Samsung AC0 JNHDCH/AA Series Technical Bulletin

TECHNICAL BULLETIN:www.SamsungHVAC.comQS-CAC-062016ASamsung CAC Systems (AC0***N**CH/AA)Cool Mode Fan Operation ReductionReduced fan option setting (cooling mode) operation optionPage 1 of 49. Once the numbers shown above are entered into the controller, press the power button several times while pointing remote at theindoor unit.- Samsung CAC single zone systems (AC0**JNHDCH/AA, AC0**JN4DCH/AA, AC0**KNLDCH/AA) have an option to turn the fanoff once set temperature has been reached in Thermo OFF)while in cooling mode.- This option should only be enabled when sensing room temperature externally via wired controller or external temperature sensor(MRW-TA).- Enabling this option requires adjusting the 24 segment factory option code. The technician must add 8 to the current value ofsegment 23 of factory option code (0→8, 1→9, 2→A, 3→B, 4→C, 5 →D, 6→E, 7→F).- Example: the factory option code for AC018FN4DCH/AA 4-way cassette is 0140EF-1950D8-27343B-370005. To enable the reducedfan operation option, the new option code will be 0140EF-1950D8-27343B-370085.- Factory option codes are different for each indoor unit model number (model specific). This 24 segment code can be adjustedwith a wired controller, wireless controller, or with SNET Pro 2 service software.Changing segment 23 with a wireless controllerWhen only enabling this feature (not entering the entire 24 segment code) on an indoor unit that has a wireless IR receiver, thesingle option setting feature can be used. Below are the steps required to only change segment 23 with a wireless controller whensegment 23 is "0" from the factory and is being changed to "8". At this time all current CAC indoor units will require segment 23 to be"8" to enable this feature (full option codes can be found on pages 3 and 4 of this document).1. To enter service mode, remove the batteries and wait for the screen to go blank. While holding the temperature up and down buttons,replace the batteries.2. Press the FAN DOWN button to adjust the segment on the left. Press FAN DOWN until the first segment on the screen is "d".3. Press the FAN UP button to adjust the segment on the right. Press FAN UP once to make the left segment "1".4. Press MODE to advance to the next page (noted by "Auto", "Cool", and "Dry").5. Press the FAN DOWN button to adjust the segment on the left. Press FAN DOWN until the first segment on the screen is "2".6. Press the FAN UP button to adjust the segment on the right. Press FAN UP to make the left segment "3".7. Press MODE to advance to the next page (noted by "Auto", "Cool", and "Dry").8. Press the FAN DOWN button to adjust the segment onthe left. Press FAN DOWN until the first segment on the screen is "8".10. Remove the batteries form the controller. After the controller display goes blank, replace the batteries and cover for normaloperation.Setting segment 23 of the indoor unit option code to "8""Page" 2"Page" 1 "Page" 3Press PressPress the FAN DOWN button to adjust the segment on the left. Press FAN DOWN until the first segment on the screen is "8".8.

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