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TECHNICAL & SERVICE MANUAL
CS-KS18NKU + CU-KS18NKU
+ CU-KS18NKUA
CS-KS24NKU + CU-KS24NKU
+ CU-KS24NKUA
DC INVERTER SPLIT SYSTEM AIR CONDITIONER
Indoor Model No. Product Code No. Outdoor Model No. Product Code No.
CS-KS18NKU 1 852 360 90 CU-KS18NKU 1 852 361 18
CS-KS24NKU 1 852 360 91 CU-KS18NKUA 1 852 361 19
CU-KS24NKU 1 852 361 21
CU-KS24NKUA 1 852 361 22
Indoor Unit Outdoor Unit
CS-KS18NKU
CS-KS24NKU
CU-KS18NKU
CU-KS18NKUA
IMPORTANT
These air conditioners employ new
refrigerant R410A.
Pay spec
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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 1. OPERATING RANGE ................................................................................................................... 6 2. SPECIFICATIONS 2-1. Unit Specifications ............................................................................................................. 7 2-2. Major Component Specifications ....................................................................................... 15 2-3. Other Component Specifications ..................
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Page 11. REFRIGERANT R410A: SPECIAL PRECAUTIONS WHEN SERVICING UNIT 11-1. Characteristics of New Refrigerant R410A ......................................................................... 59 11-2. Checklist before Servicing ................................................................................................... 60 11-3. Tools Specifically for R410A ................................................................................................ 61 11-4. Tubing Installation Procedures
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1. OPERATING RANGE Models: CS-KS18NKU + CU-KS18NKU CS-KS24NKU + CU-KS24NKU 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-KS18NKU + CU-KS18NKUA CS-KS24NKU + CU-KS24NKUA 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 Indoor Unit CS-KS18NKU 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 13,100 BTU/h Latent Capacity BTU/h 4,400 3 3 Air Circulation (Hi/Me/Lo) ft /min (m /h) 524 (890) / 441 (749) / 377 (641) Moisture Removal (High) Pints/h 4.89 Available Voltage Range V 187 to 253 Running Amperes A 7.0 ( 1.2 to 7.0 ) Power Input W 1,500 ( 250 to 1
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Indoor Unit CS-KS18NKU 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 13,100 BTU/h Latent Capacity BTU/h 4,400 3 3 Air Circulation (Hi/Me/Lo) ft /min (m /h) 524 (890) / 441 (749) / 377 (641) Moisture Removal (High) Pints/h 4.89 Available Voltage Range V 187 to 253 Running Amperes A 7.7 ( 1.2 to 7.7 ) Power Input W 1,500 ( 250 to 1,500 ) Power Factor % 94 EER BTU/h/W 11.7 SEE
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Indoor Unit CS-KS24NKU Outdoor Unit CU-KS24NKU < 230V > Voltage Rating 230V Single-Phase 60Hz Cooling Total Capacity BTU/h 24,200 ( 4,000 to 24,200 ) kW 7.1 ( 1.2 to 7.1 ) Sensible Capacity 14,800 BTU/h Latent Capacity BTU/h 9,400 3 3 Air Circulation (Hi/Me/Lo) ft /min (m /h) 659 (1,120) / 571 (970) / 494 (839) Moisture Removal (High) Pints/h 4.89 Available Voltage Range V 187 to 253 Running Amperes A 10.8 ( 1.3 to 10.8 ) Power Input W 2,460 ( 280 to 2,460 ) Power Factor % 99 EER BTU/h/W 9.8 SE
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Indoor Unit CS-KS24NKU Outdoor Unit CU-KS24NKU < 208V > Voltage Rating 208V Single-Phase 60Hz Cooling Total Capacity BTU/h 24,200 ( 4,000 to 24,200 ) kW 7.1 ( 1.2 to 7.1 ) Sensible Capacity 14,800 BTU/h Latent Capacity BTU/h 9,400 3 3 Air Circulation (Hi/Me/Lo) ft /min (m /h) 659 (1,120) / 571 (970) / 494 (839) Moisture Removal (High) Pints/h 4.89 Available Voltage Range V 187 to 253 Running Amperes A 12.1( 1.3 to 12.1 ) Power Input W 2,460 ( 280 to 2,460 ) Power Factor % 98 EER BTU/h/W 9.8 SEE
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Indoor Unit CS-KS18NKU 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 13,100 BTU/h Latent Capacity BTU/h 4,400 3 3 Air Circulation (Hi/Me/Lo) ft /min (m /h) 524 (890) / 441 (749) / 377 (641) Moisture Removal (High) Pints/h 4.89 Available Voltage Range V 187 to 253 Running Amperes A 7.0 ( 1.2 to 7.0 ) Power Input W 1,500 ( 250 to 1,500 ) Power Factor % 93 EER BTU/h/W 11.7 SE
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Indoor Unit CS-KS18NKU 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 13,100 BTU/h Latent Capacity BTU/h 4,400 3 3 Air Circulation (Hi/Me/Lo) ft /min (m /h) 524 (890) / 441 (749) / 377 (641) Moisture Removal (High) Pints/h 4.89 Available Voltage Range V 187 to 253 Running Amperes A 7.7 ( 1.2 to 7.7 ) Power Input W 1,500 ( 250 to 1,500 ) Power Factor % 94 EER BTU/h/W 11.7 SE
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Indoor Unit CS-KS24NKU Outdoor Unit CU-KS24NKUA < 230V > Voltage Rating 230V Single-Phase 60Hz Cooling Total Capacity BTU/h 24,200 ( 4,000 to 24,200 ) kW 7.1 ( 1.2 to 7.1 ) Sensible Capacity 14,800 BTU/h Latent Capacity BTU/h 9,400 3 3 Air Circulation (Hi/Me/Lo) ft /min (m /h) 659 (1,120) / 571 (970) / 494 (839) Moisture Removal (High) Pints/h 4.89 Available Voltage Range V 187 to 253 Running Amperes A 10.8 ( 1.3 to 10.8 ) Power Input W 2,460 ( 280 to 2,460 ) Power Factor % 99 EER BTU/h/W 9.8 S
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Indoor Unit CS-KS24NKU Outdoor Unit CU-KS24NKUA < 208V > Voltage Rating 208V Single-Phase 60Hz Cooling Total Capacity BTU/h 24,200 ( 4,000 to 24,200 ) kW 7.1 ( 1.2 to 7.1 ) Sensible Capacity 14,800 BTU/h Latent Capacity BTU/h 9,400 3 3 Air Circulation (Hi/Me/Lo) ft /min (m /h) 659 (1,120) / 571 (970) / 494 (839) Moisture Removal (High) Pints/h 4.89 Available Voltage Range V 187 to 253 Running Amperes A 12.1( 1.3 to 12.1 ) Power Input W 2,460 ( 280 to 2,460 ) Power Factor % 98 EER BTU/h/W 9.8 SE
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2-2. Major Component Specifications 2-2-1. Indoor Unit Indoor Unit CS-KS18NKU Control PCB Part No. CB-CS-KS18NKU Controls Microprocessor Control Circuit Fuse 250V 3A Fan Type Cross-Flow Q'ty ... Dia. and Length inch (mm) 1 ... D3-5/8 / L33-9/32 (D92/L845) Fan Motor Type DC Motor Model ... Q'ty SIC-41CVJ-D847-3 ... 1 No. of Poles 8 Rough Measure RPM (Cool) 1,250 Nominal Output W 30 Coil Resistance Ohm - (Ambient Temp. 68 °F (20 °C)) Safety Device Type Internal Controller Over-Current Protecti
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Indoor Unit CS-KS24NKU Control PCB Part No. CB-CS-KS24NKU Controls Microprocessor Control Circuit Fuse 250V 3A Fan Type Cross-Flow Q'ty ... Dia. and Length inch (mm) 1 ... D3-5/8 / L33-9/32 (D92/L845) Fan Motor Type DC Motor Model ... Q'ty SIC-41CVJ-D847-3 ... 1 No. of Poles 8 Rough Measure RPM (Cool) 1,500 Nominal Output W 30 Coil Resistance Ohm - (Ambient Temp. 68 °F (20 °C)) Safety Device Type Internal Controller Over-Current Protection Yes Over-Heat Protection Yes Run Capacitor Micro F -
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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 U - V : 0.482 V - W : 0.482 W - U : 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-KS24NKU Control PCB Part No. CB-CU-KS24NKU Controls Microprocessor Control Circuit Fuse 250V 25A Compressor Type DC Twin Rotary (Hermetic) Compressor Model / Nominal Output G8T265FU1JW / 2,410W Compressor Oil ... Amount Pints (cc) FV50S ... 1.49 (700) Coil Resistance (Ambient Temp. 77 °F (25 °C)) Ohm U - V : 0.36 V - W : 0.36 W - U : 0.36 Safety Device CT (Peak current cut-off control) Yes Compressor Discharge Temp. Control Yes Operation cut-off control in abnormal ambient
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Outdoor Unit CU-KS18NKUA Control PCB Part No. CB-CU-KS18NKUA 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 control in abnormal amb
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Outdoor Unit CU-KS24NKUA Control PCB Part No. CB-CU-KS24NKUA Controls Microprocessor Control Circuit Fuse 250V 25A Compressor Type DC Twin Rotary (Hermetic) Compressor Model / Nominal Output G8T265FU1JW / 2,410W Compressor Oil ... Amount Pints (cc) FV50S ... 1.49 (700) Coil Resistance (Ambient Temp. 77 °F (25 °C)) Ohm U - V : 0.36 V - W : 0.36 W - U : 0.36 Safety Device CT (Peak current cut-off control) Yes Compressor Discharge Temp. Control Yes Operation cut-off control in abnormal ambien
