6-36* It is not necessary to disconnect the communications line in the inter-unit control wiring if it has already been con-nected at this time.* Setting modes 1 and 2 can be used even when the outdoor unit is independent (when 1 maintenance remote con-troller is connected to 1 outdoor unit and automatic address setting for the indoor units has not been completed).* Displays the overall system status for that refrigerant system.z All units start/stop (Fig. 6-1)The button can be used to start and stop all the indoor units.• The LED turns ON when 1 or more indoor units is operating.• The LED blinks when an alarm has occurred at 1 or more indoor unitsduring operation.z Switching between cooling/heating (Fig. 6-1)The button switches between heating and cooling modes.• The specifications are equivalent to the heating/cooling input that waspresent on earlier outdoor unit PCBs.• The display shows the operating mode of the indoor unit with the lowestnumber.z All units test run (Fig. 6-2)The button switches test run ON/OFF for all indoor units.• Press and hold for 4 seconds to turn ON.“Test run” is displayed while the test run is in progress.• Conditions of test runs that are started from the unit remote controller arenot displayed on the outdoor unit maintenance remote controller.6-3. Normal Display Operations and FunctionsNormal display functions• Connect the special service checker wiring to the outdoor unit PCB.The connection is shown in the figure below.Special service checker wiringRelay connector (2P, white)Interface for outdoor unit maintenanceremote controller (Optional, Servicing No.CV6233039848)PCB connector (3P, blue)PCB connector (5P, red)RC (5P, red)Outdoor unitcontrol PCBRemote controller AssyFig. 6-2Fig. 6-1
