4 Before operationUser reference guide4FNA25~60A2VEB(9)Split system air conditioners4P543324-3 – 2018.08abcfdea Indoor unitb Outdoor unitc User interfaced Refrigerant piping and electric wiringe Drain pipef Earth wire to ground outdoor unit to prevent electricshocks.CAUTIONDo NOT insert fingers, rods or other objects into the airinlet or outlet. Do NOT remove the fan guard. When thefan is rotating at high speed, it will cause injury.CAUTION▪ NEVER touch the internal parts of the controller.▪ Do NOT remove the front panel. Some parts inside aredangerous to touch and appliance problems mayhappen. For checking and adjusting the internal parts,contact your dealer.NOTICEDo NOT wipe the controller operation panel with benzine,thinner, chemical dust cloth, etc. The panel may getdiscoloured or the coating peeled off. If it is heavily dirty,soak a cloth in water-diluted neutral detergent, squeeze itwell and wipe the panel clean. Wipe it with another drycloth.NOTICENEVER press the button of the user interface with a hard,pointed object. The user interface may be damaged.NOTICENEVER pull or twist the electric wire of the user interface. Itmay cause the unit to malfunction.3.2 Combining units and options3.2.1 Possible options for the indoor unitMake sure you have the following mandatory options:▪ User interface: Wired or wirelessSelect a user interface in accordance with the customer's request.Refer to the table below to select a suitable user interface.User interfaceWired user interface BRC1D52/BRC1D61/BRC1E51A/BRC1E53A7/BRC1E53B7/BRC1E53C7/BRC1H519Wireless user interface BRC4C653.3 User interfaceCAUTION▪ NEVER touch the internal parts of the controller.▪ Do NOT remove the front panel. Some parts inside aredangerous to touch and appliance problems mayhappen. For checking and adjusting the internal parts,contact your dealer.This operation manual will give a non-exhaustive overview of themain functions of the system.For more information about the user interface, see the operationmanual of the installed user interface.3.4 Information related to units usingR32 refrigerantWARNINGNever use a flammable spray such as hair spray, lacqueror paint near the unit. It may cause a fire, or, in case ofR32 refrigerant, misdetection by the refrigerant leakagesensor.1CAUTIONDo NOT turn off the breaker, unless you smell somethingburning, or during a short repair period, inspection, orcleaning of the unit. Otherwise, refrigerant leakageCANNOT be detected.1CAUTIONDo NOT install or use in highly airtight spaces, e.g.soundproof chambers or rooms with sealed doors.1CAUTIONThis unit is equipped with electrically powered safetymeasures, such as a refrigerant leak detector. In order tobe effective, the unit must be electrically powered at alltimes after installation, except for short service periods.1CAUTIONDo NOT install or use in places filled with smoke, gas,chemicals etc. Sensors inside the indoor unit may detectthese substances, and display a refrigerant leakabnormality.14 Before operationWARNINGAsk your dealer for improvement, repair, and maintenance.Incomplete improvement, repair, and maintenance mayresult in water leakage, electric shock and fire.WARNINGAsk your dealer to move and reinstall the air conditioner.Incomplete installation may result in a water leakage,electric shock, and fire.(1) Only for units using R32 refrigerant. Refer to the outdoor unit specifications for the type of refrigerant to be used.