2 Specifications, designs and contents in this Service Manual are subject to change without notice.TABLE OF CONTENTS PAGE PAGE1. Safety Precautions .............................................32. Precaution for Using R32 Refrigerant ..............63. Specifications ...................................................114. Features .............................................................295. Location of Controls and Components ..........305.1 Indoor Unit ..................................................305.2 Outdoor Unit ...............................................305.3 Remote Control ..........................................306. Dimensions .......................................................316.1 Indoor Unit & Remote Control ....................316.2 Outdoor Unit ...............................................337. Refrigeration Cycle Diagram ...........................358. Block Diagram ..................................................368.1 CS-DZ25VKE CU-DZ25VKECS-DZ35VKE CU-DZ35VKECS-PZ25VKE CU-PZ25VKECS-PZ35VKE CU-PZ35VKECS-UZ25VKE CU-UZ25VKECS-UZ35VKE CU-UZ35VKE .....................368.2 CS-DZ50VKE CU-DZ50VKECS-PZ50VKE CU-PZ50VKECS-UZ50VKE CU-UZ50VKE .....................379. Wiring Connection Diagram ............................389.1 Indoor Unit ..................................................389.2 Outdoor Unit ...............................................4010. Electronic Circuit Diagram ..............................4210.1 Indoor Unit ..................................................4210.2 Outdoor Unit ...............................................4411. Printed Circuit Board .......................................4611.1 Indoor Unit ..................................................4611.2 Outdoor Unit ...............................................4912. Installation Instruction .....................................5112.1 Select the Best Location .............................5112.2 Indoor Unit ..................................................5212.3 Outdoor Unit ...............................................5713. Installation and Servicing Air Conditionerusing R32 ..........................................................6213.1 About R32 Refrigerant ................................6213.2 Characteristics of R32 Refrigerant .............6213.3 Refrigerant piping installation • Tools usedin services ...................................................6413.4 New installation, Relocation,Repairing of Refrigerant Cycle SystemThe Procedures ..........................................6813.5 Piping installation of R32 ............................6913.6 Installation, Relocation, and Service ..........7013.7 Repairing of refrigerant cycle /Brazing point...............................................7413.8 Analysis method for no errorcode, no cooling / no warming ....................8014. Operation Control .............................................8214.1 Basic Function ............................................8214.2 Indoor Fan Motor Operation .......................8314.3 Outdoor Fan Motor Operation ....................8414.4 Airflow Direction..........................................8414.5 Timer Control ..............................................8614.6 Sleep Mode Operation ...............................8714.7 Random Auto Restart Control ....................8814.8 Indication Panel ..........................................8814.9 Quiet Operation (Cooling Mode/CoolingArea of Dry Mode) ......................................8814.10 Quiet Operation (Heating) ..........................8914.11 Powerful Mode Operation ...........................8915. Protection Control ............................................9015.1 Protection Control for All Operations ..........9015.2 Protection Control for Cooling & Soft DryOperation ....................................................9215.3 Protection Control for Heating Operation ...9316. Servicing Mode .................................................9516.1 Auto OFF/ON Button ..................................9516.2 Heat Only Operation ...................................9616.3 Remote Control Button ...............................9717. Troubleshooting Guide ................................. 10017.1 Refrigeration Cycle System ..................... 10017.2 Relationship Between the Condition of theAir Conditioner and Pressure and ElectricCurrent ..................................................... 10117.3 Breakdown Self Diagnosis Function........ 10217.4 Error Codes Table ................................... 10317.5 Self-diagnosis Method ............................. 10518. Disassembly and Assembly Instructions ... 13318.1 CS-DZ25VKE CS-DZ35VKECS-PZ25VKE CS-PZ35VKECS-UZ25VKE CS-UZ35VKE .................. 13318.2 CS-DZ50VKE CS-PZ50VKECS-UZ50VKE .......................................... 13818.3 Outdoor Electronic Controller RemovalProcedure ................................................ 14319. Technical Data ............................................... 14519.1 Cool Mode Performance Data ................. 14519.2 Heat Mode Performance Data................. 14720. Service Data ................................................... 14920.1 Cool Mode Outdoor Air TemperatureCharacteristic ........................................... 14920.2 Heat Mode Outdoor Air TemperatureCharacteristic ........................................... 15520.3 Piping Length Correction Factor.............. 16121. Exploded View and Replacement PartsList .................................................................. 16321.1 Indoor Unit ............................................... 16321.2 Outdoor Unit ............................................ 169