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TECHNICAL & SERVICE MANUAL
INDOOR UNIT : CS-MKS9NB4U & CZ-18BT1U
CS-MKS12NB4U & CZ-18BT1U
CS-KS18NB4UW & CZ-18BT1U
DC INVERTER MULTI-SYSTEM AIR CONDITIONER
Indoor Model No. Product Code No.
Capacity
Body (Panel) Body (Panel)
9,000BTU / h CS-MKS9NB4U (CZ-18BT1U) 1 852 361 08 (1 852 361 15)
11,900BTU / h CS-MKS12NB4U (CZ-18BT1U) 1 852 361 09 (1 852 361 15)
17,500BTU / h CS-KS18NB4UW (CZ-18BT1U) 1 852 361 06 (1 852 361 15)
Semi-Concealed Type Indoor Unit
Body
< Applicable Multi-Outdoor Units
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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 .............................................................................................................. 2 SAFETY PRECAUTIONS ................................................................................................................... 4 TABLE OF CONTENTS .................................................................................... 6 APPLICABLE MULTI-OUTDOOR UNITS ...................................................................................
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Page ............................................................................................ A-4 APPENDIX D Operating Instructions (CZ-RD515U) ............................................................................ A-5 APPENDIX E INSTALLATION INSTRUCTIONS (CZ-RD515U) 5
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APPLICABLE MULTI-OUTDOOR UNITS Multi-Outdoor Unit 3-Room 4-Room 4-Room CU-3KS19NBU CU-4KS24NBU CU-4KS31NBU Indoor Unit CS-MKS9NB4U & CZ-18BT1U YES YES YES CS-MKS12NB4U & CZ-18BT1U YES YES YES CS-KS18NB4UW & CZ-18BT1U YES YES YES 6
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1. OPERATING RANGE 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 14 °F DB 7
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2. SPECIFICATIONS 2-1. Unit Specifications 2-1-1. Indoor Unit CS-MKS9NB4U & CZ-18BT1U <230V> Type Semi-Concealed Type Indoor Unit Voltage Rating 230V Single-Phase 60Hz Cooling Total Capacity BTU/h 9,000 kW 2.65 3 3 Air Circulation (Hi/Me/Lo) ft /min (m /h) 221(376)/206(350)/194(330) Moisture Removal (High) Pints/h 3.4 Available Voltage Range V 187 to 253 Running Amperes A 0.1 Power Input W 16 -- Controls / Temperature Control Microprocessor / I.C. Thermister Control Unit Wireless Remote Contr
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Indoor Unit CS-MKS9NB4U & CZ-18BT1U <208V> Type Semi-Concealed Type Indoor Unit Voltage Rating 208V Single-Phase 60Hz Cooling Total Capacity BTU/h 9,000 kW 2.65 3 3 Air Circulation (Hi/Me/Lo) ft /min (m /h) 221(376)/206(350)/194(330) Moisture Removal (High) Pints/h 3.4 Available Voltage Range V 187 to 253 Running Amperes A 0.11 Power Input W 15 -- Controls / Temperature Control Microprocessor / I.C. Thermister Control Unit Wireless Remote Control Unit Timer 24-Hour ON or OFF Timer, 1-Hour OFF
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Indoor Unit CS-MKS12NB4U & CZ-18BT1U <230V> Type Semi-Concealed Type Indoor Unit Voltage Rating 230V Single-Phase 60Hz Cooling Total Capacity BTU/h 11,900 kW 3.5 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 187 to 253 Running Amperes A 0.11 Power Input W 17 -- Controls / Temperature Control Microprocessor / I.C. Thermister Control Unit Wireless Remote Control Unit Timer 24-Hour ON or OFF Timer, 1-Hour O
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Indoor Unit CS-MKS12NB4U & CZ-18BT1U <208V> Type Semi-Concealed Type Indoor Unit Voltage Rating 208V Single-Phase 60Hz Cooling Total Capacity BTU/h 11,900 kW 3.5 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 187 to 253 Running Amperes A 0.12 Power Input W 16 -- Controls / Temperature Control Microprocessor / I.C. Thermister Control Unit Wireless Remote Control Unit Timer 24-Hour ON or OFF Timer, 1-Hour O
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Indoor Unit CS-KS18NB4UW & CZ-18BT1U <230V> Type Semi-Concealed Type Indoor Unit Voltage Rating 230V Single-Phase 60Hz Cooling Total Capacity BTU/h 17,500 kW 5.15 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 0.15 Power Input W 22 -- Controls / Temperature Control Microprocessor / I.C. Thermister Control Unit Wireless Remote Control Unit Timer 24-Hour ON or OFF Timer, 1-Hour
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Indoor Unit CS-KS18NB4UW & CZ-18BT1U <208V> Type Semi-Concealed Type Indoor Unit Voltage Rating 208V Single-Phase 60Hz Cooling Total Capacity BTU/h 17,500 kW 5.15 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 0.16 Power Input W 22 -- Controls / Temperature Control Microprocessor / I.C. Thermister Control Unit Wireless Remote Control Unit Timer 24-Hour ON or OFF Timer, 1-Hour
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2-2. Major Component Specifications 2-2-1. Indoor Unit Indoor Unit (Body) CS-MKS9NB4U Control PCB Part No. CB-CS-MKS9NB4U 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) 440 Rating Voltage / Nominal Output DC280V / 23W Coil Resistance Ohm - (Ambient Temp. 68 °F (20 °C)) Safety Device Type Internal Contr
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Indoor Unit (Body) CS-MKS12NB4U Control PCB Part No. CB-CS-MKS12NB4U 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 DC280V / 23W Coil Resistance Ohm - (Ambient Temp. 68 °F (20 °C)) Safety Device Type Thermal Fuse Over- Current Protection Yes Over- Heat Protection Yes Ru
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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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2-3. Other Component Specifications Indoor Unit CS-MKS9NB4U & CZ-18BT1U CS-MKS12NB4U & CZ-18BT1U CS-KS18NB4UW & CZ-18BT1U • Indoor air temp sensor • Indoor heat exchanger sensor (Model:KTEC-35-S98) (Model:PT2M-51H-S3) 10 200 9 180 8 160 7 140 6 120 5 100 4 80 3 60 2 40 1 20 0 0 50 59 68 77 86 95 104 32 50 68 86 104 122 140 158 176 194 (10) (15) (20) (25) (30) (35) (40) (0) (10) (20) (30) (40) (50) (60) (70) (80) (90) Temperature °F (°C) Temperature °F (°C) 17 Resistance (k ohm) Resistanc
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3. DIMENSIONAL DATA Indoor Unit CS-MKS9NB4U & CZ-18BT1U CS-MKS12NB4U & CZ-18BT1U CS-KS18NB4UW & CZ-18BT1U Unit : inch (mm) 18 A A 23-5/8 (600) Ceiling opening dimensions 21-1/32 (534) Suspension bolt pitch Air intake 1 Center of Discharge outlet 2 7 panel Refrigerant tubing (liquid tube) dia. 1/4" (flared) 3 Refrigerant tubing (gas tube) dia. 1/2" (flared) 8 4 4-29/32 5 Drain tube connection port VP20 (outer dia. 1") A View Power supply port 6 7 Suspension bolt hole (4 - 1/2" x 1-1/8" hole
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4. REFRIGERANT FLOW DIAGRAM 4-1. Refrigerant Flow Diagram Indoor Unit CS-MKS9NB4U & CZ-18BT1U CS-MKS12NB4U & CZ-18BT1U Indoor unit O.D. 3/8" (9.52 mm) O.D. 1/4" (6.35 mm) Cooling cycle Indoor Unit CS-KS18NB4UW & CZ-18BT1U Indoor unit O.D. 1/2" (12.7 mm) O.D. 1/4" (6.35 mm) Cooling cycle 19 Strainer Strainer Heat exchanger Heat exchanger
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5. ELECTRICAL DATA 5-1. Electric Wiring Diagrams Indoor Unit CS-MKS9NB4U & CZ-18BT1U CS-MKS12NB4U & CZ-18BT1U CS-KS18NB4UW & CZ-18BT1U 20 TO OUTDOOR UNIT 1 2 3 TERMINAL BASE FLAP (W) FLAP (R) IND LAMP ASSY 1 2 3 4 5 1 2 3 4 5 THERMISTOR 1 2 3 4 5 6 7 8 9 10 DRAIN PUMP 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 6 7 8 9 10 GND FAN MOTOR DP BRN FM RED ORG 1 2 3 4 5 6 YEL 1 2 3 4 5 6 PNK BLU VLT 1 2 3 4 5 6 1 3 1 2 3 4 5 6 7 1 2 3 4 5 6 7 1 2 3 4 1 2 3 4 5 6 7 1 2 3 4 5 1 3 1 2 1 2 1 2 3 4 5 6 1 3 1 2 3 4 5
