Introduction Service Checker Type4 ( order to spare parts by nr . 999176T) : Monitors and enable record data ( saving to hard disk) : 1/ using USB cable ( accessory of checker 4 kit) to communicate to your PC. The power is given by second cable (at checker4 device micro-USB) . 2/ To VRV system by F1F2 line communication ( = DIII connection). The zip file contains all files & sub dir need to run the program. So first create on your hardisk a new (sub) directory ( example chk4 V133) where you keep your service software ( example C:\daikinapps). Then open de zip file, extract all files to the new sub-directory (example C:\daikinapps\chk4 V133) . Select the file "Checker4.exe" to run the program. Your recording data is kept in another directory ( C:users\.....\AppData\Local\Checker4\D3Data) so even making a new directory with new version, your recorded data is kept. Connection to PC/Laptop are : 1/ USB for 5VDC power to checker interface. 2/ USB for data transmission. 3/ prior to connection first time, install the driver. Also included on this web page.