Samsung Electronics 2789-1 Auto Trial Operation9-1-1 Overview of Auto Trial Operation1) What is the Auto Trial Operation?Auto Trial Operation is an operation mode designed to provide guidelines for inspecting the status of the device installation and themain components for quick and accurate troubleshooting. If Auto Trial Operation is not performed, it is not possible to start generaloperation due to UP (Un Prepared) mode.2) Preliminary inspection before Auto Trial Operation(1) Preliminary inspection before Auto Trial Operation (service valve) on the outdoor unit is opened.(2) Indoor: Check the communication and power lines related to the outdoor air.(3) Turn on the system 6 hours before Auto Trial Operation to sufficiently preheat the compressor.(4) Before connecting the power supply, use a voltmeter and phase tester to check the voltage and phase.- R, S, T, N terminals: Make sure that the turn-to-turn voltage is 380-415V (R-S, S-T, T-R) and the phase-to-phase voltage is200-240V (R-N, S-N, T-N).(5) After the power supply is connected, configure devices such as indoor units and MCUs connected to the outdoor unit,and optional settings.After the required settings are configured, the communication status between the outdoor unit and the connected devices ischecked. The outdoor unit then displays "UP" (Un Prepared).ఐ Display :After Auto Trial Operation, the outdoor unit repeatedly displays the addresses of the connected devices. (See Chapter 8.)(6) Record installation details in the installation check card attached on the front of the control box.(7) Be sure to close the frontal cabinet on the outdoor unit before starting operation.Operation with the frontal cabinet opened may damage the system and degrade the inspection accuracy.3) What is checked during Auto Trial Operation- Outdoor unit’s thermistors (EVA In/Out and indoor thermistors on each indoor unit)- Outdoor unit’s thermistors (Cond_Out, EVI In/Out, Suction, liquid line thermistors and outdoor (or water temp) thermistorson each outdoor unit)- Outdoor unit’s high pressure and low pressure sensors- Whether the outdoor unit’s ball valve (service valve) is opened or closed is checked- Operation electric current on the outdoor unit’s compressor is checked- Outdoor unit’s CYCLE status is checked- Outdoor unit’s 4-way valve operation related to outdoor air is checked- Outdoor unit’s EVI EEV operation is checked- Outdoor unit’s Main EEV operation is checked( ఐ Checked only if “heating” mode is on during Auto Trial Operation)9. Test Operation
