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TECHNICAL & SERVICE MANUAL
CS-KS12NB41 & CZ-18BT1U + CU-KS12NK1A
CS-KS18NB4UW & CZ-18BT1U + CU-KS18NKU
CS-KS18NB4UW & CZ-18BT1U + CU-KS18NKUA
DC INVERTER SPLIT SYSTEM AIR CONDITIONER
Indoor Model No. Product Code No. Outdoor Model No. Product Code No.
Body (Panel) Body (Panel) CU-KS18NKU 1 852 361 18
CS-KS12NB41 (CZ-18BT1U) 1 852 361 04 (1 852 361 15) CU-KS12NK1A 1 852 361 16
CS-KS18NB4UW (CZ-18BT1U) 1 852 361 06 (1 852 361 15) CU-KS18NKUA 1 852 361 19
Indoor Unit Outdoor Unit
Body
Panel
CS-KS12
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SAFETY PRECAUTIONS • Before doing repair work, please read the " SAFETY PRECAUTIONS" carefully and fully understand them. • The precautionary items here are divided into " Warning" and " Caution" items. Items in particular which may cause death or serious injury to the service personnel if the work is not performed correctly, are included in the " Warning" table. However, even precautionary items identified as " Caution" also have the potential for serious consequences if
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Warning If refrigerant gas blows off during the work, do not touch the refrigerant gas as it may cause frostbite. Prohibit If refrigerant gas leaks during the work, ventilate the room. If refrigerant gas catches fire, harmful gas may be generated. Do not mix any gas other than the specified refrigerant gas in the refrigerating cycle. If air or other contaminants mix with the gas, pressure will become extremely high in the refrigerating cycle, which may cause a unit breakdown." Prohibit When th
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Table of Contents Page SAFETY PRECAUTIONS .............................................................................................................. 2 TABLE OF CONTENTS ..................................................................................................................... 4 1. OPERATING RANGE ................................................................................................................... 6 2. SPECIFICATIONS 2-1. Unit Specifications ...................
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Page 10. CHECKING ELECTRICAL COMPONENTS 10-1. Measurement of Insulation Resistance ............................................................................... 60 10-2. Checking Continuity of Fuse on PCB Ass'y ......................................................................... 61 11. REFRIGERANT R410A: SPECIAL PRECAUTIONS WHEN SERVICING UNIT 11-1. Characteristics of New Refrigerant R410A ......................................................................... 62 11-2. Checklist before
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1. OPERATING RANGE Models : CS-KS18NB4UW & CZ-18BT1U + CU-KS18NKU Temperature Indoor Air Intake Temp. Outdoor Air Intake Temp. Maximum 95 °F DB / 71 °F WB 115 °F DB Cooling Minimum 67 °F DB / 57 °F WB 67 °F DB Models : CS-KS12NB41 & CZ-18BT1U + CU-KS12NK1A CS-KS18NB4UW & CZ-18BT1U + CU-KS18NKUA Temperature Indoor Air Intake Temp. Outdoor Air Intake Temp. Maximum 95 °F DB / 71 °F WB 115 °F DB Cooling Minimum 67 °F DB / 57 °F WB 0 °F DB 6
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2. SPECIFICATIONS 2-1. Unit Specifications 2-1-1. Indoor Unit CS-KS18NB4UW & CZ-18BT1U Outdoor Unit CU-KS18NKU < 230V > Voltage Rating 230V Single-Phase 60Hz Cooling Total Capacity BTU/h 17,500 ( 4,000 to 17,500 ) kW 5.15 ( 1.2 to 5.15 ) Sensible Capacity BTU/h 10,600 Latent Capacity BTU/h 6,900 3 3 Air Circulation (Hi/Me/Lo) ft /min (m /h) 341 (579) / 294 (500) / 253 (430) Moisture Removal (High) Pints/h 4.89 Available Voltage Range V 187 to 253 Running Amperes A 8.3 ( 1.2 to 8.3 ) Power Inp
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Indoor Unit CS-KS18NB4UW & CZ-18BT1U Outdoor Unit CU-KS18NKU < 230V > Individual Unit Indoor Unit Dimensions & Weight (Indoor Unit) Body Panel (CS-KS18NB4UW & CZ-18BT1U) (CS-KS18NB4UW) (CZ-18BT1U) Unit Dimensions Height inch (mm) 12-5/16 (313) 11-5/32 (283) 1-9/16 (40) Width inch (mm) 24-19/32 (625) 22-5/8 (575) 24-19/32 (625) Depth inch (mm) 24-19/32 (625) 22-5/8 (575) 24-19/32 (625) Package Dimensions Height inch (mm) - 11-13/32 (290) 4-1/8 (105) Width inch (mm) - 24-13/16 (630) 26-3/16 (665)
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2-1-2. Indoor Unit CS-KS18NB4UW & CZ-18BT1U Outdoor Unit CU-KS18NKU < 208V > Voltage Rating 208V Single-Phase 60Hz Cooling Total Capacity BTU/h 17,500 ( 4,000 to 17,500 ) kW 5.15 ( 1.2 to 5.15 ) Sensible Capacity BTU/h 10,600 Latent Capacity BTU/h 6,900 3 3 Air Circulation (Hi/Me/Lo) ft /min (m /h) 341 (579) / 294 (500) / 253 (430) Moisture Removal (High) Pints/h 4.89 Available Voltage Range V 187 to 253 Running Amperes A 9.1 ( 1.2 to 9.1 ) Power Input W 1,860 ( 250 to 1,860 ) Power Factor % 98
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Indoor Unit CS-KS18NB4UW & CZ-18BT1U Outdoor Unit CU-KS18NKU < 208V > Individual Unit Indoor Unit Dimensions & Weight (Indoor Unit) Body Panel (CS-KS18NB4UW & CZ-18BT1U) (CS-KS18NB4UW) (CZ-18BT1U) Unit Dimensions Height inch (mm) 12-5/16 (313) 11-5/32 (283) 1-9/16 (40) Width inch (mm) 24-19/32 (625) 22-5/8 (575) 24-19/32 (625) Depth inch (mm) 24-19/32 (625) 22-5/8 (575) 24-19/32 (625) Package Dimensions Height inch (mm) - 11-13/32 (290) 4-1/8 (105) Width inch (mm) - 24-13/16 (630) 26-3/16 (665)
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2-1-3. Indoor Unit CS-KS12NB41 & CZ-18BT1U Outdoor Unit CU-KS12NK1A Voltage Rating 115V Single-Phase 60Hz Cooling Total Capacity BTU/h 11,900 ( 3,000 to 11,900 ) kW 3.5 ( 0.9 to 3.5 ) Sensible Capacity BTU/h 7,200 Latent Capacity BTU/h 4,700 3 3 Air Circulation (Hi/Me/Lo) ft /min (m /h) 235 (399) / 206 (350) / 194 (330) Moisture Removal (High) Pints/h 4.26 Available Voltage Range V 104 to 126 Running Amperes A 12.6 ( 2.5 to 12.6 ) Power Input W 1,260 ( 250 to 1,260 ) Power Factor % 87 EER BTU/h
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Indoor Unit CS-KS12NB41 & CZ-18BT1U Outdoor Unit CU-KS12NK1A Individual Unit Indoor Unit Dimensions & Weight (Indoor Unit) Body Panel (CS-KS12NB41 & CZ-18BT1U) (CS-KS12NB41) (CZ-18BT1U) Unit Dimensions Height inch (mm) 12-5/16 (313) 11-5/32 (283) 1-9/16 (40) Width inch (mm) 24-19/32 (625) 22-5/8 (575) 24-19/32 (625) Depth inch (mm) 24-19/32 (625) 22-5/8 (575) 24-19/32 (625) Package Dimensions Height inch (mm) - 11-13/32 (290) 4-1/8 (105) Width inch (mm) - 24-13/16 (630) 26-3/16 (665) Depth inch
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2-1-4. Indoor Unit CS-KS18NB4UW & CZ-18BT1U Outdoor Unit CU-KS18NKUA < 230V > Voltage Rating 230V Single-Phase 60Hz Cooling Total Capacity BTU/h 17,500 ( 4,000 to 17,500 ) kW 5.15 ( 1.2 to 5.15 ) Sensible Capacity BTU/h 10,600 Latent Capacity BTU/h 6,900 3 3 Air Circulation (Hi/Me/Lo) ft /min (m /h) 341 (579) / 294 (500) / 253 (430) Moisture Removal (High) Pints/h 4.89 Available Voltage Range V 187 to 253 Running Amperes A 8.3 ( 1.2 to 8.3 ) Power Input W 1,860 ( 250 to 1,860 ) Power Factor % 9
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Indoor Unit CS-KS18NB4UW & CZ-18BT1U Outdoor Unit CU-KS18NKUA < 230V > Individual Unit Indoor Unit Dimensions & Weight (Indoor Unit) Body Panel (CS-KS18NB4UW & CZ-18BT1U) (CS-KS18NB4UW) (CZ-18BT1U) Unit Dimensions Height inch (mm) 12-5/16 (313) 11-5/32 (283) 1-9/16 (40) Width inch (mm) 24-19/32 (625) 22-5/8 (575) 24-19/32 (625) Depth inch (mm) 24-19/32 (625) 22-5/8 (575) 24-19/32 (625) Package Dimensions Height inch (mm) - 11-13/32 (290) 4-1/8 (105) Width inch (mm) - 24-13/16 (630) 26-3/16 (665)
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2-1-5. Indoor Unit CS-KS18NB4UW & CZ-18BT1U Outdoor Unit CU-KS18NKUA < 208V > Voltage Rating 208V Single-Phase 60Hz Cooling Total Capacity BTU/h 17,500 ( 4,000 to 17,500 ) kW 5.15 ( 1.2 to 5.15 ) Sensible Capacity BTU/h 10,600 Latent Capacity BTU/h 6,900 3 3 Air Circulation (Hi/Me/Lo) ft /min (m /h) 341 (579) / 294 (500) / 253 (430) Moisture Removal (High) Pints/h 4.89 Available Voltage Range V 187 to 253 Running Amperes A 9.1 ( 1.2 to 9.1 ) Power Input W 1,860 ( 250 to 1,860 ) Power Factor % 9
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Indoor Unit CS-KS18NB4UW & CZ-18BT1U Outdoor Unit CU-KS18NKUA < 208V > Individual Unit Indoor Unit Dimensions & Weight (Indoor Unit) Body Panel (CS-KS18NB4UW & CZ-18BT1U) (CS-KS18NB4UW) (CZ-18BT1U) Unit Dimensions Height inch (mm) 12-5/16 (313) 11-5/32 (283) 1-9/16 (40) Width inch (mm) 24-19/32 (625) 22-5/8 (575) 24-19/32 (625) Depth inch (mm) 24-19/32 (625) 22-5/8 (575) 24-19/32 (625) Package Dimensions Height inch (mm) - 11-13/32 (290) 4-1/8 (105) Width inch (mm) - 24-13/16 (630) 26-3/16 (665)
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2-2. Major Component Specifications 2-2-1. Indoor Unit Indoor Unit (Body) CS-KS12NB41 Control PCB Part No. CB-CS-KS12NB4U Controls Microprocessor Control Circuit Fuse 250V 3A Fan Type Turbo Q'ty ... Dia. and Length inch (mm) 1 ... D12-5/8 / L5-3/4 (D322/L147) Fan Motor Type DC Motor Model ... Q'ty SIC-62FW-D866-2 ... 1 No. of Poles 8 Rough Measure RPM (Cool) 470 Rating Voltage / Nominal Output DC160V / 23W Coil Resistance Ohm - (Ambient Temp. 68 °F (20 °C)) Safety Device Type Internal Contro
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Indoor Unit (Body) CS-KS18NB4UW Control PCB Part No. CB-CS-KS18NB4U Controls Microprocessor Control Circuit Fuse 250V 3A Fan Type Turbo Q'ty ... Dia. and Length inch (mm) 1 ... D12-5/8 / L5-3/4 (D322/L147) Fan Motor Type DC Motor Model ... Q'ty SIC-62FW-D866-2 ... 1 No. of Poles 8 Rough Measure RPM (Cool) 650 Rating Voltage / Nominal Output DC340V / 20W Coil Resistance Ohm - (Ambient Temp. 68 °F (20 °C)) Safety Device Type Internal Controller Over- Current Protection Yes Over- Heat Protection
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2-2-2. Outdoor Unit Outdoor Unit CU-KS18NKU Control PCB Part No. CB-CU-KS18NKU Controls Microprocessor Control Circuit Fuse 250V 25A Compressor Type DC Twin Rotary (Hermetic) Compressor Model / Nominal Output C-6RVN93H0M / 1,050W Compressor Oil ... Amount Pints (cc) FV50S ... 0.74 (350) Coil Resistance (Ambient Temp. 68 °F (20 °C)) Ohm R - S : 0.482 S - T : 0.482 T - R : 0.482 Safety Device CT (Peak current cut-off control) Yes Compressor Discharge Temp. Control Yes Operation cut-off cont
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Outdoor Unit CU-KS12NK1A Control PCB Part No. CB-CU-KS12NK1A Controls Microprocessor Control Circuit Fuse 125V 25A Compressor Type DC Rotary (Hermetic) Compressor Model / Nominal Output G4C090LU1ER / 900W Compressor Oil ... Amount Pints (cc) FV50S ... 0.68 (320) Coil Resistance (Ambient Temp. 68 °F (20 °C)) Ohm U - V : 0.81 V - W : 0.81 W - U : 0.81 Safety Device CT (Peak current cut-off control) Yes Compressor Discharge Temp. Control Yes Operation cut-off control in abnormal ambient Temp.
