... 197-1. IP address and network settings.... 208. Product features...................................... 219. Test run................................................... 239-1. Batch operation/Stop (error reset)switches ......................................... 239-2. Service LED display....................... 2310. External input/output ............................... 2410-1. External signal input function ......... 2410-2. External signal output function....... 2511. Copy to USB memory and read from USBmemory ................................................... 2611-1. Switch setting................................. 2711-2. Operational data ............................ 2812. 7-segment LED ....................................... 3012-1. 7-segment LED display and switchsettings........................................... 3113. Error code list .......................................... 32Air-Conditioner Network SystemInstallation/Instructions ManualAfter reading this manual, pass the manual on to the enduser to retain for future reference.The users should keep this manual for future reference andrefer to it as necessary. This manual should be madeavailable to those who repair or relocate the units. Makesure that the manual is passed on to any future aircondition system users.Centralized ControllerGB-50ADA-AGB-50ADA-JTo ensure safety and proper operation of theunit, the unit should only be installed byqualified personnel.• Safety notes are marked withWARNING or CAUTION,depending on the severity of possibleconsequences that may result when theinstructions are not followed exactly asstated.Proper installation is important for yoursafety and proper functioning of the units.Thoroughly read the following safetyprecautions prior to installation.