This application discloses an installation check system (100, 100B) used for checking installation of an air conditioner before a start of a trail run of the air conditioner. The installation check system (100, 100B) includes a display portion (210) for displaying work instruction information about the installation, an input means (220) configured to be operated for entering a check result based on the work instruction information, a determination portion (340) configured to determine whether the start of the trail run is allowed based on the check result, and a signal generator (350) which generates a drive signal to execute the trail run. The signal generator generates the drive signal under condition of the determination portion allowing the start of the trail run.